Stainless I-steel Grade : AISI 304 , 201 ,316 , 321 etc, 10#,12#,14#,16#,18#,20#, ... 22#,25#,28#,32#,36#,40# ProductStainless steel I-beam ... produced according to drawing and sampleMaterial Grade201,301,302,303,304,304L,316,316L,321 ,309S, 309H, 310, 310S etcStandardANSI/ASTM ...