ASTM A106 Seamless pipe: widely used in petrolem, natural gas, chemical power, fire and other industries. seamless pipe API 5LUsageLow and middle pressure fluid transportation pipeline ... Standard:GB8163-1999 API 5LASTM A106/53Material:10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42,Thickness ...