Search Results

Hydrogen sulfide corrosion resistant pipeline steel mainly used to manufacture and transport sour gas pipeline. With the improvement of the delivery pressure and reduce the gas from the viewpoint of the cost of desulfurization, sometimes without desulfurization of the gas pipeline circumstances, so that such pipelines have to use the pipeline corrosion resistance to hydrogen sulfide. Hydrogen sulfide corrosion resistant steel for oil pipeline  and gas pipeline is the most difficult to produce a type of steel, because of its purity of molten steel, billet segregation controls and controlled rolling and cooling requirements of high traditional metallurgical processes can not meet the requirements . Usually in the acid gas environment, pipeline failure reasons are two: one is the sulfide stress corrosion cracking, referred to SSC. The defect is in the high strength steel surface and the internal stress and hydrogen sulfide corrosion under the action of the medium together with the stress direction perpendicular wall cracks. In the pipeline in service process, the high-grade steel pipeline prone to SSC. Another one is hydrogen induced cracking, referred to HIC. The cracks due to the high concentration of hydrogen sulfide gas environment into the steel corrosion inside the hydrogen produced in the vicinity of inclusions and segregation resulting enrichment of the surface parallel to the wall cracking. HIC occurs mainly in low-, medium-strength steel planted.

Problems in the processing of stainless steel welded pipe products 3.1 weld defects: weld defects are more serious, the use of manual mechanical polishing processing method to make up, resulting in the grinding marks, resulting in uneven surface, affecting the appearance. 3.2 the surface is not consistent: only for the welding of pickling passivation, but also cause the surface is not uniform, affecting the appearance. 3.3 scratch difficult to remove: pickling and passivation for overall, nor will remove scratches produced in the machining process, and can not be removed due to scratching, welding spatter and adhesion of impurities in the surface of stainless steel carbon steel, welding spatter, resulting in corrosion medium under chemical corrosion and electrochemical corrosion and rust. 3.4 polishing and passivation is not uniform: after polishing and passivation treatment, the area of the larger workpiece, it is difficult to achieve uniform treatment effect, can not get the ideal uniform surface. And man hour cost, auxiliary material cost is also high. 3.5 pickling capacity is limited: acid pickling passivation cream is not a panacea, the plasma cutting, flame cutting and production and black oxide skin, more difficult to remove. Scratch the 3.6 caused by human factors more serious: in lifting, transportation and processing process, bump, procrastination, hammer et al caused by scratching is more serious, making the surface processing more difficult, but also after the treatment of corrosion of the main reason. 3.7 equipment factors: in profiles, sheet metal bending, bending process, caused by scratching and crease is produced after corrosion. 3.8 other factors: stainless steel raw materials in the procurement, storage process, due to the lifting and transport process of bump and scratch is also more serious, also produce one of the cause of corrosion. 4 preventive measures should be taken 4.1 storage, lifting and transportation 4.1.1 stainless steel welded pipe storage: should have special storage rack, storage rack should be wood or surface painted carbon steel stent or pad with a rubber pad, and carbon steel and other metal materials. Storage, storage location should be easy to lift and transport, and other materials storage area relatively isolated, there should be protective measures, in order to avoid the pollution of dust, oil and rust on the stainless steel. 4.1.2 stainless steel welded pipe hoisting: when lifting, should use special sling, such as lifting belt, special clip etc., prohibited the use of wire rope so as not to scratch the surface; and placed in lifting and should be avoid shock bump caused by scratching. 4.1.3 stainless steel welded pipe transport: transport, application of means of transport (such as car, storage battery car) and should be clean isolation protection measures to prevent dust, oil, rust pollution stainless steel. No drag, avoid the bump and scratch. 4.2 processing 4.2.1 processing area: stainless steel welded pipe processing area should be relatively fixed. Stainless steel parts processing area of the platform should take isolation measures, such as laying on the rubber pad, etc.. Location management, stainless steel pipe processing zone civilized production should be strengthened, in order to avoid the damage and pollution of stainless steel. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel profile of equal tee Stainless steel equal tee is commonly professional nouns, tee for pipe fittings, pipe fittings, to branch pipe used in the main line. Equal tee is a tee, tee has generally equal tee, reducing tee. Named because of the three terminal can be connected to the pipe. The application of stainless steel equal tee Stainless steel equal tee is widely used in petrochemical, oil and natural gas, liquefied gas, fertilizer, power plant, nuclear power, shipbuilding, papermaking, pharmaceutical, food sanitation, urban construction industries of engineering construction and maintenance. Industry higher requirements for this kind of pipe pressure, maximum pressure can reach 600 kg, life water pressure is low, the general is 16 kg. The classification of the stainless steel equal tee Because equal tee can be used in a variety of industries, with different types can be pided into the following categories: 1. The material pided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon luo drain, PPC, etc. 2. By producing method can be pided into the system, pressing, forging, casting, etc. 3. To make standard classification can be pided into the national standard, the electric standard, water standard, American standard, Germany standard, Japanese standard, the standard and so on. Equal tee is on both ends of the same diameter, branch pipe diameter and the other two different called a reducing tee, said method is as follows: for equal tee, such as “T3” said three general principles of the outer diameter is 3 inches equal tee. For reducing tee, such as “T4 x 4 x 3.5” said with diameter of 4 inches 3.5 inches diameter reducing tee. Material generally is 10 # # 20 A3 Q235A 20 g 20 g 16 mn ASTM A234 ASTM A105 ASTM A403, tee, outer diameter range in 60 “2.5”, from 26 “60” for welding tee. Wall thickness of 28-60 mm. Pressure rating for Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

The defects of mild steel pipe under a reducing atmosphere or in a vacuum protection, after high temperature solid melting and rapid cooling to get the stainless steel tube, requiring the inner surface has a very good surface roughness and cleanliness, is a comprehensive consideration of organizational stability corrosion resistance and workability of the pipe. The defects of mild steel pipe are following below Scarring One of the steel surface defects, the performance of the product surface scar-like foil. Often has tongue, block or scaly and irregular distribution. Scarring sizes, shades ranging from below often inclusions. Rolling scarring resulting scar is called rolling, the distribution location, shape and size substantially the same, there are many defects in the oxide skin beneath. General metallurgical products surface does not allow scarring. White spot In the acid leaching of transverse specimens showed white dots of varying sizes of internal defects. White irregular shape, smooth and slightly raised, mostly in the central part of a larger size and high alloy content rolled and forgings. The reason is that the chemical composition of white uneven segregation and aggregation of certain alloying elements. It is not easy to corrosion due to defects in the acid leaching appear as white spots on the specimen. Approach is adopted to prevent leukoplakia refining, argon stirring to evenly ingredients, using ingot casting technology or control the cooling rate to prevent fluid analysis. Pipe lamination Structural separation of large organizations present on the metal substrate, is an internal defect metal plastic processing products. Separating surface parallel to the processing surface, the longitudinal and cross sections showed a long crack, there is a small amount of non-metallic inclusions in the cracks and segregation, destroy the integrity of the metal substrate. Stratification is due to shrinkage, the crack, bubble plastic processing defects by extending, elongated, and failed weld formation. Hair crack One of the steel surface defects, the performance of the product surface hairy lines. Shorter than shallow cracks along the rolling direction dispersed or in clusters. Hairline is the product generally allow defects, but its depth should comply with the relevant standards. Banded orientation One flaw in the steel, hot rolled low carbon steel in the microstructure, are arranged in parallel along the rolling direction, a layered distribution of ferrite and pearlite grains grain just like strip. This is due to occur in the steel during cooling after hot rolling in the ferrite by the priority and non-metallic inclusions dendritic segregation strip extending from the formation, resulting in the formation of ferrite strips, strips of ferrite phase transformation between pearlite, the two phases into the layer distribution. So the presence of the band structure of the uneven structure of the steel and the impact properties of the steel, the formation anisotropy, lower ductility of steel, and reduction in toughness, resulting in undesirable cold bending, stamping scrap rate, easy deformation during the heat treatment of steel adverse consequences. Surface defects In steel and non-ferrous alloy material surface and affect the quality of products of various flaws in general. Many types of surface defects, mostly in the morphology of the defect to name, and some of its causes named. Production processes often to produce defective products surface defects into two categories. One is steel bad defects, such as separation, scarring, crack, crack, hairline, bubbles, etc. Most of these defects are caused due to poor quality of the ingot. Another flaw is poor machining operations, including folding, ears, pitting, convex hull, scratches, dents, pressed into the oxide scale, burrs, etc., these defects are generated in the process of plastic plus. Burr One of the steel surface defects, manifested as cold cuts, hot saw steel ends are missing or flame cutting burr, when extruded pipe welds have excess metal. Cold cut products depends on the thickness of the ends burr gap between the blade. General product to allow a certain degree of glitches exist; But inside and outside burr pipe must be scraped off.

Structural steel pipe in its wall thickness, good materials, processing technology and stability, becoming the first choice for large domestic and foreign oil and gas pipe project. In the large-straight seam welded steel pipe joint structure, weld and heat affected zone is the easiest place to produce a variety of defects, and weld undercut, pores, slag, lack of fusion, lack of penetration, weld, burn, weld cracking is the main form of welding defects, and are often the cause structural steel quality accidents origin. Structural steel quality control measures include: Prior to welding quality control 1. Make a good quality of raw materials, after passing inspection before being officially entered the construction site, and resolutely put an end to the use of substandard steel.  2, Followed by the management of welding materials. Check whether the welding materials for qualified products, storage and baking system if implemented, whether to issue a welding material surface clean and free of rust, electrode coating is intact, with or without mildew.  3, Welding area clean management. Clean quality inspection weld zone, without water, oil, rust and dirt oxide film, which is to prevent external weld defects produce important role.  4, Select the appropriate welding method should be implemented first test welding, after welding principles. Quality control in the welding process 1, According to welding procedure specifications wire and flux review is correct, prevent misuse wire and flux caused by welding quality accident.  2, The welding environment supervision, take appropriate measures after welding when welding environment is not good (temperature below 0 ℃, relative humidity greater than 90%) should be.  3, Before the expected first test weld groove dimensions, including space, blunt edge, the angle and the wrong mouth, etc. meets the process requirements. 4, Inside and outside the submerged arc welding process chosen welding current, welding voltage, welding speed and other parameters are correct. 5. Supervise staff in the submerged arc welding inside and outside the welding arc full advantage of steel tube end plate length, straight seam steel strengthen the efficiency of the welding arc when the inner and outer plates, which helps to improve the quality of welding the pipe ends.  6, Supervise welding personnel in the welding slag clean whether first, whether the joint has been completely processed, whether the groove of the oil, rust, slag, water, paint and other contaminants.

Mild steel pipe (MS pipe), the carbon content from 0.10 to 0.30% low carbon steel easy to accept all kinds of processing such as forging, welding and cutting, commonly used in the manufacture of chains, rivets, bolts, shafts, etc. Carbon content less than 0.25% of carbon steel, because of its low strength, low hardness and soft, so called soft steel. It includes most of the part of ordinary carbon steel and high quality carbon structural steel, mostly without heat treatment for engineering structures, some carburizing heat treatment used to require abrasion and other mechanical parts. Usually rolled into a low-carbon steel angles, channels, beams, steel pipes, steel or steel, used to make various building components, containers, tank, furnace and other farm machinery. High quality low carbon steel rolled into sheets, production automobile cab, engine hood and other deep drawn products; also rolled into bars, used to produce strength less demanding mechanical parts. Before use generally mild steel without heat treatment, the carbon content of 0.15% or more by carburizing or cyanide treatment, for applications requiring high surface temperature, wear good shafts, bushings, sprockets and other parts. As low strength low carbon steel, use is restricted. Appropriate increase in carbon manganese content, and add trace vanadium, titanium, niobium and other alloying elements, can greatly improve the strength of steel. If the lower carbon content and adding a small amount of aluminum, boron, and a small amount of carbide forming elements, you can get ultra-low carbon bainite its strength is high enough, and keep the good ductility and toughness. Cast steel pipe is pipe with casting. Cast steel pipe is for water supply, drainage and gas pipelines, which includes cast straight pipe and fittings. Labor intensity. By casting methods, it is pided into continuous cast steel pipe and centrifugal cast steel pipe, cast steel pipe which is pided into centrifugal sand and metal type. Material pided into gray cast steel pipe and ductile steel pipe. Different forms at the interface is pided into flexible interface, flange interface, self-anchored interfaces, rigid interface. Among them, flexible cast steel pipe rubber ring seal; cast steel pipe flange mounting flange interface, padded rubber flange gasket; rigid cast steel pipe socket interface is generally larger, straight tube inserted, sealed with cement, this process is now basically eliminated. Difference between mild steel pipe and cast steel pipe First, different materials, cast steel pipe is made ​​of ductile iron, mild steel pipe is made ​​of structural steel, the main ingredient is low carbon. Second, different manufacturing process, cast steel pipe is generally sand casting; mild steel pipe is used through the mill rolled billet molding or submerged arc welding, resistance welding together. Third, different performance, cast steel pipe generally large diameter, tube wall thickness, crisp texture, relatively heavy, which can be made of carbon steel of very small diameter, thin wall, good toughness, light. Uses are different. Fourth, different usage life, cast steel pipe is a high-speed centrifuge cast iron pipe, it is resistant to stress corrosion life of 70 years or more, usually do the city’s underground water gas pipelines. Mild steel pipe is welded steel coil, it’s a simple process, but the life expectancy of 20-30 years or so, the price is quite and milling of cast steel pipes.

1, The types of flanges according to the national norm: integral flange, threaded flange, weld neck flange, with flat welding neck flange, Socket Weld neck flange, butt welding band neck loose flange, plate, Slip on flange, butt welding plate loose flange rings, flat welding ring plate loose flange, flange ring plate loose flange, flange cover. 2, The types of flanges according to the chemical industry norm: integral flange (IF), threaded flange (Th), plate flat welding flange diameter (PL), with butt welding flange (WN), with flat welding neck flange, socket welding flange (SO) (SW), the butt welding ring loose flange (PJ/SE), flat welding ring loose tube flange (PJ/RJ), lining flange cover (BL (S)), flange cover (BL). 3, The types of flanges according to the petrochemical industry norm: threaded flange (PT), weld neck flange (WN), Slip on flange (SO), Socket Weld flange (SW), loose flange (LJ), flange cover (not table). Slip on flange of steel, is suitable for the nominal pressure of not more than 2.5 MPa carbon steel pipe connection. Slip on flange sealing surface can be made into smooth type, concave and convex type and mortise type 3 kinds. Smooth and Slip on flange are the largest. In the condition of medium is more moderate cases, such as suit low circulating water, the purification of compressed air, and it has the advantage of the price is cheaper; Weld neck flange: suit for flange and pipe welding, its structure is reasonable, the strength and stiffness is bigger, can withstand high temperature and high pressure curve and temperature fluctuation, and repeated the sealing is reliable. Nominal pressure of 0.25 ~ 2.5 MPa weld neck flange with concave and convex type sealing surface. Socket Weld flange: often used in PN acuities were 10.0 MPa, DN acuities were 40 pipeline; Flange, flange come loose flange, commonly known as loop points welding ring flange, flange flanging live live flange and butt weld ends. Often used in medium temperature and pressure is not high and strong corrosion conditions. When strong corrosive medium, part of the flange contact medium (flanging nipple) as the corrosion resistance of high grade materials such as stainless steel materials, while the external use of low grade materials such as carbon steel material of flange ring clamp it in order to realize the seal; Integral flange: often the flange and the equipment, pipes, pipe fittings, valves, etc, this type of commonly used on the equipment and valves. Sealing surface forms: plane (FF), DCS (RF), convex (M), convex (F), concave and convex surface (MF) and groove (T) groove surface (G), grooved surface (TG), RTJ (RJ). Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Reducer is used for pipe diameter changes in a pipe. Usually adopted for reducing the forming process of pressing, expanding to suppress or reducing and expanding, to certain specifications of the reducer and stamping can be applied. A. reducing/expanding forming reducing forming technology of reducer is will be equal and reducer big end diameter of tube rounds into the forming mould, pass along the axial direction of tube billet, shrink along the cavity movement and metal forming. According to the size of the reducer, pided into the one of pressing or more press forming. Below for reducing the forming ofconcentric reducer. Forming hole diameter is less than reducer big end diameter of the tube billet, used in die forming along the tube billet diameter hole enlargement. Hole enlargement technology mainly to solve the reducer in the variable diameter is larger not easily by reducing forming, sometimes according to the requirements of the materials and products forming, expanding and reducing method of combination. In the process of reducing or expanding deformation, according to different materials and variable diameter, determination by cold pressing and hot pressing. Under normal circumstances, as far as possible by cold pressing, but the multiple variable diameter and cause serious work hardening of the thick or alloy steel, wall thickness of materials appropriate USES hot pressing. B. stamping In addition to the use of steel tube as raw material to produce reducer, the part of the specifications of the reducer can also be used steel plate stamping forming technology is adopted to improve the production. Drawing die shapes used by reference to reducing tube surface size design, use after blanking punching die, stamping steel stretch forming. The stress distribution and deformation characteristics: 1) the inner pressure function similarly hereinafter heart reducer an area about the size of the pressure difference between the bending moment caused by big end is relatively open, small end relative shrinkage phenomenon; 2)inner pressure under the action of eccentric reducer central eccentric side inside the big end surface and eccentric side to the outer ring stress is the largest. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

A pipe clamp is a type of clamp often employed in woodworking, piping or cabinet shops. When referring to woodwork or cabinet shops, pipe clamps are usually composed of commercially manufactured clamp heads or “jaws” and a length of common threaded pipe. The capacity of the clamp is determined by the length of the pipe used. When referring to piping, pipe clamps are used to connect the pipe to the pipe hanger assembly. An on board to guide rails can be welded on the foundation, or with screws, then push the inside rail nut orbit and turn 90 degrees and the lower half of the body embedded tube clamp nut, put the need fixed pipe, add the upper half of the pipe clip body and cover with screws. Light series pipe clamps applied six kinds of dimension series ordinary mechanical pressure pipe, pipe diameter 6-57mm. Double contact tube clamp applied five sizes series mechanical pressure pipes, pipe diameter 6-42mm. Heavy series pipe clamps applied to eight kinds of size series of high mechanical pressure pipe, pipe diameter 8-273 mm. Mounting plate assembly before welding, to better determine the direction of the folder, it is recommended to do the marking in a fixed place, after welding, welding, pipe clamps fitted on the lower half of the body, put the tube need fixing. Put on another half pipe clamp body and the cover screwed tight. Avoid direct soldering has been installed floor pipe clamps. Stacked assembly can be welded rail on the basis of, or screws, first with the upper and lower half of the pipe clamp body, need to put on a fixed pipe and put on half pipe clamp body, with screws through the locking plate to prevent it from turning.  Then install a second tube clip, as above. Bend the assembly, the assembly elbow, should be directly in front and rear elbow pipe clamp with Insein. Such recommendations should be fixed bearing point position.

Reducing flange is typically special processing, reducing flange connection pipe, is to make the pipe and pipe connected parts. Flange pipe fitting, flanged pipe fittings) refers to the pipe with flange. It can be made of casting and become, also can be made up of threaded connection or welding. Gasket seal between the flange, flange hole, two flange bolt that tight even. In the chemical pipeline pipe, generally use reducer to variable diameter (size), so economic, simple and convenient, but with reducer after welding, is not conducive to pipeline disassembling. Reducing flange processing and manufacturing, such as flange cover (blind flange) middle hole or homemade, etc., according to the flange standard using lathe for example can be DN80 flange hole open, open into (inner hole and manufacturing, according to DN80 flat flange to decrease the size of inside diameter and processing, and then with the flange DN80 matching use, used for pipe diameter changes, this kind of variable diameter connection, generally applicable to small pipe flow to the large pipe. Another reducing flange, each with a flange, both ends of two head flange size is different, is a big flange is small flange, a pipe is among, appearance as wearing a butt welding neck flange and a flat flange, the flange can be integral forging, also can be welded. Reducing flange is a kind of disc parts, reducing flange connection is an important connection mode of pipeline construction. The most common in the pipeline engineering, reducing flange are used in pairs. Reducing flange connection is two pipe pipe fittings and equipment, low pressure pipe flange diameter can use silk, the use of medium pressure welding flange diameter. Their first fixed on a flange diameter, between the two flange diameter, and reducing flange gasket, bolt, then the different pressure reducing flange bolts with different thickness and use different, completed the connection. In pipeline engineering, water pumps and valves of the equipment locally, also made the corresponding adapter flange shape, also known as reducing flange connection. Reducing flange Manufacturing standards: according to the customers’ construction drawings to production, there is no relevant national standards. Production process: forging manufacturing, whole forging, cutting system, the plate medium plate rolling, etc. Finish turning processing method: ordinary lathe, high precision CNC lathe car, argon arc welding, etc Material: stainless steel 304 (0 cr18ni9). 304 L, 321.316.316 l. 202. Carbon steel A3. A105.20 #. Q235, etc USES: widely used in pipe fittings, chemical industry, petroleum, electric power, power stations, water conservancy, industry, pressure vessel etc Characteristics: corrosion resistance, acid and alkali resistant, long service life and so on, the surface is smooth, acid and alkali resistant high temperature resistance, good appearance, texture performance is strong. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Residual magnetism causes and impact on quality of welding in the construction and repair of gas pipelines welding job, sometimes magnetic blow phenomena affect the welding process. Forming a magnetic blow is the result of the presence of residual magnetism of the tube metal. Typically, magnetic sensors and magnetic remanence is pided into two processes. Magnetic induction pipe in the plant often produces links, such as: metal smelting, electromagnetic crane handling, steel parked in a strong magnetic field, magnetization complete non-destructive inspection method, steel supply line near the strong place, and so on. The magnetic assembly processes often produce during welding operations and the use of magnetic holder, fixture and took direct current welding pipes, such as: prolonged contact is connected to a DC power supply electric wire, bare wire segment, or short-circuit pipe welding clamp and the like. When welding with magnetic steel, often see the difficulties arc ignition, combustion undermine the stability of the arc, the arc deviation, liquid metal and slag melt from the weld pool spills in a magnetic field. In order to stabilize the welding process, to improve the quality of welded joints, magnetized steel before welding to be demagnetized. It should be noted, the steel pipe to be welded is difficult to achieve full demagnetization.  So, when the remanence is insufficient to affect the quality of welding, it allows welding. Degaussing process of steel pipes For degaussing before welding, we developed a single steel pipe and steel pipe butt at the degaussing process, including the following: 1. Determine the pipe size and orientation of the magnetic field left; 2. Select the degaussing method, system diagrams and technical means; 3. Use the selected method of degaussing butt welded steel pipe or at degaussing; 4. Check after remanence after degaussing, to see if it meets the requirements.

The material of stainless steel elbow, usually on the basis of the carbon steel elbow increased the proportion of Cr, Ni alloy, such as content ratio can reach more than 20%. Common steel grade are: 304、 304 L、 321、 316、 316 L、 1 cr18ni9ti、 0 cr18ni9, its chemical composition can keep the elbow surface for a long time will not rust, does not corrode. 2. The characteristics of the stainless steel elbow, stainless steel elbow strength higher than that of carbon steel elbow, toughness is better than carbon steel elbow, stainless steel elbow corrosion resistance is strong. So in the chemical industry, papermaking and places of strong corrosive must use the stainless steel elbow, instead of using the carbon steel elbow. Due to the nature of the stainless steel elbow, the cost is also high in use. As aviation, aerospace, petroleum, chemical industry, metallurgy and food industry of booming development, such as stainless steel materials has been widely used, and the stainless steel stamping elbow materials because of the great toughness, high strength, low thermal conductivity, heat cutting large plastic deformation, the strain hardening, cutting heat, heat dissipation problem more severe, causing elbow high cutting temperature, cutting blade severe adhesion, easy to produce the devolop tumor, exacerbating the stainless steel stamping elbow wear and tear, and the processing surface coarse degree. Stainless steel stamping elbow the geometric Angle of cutting department, for the stainless steel stamping elbow machining yield rate, cutting tool costs, processed surface coarse degree, cutting force and work hardening etc all have great influence, reasonable choice and improve the efficiency of cutting tool geometry parameter is to guarantee the processing quality and progress, the effective ways to reduce capital. The choice of cutting tool materials Accurate selection of cutting tool materials is to ensure efficient processing of stainless steel stamping elbow determinants. According to characteristics of the cutting of the stainless steel stamping elbow, cutting tool material should have sufficient strength, high toughness, high hardness and wear resistance and stainless steel stamping elbow adhesion. Commonly used cutting tool materials have cemented carbide and high-speed steel two kinds big, complex shape of the cutter adopts high speed steel material. Because of the high speed steel cutting stainless steel stamping elbow when cutting speed cannot too tall, thus affect the progress of the production efficiency. For a simple tool cutting tool, cutting tool material should choose high strength, good thermal conductivity carbide, because of its hardness, wear resistance function is better than that of hot pressing elbow. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)