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Specialized in producing precision stainless steel pipes for 30 years

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What role does the stainless steel seamless tube solid solution treatment

Solid solution temperature first decided based on chemical composition. Generally speaking, high content of alloy elements and trademark, the solid solution temperature to progress accordingly.

The specification and appearance quality of the stainless steel pipe

The specification and appearance quality of the stainless steel pipe

1. According to the stainless steel seamless steel tube GB14975-94, stainless steel tube length (indefinite feet) hot-rolled steel pipe usually 1.5 ~ 10 m, hot extrusion stainless steel pipe is equal to and greater than 1 m. Cold drawing (rolling) stainless steel tube wall thickness 0.5 ~ 1.0 mm, 1.0 ~ 7 m; Wall thickness greater than 1.0 mm, 1.0 ~ 8 m. 2, the diameter of the hot rolled (hot extrusion) stainless steel pipe 54 to 480 a total of 45 mm; The wall thickness of 4.5 a total of 36 ~ 45 mm. The diameter of the cold drawing (rolling) stainless steel rod on a total of 65 ~ 200 mm; A total of 39 wall thickness 0.5 ~ 21 mm. 3, stainless steel tube inside and outside surface must not have crack, folded, crack, crack, rolling, delamination and scar defects exist, these defects shall be completely removed (except for machining tube), remove after more than negative deviation may not make the wall thickness and diameter. Whoever does not exceed the permitted other minor surface defects can not remove negative deviation. 4, straight to allow depth. Hot rolled stainless steel tube, hot extrusion, less than and equal to 140 mm diameter is not more than 5% of nominal wall thickness, maximum depth is not greater than 0.5 mm; Cold drawing (rolling) stainless steel pipe is not more than 4% of nominal wall thickness, maximum depth is not greater than 0.3 mm. 5, stainless steel pipe ends shall be cut at right angles, and remove burrs. TypeInfo: Wonderful Wuxi Precision Steel Pipe Keywords for the information:

The hardness of seamless steel tube inspection tools

The hardness of seamless steel tube inspection tools

The inner diameter of the seamless steel tube above 6.0 mm, 13 mm thickness in the following annealing seamless steel pipe, can be used W - type B75 Webster hardness tester, test is very quick, easy, it is suitable for the seamless steel pipe to do fast nondestructive inspection qualified. Seamless steel pipe diameter greater than 30 mm, wall thickness of seamless steel tube is greater than 1.2 mm, using rockwell hardness tester, HRB, HRC hardness test. Seamless steel tube diameter greater than 30 mm, wall thickness less than 1.2 mm of seamless steel tube, using surface rockwell hardness tester, HRT or HRN hardness test. Is greater than 4.8 mm in diameter less than 0 mm, seamless steel pipe, pipe use special rockwell hardness tester, testing HR15T hardness. When seamless steel tube diameter greater than 26 mm, can also use the rockwell or surface rockwell hardness tester to test the hardness of tube wall.

Precision steel pipe manufacturing process

Is a cold drawn or after hot rolling process of a kind of high precision steel tube material. Because of the precision steel tube inside and outside wall without oxidation layer, under high pressure without leakage, high precision, high finish, cold bending deformation, flaring, flattening without cracks a bit, it is mainly used to produce pneumatic or hydraulic components products, such as a cylinder or cylinder, can be a seamless steel pipe, welded pipe. The chemical composition of precision steel tube with carbon sulfur C, Si, Si, Mn, Mn, S, P, P, chromium Cr. The pronunciation of precision steel pipe China: j ǐ ng ā ng gu mi g m: n Spain: tubo preciso DE acero French: le tube d acier DE precision The difference between precision steel pipe and seamless pipe 1, seamless steel pipe main characteristic is a welding seam, can withstand greater pressure. Products can be very rough as-cast or cold dial. 2, precision steel pipe is the product appeared in recent years, mainly is the inner hole, the size of the outer wall with strict tolerance and roughness. The characteristics of cold drawn precision steel pipe 1. The outer diameter smaller. 2. High precision can be born small batch 3. Cold drawn finished products of high precision, good surface quality. 4. The steel pipe transverse area is more complex. 5. Steel pipe is superior performance, dense metal. The difference between after hot rolling precision steel pipe Hot rolled precision tube with the slab or slab continuous casting round billet as a raw material, by step heating furnace, high pressure water descaling after entering the roughing mill, roughing expected by the cutting head, tail, and then into the finishing mill, and the implementation of computer control rolling and finishing after through laminar cooling and the winder, become straight hair volume. Straight hair volume of head and tail often show tongue shape and fish shape, thickness and width accuracy is poorer, side often exists defects such as wave shape, folding, tower. The volume weight is heavier, coil diameter is 760 mm. To pass through the cutting head and cutting tail straight hair volume, trimming and straightening, level off of multichannel time after finishing line processing, cutting board or heavy volume, again become namely: hot rolled steel plate, flat hot-rolled coil, slitting and belt and other products. Hot rolling finishing if volume after acid pickling to remove scale and greased the hot-rolled pickling plate volumes. Precision steel pipe commonly used specifications 10 # 0.07 ~ 0.13 ~ 0.37 0.07 0.35 0.65 0.035 0.035 or less or less 20 # 0.17 ~ 0.23 0.17 0.37 0.35 0.65 0.035 0.035 or less or less 35 # 0.32 ~ 0.39 0.17 0.37 0.35 0.65 0.035 0.035 or less or less 45 # 0.42 ~ 0.50 0.17 0.37 0.50 0.80 0.035 0.035 or less or less 40 cr 0.37 ~ 0.44 ~ 0.37 0.37 0.50 0.80 0.035 0.035 0.08 ~ 1.10 or less or less 25 mn 0.22 ~ 0.2 ~ 0.37 0.22 0.70 1.00 0.035 0.035 0.25 or less or less or less 37 mn5 0.30 ~ 0.39 0.15 ~ 0.30 1.20 1.50 0.015 0.020 or less or less

Three kinds of hardness of stainless steel pipe

Stainless steel pipe is a hollow long round steel, are widely used in various industries, hardness is that we need to know about it, the paper simply introduces its three hardness: 1, rockwell hardness, Stainless steel GuanLuo hardness test, like brinell hardness test, indentation test method. The difference is that it is measuring the depth of the indentation, rockwell hardness test is the method of the current application is very wide, including HRC in steel pipe used in standard after brinell hardness HB, rockwell hardness can be applied to determine the extremely soft to hard metal materials, it is not made up for brinell method, the brinell method is simple, can be read directly from the dial of the hardness machine hardness value. However, because of its small creasing, so, as brinell hardness value accurately. 2, brinell hardness In stainless steel tube standard, the most versatile brinell hardness, is often expressed in creasing diameter to the hardness of the material, intuitive, and convenient, but for a hard or thinner steel pipe is not applicable. 3, vickers hardness Stainless steel pipe vickers hardness test indentation test is also one of the ways that can be used for the determination of thin metal materials and surface hardness, it has the major advantages of brinell, rockwell method, and overcomes the drawback of their basic, but not as rockwell method is simple, vickers method is seldom used in the steel tube standard. 4, hardness test Above 6.0 mm, inner diameter of stainless steel tube wall thickness under the 13 mm annealing stainless steel pipes, can use W - type B75 Webster hardness tester, its testing is very rapid, simple, suitable for to do fast nondestructive inspection of qualified stainless steel pipe. Stainless steel pipe diameter greater than 30 mm, wall thickness more than 1.2 mm stainless steel tube, using rockwell hardness tester, HRB, HRC hardness test. Stainless steel pipe diameter greater than 30 mm, wall thickness less than 1.2 mm of stainless steel pipe, the surface rockwell hardness tester, test the HRT or HRN hardness, diameter less than 0 mm, greater than 4.8 mm of stainless steel pipe, pipe use special rockwell hardness tester, hardness testing HR15T, when the stainless steel pipe diameter greater than 26 mm, can also use the rockwell or surface rockwell hardness tester to test the hardness of tube wall.

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