ASTM A792M Standard Specification For Steel Sheet,55 % Aluminum-Zinc Alloy-Coated By The Hot-Dip Process热浸镀55%铝锌合金钢薄板SS Grade 550 是标准中的等级号。说明：ASTM是美国材料与试验协会（American Society for Testing and Materials,ASTM）标准。
