Product ERW Steel Pipe Material Carbon Steel Grade Q195=S195/A53 Grade A Q235=S235/A53 Grade B/A500 Grade A/STK400/SS400/ST42.2 Q345=S355JR/A500 Grade C Standard DIN 2440,ISO 65, EN10255, BS1387,GB/T3091,GB/T13793, JIS 3444/3466, API 5L,ASTM A53,A500,A36,ASTM A795 Superficies Bare/Naturalis Nigri Fines Plain Finibus Vel Sine Caps Extra Murum Crassitudo Dn Inch mm mm 15 20~21.3 0.95~2.77 20 3/4".
