High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof

A technology for hot forming steel and a manufacturing method, which is applied in the field of steel rolling and can solve the problems of reduced strength and increased plasticity of steel plates.

Inactive Publication Date: 2014-12-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the plasticity of the steel plate after forming is increased by this method, the strength is greatly reduced

Method used

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  • High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof
  • High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof
  • High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] The invention provides a high-bending-resistant hot-formed steel for automobiles, comprising the following chemical components in mass percentage: C: 0.18-0.30%, Si≤0.30%, Mn: 1.00-1.60%, P≤0.015%, S≤ 0.0020%, Cr: 0.10~0.30%, Ti: 0.02~0.06%, Al: 0.020~0.060%, B: 0.0005~0.0040%, [N]≤0.004%, [O]≤0.003%, the balance is Fe and Inclusions are inevitable. In addition, the following chemical components are added in mass percentage: Nb: 0.02-0.10%, Mo: 0.15-0.40%, V≤0.10%, W≤0.40%, REM≤0.05%.

[0035] Among them, carbon (C): a solid solution strengthening element, plays a decisive role in the strength of the steel plate. In order to make the tensile strength of hot-formed steel reach more than 1300MPa, the C content must reach more than 0.18%, and with the increase of carbon content, cold working is difficult and the welding performance deteriorates. Therefore, the C content is controlled at 0.18-0.30%, which reduces the processing difficulty while ensuring the tensile streng...

Embodiment approach 2

[0052] Such as figure 2 as shown, figure 2 It is a schematic flowchart of a method for manufacturing hot-formed steel with high bending resistance for automobiles provided by Embodiment 2 of the present invention.

[0053] Step S10: the molten iron is pretreated, then smelted in a converter, alloyed and refined, and then continuously cast into a slab. In this example, the molten iron is subjected to KR desulfurization pretreatment and full three desulfurization converter smelting processes to control the content of harmful elements such as sulfur and phosphorus in molten steel, and is refined by LF furnace to accurately control the chemical components in molten steel content, and then use the continuous casting machine to obtain the required slab.

[0054] The cast slab obtained by the above method has the following chemical composition in mass percentage: C: 0.18-0.30%, Si≤0.30%, Mn: 1.00-1.60%, P≤0.015%, S≤0.0020%, Cr: 0.10-0.30% , Ti: 0.02~0.06%, Al: 0.020~0.060%, B: 0...

Embodiment approach 3

[0065] The slab with the chemical composition as described in Embodiment 1 is hot-rolled according to the manufacturing method of Embodiment 2 (see Table 1 for detailed composition), wherein the heating temperature is 1220° C., the total reduction ratio of rough rolling is 84%, and the finishing rolling The total reduction rate is 91%, the finish rolling temperature is 860°C, the time period from the end of finish rolling to the beginning of cooling is 0.5s, and the cooling rate is 20°C / s. And crimping at 600°C to obtain hot-rolled coils, the average grain size of the obtained hot-rolled coils is about 6um. The hot-rolled coils are pickled and then cold-rolled to 1.1mm, and then tempered to obtain chilled coils after annealing. The average grain size of the chilled coils is about 7.0um. After the chilled roll is cut and blanked, it is heated to 880°C, kept for 4 minutes, and then transferred to a press for hot-press forming. Finally, press quenching to 180°C at a cooling rate...

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Abstract

The invention belongs to the technical field of steel rolling, and particularly relates to high-flexural-behavior hot-formed steel used for automobiles and a manufacturing method thereof. The steel comprises following trace elements by mass: 0.18-0.3% of C, not more than 0.3% of Si, 1-1.6% of Mn, not more than 0.015% of P, not more than 0.002% of S, 0.1-0.3% of Cr, 0.02-0.06% of Ti, 0.02-0.06% of Al, 0.0005-0.004% of B, not more than 0.004% of [N] and not more than 0.003% of [O]. The manufacturing method includes: heating a casting blank at a low temperature, performing controlled rolling in two stages, rapidly cooling, reeling up at a low temperature, preparing a steel coil by cold rolling and low-temperature critical annealing, shearing to prepare component tablets and performing hot press molding. By the manufacturing method, steel crystal grains are refined and ductility and toughness of the steel are enhanced, so that more energy is absorbed during deformation of the steel and automobile safety performance is enhanced.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a hot-formed steel with high bending resistance for automobiles and a manufacturing method thereof. Background technique [0002] With the continuous development of the automobile industry, the continuous advancement of science and technology, and people's higher and higher requirements for the lightweight and safety of automobiles, the requirements for the performance of steel plates that make up automobiles have also increased. [0003] At present, a large number of high-strength and ultra-high-strength steel plates are used on automobile bodies and auto parts to meet the requirements of lightweight automobiles. Rapid decline, severe die wear. Cracking and severe springback are prone to occur during cold stamping, especially when forming parts with complex shapes. The hot stamping forming technology of steel plate can effectively alleviate the above problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/32C22C33/04C21D8/00
Inventor 李学涛朱国森滕华湘冯莉莉王彦超王海全李翔宇陈斌刘光明乔建军
Owner SHOUGANG CORPORATION
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