Specifications and appearance quality of stainless steel seamless pipe

A. According to the provisions of GB14975-2002 "Stainless Steel Seamless Steel Pipe", the length of the steel pipe is usually 1.5~10m of hot-rolled steel pipe, and the hot-extruded steel pipe is equal to and greater than 1m. Cold-drawn (rolled) steel pipe wall thickness 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 54~480mm; There are 36 types of wall thickness 4.5~45mm. There are 65 kinds of cold-drawn (rolled) steel pipes with diameters of 6~200mm; There are 39 kinds of wall thickness 0.5~21mm.
C. There shall be no cracks, folds, cracks, cracks, rolling, delamination and scarring defects on the inner and outer surfaces of the steel pipe, and these defects should be completely removed (except for the pipe for machining), and the wall thickness and outer diameter shall not exceed the negative deviation after removal. Other minor surface defects that do not exceed the permissible negative deviation may not be removed.
D. The allowable depth of the straight. Hot-rolled and hot-extruded steel pipes, diameter less than or equal to 140mm not more than 5% of the nominal wall thickness, maximum depth not more than 0.5mm; cold-drawn (rolled) steel pipe not more than 4% of the nominal wall thickness, maximum depth not more than 0.3mm.
E. Both ends of the steel pipe should be cut at right angles and burrs should be removed.