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    連鑄管坯質(zhì)量對(duì)鋼管內(nèi)折缺陷的影響

    C.C. Steel Billet Quality vs Steel Tube Internal Folding Defect

    • 摘要: 在對(duì)連鑄管坯晶區(qū)進(jìn)行劃分的基礎(chǔ)上闡述了連鑄管坯穿孔特有的“隔墻”現(xiàn)象,探討了連鑄管坯的低倍組織及主要化學(xué)成分等對(duì)鋼管熱軋的常見(jiàn)缺陷——內(nèi)折的影響和連鑄管坯的各區(qū)域及柱狀晶的大小與內(nèi)折之間的關(guān)系,同時(shí)通過(guò)回歸分析法得出碳當(dāng)量與內(nèi)折率的關(guān)系式。

       

      Abstract: Based on the identification of the grain zones of the C.C.steel billet for tube rolling,the unique phenomenon of "walling" of the billet as being pierced is analyzed.Discussed are the main elements of the C.C.billet responsible for the common defect——internal folding of the hot-rolled tube,i.e.,the macrostructure and chemical composition,and the relationship between different grain zones and the size of columnar crystal and the said internal folding.Moreover the regression method is used to deduce the formula of the relationship between carbon equivalent and the internal folding rate.

       

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