Rapid water cooling device for hot-rolled ribbed s

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Rapid water cooling device for hot-rolled ribbed steel microstructure and properties of

Any restrictions. Spread to the outer layer of the inner temperature, while the outer layer of high temperature, making it easier for the outer layer of grain growth, lowering the temperature of the inner layer is very slow. Therefore, the inner and outer layers faster than the rate of grain growth. Rapid cooling after rolling the sample, because after the water, from the inside out to a large extent inhibited the growth of grains. After controlled cooling, the outer temperature is very low, the trend of grain growth is inhibited. Meanwhile, the inner to the outer temperature also accelerated the rate of diffusion,[link widoczny dla zalogowanych], the corresponding inner accelerated cooling, the inner layer of the grain growth has also been a certain degree of inhibition. Therefore, the trend of inner and outer layers of grain growth is relatively slow. 2.2 The rapid cooling after rolling on the temperature parameters and mechanical properties of Table 2 is 12mm400MPa grade hot-rolled ribbed steel bars for the industrial test data obtained. 4214 and 4220 batch data group air cooling after rolling, the rest is water cooling after rolling data. As can be seen from the data, from the rolled steel to the cooling bed, after a rapid cooling after rolling is a cooling process. Rapid cooling after rolling the steel, cooling rate of the Chinese and the temperature of the rolled steel and cold-water pressure control decisions. The higher the temperature in the steel after rolling, controlled cooling of the pressure the higher the temperature the greater the range. Temperature on the cooling bed reinforced a great impact on the yield strength, reinforced the lower the temperature on the cooling bed (the greater the cooling rate), the greater the yield strength of steel. On the other hand, from the mechanical properties of steel can be seen that the influence of temperature on the tensile strength far less significant effect on the yield strength, steel temperature on the cooling bed, the yield strength will be significantly reduced, but the magnitude of the tensile strength decreased will be smaller. Yield strength and tensile strength with the steel on the cooling bed significantly reduced the increase of temperature, elongation and strong bend on the cooling bed than are reinforced with the temperature increased. l5 of Wang Chunrong: rapid water cooling device for hot-rolled ribbed steel microstructure and properties of 44 694 Conclusion (1) rapid water cooling device can adjust the pressure of cooling water, rapid cooling effect is obvious. Compared with conventional water-cooled unit, with rolling cooling rate, simple structure, easy adjustment and so on. (2) rapid cooling after rolling, you can significantly reduce hot-rolled ribbed steel bars on cooling bed temperature, while refining the ferrite grain size, inhibit grain growth, thereby improving the mechanical properties of steel, the yield strength of steel can be increase (3O a 5O) MPa, lower costs per ton of steel can be about 40.