... . Length: 6~12m. 5. Certificate:ISO90001:2000,API. MaterialCarbon steel ,alloy steel ,stainless steel SizeSeamless steel DN15~DN600 , OD:21.3 ... need also can as the clients' requirement ApplicationFluid, gas, transport, drill,hydraulic, oil structure , boiler, heat exchanger, super heater TechnicsCold rolled ...