Stainless steel seamless tube related knowledge explained
2023-06-06 13:11:25
(1) Stainless Steel Seamless Pipe Definition Stainless steel seamless pipe is a long steel bar with a hollow section and no joints around it.
(2) Characteristics of stainless steel seamless pipe The first, the thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the greater its processing cost will be. Second, the product's The process determines its limited performance. Generally, the accuracy of the seamless steel pipe is low: the wall thickness is not uniform, the brightness of the inside and outside of the pipe is low, the length of the cut-out is high, and the inside and outside of the table have pits and black spots that are not easy to remove; thirdly, its detection and Shaping must be handled offline. Therefore, it shows its superiority in high-pressure, high-strength, mechanical structural materials.
(3) The type of stainless steel pipe followed by hot rolling, hot extrusion and cold drawing (rolling) of stainless steel pipe.
According to the stainless steel metallographic structure, it is divided into half ferritic half Martensitic stainless steel pipe, martensitic stainless steel pipe, austenitic stainless steel pipe, and austenitic-ferritic stainless steel pipe.
(4), stainless steel pipe specifications and appearance quality A, according to GB14975-94 "stainless steel seamless steel pipe" requirements, the general length of the pipe (not fixed feet) hot-rolled steel pipe 1.5 ~ 10m, hot-extruded steel pipe is equal to or greater than 1m. Cold drawn (rolled) steel pipe wall thickness 0.5 ~ 1.0mm, 1.0 ~ 7m; wall thickness greater than 1.0mm, 1.5 ~ 8m.
B. Hot-rolled (hot-extruded) steel pipes have a diameter of 54 to 480mm in a total of 45 types and a wall thickness of 4.5 to 45mm in total of 36 types. Cold drawn (rolled) steel pipe diameter of 6 ~ 200mm a total of 65 species; wall thickness 0.5 ~ 21mm total of 39 species.
C. The internal and external surfaces of the steel pipe shall be free of cracks, folds, cracks, cracks, pleats, delamination, and scarring defects. These deficiencies shall be completely removed (except for mechanical processing pipes), and the wall thickness shall not be removed after removal. The trail exceeds the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation may not be removed.
D, straight allow depth. Hot-rolled, hot-extruded steel tubes, with diameters less than or equal to 140 mm, no greater than 5% of nominal wall thickness, maximum depth no greater than 0.5 mm, cold-drawn (rolled) steel tubes no greater than 4% of nominal wall thickness, maximum depth no greater than 0.3 Mm.
E. Both ends of the pipe should be cut at right angles and the burrs should be removed.
(2) Characteristics of stainless steel seamless pipe The first, the thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the greater its processing cost will be. Second, the product's The process determines its limited performance. Generally, the accuracy of the seamless steel pipe is low: the wall thickness is not uniform, the brightness of the inside and outside of the pipe is low, the length of the cut-out is high, and the inside and outside of the table have pits and black spots that are not easy to remove; thirdly, its detection and Shaping must be handled offline. Therefore, it shows its superiority in high-pressure, high-strength, mechanical structural materials.
(3) The type of stainless steel pipe followed by hot rolling, hot extrusion and cold drawing (rolling) of stainless steel pipe.
According to the stainless steel metallographic structure, it is divided into half ferritic half Martensitic stainless steel pipe, martensitic stainless steel pipe, austenitic stainless steel pipe, and austenitic-ferritic stainless steel pipe.
(4), stainless steel pipe specifications and appearance quality A, according to GB14975-94 "stainless steel seamless steel pipe" requirements, the general length of the pipe (not fixed feet) hot-rolled steel pipe 1.5 ~ 10m, hot-extruded steel pipe is equal to or greater than 1m. Cold drawn (rolled) steel pipe wall thickness 0.5 ~ 1.0mm, 1.0 ~ 7m; wall thickness greater than 1.0mm, 1.5 ~ 8m.
B. Hot-rolled (hot-extruded) steel pipes have a diameter of 54 to 480mm in a total of 45 types and a wall thickness of 4.5 to 45mm in total of 36 types. Cold drawn (rolled) steel pipe diameter of 6 ~ 200mm a total of 65 species; wall thickness 0.5 ~ 21mm total of 39 species.
C. The internal and external surfaces of the steel pipe shall be free of cracks, folds, cracks, cracks, pleats, delamination, and scarring defects. These deficiencies shall be completely removed (except for mechanical processing pipes), and the wall thickness shall not be removed after removal. The trail exceeds the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation may not be removed.
D, straight allow depth. Hot-rolled, hot-extruded steel tubes, with diameters less than or equal to 140 mm, no greater than 5% of nominal wall thickness, maximum depth no greater than 0.5 mm, cold-drawn (rolled) steel tubes no greater than 4% of nominal wall thickness, maximum depth no greater than 0.3 Mm.
E. Both ends of the pipe should be cut at right angles and the burrs should be removed.
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