... 30-457mm2.W.T: 2.77-45.24mm3.Length of pipe: 5-12m4.good quality and cheap Low AlloyGB 5310, ... GB3087, DIN 17175St52.4, 16Mn, Boiler pipe, Alloy seamless steel pipeQ345-B, Structure pipe High AlloyGB 5310, G3458, G3462,A335-P12 ... 0865API 5L-0593 Special Pressure Equipment PermissionISO 9001:2000Main productsSeamless carbon pipe Seamless oil casing Seamless alloy Applicationfor ordinary services& tubing, ...