Today we stainless steel welding pipe factory to say the specification and appearance quality of stainless steel welded pipe:

A. According to gb14975-94 "Stainless Steel Stainless Steel Welded Pipe Spot", the steel pipe is usually 1.5 ~ 10m in length (variable feet), and the hot extruded steel pipe is equal to or greater than 1m. Cold-drawn (rolled) steel tube wall thickness of 0.5 ~ 1.0mm, 1.0 ~ 7m; Wall thickness greater than 1.0mm, 1.5 ~ 8m.

B, hot rolled (hot extrusion) steel pipe diameter 54 ~ 480mm altogether 45 kinds; There are 36 kinds of wall thickness 4.5 ~ 45mm. 65 kinds of cold-drawn (rolled) steel tubes with diameters of 6 ~ 200mm; There are 39 kinds of wall thickness between 0.5 and 21mm.

C. There shall be no cracks, folds, cracks, crackles, lamination and scarring defects on the inner and outer surfaces of steel pipes. These defects shall be completely removed (except for pipes used for mechanical processing), and the wall thickness and outer diameter shall not exceed negative deviations after removal. Other minor surface defects that do not exceed allowable negative deviations may not be removed.

D. The allowable depth of the straight. Hot-rolled and hot-extruded steel tubes, with diameters less than or equal to 140mm, no more than 5% of the nominal wall thickness, and the maximum depth no more than 0.5mm; Stainless steel welded pipe is not more than 4% nominal wall thickness, maximum depth is not more than 0.3mm.