A kind of production method of low p, s, ti steel
A production method and technology of steel retention, which is applied in the production of low P, Ti steel by the S, sliding plate slag blocking process, double slag operation in the converter smelting process and steel retention and tapping, can solve the problem of low end temperature and mismatched production capacity , equipment investment and high production costs, to achieve the effect of improving performance
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Embodiment 1
[0024] This example is the actual composition of one furnace for the production of Q345E. The production method is as follows:
[0025] 1) In the early stage, the high-drawing carbon method was adopted, and 10% high-quality scrap steel was used to cool the molten iron, so that the temperature of the molten iron was controlled at 1550°C, and the C at this time was controlled at 0.17%. After the first slag, the C removal rate reached 55%, and the P removal The rate reaches 80%, and the iron removal rate reaches 90%;
[0026] 2) After pouring slag, continue to add slag material, and carry out de-P and de-S in the later stage, so that the temperature of molten steel is 1620°C, and the basicity of slag is 3.5;
[0027]3) After the secondary slag, remove P in the early stage, and remove carbon and S in the later stage. Based on the one after the first slag, the P removal rate reaches 60%, the S removal rate reaches 80%; the Ti removal rate reaches 70%;
[0028] 4) When tapping, ado...
Embodiment 2
[0033] This example is the actual composition of one furnace of A105, the production method is as follows:
[0034] 1) The high carbon method was used in the early stage, and 5% high-quality scrap steel was used to cool the molten iron, so that the temperature of the molten iron was controlled at 1570 °C, and the C at this time was controlled at 0.19%. After the first slag, the removal rate of C reached 50%, and the removal of P The rate reaches 75%, and the deoxidization rate reaches about 95%;
[0035] 2) After pouring slag, continue to add slag material, and carry out de-P and de-S in the later stage, so that the temperature of molten steel is 1600°C, and the basicity of slag is 4.0;
[0036] 3) After the secondary slag, remove P in the early stage, and remove carbon and S in the later stage. Based on the one after the first slag, the P removal rate reaches 70%, the S removal rate reaches 60%; the Ti removal rate reaches 60%;
[0037] 4) When tapping, adopt the process of ...
Embodiment 3
[0042] This example is the actual composition of one furnace of Q345E, the production method is as follows:
[0043] 1) In the early stage, the high-drawing carbon method was adopted, and 8% high-quality scrap steel was used to cool the molten iron, so that the temperature of the molten iron was controlled at 1590°C, and the C at this time was controlled at 0.22%. After the first slag, the removal rate of C reached 60%, and the removal of P The rate reaches 85%, and the iron removal rate reaches 85%;
[0044] 2) After pouring slag, continue to add slag material, and carry out de-P and de-S in the later stage, so that the temperature of molten steel is 1600°C, and the basicity of slag is 8.0;
[0045] 3) After the secondary slag, remove P in the early stage, and remove carbon and S in the later stage. Based on the one after the first slag, the removal rate of P reaches 80%, the removal rate of S reaches 70%; the removal rate of Ti reaches 80%;
[0046] 4) When tapping, the pro...
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