STR is a Group Company. Full name is Hebei Shengtian Group Reaguan Pipeline Co., Ltd, which mainly produce and export seamless steel pipes, spiral steel pipes, welded steel pipes and oil pipes . Our annual output is 150000 tons. We have variety of specialized Engineers 98 persons that can supply better, convenient and fast service to our clients. Your want is always the direction of our efforts. Our company can supply you the following standards pipes. GB/T8163-2008， GB/T8162-2008， GB3087-2008， GB5310-2009， GB6479-2013， GB/T17396-2009，GB/T9711-2001/ API Spec 5L, API 5L PLS1/PLS2, ASTM B36.10M-1996,DIN17175 ST45-III, DIN17440，BS EN 10255, SY/T5037-2012, SY/T5040-2012, BS1387,BS1139, BS EN10219, GB/T3091,ASTM A53,ISO65, ASTM A500,BS EN10296-2006, JIS G3460, JISG3444-2006, JISG3445-2006, etc. Sizes are from 1/4 inch to 140 inches and thickness is from 2mm to 60mm.