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用作轧制钢板的硬面铸铁轨辊,不仅要求具有足够的冷硬深度和硬度,并且要求具有很好的强度.但用普通冷铸方法铸造的硬面轧辊由于铸造时自然结晶条件的限制,冶硬层的白口部分和麻口部分的深度形成一定的比例.冶硬层较深的轧辊往往很脆,使用时极易折断;冷硬层较浅的轧辊虽然强度较高,不致断辊,但使用次数却因而减少,也会缩短轧辊使用寿命(见图1).
The hard cast iron rail roll used as a rolled steel sheet is not only required to have sufficient chill depth and hardness but also to have good strength, but the hard-surfaced rolls cast by conventional cold-casting methods are limited by natural crystallization conditions during casting , The metallurgical layer of the white part of the mouth and part of the depth of the formation of a certain proportion of Ma. The deeper the hard layer of the roller is often very brittle, easy to break when used; chilled layer of the higher the strength of the roller, not broken Roller, but the use of the number is reduced, will also shorten the life of the roll (see Figure 1).