Wenzhou hengyuan steel tube CO.,LTD. is a professional manufacturer of stainless steel seamless tubes and pipes .We are specially competitive in ASTM A 312 316L and 316 series. Specification (O.D1/4inch-16inch*W.T Sch5S, SCH10S , SCH40S) , length can meet as your requirement. And we also provide ASTM A312 321,304,304L, 310s etc. and other standard like DIN and JIS series .