... ,ABS,DNV,KR,LR,GL, GOST certified leading maunfacture .Duplex stainless steel pipeStandards:ASTM A312,ASTM A213,ASTM A269 , ASTM A789,DIN17456 ... , 317L, 321,904,S31803,S31500,S32750 Outside Diametre:6mm - 700mm (stainless steel seamless pipe) Wall Thickness: 0.9mm - 40 mm Max Length ... ,CE/PED,ABS, DNV,KR,LR,GL, GOST certification. and ever been to Germany ,Holland ,middle East ,American ,etc for tube ...