1. standard: ANSI,JIS,DIN,GB,BS,EN. 2. size :DN15~DN600 3. Thickness :2.8~100mm 4. Certificate : ISO9001:2000 ,API,CCS we specialize in this field for 22ears,with the IF push the system, machining , cold forming, hot extrusion and heat treatment craftsmanship strength ,with good quality and pretty competitive price. 1. Material ; carbon steel ,alloy steel ,stainless steel . 2. Size: SEAMLESS DN15 ...