A. American Standard ERW high frequency welded pipe ASTM A53, Specification: 1/2 "-20" ,21.3-508mm
The
2 British standard, ERW high frequency welded steel pipe BS1387, specifications: 1/2 "-6" ,21.3-168 .3 mm
Three automotive transmission welding steel pipe GB9947-88 YB/T5209-2000
Welded steel tubes for 4 belt conveyor idlers
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