ferrous metal pipe meaning in English

黑色金属管

Specification for plastic - lined ferrous metal pipe , fittings and flanges
带塑料内衬的铁合金管配件和法兰规范
Standard specification for plastic - lined ferrous metal pipe , fittings , and flanges
有塑料内衬的铁合金管配件和法兰的标准规范
Specification for propylene and polypropylene plastic - lined ferrous metal pipe and fittings
丙烯及聚丙烯塑料衬里的黑色金属管及配件规范