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A continuous annealing method for hot stamping steel

A technology of hot stamping forming and annealing, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of low production efficiency of surface oxide film, affect the phase change process of workpiece body, affect heat transfer and thermal conductivity, etc., and achieve Good applicability, improved bonding firmness, and good firmness

Active Publication Date: 2019-05-24
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The harmful effects mainly include: 1) Abrasive wear is formed between the mold and the workpiece, which affects the precision and appearance of the workpiece; 2) It causes wear to the mold and reduces the service life of the mold; 3) Induces the cracking of the workpiece body to form a crack source, The quality of the workpiece is hidden; 4) It affects the heat transfer and thermal conductivity, thus affecting the phase change process of the workpiece body
[0004] The steel plate containing Al-Si coating can effectively solve this problem, so that the surface of the steel plate has good oxidation resistance, but its manufacturing cost is higher than that of uncoated steel plate
At present, uncoated cold-rolled steel sheets are mostly produced by the cover-back method, and the oxide film on the surface is not easy to fall off, but the production efficiency is low.

Method used

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  • A continuous annealing method for hot stamping steel
  • A continuous annealing method for hot stamping steel
  • A continuous annealing method for hot stamping steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: The specific process of the continuous annealing method of the hot stamping formed steel is as follows.

[0027] The mass fraction of the chemical composition of the hot stamping forming steel is: C 0.21%, Mn 1.40%, Si 0.30%, S0.006%, P 0.015%, Al 0.035%, Cr 0.20%, B 0.002%, and the rest are iron and unavoidable impurities.

[0028] The continuous annealing process is as follows: 1) Annealing process: the temperature of the uniform temperature section is 780°C, the start temperature of the rapid cooling is 680°C, the end temperature of the rapid cooling is 390°C, the aging end temperature is 360°C, the end temperature of the final cooling section is 150°C, and the temperature after water quenching is 43 ℃. The process speed is 100m / min. The dew point values ​​are +14°C in the heating section, +15°C in the uniform temperature section, and +16°C in the slow cooling section.

[0029] 2) Smoothing process: the smoothing elongation rate is 1.2%, the rolling ...

Embodiment 2

[0031] Embodiment 2: The specific process of the continuous annealing method of the hot stamping formed steel is as follows.

[0032] The mass fraction of the chemical composition of the hot stamping forming steel is: C 0.22%, Mn 1.30%, Si 0.35%, S0.006%, P 0.020%, Al 0.030%, Cr 0.50%, B 0.005%, and the rest are iron and unavoidable impurities.

[0033] The continuous annealing process is as follows: 1) Annealing process: the temperature of the uniform temperature section is 790°C, the start temperature of the rapid cooling is 670°C, the end temperature of the rapid cooling is 400°C, the aging end temperature is 370°C, the end temperature of the final cooling section is 160°C, and the temperature after water quenching is 45°C. ℃. The process speed is 95m / min. The dew point values ​​are +19°C in the heating section, +19°C in the uniform temperature section, and +20°C in the slow cooling section.

[0034] 2) Smoothing process: the smoothing elongation rate is 1.5%, the rollin...

Embodiment 3

[0036] Embodiment 3: The specific process of the continuous annealing method of the hot stamping formed steel is as follows.

[0037] The mass fraction of the chemical composition of the hot stamping forming steel is: C 0.25%, Mn 1.40%, Si 0.18%, S0.005%, P 0.022%, Al 0.050%, Cr 0.30%, B 0.003%, and the rest are iron and unavoidable impurities.

[0038]The continuous annealing process is as follows: 1) Annealing process: the temperature of the uniform temperature section is 800°C, the start temperature of the rapid cooling is 690°C, the end temperature of the rapid cooling is 410°C, the aging end temperature is 380°C, the end temperature of the final cooling section is 150°C, and the temperature after water quenching is 50°C ℃. The process speed is 80m / min. The dew point values ​​are +12°C in the heating section, +13°C in the uniform temperature section, and +15°C in the slow cooling section.

[0039] 2) Smoothing process: the smoothing elongation rate is 2.0%, the rolling ...

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Abstract

The invention discloses a continuous annealing method for hot stamping forming steel. The continuous annealing method comprises an annealing procedure and a leveling procedure, wherein in the annealing procedure, the temperature of an uniform temperature section is 780-800 DEG C, the starting temperature of fast cooling is 670-690 DEG C, the final temperature of fast cooling is 390-410 DEG C, the final temperature of aging is 360-380 DEG C, the end temperature of a final cooling section is 140-160 DEG C, and the temperature after water quenching is 43-50 DEG C. The continuous annealing method is adopted for production, and thus the production efficiency is higher. The method is matched with the dew point in a furnace to produce products, thereby improving the combination firmness of subsequent hot stamping forming scale and a matrix. The method adopts the reasonable leveling process, is matched with a leveling working roller with certain roughness, and controls the surface roughness of band steel, thereby improving the combination firmness of subsequent hot stamping forming scale and the matrix. The scale of the hot stamping forming product produced by the method is not easy to shed off, and the combination firmness of the scale and the matrix is good.

Description

technical field [0001] The invention relates to a heat treatment method for ultra-high-strength steel, in particular to a continuous annealing method for hot stamping forming steel. Background technique [0002] An important way to realize the lightweight of automobiles is to use ultra-high-strength steel, but with the increase of its strength, the formability of the steel plate is significantly reduced, and direct processing is prone to cracking, and the hot stamping forming process solves this problem well. The hot stamping forming process is an advanced manufacturing technology that combines the plastic forming and heat treatment of steel plates, and is specially used to form ultra-high-strength boron steel. Using the hot forming process to manufacture auto parts can make the strength reach 1500MPa. [0003] The general hot stamping forming process is: rapidly heating to about 900°C → out of the furnace → feeding to the stamping station → stamping and cooling → demoulding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/56C21D11/00
CPCC21D9/56C21D11/00
Inventor 齐建群杜雁冰张静孟凡月孟根巴根刘庆永艾兵权张茜赵明月
Owner TANGSHAN IRON & STEEL GROUP
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