Study On The Controlled Cooling Mechanism And Technology Of Angel Steel

As a kind of steel, the angel steel is section-simple and efficiently economic, and it occupies an important position in the development of national economy. It has been widely used in various aspects such as architecture and engineering.The high strength low alloy structural angel steel is selected for this experiment, The continuous cooling transformation curve of the experimental steel is investigated by Gleeble-3500 thermal simulator, and the temperature distribution situation after rolling is obtained by controlling the cooling process in finite element analysis software of DEFORM. And the conclusions of detection and analysis of mechanical properties is obtained by impact experiment. The specific conclusions are as followings:It can be seen from the CCT curve of test steel that with the increase of cooling rates,the microstructure of the test steel is changing. When the cooling rate is low, the microstructures are mainly polygonal ferritie 、 quasi-polygonal ferritie and a little pearlite. With the cooling rate increasing, the microstructure is changed into a narrow strip of dense bainite and the hardness of the test steel is significantly increased.Combined with the simulation of temperature field distribution and the scene production arrangement, the fluent density is optimal allocated. From the results of the maximum temperature、the lowest temperature and the maximum temperature, the best cooling controlled program is determined to be Wa=6.2L/m2·s, Wb=5L/m2·s,Wc=4.2L/m2·s, Wd=3.2L/m2·s, and the total time is 30 seconds.Based on the optimal solution of the physical simulation of cooling, the impact toughness of different parts for Angle steel. The results of impact experiment shows that the properties of the test steel can be better by controlling the cooling process. The strip bainite ferrite microstructure distributes in random orientation, the microstructure with small size is staggered and interweaved with each other, which can effectively prevent the expansion froom cracking.