... /4"-30" Seamless pipe and welded steel pipe Seamless Stainless Steel PipeFeatures:1) pipe diameter : 6mm-630mm pipe thickness : 0.8mm-25mm2) Grade : 304,304L,316,316L,321,317L,310S ... :304,304L,316,316L,321,317L,310S,904L and so on. 2.Standards:ASTM,JIS,DIN,GB and so on. 316 seamless stainless steel pipe