Non quenched and tempered steel and manufacturing process thereof
a technology of tempered steel and quenching process, which is applied in the field of non-quenching and tempered steel, can solve the problems of high cost of quenching and tempering process, low efficiency of manufacturing process, and inability to meet energy-saving and environmental protection requirements at presen
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example 1
[0044]This example provides a process of producing non quenched and tempered steel, comprising a finish rolling step and a cooling step after the finish rolling, wherein, in the finish rolling step, the temperature of rods at the entry into the finish rolling step was controlled at ≦950° C.; the rods were subjected to low temperature rolling when the rods temperature is 850° C.-900° C. After the rolling, the steel was subjected to three stages of water cooling by means of a specialized controllable water cooling unit, wherein the first stage of water cooling employed intense cooling, the second stage of water cooling employed moderate cooling, and the third stage of water cooling employed intense cooling.
[0045]Here, it should be noted that there are many ways to control water cooling intensity. In this example, the water flow was controlled by controlling the opening degree of the valve(s) of water cooling unit so as to control water cooling strength. Specifically, the first stage v...
example 2
[0047]This example provides a process of producing non quenched and tempered steel, which was a further improvement over Example 1. As compared with Example 1, this process further comprises a smelting step before the finish rolling step, the smelting step comprising electric furnace smelting step, ladle furnace smelting and refining step carried out sequentially.
[0048]In the electric furnace smelting step, molten iron smelting was employed, the phosphorus content before steel tapping was strictly controlled at ≦0.015%, the final carbon content was 0.03% to 0.10%, and the final temperature was 1620° C.-1700° C. The electric furnace smelting can better control deslagging operation than traditional converter smelting.
[0049]In the ladle furnace (LF) smelting step, deoxidization was performed using silicon carbide, ferrosilicon powder; lime was added to make white slag; the white slag was held for 20 minutes or more so that the inclusions can be thoroughly removed by the white slag.
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example 3
[0052]This example provides a process for producing non quenched and tempered steel, which was a further improvement over Example 1 or 2. In this example, the continuous casting step and heating step were improved. The continuous casting step and the heating step were arranged after the refining step, and before the rolling step and the water cooling step.
[0053]In the continuous casting step, molten iron in a tundish was introduced into a crystallizer by a submerged nozzle, thus the problem that air tends to be brought in when using traditional nozzles is avoided. Furthermore, argon gas was blow to the joint site of the submerged nozzle and the tundish, thus preventing air from entering into the tundish. The overheat was strictly controlled at 20-35° C., and the pulling speed was controlled at 0.5 m / min-0.6 m / min. In the continuous casting, low overheat and low casting speed ensured the quality of casting blank. When cutting after continuous casting, the temperature at cut place was...
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