Shandong Xinyuan Steel Pipe Manufacturing Co.,Ltd Exporting steel pipes and fittings Manufacture ERW steel pipe,seamless steel pipe Material:API 5L X42-X80,P11,P12,P91,P5,ASTM A106 GrB,NPT threading pipe professional in steel pipe business over 8 years Main standard: ANSI B16.9 standard, ASTM A106B,API 5L GrB,DIN 2448/17575,ASTM A234 WPB,JIS standard,
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