Low-carbon aluminium killed steel with excellent stamping properties and production method of low-carbon aluminium killed steel

A technology of low-carbon aluminum-killed steel and production method, which is applied to low-carbon aluminum-killed steel with excellent stamping performance and its production field, and can solve the problems of poor coating adhesion, poor stamping performance, and low plastic strain ratio, etc. Achieve the effects of reducing strength, improving plasticity, and excellent stamping performance

Inactive Publication Date: 2015-01-07
HEBEI IRON AND STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Si content in the existing low-carbon Al-killed steel is generally less than 0.03%, partly because of the consideration of the subsequent coating process, because the Si content above 0.03% will lead to poor adhesion of the coating
The traditional process of producing this type of steel is converter steelmaking→LF furnace refining→continuous casting hot rolling→cold rolling→annealing. In order to improve the castability of molten steel, calcium treatment is carried out in the LF furnace process, but the LF furnace treatment is adopted, and the finished product The carbon content is high, generally between 0.03 and 0.06%, so the plastic strain ratio (r90) is low, and the stamping performance is not good

Method used

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  • Low-carbon aluminium killed steel with excellent stamping properties and production method of low-carbon aluminium killed steel
  • Low-carbon aluminium killed steel with excellent stamping properties and production method of low-carbon aluminium killed steel
  • Low-carbon aluminium killed steel with excellent stamping properties and production method of low-carbon aluminium killed steel

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: The low-carbon aluminum-killed steel with excellent stamping performance is produced by the following specific process.

[0016] The production process of the low-carbon aluminum-killed steel is: converter steelmaking→RH refining→continuous casting hot rolling→cold rolling→annealing. In the traditional design, due to the low content of Si in the converter blowing finished product, there will be no deterioration in the formability of the finished product. The content of Si in this steel is relatively high. Therefore, RH refining is used and calcium-containing ferrosilicon is added to RH to realize the alloying of silicon and the denaturation treatment of inclusions, that is, calcium treatment, so as to improve castability and stabilize the production process; And the vacuum treatment of RH refining can achieve low carbon content (the finished products are all below 0.010%).

[0017] The thickness of the continuous casting slab is 150mm, the composition (wt...

Embodiment 2

[0021] Example 2: The low-carbon aluminum-killed steel with excellent stamping performance is produced by the following specific process.

[0022] The thickness of the continuous casting slab is 150mm, and the composition is: C 0.0053%, Mn 0.09%, S 0.008%, P 0.018%, Si 0.09%, N 30ppm, Als 0.060%, Ca 9ppm, and the balance is Fe and unavoidable impurities. Hot rolling process: the final rolling temperature is 910°C, the hot rolling reduction is 98%, and the coiling temperature is 590°C. The reduction in the cold rolling process was 75%. Bell annealing process: the heating rate is 80°C / hour, the mask annealing temperature is 630 / 690°C, and the holding time is 6 hours.

[0023] After testing, the properties of the low-carbon aluminum-killed steel obtained in this embodiment are shown in Table 2.

[0024] Table 2: Properties of the low-carbon aluminum-killed steel obtained in Example 2

[0025]

Embodiment 3

[0026] Embodiment 3: The low-carbon aluminum-killed steel with excellent stamping performance is produced by the following specific process.

[0027] The thickness of the continuous casting slab is 150mm, and the composition is: C 0.0042%, Mn 0.11%, S 0.007%, P 0.015%, Si 0.18%, N 25ppm, Als 0.030%, Ca 12ppm, and the balance is Fe and unavoidable impurities. Hot rolling process: the final rolling temperature is 920°C, the hot rolling reduction is 97%, and the coiling temperature is 620°C. The reduction in the cold rolling process was 80%. Bell annealing process: the heating rate is 70°C / hour, the mask annealing temperature is 670 / 720°C, and the holding time is 9 hours.

[0028] After testing, the properties of the low-carbon aluminum-killed steel obtained in this embodiment are shown in Table 3.

[0029] Table 3: Properties of low-carbon aluminum-killed steel obtained in Example 3

[0030]

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Abstract

The invention discloses a low-carbon aluminium killed steel with excellent stamping properties and a production method of the low-carbon aluminium killed steel. The production method comprises the steps of hot rolling, cold rolling and batch annealing, and a casting blank adopted in the method comprises the following components in percentage by weight: less than or equal to 0.010% of C, 0.05-0.20% of Mn, less than or equal to 0.015% of S, less than or equal to 0.020% of P, greater than or equal to 0.05% and less than or equal to 0.25% of Si, 300-600 ppm of Als, less than or equal to 30 ppm of N, less than or equal to 20 ppm of Ca, and the balance of Fe and unavoidable impurities. The method adopts a bran-new composition design, by controlling the processing parameters of heat rolling, the rolling reduction of cold rolling and the process parameters and the like of batch annealing, a good recrystallization annealing structure and texture is obtained, and then a low-carbon Al killed steel with excellent stamping properties is obtained so as to meet the requirements of automobile parts on stamping properties.

Description

technical field [0001] The invention relates to a low-carbon aluminum-killed steel with excellent stamping performance and a production method thereof. Background technique [0002] In order to meet the diverse needs of steel for auto parts and to meet the weight reduction requirements of automobile bodies, more and more high-strength steels, especially advanced high-strength steels, are used in more and more proportions of automobile bodies; Steel for drawing and ultra-deep drawing still has an irreplaceable position in the fields of automobile panels and other fields, and the proportion of steel used in the body is relatively fixed. In order to improve the stamping performance of cold-rolled annealed steel strip, in terms of composition design, it is possible to reduce the carbon content and add an appropriate amount of fixed interstitial elements (such as Nb and / or Ti), and at the same time cooperate with appropriate process parameter control to obtain a good depth. This...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
CPCC22C38/06C21D8/0205C22C38/002
Inventor 夏明生李秀景韩冰孙璐齐建群张琳武冠华李桂兰徐杰常玉国王占国冯慧霄马光宗李娜史文张选丰
Owner HEBEI IRON AND STEEL
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