ASTM A240 A240M-15b standard specification for Chromium and Chromium-Nickel Stainless Steel Plate and for General Applications,ASTM A240 A240M-15b standard ferritic or Martensite stainless steel main steel grade:XM-27(S44627),XM-33(S44626),444(S44400),436(S43600),430(S43000) and so on.