Specification for steel butt - welding pipe fittings for the petroleum industry - wrought carbon and ferritic alloy steel fittings 石油工业用钢对焊管管件规范.第1部分:锻制碳钢与铁素体合金钢管件
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Specification for steel butt - welding pipe fittings for the petroleum industry - wrought carbon and ferritic alloy steel fittings - metric units 石油工业用钢质对接焊管配件规范.锻制碳钢与铁素体合金钢配件:米制件