Method for producing 700MPa-grade high-strength steel by enabling precipitated phase particles to be fine and dispersed
A technology of precipitated phase and high-strength steel, which is applied in the direction of temperature control, etc., can solve the problems of precipitated phase and impurity phase mixing and agglomeration, and the inability to exert the effect of dispersion strengthening, so as to achieve the effect of suppressing the problem of compound agglomeration, good strengthening effect, and good comprehensive performance
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Embodiment 1
[0025] Embodiment 1: A kind of method that makes precipitated phase particles fine and dispersed and then produces 700MPa grade high-strength steel, comprises the following steps:
[0026] In the first step, during the smelting process, control the basicity of the slag in the converter to 2.3, and the carbon content at the end point is 0.08wt%. When 1 / 4 of the steel is tapped, start to add silicon-manganese alloy, high-carbon ferrochrome, vanadium-nitrogen alloy and carburization 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 is Fe and unavoidable trace impurities;
[0027] The second step, LF refining, the refining time T is 30 minutes, and the white slag retention time is 11 minutes;
[0028] The third step is to continuously cast the molten steel refined in the second step to make a billet. In the continuous casting process, the t...
Embodiment 2
[0033] Embodiment 2: A kind of method that makes precipitated phase particles fine and dispersed and then produces 700MPa grade high-strength steel, comprises the following steps:
[0034]In the first step, during the smelting process, control the basicity of the slag in the converter to 2.3, and the carbon content at the end point is 0.08wt%. When 1 / 4 of the steel is tapped, start to add silicon-manganese alloy, high-carbon ferrochrome, vanadium-nitrogen alloy and carburization 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 is Fe and unavoidable trace impurities;
[0035] The second step, LF refining, the refining time T is 35 minutes, and the white slag retention time is 11 minutes;
[0036] The third step is to continuously cast the molten steel refined in the second step to make a billet. In the continuous casting process, the te...
Embodiment 3
[0041] Embodiment 3: A kind of method that makes precipitated phase particles fine and dispersed and then produces 700MPa grade high-strength steel, comprises the following steps:
[0042] In the first step, during the smelting process, control the basicity of the slag in the converter to 2.3, and the carbon content at the end point is 0.08wt%. When 1 / 4 of the steel is tapped, start to add silicon-manganese alloy, high-carbon ferrochrome, vanadium-nitrogen alloy and carburization 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 is Fe and unavoidable trace impurities;
[0043] The second step, LF refining, the refining time T is 40 minutes, and the white slag retention time is 11 minutes;
[0044] The third step is to continuously cast the molten steel refined in the second step to make a billet. In the continuous casting process, the t...
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