dear sir,our factory mainly manufacture carbon steel seamless pipes.size from OD10mm to OD114.3mm,our output is about 4000ton per month.please not hesitate to contact with me if you have any inquiries.thanks with regardsMS SARA.ZHOU/SALES MANAGERJIANGSU DARUN MACHINE MANUFACTURE CO.,LTD JINGJIANG PIPE BRANCH FIRM (FACTORY)ADDRESS: NO. 6, JIANGPING ROAD,XIEQIAO TOWN,JINGJIANG CITY,JIANGSU,CHINATEL/FAX:0086-0523-84209111 SPEC:API 5L GR.B, ASTM A106 GR.B, DIN17175, ASTM A192 A179