... Plate flangeMaterial:Stainless Steel:such as 201, 301, 304,304L,316,316L,321 and so on.Standard:GB,JIS,BS,DIN ... ,2573,2566 ,5K-40K and so on .Sealing surface : FF ,RF, LJ, FM ,R.T.J and so on .Production process ... you in the near future . forged stainless steel flange (304 316 )