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Stainless steel has been successfully and widely used in a variety of marine environments, because in order to stainless steel in the seawater environment long-term corrosion resistance, the need for a very complex stainless steel processing technology. Austenitic stainless steels, martensitic stainless steels have long been used in the manufacture of navigational power units on superheater pipes and turbine blades. In addition, these stainless steels are also used to make large-capacity chemical containers on ocean-going vessels, and the use of these devices is sometimes different from the conditions used by the land chemical plant. Many grades of stainless steel can be used very well in marine environments, but different grades are sensitive to stress corrosion cracking. Martensitic stainless steel on behalf of 410 and ferrite stainless steel on behalf of 430, if in the marine environment, a few months time will rust. However, such uniform rust can be removed by mechanical grinding. The more popular stainless steel is austenitic stainless steel because the steel is more resistant to corrosion. But the time is too long, the same will be black. Also can be polished to remove these blacks. And the steel stainless steel in the water generally do not occur evenly rust, so do not worry too much. Stainless steel leaves The use of stainless steel in marine environment The stainless steel components in the propeller The marine vessel’s propeller can be made of cast stainless steel CF-8 (similar to 304 stainless steel). When the vessel stops sailing, from the propeller spindle through the bearing to the hull, constitute a conductive metal circuit. Cast stainless steel, similar to the chemical composition of 410 stainless steel, is also often selected as a propeller, and is also widely used in icebreakers. With the development of stainless steel technology, also has a compound austenitic – ferritic stainless steel 20Cr-8Ni-3.5Mo to cast large-scale propeller on the ocean wheel (weight 3000kg). Often in the port operations of the vessel, the propeller is vulnerable to the impact of debris on the sea and accelerated damage. So the austenitic stainless steel as raw material made of the propeller can be straightened or welded way to repair, so the material is to consider this aspect. Stainless steel components in the pump When the centrifugal pump operating environment is the ocean, such as the pump has a stainless steel components, equipment, the reliability will be significantly increased. Seawater CF-8M cast stainless steel impeller (similar to 316 stainless steel) and 316 stainless steel as the spindle, the reliability is very good. If the pump does not work, it is likely to be crevice corrosion and point corrosion. So you can use a more lively and rusty cast iron to make a considerable wall thickness of the pump, so cast iron in the downtime will have a cathodic protection of the pump. When the pump work, the cast iron box under the protection of the cathode will be able to make the next rust steel, but the flow of water to be cathodic protection. In addition to long-term work of the pump is best for seawater and fresh water, the use of different equipment. Bulk containers Stainless steel is also often made of bulk containers, such as liquefied natural gas (LNG), chemicals, beverages and so on. Generally use 304L stainless steel to make the shipment of LNG containers loaded, the purpose is not to corrosion but to pay attention to the low temperature of the stainless steel mechanical properties. The containers of marine chemicals generally take into account the corrosion resistance of stainless steel, which is contrary to the storage and transportation of terrestrial chemicals. If the vessel is an ordinary non-scheduled freighter, the container carrying the chemical can also carry other items such as acetic acid, bad pulp or xylene. Usually 316L stainless steel as raw material to make the valve, cargo pump, tube, heating coil and the container itself. The container can be made of stainless steel or made of carbon steel in a 0.06-0.08in (1.5-2.0mm) stainless steel plate. However, before use, be sure to carefully check the container stainless steel plate is defective and thorough cleaning and passivation treatment. Stainless steel components in heat exchangers Austenitic stainless steel pipes are now widely used in forced water circulation systems for coolers and power plant steam condensers, which are not suitable for use with copper alloy because of their high levels of contamination. 316 stainless steel is more appropriate to use. In the coastal and harbor areas, a large number of foreign agglomerates and sludge into the condenser pipe, very prone to serious obstacles, then we must take measures to exclude. A reasonable measure is to use a rubber ball to circulate through the pipe, because the rubber ball can produce squeeze to clean up the pipe wall. When the flow rate of seawater is about 1m / s, it can effectively prevent the inhalation of marine organic debris, so that the condenser pipe can not produce point corrosion. Unlike other alloys, the condenser duct made of stainless steel is not limited by the maximum flow rate but is related to the economic effect of the entire pump unit. O-ring Series-type electrical connectors and associated O-ring positioning devices are usually made of 304 or 316 stainless steel, especially marine and military engineering. This effect is very good. O-shaped seal can be through the hull, aluminum frame to be some factors to obtain cathodic protection. But once there is no cathodic protection, the O-ring is so bad (or even weeks) that it will lose its function because of crevice corrosion. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

We know that size of stainless steel lap joint stub end is not the same, in accordance with the stainless steel welding flanging unique place, we minimize the heat input, so we need to adopt the manual electric arc welding and argon arc welding of the two kinds of welding methods to deal with, then introduce stainless steel lap joint stub end welding requirements. ​ First of all, if by manual arc welding, then DC reverse, if you need to use the argon arc welding DC, we should remember these two kinds of connection; we must be in before welding wire for stainless steel wire brush to get rid of the oxide skin on the surface, while washing with acetone; if in argon the welding nozzle, the diameter of 2.5mm, tungsten tungsten bowl, with 2.5mm specifications; argon arc welding of stainless steel lap joint stub end, the back must be filled with argon protection, in order to ensure back forming. Using the method of local filling in the pipeline, the flow rate is 5-14L/min, the positive argon flow rate is 12-13L/min. To prevent the precipitation of carbide sensitization and intergranular corrosion, we need to strictly control the layer temperature and cooling rate after welding, welding interlayer temperature controlled at 60 DEG C, the welding must be carried out after the water treatment immediately, at the same time by welding, this stainless steel welding flange complete. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel reducer is made of malleable cast iron manufacturing, mainly used in water supply pipeline, gas pipeline, oil pipeline and pipe connection between. We often see the size of the stainless steel head is black, right Angle and camber, our production of stainless steel ring force reducer has the quality, wear resistance, not easy to damage characteristic. Our products are often widely used in petroleum, metallurgy, chemical industry, electric power industries such as pipeline equipment, installation and other services. Stainless steel reducer With the rapid development of domestic economy, the use of the product demand is higher and higher, a lot of customer value is more than the quality of the products and services, our goal is an advanced construction industry and shipping industry, stainless steel reducer is given priority to with connecting pipe fittings, in the field of the development of the product can bear responsibility, has the international first-class technical level and set sail. Stainless steel reducer fittings processing technology has a certain technology, according to certain technology to production in the production: First, double conformity, joint pipe bending deformation by external force when won’t impact the sealing ring, stainless steel reducer fittings type connection of technical performance, technical indicators, the upgrade of the technical level of the products; Second, double conformity of 1.8 times higher than that of single pushing press-fitting, suitable for high-rise buildings, high water pressure; Third, double the viega profi-press aprons seal within the stainless steel material, the durability of aprons, and the double conformity of sealing ring around squeezed even and seal not times water out from the side, make up for a lack of applicable in the process of single conformity. Stainless steel reducer, therefore, to win customer’s favor, would have to pay special attention to the quality, improve service, earnestly implement every technological process, let the size of the stainless steel head can better service for mankind. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel reducer in reducing deformation in the process of suppression and hole enlargement, according to different materials and variable diameter pipe fittings we need to deal with, and then also need determination by cold pressing and hot pressing, under normal circumstances, as far as possible by cold pressing, but the multiple variable diameter caused by the severe strain hardening, the thick or wall thickness of alloy steel material appropriate USES hot pressing. Stainless steel reducer of the hole diameter molding process is to use less than the size of the big end diameter tube billet, used in die forming along the tube billet diameter hole enlargement, variable diameter hole enlargement process mainly solved the reducer not easy through reducing forming, sometimes according to the requirements of the materials and products forming, expanding and reducing method of combination. Stainless steel reducer’s reducing molding process is will and head big end diameter equal to the size of the pipe into the forming mould, then along the pipe axis suppression, shrink along the cavity movement and metal forming, finally completes the reducer’s reducing process. Because the size of the stainless steel reducer with heating after pressing tee, reduce material forming required equipment tonnage. Hot-pressing tee with wider adaptability of materials used for low carbon steel, alloy steel, stainless steel materials; Form of a process. Besides using steel as raw material to produce the reducer, the size of the specifications of department head can also be used steel plate stamping forming technology is adopted to improve the yield. Used by stretching die appearance reference stainless steel inner surface size reducer design, use after blanking punching die, stamping steel stretch forming. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel reducer production is mainly by suppressing is given priority to, however, according to many years experience, to suppress this kind of method can make the hardness and density change, just now if not heated, it will be very easy to produce cracks, therefore, many manufacturers and beat my brains (out). Actually, we only need to be control of variable diameter range, in general, a processing stainless steel reducer range within level, for example, the size of the 325-129 reducer, need after several times of the heat treatment, you need to take 325 tubes to suppress a head, the aperture of the compressed into 325, 273, after the pressing needs after heating, the second variable diameter is 273 variable diameter 219 process, this time also need the tube heated to the specified temperature, then pressed, then the process of variable diameter 219 into 219, every variable diameter is needed after heat treatment. Each will have their own material hardness and tensile strength characteristics, due to these characteristics it is destined to each kind of material suppression strength are not the same, the same type of stainless steel reducer, the material is different processing methods and procedures will also vary widely, ordinary carbon steel heat treatment after three times the size of the head will be forming, that’s the number of the size of the alloy material hardness, the greater the head pressing and heating will have, the more the number of forming process can be more complicated. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel reducer in the annealing time must pay attention to detail, a good grasp of the time. First, we must check the sealing performance of the furnace body, bright annealing furnace should be closed, and must be isolated from the outside air; also need to use hydrogen as a protective gas, only one exhaust port is connected. We can use soapy water wipe in the annealing furnace of each joint, to see if there is gas leakage phenomenon; the need to look at the place where is the annealing furnace into the pipe and pipe out of place, because the seals of this place is particularly easy to wear, so we need to constantly check and regular replacement. Second, we want to protect the furnace pressure, to prevent leakage, furnace protection should be to maintain a certain gas pressure, if the protection of gas is hydrogen, then the general need to reach more than 20kBr. Third, check whether the annealing temperature reaches the specified temperature, stainless steel heat treatment is generally taken solution heat treatment, is what we often say “annealing”, the general need to control the temperature range at 1040~1120 DEG C, stainless steel reducer in the annealing zone should be incandescent state, but there is no softening droop. So here we must control the temperature, pay more attention to observation, so as to be able to produce the perfect product. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

The molding technology of the stainless steel reducer: first of all we need to welding a cross section of polygon edges ring shell or blockade on both ends of multi sector, such as internal pressure medium, full of pressure and internal pressure under the action of cross section of polygonal gradually became round, finally became a circular ring shell, Reducer of the material is special, in certain areas show different use value, to some extent, affects the development of other industries, so we are manufacture must pay attention to detail, to ensure product quality. Special application performance: reducer using the unique properties of rubber, high elasticity, high air tightness, for example, medium resistance and radiation, high strength, after high temperature, high temperature moulding crosslinking, internal density is high, can bear high pressure, the elastic deformation effect is excellent. Stainless steel reducer’s end arc high product structure design, curve length, has a large number of displacement function, especially used in complex geological conditions, sedimentation rate and cold heat changes in the operation of the pipeline are pipeline damage, reducer using the elastic sliding displacement and deformation of the rubber mechanical force of heat dissipation function effectively eliminate the pump, valve and pipe displacement of its own physical damage. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Surface protection of stainless steel dished head Note: 1, not in the open air storage, anti-rain;   2, to prevent the surface of the stainless steel dished head bumps scratch;   3, to avoid forced welding. Structural design to prevent binding force is too large;   4, dished head and cylinder group welding, the timely clean-up weld, around the welding slag and other parts, for PT inspection and surface pickling;   5, to prevent contact with carbon steel to avoid iron-ion pollution;   6, stainless steel pickling can not use hydrochloric acid to reduce acid; For oCr18Ni9 and 304 metastable austenitic stainless steel dished head is easy due to improper surface protection, and cause surface pitting. When superimposed with the processing stress, the ultimate stress of the non-staple food and intergranular non-staple food. Note the use of stainless steel dished head: 1, carbon steel dished head in the nitric acid, nitrogen, alkaline sodium and other environmental cracks, please specify the end of the order to eliminate the residual pressure.   2, Austenitic stainless steel chloride ions in a specific environment, the occurrence of stress corrosion cracking, please select the appropriate material in the design;   3, Aluminized carbon steel containers, please heat treatment to remove residual stress. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

The corrosion resistance of alloy elements on the stainless steel cross in steel containing chromium, is made of stainless steel four basic elements of corrosion resistance of steel, when the chromium content reaches about 1.2%, the oxygen effect of chromium and erosion medium, to form a thin film on the surface of steel (self passivation film). The matrix can prevent further erosion of steel. Stainless steel cross with different production processes and processes, in the process of production and processing according to a certain situation, the different nature of the stainless steel crosses in the process of processing need to pay attention to some matters. Stainless steel cross has a certain corrosion resistance (oxidizing acid, organic acid, cavitation), heat and wear resistance. Usually used in power station, chemical, petroleum and other equipment materials. The welding of stainless steel cross is poor, should pay attention to the welding process, heat treatment conditions and the selection of the appropriate electrode. After the hardening of the larger, easy to produce cracks. If the same type of electrode welding, must be more than 300 degrees above the preheating and welding of 700 degrees after the slow cooling treatment. If the welding parts can not be heat treatment after welding, should use the chromium nickel stainless steel welding rod. 1, the workpiece using static load for correction, generally should not be local percussion. 2, the correction should be carried out after the annealing temperature below the original tempering temperature. 3, austenitic stainless steel cross parts, after correction at 300 degrees Celsius to stress treatment. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel cross is a kind of made by stainless steel pipe fittings, the fittings is pided into four interfaces, and is generally such as diameter, of course, in some cases there is also a reducing, such as the diameter of the stainless steel cross is connected the same size of the pipe body, reducing the different diameter of the pipe body is link. The branch over size less than competent to take over the size. The product is mainly used in pipe branch. In the industry have a four-way called seamless tube manufacturing, the product is hydraulic expansion and extrusion forming of stainless steel cross. There are several reasons for the crack on the surface of stainless steel cross: A, processing is too large, in an empty pipe, tube billet by external force for the drawing force, mould wall of the pipe to the positive pressure and friction. Affected by friction, the metal deformation in the process of flow, the outer surface layer along the longitudinal flow more slowly than the inner layer, so as to make the outer metal is attached gallas stress, while the inner metal under compression stress. Processing is larger, difference of inner and outer layer of metal flow rate, the greater the outer metal are attached with William gallas, the greater the stress, the more prone to crack. After drawing, the additional stress disappear, the pipe will produce elastic recovery, the inner metal has a tendency to longitudinal extension, and the outer metal has a tendency to shorten, but the shrinkage of the outer metal is limited by the inner metal, the extension of the inner metal also is limited by the outer layer of metal, so that the outer metal by residual tensile stress, the corresponding inner metal by residual compressive stress. The outer metal by residual tensile stress, is stainless steel cross pipe crack appeared in the process of drawing in place after the main root cause. In lining pipes, due to the two aspects of mandrel and die wall friction and the effect of tube bloom inside and outside surface layer metal flow velocity is slower than the middle layer velocity, so as to make the internal and external surface metal by gallas attached stress at the same time, when the wall is thin, the metal plasticity is poorer, more prone to crack. At the end of the drawing, the products of the residual stress of pipe inside and outside surface residual tensile stress, residual compressive stress by the middle tier. Due to internal and external surface metal by residual tensile stress at the same time, therefore, line pull thin wall tube in the process of placing more prone to crack. Two, has deep horizontal tube billet surface scratch. If the pipe outside surface has the deep transverse scratch, will generate stress concentration, whether it is in the process of drawing, or drawing after placement process, are prone to crack. Three, the pipe annealing is not sufficient. If the pipe annealing is not fully, can appear the endogenous cooked outside. The internal and external surface strength is low, easy to deformation, and the middle layer high strength stainless steel cross’s pipe wall, it is not easy to deformation. Because in the process of drawing tube billet cross-section along the longitudinal deformation of the metal flow is uneven, the intensity distribution of non-uniform deformation have been intensified inhomogeneity, so as to make the easy occurrence crack defects in drawing process. Everyone in the process of using it is important to note that the above said the problem, as far as possible to reduce the damage of the products, to avoid unnecessary waste. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Seamless steel pipe is a kind of hollow cross-section, there is no seam around the long steel. Seamless steel pipe with hollow cross-section, a large number of pipes used to transport fluid, such as the transportation of oil, natural gas, gas, water and certain solid materials such as pipes. Seamless steel and round steel and other solid steel, the same bending strength in the bending, the lighter weight, is an economic section of steel, is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, car drive shaft , Bicycle frames and steel scaffolds used in construction. Seamless steel pipe manufacturing ring parts, can improve material utilization, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jackets, etc., has been widely used to manufacture seamless steel pipe. Seamless steel pipe or a variety of conventional weapons indispensable materials, barrel, barrel, etc. to be seamless steel pipe to manufacture. Seamless steel pipe according to the different cross-sectional shape can be pided into round tube and shaped tube. Because the circle area is the largest under circum- stances of equal length, more fluid can be delivered with a circular tube. In addition, the circular cross-section to withstand internal or external radial pressure, the force is more uniform, so the vast majority of seamless steel pipe is a round tube. However, the tube also has some limitations, such as bending in the plane by the conditions, the tube is not as square, rectangular tube bending strength, a number of farm machinery with skeleton, Gangmu furniture on the common side, rectangular tube. According to different uses need to have other cross-section shape of the shaped seamless steel pipe. 1. Structure seamless steel pipe (GB / T8162-1999) is used for general structure and mechanical structure seamless steel pipe. 2. seamless steel pipe for fluid transport (GB / T8163-1999) is used to transport water, oil, gas and other fluids in general seamless steel pipe. 3. Low and medium-pressure boiler seamless steel pipe (GB3087-1999) is used to manufacture a variety of low and medium pressure boiler superheated steam pipe, boiling water pipes and locomotive boiler superheated steam pipe, smoke pipe, small pipe and Arch brick with high-quality carbon structural steel hot-rolled and cold drawn (rolling) seamless steel pipe. 4. High-pressure boiler seamless steel pipe (GB5310-1995) is used to manufacture high pressure and above pressure water pipe boiler heating surface with high-quality carbon steel, alloy steel and stainless steel heat-resistant seamless steel pipe. 5. High-pressure seamless steel pipe for fertilizer equipment (GB6479-86) is applicable to the working temperature of -40 ~ 400 ℃, working pressure of 10 ~ 30Ma chemical equipment and piping high-quality carbon structural steel and alloy steel seamless steel pipe.  6. seamless steel pipe for oil cracking (GB9948-88) is applicable to the oil refinery furnace tubes, heat exchangers and seamless pipe.  7. Seamless steel pipe for geological drilling (YB235-70) is a seamless steel pipe used for core drilling in the geological department. It can be pided into drill pipe, drill collar, core pipe, casing and sediment pipe etc.  8. seamless steel pipe for diamond core drilling (GB3423-82) is used for diamond core drilling of the drill pipe, core rod, casing seamless steel pipe.  9. Oil drilling pipe (YB528-65) is used for oil drilling both ends of the thickening or thickening of seamless steel pipe. Seamless tube sub-car wire and not car wire two, car thread tube connection with the joint, not the wire with the butt welding method and tool joints.  10. Seamless carbon steel pipe (GB5213-85) is the manufacture of ships Class I pressure pipe, Ⅱ pressure pipe, boiler and superheater with seamless carbon steel pipe. Seamless carbon steel pipe wall temperature does not exceed 450 ℃, seamless steel pipe operating temperature of more than 450 ℃.  11. seamless Steel Tube for Automotive Axle Bushings (GB3088-82) is a hot-rolled seamless steel tube with high quality carbon structural steel and alloy structural steel for automobile shaft axle casing and axle axle housing axle tube.  12. Diesel engine with high-pressure tubing (GB3093-86) is the manufacture of diesel injection system for high-pressure cold drawn seamless steel pipe.  13. Hydraulic and pneumatic cylinder with precision seamless steel pipe diameter (GB8713-88) is the manufacture of hydraulic and pneumatic cylinder with precision diameter diameter cold-drawn or cold-rolled precision seamless steel pipe.  14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) is used for mechanical structure, hydraulic equipment, high dimensional accuracy and good surface finish cold drawn or cold-rolled precision seamless steel pipe. Precision seamless steel pipe manufacturing machinery or hydraulic equipment, can greatly save machining time, improve material utilization, while helping to improve product quality.  15. Structure stainless steel seamless pipe (GB / T14975-1994) is widely used in chemical, petroleum, textile, medical, food, machinery and other industries corrosion-resistant pipes and structural parts and parts made of stainless steel heat Rolling (extrusion, expansion) and cold drawing (rolling) seamless steel pipe.  16. seamless steel pipe for fluid transportation (GB / T14976-1994) is a hot-rolled (extruded, expanded) and cold drawn seamless steel pipe made of stainless steel for conveying fluids.  17. Shaped seamless Steel Tube is a general term for seamless steel tubes other than round tubes. Seamless steel pipe according to the different shape and size can be pided into different thickness seamless steel pipe (code-D), ranging from different thickness seamless steel pipe (code-named BD), variable diameter seamless Seam steel pipe (code-named BJ). Shaped seamless steel pipe is widely used in a variety of structural parts, tools and mechanical parts. Compared with the tube, shaped pipe generally have a larger moment of inertia and section modulus, a greater bending and torsion resistance, can greatly reduce the weight of the structure, saving steel. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Pipe cap: welding on the pipe end or installed outside the pipe thread to cover wall pipe fittings. Use closed pipeline, function the same as the tube wall. This kind of pipe cap for pipeline provides a partition, so they don’t spread to the outside world, the harmful material in pipeline is pipeline construction safety, the most powerful, personnel safety is the most effective protection. In a transport of dangerous substances, there should be more than one partition, to ensure that hazardous substance can’t be released due to the leak of one of the dangerous. That is to say, the pipe cap in the pipe system is not only one, but there are a lot of, can ensure the security defense work. In daily life, often appear due to the negligence of construction personnel, forget to put back the pipe cap to pipeline after completing a job, thereby causing serious consequences, toxic, flammable, harmful substances will follow the open pipe of the air to the outside world, pose threat to people’s life safety. In the face of this situation, we have to double in the construction of more careful. Sometimes due to the needs of work, often will drain pipe, drainage pipe to pipe and so on in pipe cap removed, but after work is done, it is important to ensure that all unloaded pipe cap products to restore to the original position, the work is completed. In daily inspection of pipeline, also want to carefully check the pipeline pipe cap, to see if it has damaged and missing, if there is a problem, it is necessary to change in time, in order to ensure the safety of the pipeline. In the pipeline, to find those prone to leak, easy to cause the material or pressure release dangerous places, these places for double protection, can increase the number of pipe cap, accordingly strengthen the effect of partition. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)