... :API/ISO9000 10 inch sch100 jis standard steel pipe Type steel pipePipe Size1/2"—48" (DN15 ... STPT42,STB42,STS42,STPT49,STS49ApplicationLow and middle pressure fluid pipeline, boiler, petroleum and natural gas industry, drilling, ... chemical industry, electric industry, shipbuilding, fertilizer equipment and pipeline, structure, petrochemical, pharmaceutical industrySurface Black painting, varnish paint ...