This is livian from HeBei zhonghai steel pipe manufacturing corporation (china zhonghai Group) I find your address from google.com .

We are specialized in seamless pipe, our product as follows:DIAMETER:               3"---40"WALL THICKNESS:   SCH10---SCH160USAGE:                     Applicable to transport liquid, gas, oil etc.Steel Grade:                API 5L: Gr.B X42 X46 X52 X60                                  GB/T 8163:10# 20# 35# 45# 16MN(Q345B)                                 GB 3087:10# 20# 35# 45# 16MN(Q345B)                                 GB 5310:20G 12Cr1MoV  12Cr1MoG  12CrMoG                                 ASTM A106/53:Gr.A Gr.B Gr.C                                 DIN 1629: St 37.0  St 44.0 St 52.0                                 DIN 17175: St35.8 St45.8 17Mn4 17Mn5 15Mn5 15Mo3 13CrMo910                               Welcome your inquiry and we'll give you the best price, good quality, and the excellent service.