High temperature of roll surface cause burning phenomenon and lower the hardness of roll surface.
辊面高温会产生烧附现象，使辊面的硬度降低。
Therefore, the roll surface is extremely hard and brittle and it is thermally unstable. In addition, it is highly crack sensitive because of the high hardness.
因此，辊子表面有极高的硬度、脆性及热不稳定性。另外，由于高的硬度使之具有高的裂纹敏感性。
When using the utility model, the pass is cast with a blank roll in one body, therefore ensuring surface hardness of the whole pass to be accorded with the surface hardness of the whole roll.
使用本实用新型，由于孔型是与毛坯辊一体铸造出来的，保 证了整个孔型表面的硬度与整个轧辊表面硬度一致。
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