A method for finely dispersing precipitation phase particles to produce 700mpa grade high-strength steel
A technology of precipitation and high-strength steel, applied in temperature control and other directions, can solve the problems of inability to exert dispersion strengthening effect, the mixed agglomeration of precipitation and impurity phases, etc., to achieve good strengthening effect, inhibition of chemical agglomeration, and comprehensive performance.
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Embodiment 1
[0025] Embodiment 1: a method for finely dispersing precipitated phase particles to produce 700MPa grade high-strength steel, comprising the following steps:
[0026] The first step, during the smelting process, control the basicity of the slag of the converter to be 2.3, and the carbon content at the end point to be 0.08wt%. When 1 / 4 of the steel is tapped, silicon-manganese alloy, high-carbon ferrochromium, vanadium-nitrogen alloy and carbon increase are added. The chemical composition and mass percentage of the molten steel smelted in the converter are: C: 0.25%, Si: 0.89%, Mn : 1.63%, P: 0.010%, S: 0.025%, V: 0.115%, Cr: 0.20%, N: 0.018%, the rest are Fe and inevitable trace impurities;
[0027] The second step, LF refining, the refining time T is 30min, and the white slag retention time is 11min;
[0028] The third step is to continuously cast the molten steel refined in the second step into a billet. In the continuous casting process, the temperature of the molten steel...
Embodiment 2
[0033] Embodiment 2: a method for finely dispersing precipitated phase particles to produce 700MPa grade high-strength steel, comprising the following steps:
[0034]The first step, during the smelting process, control the basicity of the slag in the converter to be 2.3, and the carbon content at the end point to be 0.08wt%. When 1 / 4 of the steel is tapped, silicon-manganese alloy, high-carbon ferrochromium, vanadium-nitrogen alloy and carbon increase are added. The chemical composition and mass percentage of the molten steel smelted in the converter are: C: 0.05%, Si: 0.82%, Mn : 1.68%, P: 0.015%, S: 0.010%, V: 0.185%, Cr: 0.05%, N: 0.028%, the rest are Fe and inevitable trace impurities;
[0035] The second step, LF refining, the refining time T is 35min, and the white slag retention time is 11min;
[0036] The third step is to continuously cast the molten steel refined in the second step into a billet. In the continuous casting process, the temperature of the molten steel ...
Embodiment 3
[0041] Embodiment 3: a method for finely dispersing precipitation phase particles to produce 700MPa grade high-strength steel, comprising the following steps:
[0042] The first step, during the smelting process, control the basicity of the slag in the converter to be 2.3, and the carbon content at the end point to be 0.08wt%. When 1 / 4 of the steel is tapped, silicon-manganese alloy, high-carbon ferrochromium, vanadium-nitrogen alloy and carbon increase are added. The chemical composition and mass percentage of the molten steel smelted in the converter are: C: 0.35%, Si: 0.92%, Mn : 1.73%, P: 0.025%, S: 0.015%, V: 0.175%, Cr: 0.25%, N: 0.025%, the rest are Fe and inevitable trace impurities;
[0043] The second step, LF refining, the refining time T is 40min, and the white slag retention time is 11min;
[0044] The third step is to continuously cast the molten steel refined in the second step into a billet. In the continuous casting process, the temperature of the molten stee...
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