Pipe manufacturing refers to how the individual pieces of pipe are made in a pipe mill; it does not refer to how the pieces are connected in the field to form a continuous pipeline. Each piece of pipe produced by a pipe mill is called a joint or a length (regardless of its measured length). In some cases, pipe is shipped to the pipeline construction site as “double joints”, where two pieces of pipe are pre-welded together to save time. Most of the pipe used for oil and gas pipelines is seamless or longitudinally welded, although spirally welded pipe is common for larger diameters. 1. Structural Steel Pipe: ASTM A53: GR.A, GR.B ASTM A106: GR.A, Gr.B, Gr.C GB/T 8162: 10#, 20#, 35#,45#, Q345A, Q345B, A345C, Q345D, Q345E, 20Cr, 40Cr, 20Mn2, 45Mn2, 40CrB, 27SiMn, 15CrMo, 20CrMo, 35CrMo, 42CrMo ASTM A519: 1020, 1035, 1045, 4130, 4140 DIN1629: St37.0, St44.0, St55, St52.0 DIN17175: St35.8, 17Mn4, 13CrMo44 EN10297: E355, C45, 34CrMo4 JIS G3441: SCM 420TK, SCM440TK JIS G3445: STKM13A, STKM1...
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