seamless steel pipe 10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42, St 52, Q 235, Q 195, Q345, 27SiMn seamless steel pipe Production Carbon seamless steel pipe Brand Xin Hai Feng Specification 10.29mm-1016mm (1/8''-40'')× 1.2mm-39mm Standard GB, ASTM, API 5L, API 5CT,DIN, JIS Out Diameter 10.29mm-1016mm. (1/8''-40'') Wall Thickness 1.2mm-39mm Grade 10#,20#,45#,16Mn,27SiMn,12Cr1MoV, ...