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Stainless steel seamless pipe knowledge

1, stainless steel seamless tube definitions: stainless steel seamless pipe is a hollow section, no seams around a strip of steel.
2, and stainless steel seamless steel tube of features:
one, and the pipe products of wall thick more thick, it on more has economic sex and practical, wall thick more thin, it of processing cost on will significantly of rose;
Second, and the products of process decided it of limitations can, General seamless steel tube precision low: wall thick not uniform, and tube appearance light degrees low, and set feet cost high, and within appearance also has Ma points, and black spots easily removal;
its three, and it of detection and the plastic must offline processing.   So it's high pressure, high strength, mechanical structures materials reflects its superiority.   
3, types of stainless steel tube:-rolling hot-rolled, hot-extrusion and drawing (rolling) of stainless steel tubes.   
stainless steel microstructure-different semi-semi-Markov systems of ferrite stainless steel pipes, Martensitic stainless steel, austenite system stainless steel tubes, austenitic-tiesutie stainless steel pipe and so on.
4, stainless steel specifications and appearance quality of
A, according to the GB14975-94 provisions of the stainless steel seamless pipe, steel pipe lengths usually (indefinite) hot-rolled steel 1.5~10m, hot extrusion pipe equal to or greater than 1M.   Drawing (rolling) wall thickness 0.5~1.0mm, 1.0~7m; the wall thickness is greater than 1.0mm, 1.5~8M.
B, hot-rolled (hot extruding) the diameter of the steel tube 54~480mm total 45; thickness 4.5~45mm total 36.   Drawing (rolling) of the diameter of the steel tube 6~200mm total 65; thickness 0.5~21mm total 39.
C, inside and outside the pipe surface should crack and collapse, cracking, cracking, folding, rolling and scabbing defects exist, which should be completely removed (except for machining tubes), cleared that the wall thickness and outside diameter shall not exceed tolerance.   Other minor surface defects does not exceed the allowed tolerance is not clear.
D, straights allowed depth.   Hot-rolled, hot-extruded steel, diameter is less than and equal to 140mm is not greater than the nominal wall thickness of the 5%, the maximum depth is not greater than 0.5mm; cold drawing (rolling) of the nominal wall thickness of the pipe not more than 4%, the maximum depth is not greater than 0.3mm.
E and pipe ends should be cut at right angles, and remove burrs.