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目前,马格尼托哥尔斯克冶金联合企业(MMК)四辊轧机的支承辊采用两种方法制造: 用合金钢9Х,9ХΦ,9Х2,60ХH锻造(80ХH38Φ和80ХHЗB合金钢轧辊生产上已不再采用)和将铸铁或淬火后的合金钢辊套装配在一根低合金钢轴工。ГОСТ 3541-57除对制造支承辊的钢号作了规定外,还规定了辊身的表面硬度。实际供货时1450热轧机和1200冷轧机支承辊的硬度为40～60肖氏硬度并具有常化后的微观结构。在1450轧机上具有铸铁辊套的支承辊的破坏大部分是由于剥蚀所造成的,工作寿命很低(见图1,A)。目前这种轧辊已不再使用。0ХΦ钢轧辊破坏的原因主要是断裂(占44%)和剥鉵(占22%),由于自然磨损而报废的轧辊仅占33%。80НХЗВ钢轧辊剥蚀现象更严重(报废率达31%)。在1200轧机上9ХΦ钢轧辊破坏
Currently, the back-up rolls of the four-high rolling mill of the Magnitogorsk Metallurgical Complex (MMK) are manufactured in two ways: forging with alloy steels 9Х, 9ХΦ, 9Х2, 60ХH (80ХH38Φ and 80ХHЗB alloy steels are no longer produced Using) and cast iron or quenched alloy steel sleeve fitted to a low alloy steel shaft workers. ГОСТ 3541-57 In addition to the provisions of the manufacture of steel backing roll, but also provides the surface hardness of the roll body. The actual supply of 1450 hot rolling mill and 1200 cold rolling mill backup roller hardness of 40 ~ 60 Shore hardness and has a normalized microstructure. The failure of the backup roll with the cast iron sleeve on the 1450 mill is mostly due to denudation and low working life (see Figure 1, A). This roll is no longer used. 0 Х Φ steel roll failure is mainly due to fracture (44%) and stripping 鉵 (22%), due to natural wear and tear of the roll only 33%. The corrosion of the 80НХЗВ steel roll is more severe (scrap rate of 31%). 9ХΦ steel roll on the 1200 rolling mill destroyed