201# 0.42mm19*19mm stainless steel square pipe,stainless steel tube standard nickle percent good price long term cooperation 201# 0.42mm19*19mm stainless steel square pipe,stainless steel tubestandard nickle ... ,ASTM A312,JIS G3459,DIN17458 stainless square pipeApplication:oil, chemical, boiler industry, high temperature resistance,resistant corrosion.Steel grade:TP304L, 316L, 321 ...