We are offering iron steel. Specificationsiron steel standard:gb/t, astm, en, etc outer diameter:0.5inch-14inch wall thickness:0.7mm-12mm quick details:standard: bs 1387, bs 1139, bs en10025, bs en 39, etc grade: 10#-45#, 16mn, a53-a369, st35-st52, q195, etc grade: 20#, 16mn, a53(a, b), st37, st52, st42, etcplace of origin: tianjin china (mainland) secondary or not: non-secondary technique: erw surface treatment: galvanized pipe alloy or not: non-alloy certification: iso9001-2000product nameerw steel pipeouter diameter0.5inch-14inchwall thickness0.7mm-12mmmaterialq195, q, 215, q235, q235b, q345bquality gradefirst gradelength4m-12mmoq10metricton.