ASTM美国材料与试验协会(American Society for Testing Materials,ASTM)
ASTM美国材料与试验协会---管件与法兰材质等级信息等ASTM:American Society for Testing and MaterialsASTM A105Carbon Steel Forgings for Piping ApplicationsASTM A182Forged or Rolled Alloy Steel Pipe Flanges, Forged Fittings, and Valves and Parts for high T..