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The difference between stainless steel seamless pipe and stainless steel pipe

Source:Haosimai    Hits:    Date:2019.01.17

  Stainless steel seamless steel pipe is a hollow section, the surrounding no seam of the long steel.
  Stainless steel welded steel pipe is also a hollow section of the steel, but it is welded through the plate into a steel pipe, so the welded steel pipe has a welding gap.
  The characteristics of stainless steel seamless pipe
  First, the thicker the product wall thickness, it is more economical and practical, the thinner the wall thickness, its processing costs will be a substantial increase; Second, the product process to determine its limited performance, general Seamless steel pipe low precision: uneven wall thickness, tube inside and outside the table brightness is low, the cost of high scale, and there are pitting inside and outside the table, black spots are not easy to remove; Third, its detection and shaping must be off-line processing. So it is in the high-pressure, high strength, mechanical structure of the material reflects its superiority.
  The type of stainless steel pipe
  Hot rolling, hot extrusion and cold drawing (rolling) stainless steel tubes.
  Stainless steel tube specifications and appearance quality
  A, according to GB14975-94 "stainless steel seamless steel pipe" provides that the pipe is usually length (not fixed) hot-rolled steel pipe 1.5 ~ 10m, hot extrusion pipe is equal to and 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. Stainless steel welded pipe
  B, hot-rolled (hot-extruded) steel pipe diameter 54 ~ 480mm total of 45; wall thickness 4.5 ~ 45mm a total of 36 species. Cold drawn (rolled) steel pipe diameter 6 ~ 200mm total of 65 kinds; wall thickness of 0.5 ~ 21mm a total of 39 species.
  C, the inner and outer surfaces of the steel pipe shall not be cracked, folded, cracked, cracked, rolled, separated and scarring defects exist, these defects should be completely removed (except for machining pipe), after the removal of the wall thickness and not Diameter exceeds negative deviation. Any other minor surface defects that do not exceed the allowable negative deviation may not be cleared.
  D, straight to allow depth. Hot-rolled, hot-extruded steel pipe, diameter less than or equal to 140mm is not greater than the nominal wall thickness of 5%, the maximum depth of not more than 0.5mm; cold drawn (rolled) steel pipe is not greater than the nominal wall thickness of 4%, the maximum depth of not more than 0.3 mm. Stainless steel pipe manufacturers
  E, both ends of the pipe should be cut at right angles, and remove the burr.

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