ASTM A53 ERW Black Steel Pipe 1,standard:ASTM,DIN,BS,JIS 2,material:10#,20#,45# 3, ... :1/2-24 Certification:ISO API ASTM A53 ERW Black Steel Pipe1,standard:ASTM,DIN,BS,JIS2,material:10#,20#,45# 3 ... ,etc.Delivery:FOB/CIF/CFRDelivery Time:According to the customer’s request.Othersa) Special design available according to requirement.b) Anti ...