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ERW steel pipe( 1/2”-16” ) Specifications 1.Name: ERW steel pipe 2.Standard: BS 1387-1985, ASTM A53, ASTM A513, ASTM A252-98, JIS G3444-2004 STK400/500 G3452-2004, EN 10219, EN 10255-1996, DIN 2440, ...