321 stainless steel tubes 1.Grade:304,304L,316,316L,321,317L,310S,904L ... .3) Standards: /ASTM/ASME/DIN/JIS and etc4) Applications range: for use in the petroleum, chemical, medical equipment, boiler heat- exchanger and ... Address: A Dist.33,Steel Market,Fenghuang Industry Park,Dongchangfu Dist.,LiaochengMobile:0086-13326353000Tel:0086-0635-5082088Fax: 0086-0635-5080066 321 stainless steel tubes