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wholesale gi pipe sch 40

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  • [Industry News] Connection method of galvanized steel pipe

    Galvanized steel pipe connection method: threaded, welded.Roll groove connection(1) Cracking of roll groove weld1. Smooth the inner wall welding ribs of the pressure groove part of the nozzle to reduce the resistance of the rolling groove.2. Adjust the axis of steel pipe and rolling groove equipment

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