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650 MPa-grade steel for automobile wheel and preparation method of 650 MPa-grade steel

A technology for automobiles and wheels, which is applied in the field of 650MPa grade automobile wheel steel and its preparation, can solve the problems of affecting the surface quality of billets, difficult process control, and difficult control of microstructure.

Inactive Publication Date: 2021-04-09
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The steel types mentioned in the above inventions are all dual-phase steels or multi-phase steels, which have the disadvantages of complex production process and difficult microstructure control
CN104981551B discloses a high-strength hot-rolled steel strip or sheet with excellent formability and fatigue properties and a method for producing said steel strip or sheet, using Nb, V composite components, single-phase ferrite In order to ensure the precipitation effect of V, the N content in the steel is controlled relatively high, because N is easy to form inclusions in the steel and affect the surface quality of the billet. , so this invention also has the disadvantage of difficult process control

Method used

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  • 650 MPa-grade steel for automobile wheel and preparation method of 650 MPa-grade steel
  • 650 MPa-grade steel for automobile wheel and preparation method of 650 MPa-grade steel
  • 650 MPa-grade steel for automobile wheel and preparation method of 650 MPa-grade steel

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[0037] The present invention also provides the preparation method of above-mentioned 650MPa level automobile wheel steel, comprises the following steps:

[0038] A) carrying out pre-desulfurization of molten steel smelted in a blast furnace;

[0039] B) performing converter smelting, LF refining and continuous casting on the molten iron obtained in step A) in sequence to obtain a slab;

[0040] C) Heating the slab and then side pressing it, then rolling it, and finally performing laminar flow cooling to obtain 650MPa grade steel for automobile wheels.

[0041] This application first elaborates the smelting method of 650MPa grade automobile wheel steel:

[0042] In the process of smelting, the molten iron is pre-desulfurized first, specifically: the molten iron obtained from blast furnace smelting is pre-desulfurized to control the S content and reduce the level of A-type inclusions, so as to avoid the formation of wheel steel caused by high inclusions. Cracking, S The conten...

Embodiment 1

[0055] (1) Pre-desulfurization of molten iron: pre-desulfurizing the molten iron obtained by blast furnace smelting, the S content is controlled at 0.003wt%;

[0056] (2) Converter smelting: put the above pre-desulfurized molten iron into the converter for smelting, the loaded molten iron weighs 180-250t, 300kg of aluminum and iron is used for deoxidation, manganese is used to mix manganese, and 800-1200kg of active lime is used for desulfurization;

[0057] (3) LF refining: carry out LF refining on the molten steel smelted in the above-mentioned converter, adopt white slag for desulfurization, control the S content to ≤0.005wt%, and desulfurize for 41 minutes;

[0058] (4) Continuous casting: transfer the above-mentioned LF refined molten steel into the tundish for casting, and then pass through the crystallizer to produce cast slabs, put into use dynamic light reduction, and the reduction is controlled to ≥ 3mm, and the secondary cooling water adopts weak cooling mode , the ...

Embodiment 2

[0062] (1) Pre-desulfurization of molten iron: pre-desulfurizing the molten iron obtained by blast furnace smelting, the S content is controlled at 0.003wt%;

[0063] (2) Converter smelting: put the above-mentioned pre-desulfurized molten iron into the converter for smelting, the weight of the charged molten iron is 180-250t, and 290kg of aluminum and iron are used for deoxidation, manganese is used to mix manganese, and 800-1200kg of active lime is used for desulfurization;

[0064] (3) LF refining: carry out LF refining on the above-mentioned molten steel smelted in the converter, adopt white slag to desulfurize, control the S content to ≤0.003wt%, and desulfurize for 36 minutes;

[0065] (4) Continuous casting: transfer the above-mentioned LF refined molten steel into the tundish for casting, and then pass through the crystallizer to produce cast slabs, put into use dynamic light reduction, and the reduction is controlled to ≥ 3mm, and the secondary cooling water adopts weak...

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Abstract

The invention provides 650 MPa-grade steel for an automobile wheel. The 650 MPa-grade steel comprises 0.05 wt%-0.12 wt% of C, 1.00 wt%-2.00 wt% of Mn, 0.05 wt%-0.30 wt% of Si, 0.04 wt%-0.07 wt% of Nb, 0.02 wt%-0.05 wt% of Ti, 0.01 wt%-0.06 wt% of Als, less than or equal to 0.020 wt% of P, less than or equal to 0.010 wt% of S and the balance Fe. The invention further provides a preparation method of the 650 MPa-grade steel for the automobile wheel. According to the 650MPa-grade steel for the automobile wheel, Nb microalloying is adopted, the strength and the toughness are improved through fine grain strengthening and precipitation strengthening, the number and the size of Nb precipitates are stable, and therefore the mechanical property stability of the 650MPa-grade steel is good; and meanwhile, the metallographic structure of the steel is superfine ferrite and trace pearlite and contains fine dispersed precipitated phases, and the structure has the characteristics of good forming and welding performance.

Description

technical field [0001] The invention relates to hot continuous rolling steel for automobile wheels, in particular to a 650MPa grade steel for automobile wheels and a preparation method thereof. Background technique [0002] In the situation of increasing automobile production and ownership, increasing automobile energy consumption and harmful gas emissions, reducing the quality of automobiles is the most effective measure for energy conservation and environmental protection. Relevant foreign experimental data show that reducing the weight of the vehicle itself by 10% can reduce fuel consumption by 5% to 8%. Therefore, under the premise of ensuring the overall strength and reliability of the car, the high strength and light weight of the car body is one of the important ways to achieve energy saving and emission reduction. [0003] In order to adapt to the development trend of automobile lightweight, the performance characteristics of the new high-strength wheel steel plate ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/06C22C33/06C21C7/064C21C7/10C21D8/02
CPCC22C38/04C22C38/02C22C38/12C22C38/14C22C38/06C22C33/06C21C7/064C21C7/10C21D8/0205C21D8/0226C21D2211/005
Inventor 熊雪刚张开华李正荣崔凯禹
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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