Causes of influenting guide - rail heat treatment quality are expounded, including chemical composition and primary tissue of raw material, martensitic phase transformation plasticity, residual austenite, inverse hardening of bearing stell quenching as well as process operation in quenching and tempering and so on. By production practice, proper heat treatment process is laid down and heat treatment quality of guiderail is effectively controlled.
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After reconstruction the effectiveness was good proved by production practice for several years.
经改造后几年的生产实践证明，效果很好。
The simulation results are validated by production practice. The material utilization rate improves from 59.29% to 69.04%.
生产实践验证了该环坯设计方案的可行性，优化环坯尺寸后材料利用率从59.29%提高到69.04%。
Some prevention methods were proposed from two aspects of structural design and casting processing which has been verified by production practice.
并从结构设计及铸造工艺设计两方面提出了防止球铁井盖上表面缩凹的措施，这些方法在生产实践中已得到检验。
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