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ASTM a333 gr6 api 5l x52 16 20 30 inch 140mm carbon steel seamless pipe Company Hebe...
1/2" inch carbon steel seamless pipe Company Hebei Borun Steel Trade Co., Ltd Produ...
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Petroleum geological seamless tube Company Hebei Borun Steel Trade Co., Ltd Product...
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Specifications Specifications Copper Cathode 1. Purity: purity 99.99%-99.97% min...