低中压锅炉用无缝钢管

低中压锅炉用无缝钢管低中压锅炉用无缝钢管
  1. GB3087-1999低中压锅炉用无缝钢管标准述评

    Commentary on the standard of seamless steel tubes for boiler

  2. GB3087-1982低中压锅炉用无缝钢管

    Seamless steel tubes for low and medium pressure boiler