ASTM A106 Seamless pipe: widely used in petrolem, natural gas, chemical ... -1999 API 5LASTM A106/53Material:10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42,Thickness ... requests.Painting: varnish coating or as the client's request. ASTM A106 Seamless pipe