... 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 ... ,GOST-9941,GOST-9940 DIN17456,DIN17458 JIS G3459,G3463, A213 tube for boiler