Stainless Steel Seamless Pipe
Stainless steel seamless pipe is a hollow cross-section, no seams around the long bar of steel. The thicker the wall thickness of the product, it is more economical and practical, the thinner the wall thickness, it will be a substantial increase in processing costs; the product of the process can determine its limitations, generally seamless precision low : uneven thickness, the outer tube low brightness, high cut-costs, as well as the appearance of pitting, black spots difficult to remove and within; it must be detected and shaping offline processing. Therefore, it reflects its superiority in high-pressure, high-strength mechanical structure the timber.
Stainless steel seamless pipe types
1.the length of the stainless steel seamless pipe is usually (not length) hot-rolled steel one.5 ~ 10m, hot extruded pipe is capable and bigger than 1m. Cold drawn (rolled) steel pipe wall thickness of zero.5 ~ 1.0mm were, 1.0 ~ 7m; wall thickness bigger than one.0mm were, 1.5 ~ 8m.
2. hot (hot extrusion) 54 ~ 480mm total of 45 species diameter stainless steel seamless pipe; wall thickness of 4.5 ~ 45mm total of 36 species. Cold drawn (rolled) steel pipe diameter 6 ~ 200mm total of 65 species; wall thickness of 0.5 ~ 21mm total of 39 species.
3.steel inner and outer surface shall not have cracks, folding, crack, crack, rolled off, separation and scarring defects, these defects should be completely removed (except for tube machining), outside the wall and not after clearing diameter than the negative deviation. Whoever does not exceed the allowable negative deviation of the other minor surface defects do not cleared.
4.straights 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) steel pipe nominal wall thickness of not more than 4%, a maximum depth of not more than 0.3 mm.
5.both ends of the stainless steel seamless pipe should be cut at right angles, and clear the glitch.
Stainless steel seamless pipe manufacturing process
1. Hot-rolled (extrusion stainless seamless steel pipe): round tube perforation → → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage
2.Cold drawn (rolled) stainless steel seamless pipe: round tube perforation → heating → → → annealing → pickling → Heading oiled (copper) → multi-pass cold drawn (cold) → blank tube → heat treatment → straightening → hydrostatic test (testing) → mark → storage.
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