... ISO9001:2000, PED97/23/EC and AD 2000-Merkblattwo We are a quality stainless steel tube manufacturer in China, our ... tubes according to ASTM/ASME A213 are widely used in heat exchanger,pressure vessels, ... our client include API(Suzhou),GEA(Shanghai),Larsen&Toubro,SINOPEC,SHELL,CNOOC and QINSHAN Nuclear ...