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发明授权
CN107148322B 连续铸造用铸模及钢的连续铸造方法 有权

连续铸造用铸模及钢的连续铸造方法
摘要：
本发明提供一种连续铸造用铸模，其能够防止凝固壳厚度的不均匀所引起的铸片表面裂纹，该凝固壳厚度的不均匀由伴随着包晶反应的中碳钢中的从δ铁向γ铁的相变所引起。该连续铸造用铸模具备铜制或铜合金制的铸模铜板，至少在从弯月面到距离弯月面20mm以上的下方的位置的铸模铜板(1)的内壁面，分别独立地具有直径2～20mm的多个异种金属填充部(3)，该异种金属填充部(3)是将热传导率相对于铸模铜板的热传导率为80％以下或125％以上的金属填充在设置于上述内壁面的圆形凹槽而形成的，铸模铜板的维氏硬度HVc与所填充的金属的维氏硬度HVm的比满足下述(1)式，并且铸模铜板的热膨胀系数αc与所填充的金属的热膨胀系数αm的比满足下述(2)式。0.3≤HVc/HVm≤2.3··(1)，0.7≤αc/αm≤3.5··(2)。
摘要（英）：

Provided is a continuous casting mold with which it is possible to prevent a crack on the surface of a cast piece due to a variation in the thickness of a solidified shell caused by transformation from ´ iron to ³ iron in medium-carbon steel which is accompanied by a peritectic reaction. A continuous casting mold having a mold copper plate composed of copper or a copper alloy, the mold having plural separate portions 3 filled with a foreign metal formed by filling circular concave grooves formed on the inner wall surface of the mold copper plate and having a diameter of 2 mm to 20 mm in the inner wall surface of the mold copper plate 1 at least in the region from a meniscus to a position located 20 mm or more lower than the meniscus with the foreign metal whose thermal conductivity is 80% or less of that of the mold copper plate or 125% or more of that of the mold copper plate, in which the ratio of the Vickers hardness HVc of the mold copper plate to the Vickers hardness HVm of the filling metal satisfies relational expression (1) below, and in which the ratio of the thermal expansion coefficient ±c of the mold copper plate and the thermal expansion coefficient ±m of the filling metal satisfies relational expression (2) below. 0.3 ‰¤ HVc / HVm ‰¤ 2.3 0.7 ‰¤ ±c / ±m ‰¤ 3.5

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