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发明公开
CN109641250A 热轧用辊外层材料及热轧用复合辊 有权

热轧用辊外层材料及热轧用复合辊
摘要：
本发明的目的在于提供确保耐磨损性并且使辊表面的凹坑状缺陷减少、耐表面粗糙性优异的热轧用辊外层材料及热轧用复合辊。热轧用辊外层材料的特征在于，具有下述组成：以质量％计含有C：2.0～3.0％、Si：0.2～1.0％、Mn：0.2～1.0％、Cr：4.0～7.0％、Mo：3.0～6.5％、V：5.0～7.5％、Nb：0.5～3.0％、Ni：0.05～3.0％、Co：0.2～5.0％、W：0.5～5.0％，并且C、Cr、Mo、V、Nb、Ni、W的含量满足下述式(1)，余量由Fe及不可避免的杂质形成，基体组织的85％以上为回火马氏体及/或贝氏体组织，回火马氏体或贝氏体的短径为0.5～3.0μm。0.05≤(％C-％V×0.177-％Nb×0.129-％Cr×0.099-％Mo×0.063-％W×0.033)+(％Ni)≤4.0(1)。其中，％C、％V、％Nb、％Cr、％Mo、％W、％Ni为各元素的含量(质量％)。
摘要（英）：

The purpose of the present invention is to provide a roll outer layer material for hot rolling and a composite roll for hot rolling, whereby wear resistance is ensured, pit-shaped flaws on the roll surface are reduced, and excellent surface roughing resistance is obtained. A roll outer layer material characterized by having a composition containing, in terms of mass%, 2.0-3.0% C, 0.2-1.0% Si, 0.2-1.0% Mn, 4.0-7.0% Cr, 3.0-6.5% Mo, 5.0-7.5% V, 0.5-3.0% Nb, 0.05-3.0% Ni, 0.2-5.0% Co, and 0.5-5.0% W, the content of C, Cr, Mo, V, Nb, Ni, and W satisfying expression (1), and the remainder comprising Fe and unavoidable impurities, at least 85% of the matrix structure of the roll outer layer material being a tempered martensite and/or bainite structure, and the minor axis of the tempered martensite or bainite being 0.5-3.0 [mu]m. (1): 0.05 <= (%C - %V * 0.177 - %Nb * 0.129 - %Cr * 0.099 - %Mo * 0.063 - %W * 0.033) + (%Ni) <= 4.0. In expression (1), the terms %C, %V, %Nb, %Cr, %Mo, %W, and %Niare the content (mass%) of each element.

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