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1. Affect the melt flow rate and the cooling speed.

2. The influence of heating temperature, forging-ending temperature and cooling speed on the mechanical properties of untempered 45V steel is investigated.

3. After steel parts are welded, the cooling speed directly affects the quality of welding.

4. Fast cooling speed was the main reason of generating cold crackle.

5. The grain boundary segregation becomes more severe when the cooling speed is increased.

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6. In transient rheological aspect, apparent viscosity increases more evident with the increment of cooling speed.

7. Using a high frequency induction furnace, the effects of brazing temperature ( T ), brazing time ( t ) and cooling speed ( v ) on microstructure and property of white cast iron have been studied.

8. The cooling in gradient method was applied, the uneven cooling speed was avoided.

9. The expanding curves and continuous cooling transformation curve (dynamic CCT curve) of X60 pipeline steel were obtained by dilatometry and microscopic test under different cooling speed.

10. The selection of pickling solution, time and temperature are expatiated, and the control of heat preservation, heating and cooling speed for vacuum annealing are studied.

11. The heated temperature, the final forging temperature and the cooling speed are the important factors which influence the performance of untempered steel.