Search Results

What Is a Loose Flange? ​ A loose flange (lap joint flange) is a device that is welded onto the end of a piece of pipe to create half of a flanged coupling. Consisting of a flat steel forging with bolt holes around the perimeter and an opening in the center the size of the pipe that is intended to be welded onto the loose flange, the component can be made of carbon steel or stainless steel to meet the intended application. There are loose flange types to fit elbows, valves and nearly every type of pipeline component in use. Due to the nature of pipelines, the connections and couplings can rarely be constructed in advance. The use of a loose flange allows a worker to create a coupling in any location along the pipeline that is feasible. The worker simply cuts the pipe at the required location and places a loose flange onto the end of the pipe. After carefully preparing the pipe to weld, the loose flange is welded permanently to the end of the pipe. If a valve or elbow is required, the worker simply welds the flange onto the elbow or valve as well as the pipe, and the union is made. Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a “Lap Joint Stub End”. These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End. Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges. They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End). Lap Joint flanges have certain special advantages: Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes. Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe. In systems which erode or corrode quickly, the flanges may be salvaged for re-use. what is the advantage of the lap joint flange? 1. Because of the structure of a Lap joing flange ,  it can swivel around the stub end and pipe lining. When the piping system is assembe and disassemble frequently,  it is better to use a Lap joint flange. It means the flange can work even the two flanges bolt holes are misalignment . 2. In a corrosive situation,  the flange joints need to be exchange very soon. To a lap joint flange, only the stub end is touch with the pipe and fluid , the backing flange no need to touch it .  It means you could only replace the stub end , no need to replace the backing flange , so the lap joint flange can decrease the cost of the piping systems. 3.The backing flange and the stub end is seperated , so we can use two different materials for the two pieces.  it can work for  more complicated application. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

The high frequency vibration of high pressure piping has strict requirements on the assembly of the lens gasket of the high pressure flange. Before the assembly should be inside pipeline, pipe threaded end and tapered sealing surface, gaskets, high pressure flange and bolts, nuts and all the clean up, and check the appearance, when necessary, then coloring, magnetic or ultrasonic flaw detection. Any seals shall have crack; surface defects, which the pipe threaded end, high pressure flange, bolt and nut thread of the effective part of tooth high corrosion and wear shall not exceed 10% of the standard tooth height, each lap mechanical damage length should not be more than 1 / 5 of the perimeter, each circle and not larger than the circumference of a circle, bolt rod section shall not corrosion or mechanical damage; overproofed defects should be replaced in a timely manner. In the assembly process, attention should be paid to maintain a clean sealing surface, and strictly control the bolt of flange preload, the hydraulic tightening device or measuring torque wrench symmetric fastening. Stud bolt tightening after the elongation control in general is not more than 3 / 10 000 bolt length, high temperature control between the 3 / 10 000 ~ 5 / 10 000 bolt length, bolt ends exposed outside the nut thread length should be equal as far as possible and not less than 2 times the pitch, to remove more than twice the bolt pre tightening force of around 6% increase. Installation shall not use forced assembly and a requirement to keep two flanges parallel to the end surface, the parallel deviation control within 0.3mm, keep the two flanges on the axial center line of the coaxial, coaxiality error depending on the diameter size control in less than 0.3 ~ 0.5mm range, to really confidential cover good contact and prevent bad moment. Keep a good surrounding environment, do a good job of dampproof, dustproof and anti rust and other maintenance work, and according to the working temperature of the level of discretion in the high pressure bolt coated powder lubricating oil or grease molybdenum disulfide. Pipeline running at high temperatures, the general should be in keeping the temperature test operation 24h after, tube pressure relief to 0.5MPa (gauge) following then moderate fastening force will flange bolts in hot tight to seal the pretightening force; pipeline running at low temperatures, in keeping the temperature test operation 24h after unloading despite internal pressure and with methanol on the surface of the bolts of flanges. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Due to the site of the arrival of the The wall thickness of elbow exceeds bid badly, need to be done according to the actual measurement of pipeline stress calculation, the calculation of wall thickness to exceed bid, pipes, pipe stress on device interface thrust and torque is qualified, and whether to set up reasonable pipe rack. In the pipeline stress calculation procedures, bend the wall thickness of the default for the connection pipe wall thickness, calculating the stress strengthening coefficient of elbow and flexible coefficient. To accounting need to select the wall thickness of the pipe connected to the elbow. By the weight of the elbow to convert in this wall thickness, the bend along the centerline and diameter into a straight pipe (straight pipe length equals the bend axis length), the weight unfolds the straight pipe and elbow weight is consistent, the straight tube wall thickness for the bend in the form of weight reduced wall thickness. The elbow convert of calculated thickness back to piping stress calculation model, can be bend the impact on the pipeline after the wall thickness of paint. 1. The stress influence of the pipes The wall thickness of elbow change before and after the pipe elbow in a stress and secondary stress calculation results. Elbow bend wall thickness increase after a stress most showed a trend of decrease, and the secondary stress showed a trend of increase, but a change of stress and secondary stress were not more than 20%. According to the specification, in the case of not consider accidental loading, a stress piping shall be conducted by the pipe pressure, gravity and other continuous load. Internal pressure is constant, there is no external load cases, the increase of thickness, stress strengthening coefficient decreases, and will cause the bend of a lower stress. Inpidual point due to the elbow wall weight increase, reduce the impact of the offset the stress strengthening coefficient, makes a stress rose slightly. And in the absence of other secondary stress under the influence of cyclic loading is mainly caused by thermal expansion the joint torque generated in the cross section. As a result of the The wall thickness of elbow increases, the bend of the flexible coefficient K value is reduced, makes on the cross section of torque increase, so the secondary stress will increase. 2. The effects on thrust torque device interface The wall thickness of elbow change push pipe of equipment interface of thrust and torque changes, pipe of high the influence of interface are discussed here. By the calculation results can be seen that as a result of the The wall thickness of elbow increased, under the thermal state of resultant force and torque will increase, the biggest increase of 52.18%, the smallest is 14.76%. The reason is due to the changes of bend flexible coefficient. Flexible coefficient said bent pipe relative to the straight pipe under the bending moment increase flexible degree, its value is equal to the same deformation conditions, in accordance with the general and the bending moment and bending theory considering the bent pipe cross section to calculate the bending moment of the ratio of flat effect. 3. The impact on pipe, lifting point load After The wall thickness of elbow change, in the piping of lifting point loading will change too. By the calculation results can be seen that elastic bearing point of the steam extraction pipeline hot rate reached 15%, and drain piping hot load change rate is not more than 5%, the difference is mainly due to the different piping within the medium. Due to the drain pipe medium is water, bend weight is small, the proportion in the whole piping weight change not for piping lifting point load is too big change. But medium for steam of the steam extraction pipeline, density is small, elbow weight is bigger, the proportion in piping wall thickness change, will cause the tube department bearing load must be changed. But no matter how to load variation, spring support in terms of piping size spring jump phenomenon happens. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

What is butt welding mean? The strategy of butt welding is often a welding joint.When butt welding, material together two parts in a single lines are parallel over the edge.Butt welded joints can be produced with a large continuous or portable welding machine operation.Butt welded joint is surely an economical and reliable technique of joining materials without any additional components. In wilsonpipeline.Com, a lot of butt welding joints in our products. 1.Our main pipe fittings products are butt welding pipe fittings products, their ends are plain end or bevel end for butt welding connection.  2.Large size pipe fittings products are produced from steel plate, they are welded in body, not seamless.Those pipe fittings are produced in butt welding method. 3.The weld neck flange, when a weld neck flange is welded to the pipes, the welding joint is butt welding. 4.Piping prefabrication, for such fabrication products, when we design it, we perfer to use joints of butt welding method. Because butt welding joints is very strong and secure for materials. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Welding to choose the right welding material. The chemical composition of the wire has an important effect on the corrosion resistance of the weld. The electrode should have a chemical composition similar to that of the base metal. This allows the weld metal to have a similar chemical composition to the base metal and is generally considered to be the best Corrosion resistance. Stainless steel welding characteristics As the resistance coefficient of stainless steel is much larger than the low-carbon steel, welding and welding of the base metal are more likely to be heated lead to melting, will melt around the base overheating, making the welding zone deformation and grain coarsening. Stainless steel linear expansion coefficient, and the thermal conductivity of small, easy to transfer heat, and welding depth of penetration, welding heat will cause the expansion of the structure, there are relatively large cooling shrinkage and tensile stress, easy to cause thermal cracking. After the welding of stainless steel, it is easy to cause intergranular corrosion in the heat affected zone. Because in the heat affected zone, at the sensitization temperature (450 ℃ -850 ℃) interval, the substrate is partially poor chromium, it is difficult to passivation, resulting in corrosion resistance was significantly reduced, so will be the first corrosion, stainless steel grain boundary corrosion width. At this point the corrosion of stainless steel parts of the plasticity and strength has been seriously missing, there will be cracks in the cold bend, brittle fracture, corrosion of metal parts floor landing sound. Precautions against welding of stainless steel Control welding current The current magnitude of the welding stainless steel is smaller than the low carbon steel, the current capacity is about 80% of the low carbon steel. Speed ​​up the welding speed Welding speed to be faster, thus reducing the width of the heat affected zone, shortening the weld in the sensible temperature range of residence time, so that the weld in a stable state, and refine the weld structure. Reasonable selection of welding materials Select the appropriate welding material and shielding gas. As the chemical composition of the wire will significantly affect the corrosion resistance of the weld, so the chemical composition of the electrode should be similar with the base metal, which will help the weld show the best corrosion resistance. Welding before and after cleaning The surface of the material must be cleaned before welding and the weld residue removed after welding. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Because stainless steel pipe fitting is their condition in a number of different joint made to work, and so has to pick a suitable pipe fitting type, to get the very best usage of join performance. Mainly reflected inside the characteristics of pipe fitting types, namely, the development of the liquid leaving the pipe of the shape as well as its operating performance. pipe selection factors flow, pressure, liquid angle, coverage, impact, temperature, materials, applications, and the factors in many cases are implicated the other, mutual restraint. The stainless steel pipe fitting you can pick: metal grease fitting material should be in line with the chemical properties with the bath to discover: 1, for non-corrosive bath in accordance with the futility of processing, the use of alloy steel pipe fitting 2, to avoid corrosion, stainless steel pipe fitting can be utilized 3, sulfuric acid, hydrochloric acid and also other strong corrosive bath, may be seamless pipe fitting 4, to the phosphate bath pipe materials frequently used acid-resistant stainless steel 5, to stop corrosion from the pipe fitting can even be directly created from metal or nylon production. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Since its inception in the early 20th century, with the continuous development of its research and development and production technology, the standard of stainless steel has been gradually established in various industrialized countries, and the establishment and perfection of stainless steel standard has promoted the progress of stainless steel production technology. Raw Materials Stainless steels are made of some of the basic elements found in the earth: iron ore, chromium, silicon, nickel, carbon, nitrogen, and manganese. Properties of the final alloy are tailored by varying the amounts of these elements. Nitrogen, for instance, improves tensile properties like ductility. It also improves corrosion resistance, which makes it valuable for use in duplex stainless steels. The Manufacturing Process The manufacture of stainless steel involves a series of processes. First, the steel is melted, and then it is cast into solid form. After various forming steps, the steel is heat treated and then cleaned and polished to give it the desired finish. Next, it is packaged and sent to manufacturers, who weld and join the steel to produce the desired shapes. Melting and casting 1 The raw materials are first melted together in an electric furnace. This step usually requires 8 to 12 hours of intense heat. When the melting is finished, the molten steel is cast into semi-finished forms. These include blooms (rectangular shapes), billets (round or square shapes 1.5 inches or 3.8 centimeters in thickness), slabs, rods, and tube rounds. Forming 2 Next, the semi-finished steel goes through forming operations, beginning with hot rolling, in which the steel is heated and passed through huge rolls. Blooms and billets are formed into bar and wire, while slabs are formed into plate, strip, and sheet. Bars are available in all grades and come in rounds, squares, octagons, or hexagons 0.25 inch (.63 centimeter) in size. Wire is usually available up to 0.5 inch (1.27 centimeters) in diameter or size. Plate is more than 0.1875 inch (.47 centimeter) thick and over 10 inches (25.4 centimeters) wide. Strip is less than 0.185 inch (.47 centimeter) thick and less than 24 inches (61 centimeters) wide. Sheet is less than 0.1875 (.47 centimeter) thick and more than 24 (61 centimeters) wide. Heat treatment 3 After the stainless steel is formed, most types must go through an annealing step. Annealing is a heat treatment in which the steel is heated and cooled under controlled conditions to relieve internal stresses and soften the metal. Some steels are heat treated for higher strength. However, such a heat treatment—also known as age hardening —requires careful control, for even small changes from the recommended temperature, time, or cooling rate can seriously affect the properties. Lower aging temperatures produce high strength with low fracture toughness, while higher-temperature aging produces a lower strength, tougher material. Though the heating rate to reach the aging temperature (900 to 1000 degrees Fahrenheit or 482 to 537 degrees Celsius) does not effect the properties, the cooling rate does. A post-aging quenching (rapid cooling) treatment can increase the toughness without a significant loss in strength. One such process involves water quenching the material in a 35-degree Fahrenheit (1.6-degree Celsius) ice-water bath for a minimum of two hours. The type of heat treatment depends on the type of steel; in other words, whether it is austenitic, ferritic, or martensitic. Austenitic steels are heated to above 1900 degrees Fahrenheit (1037 degrees Celsius) for a time depending on the thickness. Water quenching is used for thick sections, whereas air cooling or air blasting is used for thin sections. If cooled too slowly, carbide precipitation can occur. This buildup can be eliminated by thermal stabilization. In this method, the steel is held for several hours at 1500 to 1600 degrees Fahrenheit (815 to 871 degrees Celsius). Cleaning part surfaces of contaminants before heat treatment is sometimes also necessary to achieve proper heat treatment. Descaling 4 Annealing causes a scale or build-up to form on the steel. The scale can be removed using several processes. One of the most common methods, pickling, uses a nitric-hydrofluoric acid bath to descale the steel. In another method, electrocleaning, an electric current is applied to the surface using a cathode and phosphoric acid, and the scale is removed. The annealing and descaling steps occur at different stages depending on the type of steel being worked. Bar and wire, for instance, go through further forming steps (more hot rolling, forging, or extruding) after the initial hot rolling before being annealed and descaled. Sheet and strip, on the other hand, go through an initial annealing and descaling step immediately after hot rolling. After cold rolling (passing through rolls at a relatively low temperature), which produces a further reduction in thickness, sheet and strip are annealed and descaled again. A final cold rolling step then prepares the steel for final processing. Cutting 5 Cutting operations are usually necessary to obtain the desired blank shape or size to trim the part to final size. Mechanical cutting is accomplished by a variety of methods, including straight shearing using guillotine knives, circle shearing using circular knives horizontally and vertically positioned, sawing using high speed steel blades, blanking, and nibbling. Blanking uses metal punches and dies to punch out the shape by shearing. Nibbling is a process of cutting by blanking out a series of overlapping holes and is ideally suited for irregular shapes. Stainless steel can also be cut using flame cutting, which involves a flame-fired torch using oxygen and propane in conjunction with iron powder. This method is clean and fast. Another cutting method is known as plasma jet cutting, in which an ionized gas column in conjunction with an electric arc through a small orifice makes the cut. The gas produces extremely high temperatures to melt the metal. Finishing 6 Surface finish is an important specification for stainless steel products and is critical in applications where appearance is also important. Certain surface finishes also make stainless steel easier to clean, which is obviously important for sanitary applications. A smooth surface as obtained by polishing also provides better corrosion resistance. On the other hand, rough finishes are often required for lubrication applications, as well as to facilitate further manufacturing steps. Surface finishes are the result of processes used in fabricating the various forms or are the result of further processing. There are a variety of methods used for finishing. A dull finish is produced by hot rolling, annealing, and descaling. A bright finish is obtained by first hot rolling and then cold rolling on polished rolls. A highly reflective finish is produced by cold rolling in combination with annealing in a controlled atmosphere furnace, by grinding with abrasives, or by buffing a finely ground surface. A mirror finish is produced by polishing with progressively finer abrasives, followed by extensive buffing. For grinding or polishing, grinding wheels or abrasive belts are normally used. Buffing uses cloth wheels in combination with cutting compounds containing very fine abrasive particles in bar or stick forms. Other finishing methods include tumbling, which forces movement of a tumbling material against surfaces of parts, dry etching (sandblasting), wet etching using acid solutions, and surface dulling. The latter uses sandblasting, wire brushing, or pickling techniques. The Smelting process of stainless steel production First to introduce the basic principles of stainless steel smelting. Stainless steel contains at least 10.5% Cr, which is different from carbon steel production. Therefore, in the decarburization reaction, reaction occurs: Cr3O4 + 4 [C] = 3 [Cr] + 4CO Reaction equilibrium constant Cr in the high chromium steel, Cr than C priority oxidation, in the normal smelting temperature, C below 0.03%, the balance of Cr is only about 4%; improve the temperature can improve the balance of Cr content, but refractory unbearable. Such as: 18% Cr of molten steel, the temperature to reach more than 1900 ℃, for the development of a partial pressure of CO to reduce the smelting method. Stainless steel commonly used refining methods: AOD, VOD, K-OBM-S, K-BOP and so on), RH-BMP method and so on, which can be used in the process of arc furnace, direct arc melting, AOD, VOD, OB method, in which the AOD method, VOD method dominant. Through the use of two-step and three-step process to produce smelting stainless steel, can produce large-scale low-carbon, ultra-low carbon stainless steel, but also can improve the recovery of Cr. 1) Several smelting methods of stainless steel: One step: EAF Original Electric Furnace Direct Production Process Two-step method: EAF + AOD EAF + VOD EAF + CLU LD-OB + VOD Three steps: EAF + K-OBM-S + VOD or AOD + (LF) EAF + AOD + VOD EAF + LD-OB + VOD 2) The advantages and disadvantages of AOD and VOD: AOD smelting has the advantages of low investment cost, high decarburization speed and high production efficiency, high thermal efficiency and low cost of smelting. It has good stirring effect and is easy to de-S and O. The equipment is relatively simple and the process is easy to grasp. AOD around the use of stainless steel production, the disadvantage is the production of low C, N steel difficult. VOD smelting off C, Cr-effective, good deoxidation effect; suitable for the production of low C, N steel and so on. Shortcomings High investment costs, equipment maintenance difficulties. The process hot rolling of stainless steel The strip accounts for about 70% of the total output of stainless steel. Stainless steel hot strip mainly by the hot rolling mill, steckel mill and other production, including hot rolling mill, which is characterized by large output, low cost, good quality, is widely used in many steel mills. However, the number of stainless steels produced by the improved Steckel Mill in the world is increasing, such as AVESTA and YUSCO. Heavy plate generally by the four-roll reversing mill-based production. The cold rolling process of Stainless steel Stainless steel is a high alloy steel, rolling deformation resistance, in order to carry out high-efficiency, high-precision rolling, rigidity should be used in large rolling mill, generally multi-roll cold rolling mill. The heat treatment process of stainless steel Stainless steel heat treatment through the use of the best performance, or create conditions for subsequent processing, the general stainless steel in the factory before the need for heat treatment. Martensitic stainless steel: softening (martensite → ferrite + carbide); carbide diffusion; degree. Ferritic stainless steel: to improve plasticity; adjust the grain size. Austenitic stainless steel: Carbide solid solution; Adjust grain size; Soften; Reduce δ ferrite. Duplex stainless steel: carbide solid solution; improve plasticity; reduce the brittle phase precipitation. The common standard of stainless steel Since its inception in the early 20th century, with the continuous development of its research and development and production technology, its standards are gradually established in the industrialized countries, the establishment and perfection of stainless steel standards, in turn, to promote the progress of stainless steel production technology, Promote the improvement of product quality, the development of stainless steel products in the market trade, play a very important role. China National (GB / T) standards: Hot – rolled stainless steel sheets and strip GB / T Cold – rolled stainless steel sheets and strips GB / T Heat – resisting steel plates and strips GB / T GB / T1220 stainless steel rods GB / T8165 stainless steel composite plate and strip Stainless steel and heat – resistant steel, designation and chemical composition GB / T Other special stainless steel standards, as well as the enterprise standards Commonly used foreign standard (international common standard): ASTM A240 (M) stainless steel plate (American Standard) ASME A 240 (M) Stainless Steel Plate (American Standard) ASTM A 480 (M) Stainless Steel Plate (American Standard) JIS4305 stainless steel cold rolled steel sheet (Japanese standard) JIS4304 stainless steel hot-rolled steel sheet (Japanese standard) EN10028 Stainless steel for pressure vessels (EU) EN10088 General purpose sheets, plates and strips with stainless steel (EU) Other European EN series standards

The forged pipe fittings are mean that pipes are through the technology of forging.Commonly the forged pipe fittings includes:socket weld pipe fittings and threaded pipe fittings. Forged Pipe Fittings Standard: We supply forged pipe fittings according to GB/T14383,SH3410,ASME B16.11,BS3799 and Custom-made.We supply a variety of forged pipe fittings to satisfy our customers’ specific requirements. Our products are produced strictly according to the required standard. Forged Pipe Fittings Size: wilsonpipeline supplies forged pipe fittings Dimension DN6-DN100.It has all kinds of size.They are generally small size.We can according to the size of production.In forging the purpose of each size is different.The customer wants to type can be booked. Forged Pipe Fittings Pressure: We under the pressure of production in 3000/6000/9000/10000 PSI.The PSI’s English is full of Pounds per square inch,which said the pressure of the forged pipe fittings. Forged Pipe Fittings Material: The forged pipe fittings could be Carbon Steel,Stainless Steel,Alloy Steel,20#,A105,20Mn,A350LF2,ASTM A182 F5,F9,F11,F12,F22,F91,F304L,F316L,F321,F347,F51. wilsonpipeline is mainly producing forged pipe fittings and other products in China.We supply a variety of pipe fittings to satisfy our customers’ specific requirements. Welcome to contact us when you have any need about all kinds of forged pipe fittings.

Stainless steel angle bar is widely used in a variety of stainless steel profiles, with structural stability, corrosion resistance, deformation resistance, chemical stability and so on. Relative to other metal materials, profiles, with unparalleled advantages. Definition of the name of Stainless steel angle bar Stainless steel angle bar generally refers to the stainless steel material, both sides at right angles to the long steel. According to the length of the edge is pided into equilateral Stainless steel angle bar and Stainless steel angle bar. Equal width of the two sides is equal to the angle of stainless steel. The common manufacturing of stainless steel of Stainless steel angle bar Stainless steel angle bar can be classified according to the material, the common martensitic stainless steel, ferritic stainless steel, duplex stainless steel, austenitic stainless steel and precipitation hardening stainless steel and so on. 1. Austenitic stainless steel Such material production and consumption accounted for the mainstream position of the product, accounting for 70.1% of the total stainless steel. Is a very important category in stainless steel. In accordance with the ratio of alloys, austenitic stainless steel can be pided into chrome-nickel steel and iron-chromium-manganese steel two categories. The former to nickel for the austenitic elements, is the main body of austenitic steel, taking into account the cost of production, which is based on manganese, nitrogen instead of expensive nickel section nickel steel. Austenitic steel has good corrosion resistance, good mechanical properties and process performance, but the strength, hardness performance is weak. 2. Ferritic stainless steel Ferritic stainless steel containing chromium 11% -30%, the basic non-nickel, is a nickel-plated steel, in the use of the structure to ferrite-based. The ferritic stainless steel has higher strength, and cold work hardening tendency is low, resistance to chloride stress corrosion, pitting corrosion, crevice corrosion and other local corrosion performance, but sensitive to intergranular corrosion, low temperature toughness is poor. 3. Duplex stainless steel Traditionally, there is more than 15% ferrite in the austenitic matrix. On the other hand, austenite + ferrite duplex stainless steels with more than 15% austenite in the ferrite matrix can be called. Duplex stainless steels combine the advantages of both austenitic and ferritic steels. 4. Martensitic stainless steel Martensitic stainless steel is a kind of heat treatment can be used to adjust its performance of steel, its strength, hardness is high. Precipitation hardening of stainless steel is by means of heat treatment to precipitate carbide precipitation, so as to achieve the purpose of enhancing the strength of steel. The above are common for the production of Stainless steel angle bar material. In addition, the above material is also widely used in the production of other forms of profiles, plates, pipes and so on. Standard Specification for Common Stainless steel angle bars 1. Dimension representation When we see this statement: “∠ 30 × 30 × 3”, which means the edge width of 30 mm, edge thickness of 3 mm Stainless steel angle bar of the equilateral. This is expressed in millimeters in width, width, and thickness. 2. Model representation Model is the width of the cm, such as ∠ 3 #. The model can not be said that the same type of thick side of the different product information, and thus buyers and sellers in the custom contract, or the need to Stainless steel angle bar side edge width, thick side fill in complete size, rather than using a separate model, in order to avoid ambiguity, resulting dispute. The current common domestic Stainless steel angle bar specifications for the 2 to 20, to the side length of cm number, the same number angle of about 2-7 different edge thickness. While imports of Stainless steel angle bar marked on both sides of the actual size and edge thickness and indicate the relevant standards. Generally large Stainless steel angle bar side length 12.5cm above, 12.5cm-5cm between the medium-sized Stainless steel angle bar, side length of 5cm for small Stainless steel angle bar. Delivery length of Stainless steel angle bar In addition to the thickness of the edge to indicate the angle of stainless steel products, in the actual trading process, but also in accordance with the length of product orders. To meet the needs of different application scenarios. Stainless steel angle bar of delivery length of sub-length, double the length of two kinds of domestic Stainless steel angle bar of the length of the selection range according to the specifications of the different 3-9m, 4-12m, 4-19m, 6-19m four range. Japanese-made Stainless steel angle bar of choice for the length of 6-15m. The height of the cross-section of the unequal-sided Stainless steel angle bar is calculated by the long side width of the unequal-angle Stainless steel angle bar. Appearance quality requirements for Stainless steel angle bar Stainless steel angle bar generally do not require the use of harmful defects, such as stratification, scarring, cracks and so on. Surface quality in the standard have specific provisions, Stainless steel angle bar angle deviation of the geometry of the allowable range is also provided in the standard, generally including the curvature, edge width, edge thickness, the angle of the theoretical weight, and provides Stainless steel angle bar, Stainless steel angle bar There shall be no significant reversal. Common Uses for Stainless steel angle bars Stainless steel angle bar is widely used in all kinds of building structure and engineering structure, from the civil beam, and storage shelves, equipment rack base to industrial bridges, transmission towers, lifting transport machinery, and even military ships, industrial furnaces, Reaction tower, container rack. According to the different needs of the structure composed of a variety of force components, but also for the connection between the components. Stainless steel angle bar compared to other materials (such as angle iron), the material properties unparalleled. But the cost is high, not all occasions will be used Stainless steel angle bar to build. Appendix: Common Stainless steel angle bar material and specifications Stainless steel angle bar Spot Material: 201,202,301,302,304 (0Cr18Ni9), 304L (00Cr19Ni10), 316 (0Cr17Ni12Mo2), 316L (00Cr17Ni14Mo2), 309S (0Cr23Ni13), 310S (0Cr25Ni20), 321 (1Cr18Ni9Ti), 410S 1Cr13), 420J1 (2Cr13), 430 (1Cr17), 317, 347, 403, 405, 409L.

The application of butt welding pipe fittings:

A butt welding pipe fitting means the pipe fitting which has the connecting end for butt welding.Commonly the butt welding pipe fitting products includes elbows,tees,reducers, caps,paddles,stub ends,crosses,hot induction bends.The butt welding pipe fitting products are widely used in Industry field,like Oil,Gas & Petrochemical,Energy & Power plant,Chemical industrial,Shipbuilding & Offshore Development. Our butt welding pipe fittings products commonly according to standard ANSI/ASME B16.9 and ANSI/ASME B16.28,there are other standards about butt welding pipe fittings such as:EN 10253,DIN,JIS,MSS SP-43,MSS SP-75,GOST.We also manufacture the butt welding pipe fittings as per client’s requirements.The butt welding pipe fitting tolerance within the scope of the following: Butt Welding Pipe Fitting General: Cross-sectional tolerances for all butt welding pipe fittings (ASME/ANSI B16.9 and B16.28): Alignment tolerances are concerned with the way that the ends of a fitting are cut. Exaggerated distortions are shown for clarity in the diagram below. Alignment tolerances (ASME/ANSI B16.9 and B16.28): Tolerances for Specific Fittings Dimensional tolerances for elbows and returns (ASME/ANSI B16.9 and B16.28): Dimensional tolerances for reducers, caps and stub ends (ASME/ANSI B16.9): wilsonpipeline manufacture forged pipe fittings,pipe flanges,steel pipes according to international standards or customer’s requirements.If you have any requirements about the butt welding pipe fittings, welcome to contact us. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Large flange in assembly welding. To avoid in the condition of bearing or bearing welds, try to eliminate the influence of external forces of weld bead and prevent deformation of the flange. Take the following measures: (1) when conditions permit, the horizontal barrel level in roller frame assembly welding flange. After welding flange in the mouth of the first welding flanges outside the mouth. Welding current and voltage shoulds not be too big, in order to reduce the accumulation of heat. (2) when necessary, can give the flange stiffened plates equipped with process closed to resist deformation trend. Stiffened plates removed after welding process. And the welding scar left by the bridge polishing. (3) when the cylinder is in vertical position assembly welding equipment flange, should try to support cylinder, the flange in a suspended state, giving the function of weld bead is not affected by tube weight force. (4) if necessary, can be used on the bolts in the flange fixed another companion flange, then the normal assembly welding flange. After welding to remove companion flange. In short, as long as the welding process to take appropriate measures before four, even if again big, again weak flange can also ensure that will not happen deformation during welding. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)