High Frequency Longitudinal Welded Steel Pipe
1) Steel grade: ST37-2, S235JR, Q235A/B, Q345B, Q390B, SS400
2) Size: 33.5-508mm (1''-20'') x 2.0-16mm
3) Standard: GB/T13793-1992; ASTM A53, JISG, DIN1626/2-2458
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