Aerial fog cooling process method of hot rolling bar

Abstract

The invention relates to an aerial fog cooling process method of hot rolling bars. According to the aerial fog cooling process method, the hot rolling bars are cooled by using a control cooling system; the control cooling system comprises a control cooling device, a water supply system and a gas supply system; before the bars are produced, the water supply system and the gas supply system are started, the water supply system and the gas supply system are respectively used for providing compressed air and high pressure cooling water to the control cooling device through a water inlet pipe and a gas inlet pipe; the compressed air and the high pressure cooling water are converted and mixed into high pressure aerial fog which enters a box body through an aerial fog joint; when the bars are produced, the hot rolling bars rolled by a finished product rack are conveyed through a rolling line so as to enter the control cooling device to be subjected to aerial fog cooling; and the bars subjected to aerial fog cooling subsequently enter a cooling bed so as to be subjected to air cooling to room temperature. By utilizing the aerial fog cooling process method of the hot rolling bars, the phenomenon that bubbles are formed on the surfaces of the bars is prevented, the surface quality of the bars is improved, the surface texture grains of the bars are refined, and the improvement of the comprehensive mechanical properties of the bars are facilitated.

Description

technical field [0001] The invention relates to a gas mist cooling process method for hot-rolled bars, and belongs to the technical field of bar production cooling processes. Background technique [0002] At present, in the production of bars in the metallurgical industry, the process link of controlled cooling is very important. The post-rolling cooling technology routes of hot-rolled bars at home and abroad generally adopt two types: non-piercing water cooling after rolling (post-rolling air cooling) and post-rolling water cooling. For the air-cooling process after hot-rolled bars, if the final rolling temperature is too high and the temperature of the cooling bed on the bar is too high, the final phase transformation will result in a coarse grain structure, the strength of the bar will decrease, and the surface of the bar will be easily Foaming affects the surface quality of the bar. For the water cooling process after rolling, the martensite, bainite, sorbite and other...

AI Technical Summary

Problems solved by technology

For the air-cooling process after hot-rolled bars, if the final rolling temperature is too high and the temperature of the cooling bed on the bar is too high, the final phase transformation will result in a coarse grain structure, the strength of the bar will decrease, and the surface of the bar will be easily Blistering affects the surface quality of the bar

For the water cooling process after rolling, the martensite, bainite, sorbite and other structures formed on the surface of the bar are not conducive to the welding of the bar, and the surface of the bar is easy to rust, which affects the surface quality of the bar

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