a240m是什么材料

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ASTM A240M是标准号，不是材质牌号。该标准中有很多种不锈钢材质。ASTM A240M Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications不锈钢厚板、薄板和带材说明：ASTM是美国材料与试验协会（American Society for Testing and Materials)的标准。