KWK Steel is one of best carbon and stainless steel tube products manufacturer and exporter in China which own ISO9001:2008 certificate. Our process include cold drawing, cold rolling, hot rolling and hot expanding. Our size rang for seamless is as below: OD: 5mm~820mm WT: 0.25mm~120mm Standard we could supply is as below: ASTM: A53, A106, A192, A179, A210, A519, A213, A312, API 5L, API 5CT, etc. DIN: DIN17175, DIN1629, DIN2440, DIN2391, DIN2393, etc. EN: EN10210, EN10255, EN10216, EN10297, EN10305. Contact us for more information! KWK Steel Co.,Ltd Tel: +86-576-88801963 Fax: +86-576-88809380 Website: http://www.kwksteel.com E-mail: exportb@kwksteel.com Address: E813, Xintai Square Building, Jiaojiang District, Taizhou, Zhejiang, China 318000