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Hot-rolled dual-phase steel for automobile wheel and production method of hot-rolled dual-phase steel

A hot-rolled dual-phase steel and production method technology, applied in the field of dual-phase steel, can solve the problems of inability to guarantee surface quality, inability to realize precise control of cooling process, high cost of hot-rolled dual-phase steel, and achieve excellent performance and surface quality, The effect of thin gauge and reduction of raw material cost

Inactive Publication Date: 2018-03-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems of the high cost of hot-rolled dual-phase steel in the prior art, the inability of the existing hot-rolling production method to realize precise control of the cooling process, and the inability to ensure good surface quality.

Method used

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  • Hot-rolled dual-phase steel for automobile wheel and production method of hot-rolled dual-phase steel
  • Hot-rolled dual-phase steel for automobile wheel and production method of hot-rolled dual-phase steel

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Experimental program
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Effect test

Embodiment 1

[0031] The hot-rolled dual-phase steel for automobile wheels in this embodiment has the following chemical composition by mass percentage: C: 0.05%, Si: 0.15%, Mn: 1.22%, Cr: 0.50%, P: 0.045%, S: 0.003%, the balance is Fe and unavoidable impurities.

[0032] The above-mentioned hot-rolled dual-phase steel for automobile wheels is prepared by the following method:

[0033] (1) Continuous casting: heat the continuous casting slab with a thickness of 230mm, control the heating temperature to 1300°C, the heating time to 150min, and the furnace temperature to 1220°C. The chemical composition of the continuous casting slab is: C: 0.05%, Si: 0.15 %, Mn: 1.22%, Cr: 0.50%, P: 0.045%, S: 0.003%, the balance is Fe and unavoidable impurities;

[0034] (2) Hot rolling: rolling the continuous casting slab, controlling the exit temperature of rough rolling to 1100°C, the entrance temperature of finish rolling to 1070°C, the finish rolling temperature to 800°C, and the constant rolling speed...

Embodiment 2

[0039]The hot-rolled dual-phase steel for automobile wheels in this embodiment has a chemical composition of C: 0.06%, Si: 0.18%, Mn: 1.25%, Cr: 0.54%, P: 0.040%, and S: 0.004 by mass percentage. %, the balance is Fe and unavoidable impurities.

[0040] The above-mentioned hot-rolled dual-phase steel for automobile wheels is prepared by the following method:

[0041] (1) Continuous casting: heat the continuous casting slab with a thickness of 230mm, control the heating temperature to 1300°C, the heating time to 150min, and the furnace temperature to 1240°C. The components of the continuous casting slab are: C: 0.06%, Si: 0.19%, Mn: 1.25%, Cr: 0.54%, P: 0.039%, S: 0.004%, the balance is Fe and unavoidable impurities;

[0042] (2) Hot rolling: rolling the continuous casting slab, controlling the exit temperature of rough rolling to 1100°C, the entrance temperature of finish rolling to 1070°C, the finish rolling temperature to 810°C, and the constant rolling speed to 5.8m / s;

...

Embodiment 3

[0047] The hot-rolled dual-phase steel for automobile wheels in this embodiment has a chemical composition of C: 0.08%, Si: 0.16%, Mn: 1.29%, Cr: 0.53%, P: 0.043%, and S: 0.003 by mass percentage. %, the balance is Fe and unavoidable impurities.

[0048] The above-mentioned hot-rolled dual-phase steel for automobile wheels is prepared by the following method:

[0049] (1) Continuous casting: heat the continuous casting slab with a thickness of 230mm, control the heating temperature to 1300°C, the heating time to 150min, and the furnace temperature to 1230°C. The components of the continuous casting slab are: C: 0.08%, Si: 0.16%, Mn: 1.29%, Cr: 0.53%, P: 0.043%, S: 0.003%, the balance is Fe and unavoidable impurities;

[0050] (2) Hot rolling: rolling the continuous casting slab, controlling the exit temperature of rough rolling to 1100°C, the entrance temperature of finish rolling to 1060°C, the finish rolling temperature to 820°C, and the rolling speed to 5.3m / s;

[0051] (...

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Abstract

The invention discloses hot-rolled dual-phase steel for an automobile wheel and a production method of the hot-rolled dual-phase steel, and belongs to the technical field of dual-phase steel. The technical problems that in the prior art, the cost of hot-rolled dual-phase steel is high, accurate control over the cooling process cannot be achieved through an existing hot continuous rolling production method, and good surface quality cannot be guaranteed are solved. The hot-rolled dual-phase steel for the automobile wheel comprises, by mass percent, 0.05%-0.10% of C, 0.10%-0.25% of Si, 1.20%-1.40% of Mn, 0.50%-0.60% of Cr, 0.035%-0.070% of P, not larger than 0.010% of S and the balance Fe and inevitable impurities. According to the hot-rolled dual-phase steel, a low-silicon molybdenum-free Mn-Cr-P component system is adopted, and the surface quality problem brought by high silicon is solved; through control over the primary cooling temperature, the air cooling time and the secondary cooling speed and temperature, accurate control over the yield strength, the tensile strength and the dual-phase structure of the steel is achieved; and the hot-rolled dual-phase steel is low in cost and excellent in performance and surface quality.

Description

technical field [0001] The invention belongs to the technical field of dual-phase steel, in particular to a hot-rolled dual-phase steel for automobile wheels and a production method thereof. Background technique [0002] Since the advent of dual-phase steel in the 1960s, it was developed in my country in the 1980s, but it was not popularized and applied until recent years. Because of its good strong-plastic fit, low yield ratio, high elongation and n-value, and no yield platform, it is easy to process and form, and at the same time has less loss to the mold, etc. Quantification plays an important role. [0003] Hot-rolled dual-phase steel is mainly divided into two types: low-temperature coiling type and medium-temperature coiling type. The low-temperature coiled hot-rolled dual-phase steel completes the transformation of the main martensitic structure after low-temperature coiling. This type of hot-rolled dual-phase steel has relatively small alloy content and low alloy c...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/02C22C38/04C22C38/18
CPCC22C38/02C21D8/005C21D2211/005C21D2211/008C22C38/04C22C38/18
Inventor 吴菊环肖尧徐权张开华左军周伟
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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