Stainless steel seamless pipe definition: Stainless steel seamless pipe is a kind of hollow cross section, no seams around the long bar of steel.
Stainless steel seamless pipe Features:
1. The thicker the wall thickness of the product, it becomes an economic and practical, the thinner wall thickness, it will greatly increase processing costs;
2. The product of the process can determine its limitations, the general low precision seamless steel tubes, uneven thickness, the tube surface brightness is low, the high cost of fixed length, and also the appearance of pitting, and hard to eliminate black spots;
3. The detection and shaping it to work offline. Therefore it is high pressure, high strength, mechanical aspects of structural material reflects its superiority.
Stainless Steel Tube Type:
1. Rolling methods, sub-rolled, hot extruded and cold drawn (rolled) stainless steel tube.
2. Stainless steel microstructure at different half-a-half Markov system ferrite stainless steel, martensitic stainless steel pipe, austenitic stainless steel, austenitic – ferritic stainless steels tubes.
Stainless steel pipes specifications and the appearance of quality:
A. According to GB14975-94 "stainless steel seamless pipe," provides that the length of pipe is usually (not length) hot-rolled steel 1.5 ~ 10m, hot extruded pipe is equal to and greater than 1m. Cold drawn (rolled) pipe wall thickness 0.5 ~ 1.0mm were, 1.0 ~ 7m; wall thickness greater than 1.0mm were, 1.5 ~ 8m.
B. Hot (hot extrusion) and the diameter 54 ~ 480mm total of 45 species; wall thickness 4.5 ~ 45mm total of 36 species. Cold drawn (rolled) and the diameter 6 ~ 200mm total of 65 species; wall thickness of 0.5 ~ 21mm total of 39 species.
C. Steel inner and outer surface shall not crack, collapse, crack, crack, rolling and folding, there is separation and scarring defects, these defects should be completely removed (except for tube machining), cleared the wall thickness and diameter of not more than negative deviation. Which do not exceed the allowable negative deviation of the other minor surface defects do not cleared.
D. Straight to allow depth. Hot-rolled, hot extruded steel tube, 140mm in diameter and is equal to not more than 5% of the nominal wall thickness, maximum depth of less than 0.5mm; cold drawn (rolled) pipe wall thickness of not more than 4% of the nominal maximum depth of not more than 0.3mm.
E. Pipe ends should be cut at right angles, and clear the glitch.