... 5K-160K STANDARD: ASTM, JIS,DIN. Stainless Steel Flanges Material:Stainless steel(304,304L,316,316L,317L,321,321H ... ,310S,347H,S1803,904L)Stainless Steel FlangesFeatures: ... ,SH3408, SH3409,HG/T21635 ,HG/T216313)Material:Stainless steel(304,304L,316,316L,317L,321,321H ... for customers special requirements. welding stainless steel flanges