... , DIN , EN,MaterialCarbon steel :carbon steelConnectionButt-weldingApplications rangsuch as oil, chemical industry, water conservancy, electric power, boiler, machinery, ... DIN , EN,MaterialCarbon steel :carbon steelConnectionButt-weldingApplications rangsuch as oil, chemical industry, water conservancy, electric power, boiler, machinery, ... quality at most competitive price" carbon steel pipe fitting