Zhejiang Guobang Steel Co.,LTD.built on 2004,is an ISO9001,PED97/23/EC,AD2000-W0,DNV and ABS certified seamless pipe and tubes manufacturers in China. Material: stainless steel, Super Duplex and Duplex stainless steel,310S,S31254,Super duplex,904L,Nickel Alloy(Hastelloy C276,C22,Inconel625,Inconel600,Incoloy800H,Incoloy825,Monel400) Producing range: OD:6mm-530mm,WT:1mm-30mm. Monthly Output: 500MT.