结果表明，奥氏体的再结晶发生在钢的正常淬火温度以上的一个温度范围，并在该范围内存在晶粒细化效果最佳的温度区域；
The results showed that the austenite recrystallization occurs in a temperature range biger than thenormal quenching temperature and there is an optimum temperature range for the grain refining.
研究结果表明，冷却强度是晶粒细化的最主要因素，极差为57.946，可信度达到99%，其次是保温时间与浇注温度。
The results indicate, the main factor for grain refinement is cooling intensity, its polar odds is 57.946 and reliability is 99%. The next facts are preservation time and pouring temperature.
金相试验表明，适当降低轧制温度有利于晶粒的细化，从而改善钢材的力学性能。
Metallographic experiment indicate that reducing the rolling temperature properly is propitious to thin crystal, consequently the mechanical performance of steel products is also improved.
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