... :6-830MM*0.9-60MM ASTM A312/213, TP304/316L/321 We are an export company with our own mill manufacturing ... seamless pipes and tubes. The material: 201,304,304L,316L,321,347H,317L,310S,904L,TP410,TP420,TP430,TP405, as well ... -830mm)*WT(0.9mm-60mm) steel pipes and tubes,310/321/304/TP316L,stainless steel pipes,seamless pipes,stainless steel seamless ...