stainless steel seamless tubes can make as ASTM: 347/ S34700 SIZE D-SMM: OD6-530* 0.5-28mm 0Cr18Ni11Nb STANDARD: ASTM A213/ A213M ASTM A312/ A312M JIS G3459 DIN 17456 .our products are used for fluid transport, bioler tube, and very good quality