... 321,310S,410,410S,430,347H,2Cr13,3Cr13 etcApplication rangeFoodstuff, Gas, metallurgy, biology, electron, chemical, petroleum,boiler, nuclear ... , fertilizer etcCertificatePower station large diameter high pressure steel pipe manufacturing license,Boiler making of grade A; pressure ... power plant pressure pipeline, ship pipe factory of china Classification Society, pressure pipe & part of China and self ...