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    Φ820mm限動芯棒精密軋管機組的研發(fā)與應(yīng)用

    R&D and Application of Φ820 mm Retained-mandrel Precision Pipe Mill

    • 摘要: 結(jié)合大直徑熱軋無縫鋼管的特點，介紹了Φ820mm限動芯棒精密軋管生產(chǎn)線的設(shè)備組成及新型錐形輥穿孔機和限動芯棒精密軋管機的工藝流程、主要參數(shù)和特點，以及軋制產(chǎn)品的幾何尺寸精度。檢測結(jié)果表明：在沒有定徑軋制的情況下，通過穿孔、限動精軋或穿孔、二次穿孔、限動精軋的荒管外徑尺寸精度超出成品管精度（外徑公差≤±0.5%D）要求；而軋后荒管的壁厚尺寸精度在成品管精度（壁厚公差±5%S～±8%S）要求的范圍之內(nèi)。

       

      Abstract: Based on the characteristics of the large-sized hot-rolled seamless steel tube，described in the paper are the equipment composition of the Φ820 mm retained-mandrel precision pipe-rolling plant，and the main aspects of the new type CTP mill and the retained-mandrel precision pipe mill proper，including the manufacturing process flows，major technical parameters and characteristics，etc. Also described are the geometric dimensional tolerances of the products as rolled. Relevant inspection results show that without being subjected to the sizing process，the tube as manufactured via such processes as piercing plus finish-rolling with retained-mandrel mill or piercing plus secondary piercing and finish-rolling with retained-mandrel mill has the O.D. tolerance better than that of the finished tube （O.D. tolerance≤±0.5%D），while the W.T. tolerance is within the specified tolerance scope of the finished tube （W.T. tolerance ±5%S~±8%S）.

       

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