The surface of the 304 stainless steel pipe
is due to the production process. The surface will bring some defects such as: crack, hairline, fold, fold, rolling broken, the straight, straight, delamination, scarring, dimples, convex package, Ma Hang Abrasion), spiral within the road, the outer spiral Road, green, correction, such as roller India. Which cracks, folding, folding, rolling break, from the floor, scarring, dimples, convex package.
(1) Imperfections on 304 stainless steel pipes that are judged as non-defective may be repaired without modification.
(2) All repairable surface defects should be removed by sharpening. When grinding should be made after the grinding area of the city and stainless steel tube
smooth transition of the original outline. Local appearance inspection methods should be used and if necessary, the defect may be completely removed by means of a suitable non-destructive testing (NDT) method.
(3) 304 stainless steel pipe with irreparable surface defects should be sentenced to failure of the entire root of stainless steel pipe, affixed unqualified signs on unqualified tube stack handling.