... manufactCarbon Seamless steel pipe 1.Commodity NameSeamless steel pipes2.StandardASTM A106 ,ASTM A53 , ASTM A179, ASTM A210 ,ANSI B36.10, GB ... internal coating for water steel pipes.10.MaterialA53(A,B), A106(B,C) Q235B,Q345B,16Mn, 10#.20#,45# Gr.2 ... , England, the Netherlands,Belgium, etc13.CertificatesAPI 5L; ISO9001:2000 ASTM A106/A53 Gr.B seamless steel pipe