ASTM A53/A53M Standards Specification for Pipe, NPS 1/4 INCH – 30 INCH ,Schedules 10 -160, STD, XH and XXH Welded and Seamless

differentce between ERW pipe and EFW pipe
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ASTM A252 Grade 2 Pipe Steel Tube
ASTM/ASME A252/SA252 Grade 2 Piling steel Pipe
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