钢与铁 meaning in English

stahl und eisen

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
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