304 stainless steel seamless pipe knowledge, stainless steel seamless pipe definition
The stainless steel seamless pipe is a long strip of steel with a hollow section and no seams around it.
2, the characteristics of stainless steel seamless pipe
First, the thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the higher the processing cost will be. Secondly, the process of the product determines its limited performance. The seamless steel tube has low precision: uneven wall thickness, low brightness inside and outside the tube, high fixed-length cost, and pitting and black spots on the inner and outer surfaces are not easy to remove; thirdly, its detection and shaping must be processed offline. Therefore, it embodies its superiority in high-pressure, high-strength, mechanical structural materials.
3, the type of stainless steel pipe
The rolling method is divided into hot rolling, hot extrusion and cold drawing (rolling) stainless steel tubes.
According to the stainless steel metallographic structure, it is divided into semi-ferritic semi-Martensitic stainless steel pipes, martensitic stainless steel pipes, austenitic stainless steel pipes, austenitic-ferritic iron stainless steel pipes.
4, stainless steel pipe seamless pipe specifications and appearance quality
A. According to the provisions of GB1975-94 "Stainless Steel Seamless Steel Pipe", the normal length of steel pipe (indefinite) hot-rolled steel pipe is 1.5~10m, and the hot-extruded steel pipe is equal to or greater than 1m. Cold drawn (rolled) steel pipe wall thickness of 0.5 ~ 1.0mm, 1.0 ~ 7m; wall thickness greater than 1.0mm, 1.5 ~ 8m.
B. There are 45 kinds of hot-rolled (hot-extruded) steel pipes with a diameter of 54-480 mm; a total of 36 kinds of wall thicknesses of 4.5-45 mm. There are 65 kinds of cold drawn (rolled) steel pipes with a diameter of 6 to 200 mm, and 39 kinds of wall thicknesses of 0.5 to 21 mm.
C. There shall be no cracks, folds, cracks, cracks, rolling, separation and crusting defects on the inner and outer surfaces of the steel pipe. These defects shall be completely removed (except for mechanical processing pipes), and the wall thickness and outer wall shall not be removed after removal. The diameter exceeds the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation may not be removed.
D. Straight road allows depth. Hot-rolled, hot-extruded steel pipe, diameter less than or equal to 140mm is not more than 5% of the nominal wall thickness, the maximum depth is not more than 0.5mm; cold drawn (rolled) steel pipe is not more than 4% of the nominal wall thickness, the maximum depth is not more than 0.3 Mm.
E. Both ends of the steel pipe should be cut at right angles and the burrs should be removed.
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