... 201# 0.42mm19*19mm stainless steel square pipe,stainless steel tube standard nickle percent good ... cooperation 201# 0.42mm19*19mm stainless steel square pipe,stainless steel tubestandard nickle percentgood pricelong term cooperationStandard:GB ... DIN17458 stainless square pipeApplication:oil, chemical, boiler industry, high temperature resistance,resistant corrosion.Steel grade:TP304L, 316L, 321, 310 ...