Changzhou Heyuan Steel Tube Co., Ltd. is a specialized manufacturer of seamless pipes&tubes of carbon steel and alloy steel. We have 3 sets of piercing units, 16 sets of cold-drawn units, 3 sets of straightening units, 3 cutting machines as well as pickling and annealing equipment, to ensure prodution and output, and a special lab with C-S analyzer, Rockwell hardness tester, Eddy-current detection system, material testing device to ensure quality of products. As a specialized manufacturer with annual production capacity of about 50000 MT, we can manufacture and supply pipes&tubes with wide range of sizes (OD:8mm-168mm, *****:0.8mm-22mm) and the grades are available with great variety of carbon steel like ASTM A179, ASTM A106 Gr.A/B/C, ASTM A53 Gr.A/B, DIN 17175 St35.8, ST45.8, GB 10#, 20#, 35#, 45#, etc and alloy steel like ASTM A213 T5, T9, T11, T22, ASTM A335 P5, P9, P11, P22, DIN 17175 15Mo3, 13CrMo44, 12CrMo195, SEW 680 10CrMo910, GB 16Mn, 30CrMo, 42CrMo, 37Mn5, etc. We also manufacture pipes/tubes in accordance with customers&＃039; special requirements about OD, ID, or Thickness, or mechanical properties. We have already obtained ISO9001-2000 Certificate, approval Certificate for production of pipes and tubes for use of boilers and pressure vessels, and accreditation certificate of NDT. Our products are widely used in automotive industry, chemistry, boilers, pressure vessels, superheaters, architecture, heat exchangers, etc. During the past three years, we have built up good image and high reputation in steel tube market in German, India, and Russia. And now, to play a role in a wider market, we are implementing API 5L and API 5CT accreditation. With great prodution capacity, complete inspection device, rich experience and high reputation in steel pipe&tube marketing, we are devoting ourselves to supplying our customers with high-quality seamless steel pipes/tubes.