ASTM A240 A240M-15b standard specification for Chromium and Chromium-Nickel Stainless Steel Plate...and for General Applications,ASTM A240 A240M-15b standard Austenitic stainless steel main steel grade:S30941,201LN,201L,XM-15(S38100),321(S32100),316L(S31603) and so on.