?含铅易车钢

主要金属元素之物理性质 Physical properties of major Metal Elements 含铅易车钢 Leaded Free Cutting Steel 金属材料的试验方法 The Method of Metal inspection ..

?铅快现

... Soft free-cutting steel 易切削低碳钢 Leaded Free Cutting Steel 含铅易车钢 ; 铅快现 Sulphuric Free Cutting Steel 含硫易车钢 ...