Alloying and smelting method of vanadium-containing titanium steel for automobile

Abstract

The invention relates to the technical field of steel smelting, and particularly discloses an automobile vanadium-titanium-containing steel alloying smelting method. The method at least comprises thefollowing steps that part of vanadium-titanium-containing molten iron is poured into a steel ladle filled with a desulfurizing agent and a dephosphorizing agent; the rest vanadium-titanium-containingmolten iron continues being smelted by a converter to obtain finishing molten steel, the molten steel is subjected to tapping and poured into the steel ladle to be mixed with the vanadium-titanium-containing molten iron, mixed molten steel is obtained, and in addition, in the finishing molten steel tapping process, the steel ladle is subjected to bottom blowing CO and N2 mixed gas stirring; and the mixed molten steel is refined through an LF, and molten steel of vanadium-titanium-containing steel is obtained. According to the method, through the smelting method that the vanadium-titanium-containing steel for an automobile is directly alloyed, the vanadium-titanium-containing molten iron is maxed with the molten steel smelted by the converter, the effect that the automobile vanadium-titanium-containing steel is subjected to vanadium and titanium alloying through the element vanadium and the element titanium in the vanadium-titanium-containing molten iron is achieved, and the automobilevanadium-titanium-containing steel alloying cost can be remarkably reduced.

Description

technical field

[0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for alloying and smelting vanadium-containing titanium steel for automobiles. Background technique

[0002] As the world's largest automobile producer, the rapid development of the automobile industry has brought huge development space to my country's steel industry, and at the same time put forward new requirements for automobile lightweight and green environmental protection. Practice has shown that one of the most effective, reliable, and cost-effective ways to achieve lightweight automobiles is to increase the application ratio of advanced high-strength steel and ultra-high-strength steel in automobiles, and to achieve lightweight bodywork by thinning the structure and optimizing the structure of parts. However, with the increase in the strength of advanced high-strength steel for automobiles, the ductility of the material decreases and the springback...

Examples

Embodiment 1

[0036] Reference attached figure 1 The flow chart of the embodiment of the present invention provides a method for alloying and smelting vanadium-containing titanium steel for automobiles, comprising the following steps:

[0037] Step a, place 20kg bagged desulfurizer and 40kg bagged dephosphorizer on the bottom of the empty ladle;

[0038] Step b. Pour 13 tons of vanadium-titanium molten iron into a ladle with desulfurizer and dephosphorization agent, and transport it to the converter taphole for standby; wherein, the chemical composition weight percentage of the vanadium-titanium molten iron is as follows: C: 4.0%, V: 0.22%, Ti: 0.15%, P: 0.05%, S: 0.04%, the rest is iron and unavoidable impurities, the temperature is 1310°C;

[0039] Step c, continue to smelt the remaining vanadium-titanium-containing molten iron through the converter, regardless of the vanadium extraction effect, control the chemical composition weight percentage of the molten steel composition at the end...

Embodiment 2

[0043] Reference attached figure 1 The flow chart of the embodiment of the present invention provides a method for alloying and smelting vanadium-containing titanium steel for automobiles, comprising the following steps:

[0044] Step a, place 50kg bagged desulfurizer and 80kg bagged dephosphorizer on the bottom of the empty ladle;

[0045] Step b. Pour 17 tons of vanadium-titanium molten iron into a ladle with desulfurizer and dephosphorization agent, and transport it to the converter taphole for standby; wherein, the chemical composition weight percentage of the vanadium-titanium molten iron is as follows: C: 4.6%, V : 0.30%, Ti: 0.3%, P: 0.068%, S: 0.057%, the rest is iron and unavoidable impurities, the temperature is 1390 ℃;

[0046] Step c, continue to smelt the remaining vanadium-titanium-containing molten iron through the converter, regardless of the vanadium extraction effect, control the chemical composition weight percentage of the molten steel composition at the e...

Embodiment 3

[0050] Reference attached figure 1 The flow chart of the embodiment of the present invention provides a method for alloying and smelting vanadium-containing titanium steel for automobiles, comprising the following steps:

[0051] Step a, place 35kg bagged desulfurizer and 60kg bagged dephosphorizer on the bottom of the empty ladle;

[0052] Step b. Pour 15 tons of vanadium-titanium molten iron into a ladle with desulfurizer and dephosphorization agent, and transport it to the converter taphole for standby; wherein, the chemical composition weight percentage of the vanadium-titanium molten iron is as follows: C: 4.3%, V : 0.26%, Ti: 0.22%, P: 0.06%, S: 0.05%, the rest is iron and unavoidable impurities, the temperature is 1350 ℃;

[0053] Step c, continue to smelt the remaining vanadium-titanium-containing molten iron through the converter, regardless of the vanadium extraction effect, control the chemical composition weight percentage of the molten steel composition at the en...

technical field

[0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for alloying and smelting vanadium-containing titanium steel for automobiles. Background technique

[0002] As the world's largest automobile producer, the rapid development of the automobile industry has brought huge development space to my country's steel industry, and at the same time put forward new requirements for automobile lightweight and green environmental protection. Practice has shown that one of the most effective, reliable, and cost-effective ways to achieve lightweight automobiles is to increase the application ratio of advanced high-strength steel and ultra-high-strength steel in automobiles, and to achieve lightweight bodywork by thinning the structure and optimizing the structure of parts. However, with the increase in the strength of advanced high-strength steel for automobiles, the ductility of the material decreases and the springback...

Examples

Embodiment 1

[0036] Reference attached figure 1 The flow chart of the embodiment of the present invention provides a method for alloying and smelting vanadium-containing titanium steel for automobiles, comprising the following steps:

[0037] Step a, place 20kg bagged desulfurizer and 40kg bagged dephosphorizer on the bottom of the empty ladle;

[0038] Step b. Pour 13 tons of vanadium-titanium molten iron into a ladle with desulfurizer and dephosphorization agent, and transport it to the converter taphole for standby; wherein, the chemical composition weight percentage of the vanadium-titanium molten iron is as follows: C: 4.0%, V: 0.22%, Ti: 0.15%, P: 0.05%, S: 0.04%, the rest is iron and unavoidable impurities, the temperature is 1310°C;

[0039] Step c, continue to smelt the remaining vanadium-titanium-containing molten iron through the converter, regardless of the vanadium extraction effect, control the chemical composition weight percentage of the molten steel composition at the end...

Embodiment 2

[0043] Reference attached figure 1 The flow chart of the embodiment of the present invention provides a method for alloying and smelting vanadium-containing titanium steel for automobiles, comprising the following steps:

[0044] Step a, place 50kg bagged desulfurizer and 80kg bagged dephosphorizer on the bottom of the empty ladle;

[0045] Step b. Pour 17 tons of vanadium-titanium molten iron into a ladle with desulfurizer and dephosphorization agent, and transport it to the converter taphole for standby; wherein, the chemical composition weight percentage of the vanadium-titanium molten iron is as follows: C: 4.6%, V : 0.30%, Ti: 0.3%, P: 0.068%, S: 0.057%, the rest is iron and unavoidable impurities, the temperature is 1390 ℃;

[0046] Step c, continue to smelt the remaining vanadium-titanium-containing molten iron through the converter, regardless of the vanadium extraction effect, control the chemical composition weight percentage of the molten steel composition at the e...

Embodiment 3

[0050] Reference attached figure 1 The flow chart of the embodiment of the present invention provides a method for alloying and smelting vanadium-containing titanium steel for automobiles, comprising the following steps:

[0051] Step a, place 35kg bagged desulfurizer and 60kg bagged dephosphorizer on the bottom of the empty ladle;

[0052] Step b. Pour 15 tons of vanadium-titanium molten iron into a ladle with desulfurizer and dephosphorization agent, and transport it to the converter taphole for standby; wherein, the chemical composition weight percentage of the vanadium-titanium molten iron is as follows: C: 4.3%, V : 0.26%, Ti: 0.22%, P: 0.06%, S: 0.05%, the rest is iron and unavoidable impurities, the temperature is 1350 ℃;

[0053] Step c, continue to smelt the remaining vanadium-titanium-containing molten iron through the converter, regardless of the vanadium extraction effect, control the chemical composition weight percentage of the molten steel composition at the en...

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