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A kind of cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles and its preparation method

A low-alloy high-strength and strengthening steel technology, applied in the field of alloy steel preparation, can solve the problems of high equipment requirements, high processing difficulty and high cost, and achieve the effects of low equipment requirements, low smelting difficulty and low tensile strength.

Active Publication Date: 2020-08-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These invention patents can obtain high-strength automotive sheets, but because the yield strength of the steel sheets is too high, the requirements for subsequent processing and forming equipment are very high, the processing is very difficult, the efficiency is low, and the cost is high.

Method used

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  • A kind of cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles and its preparation method
  • A kind of cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles and its preparation method
  • A kind of cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0026] The invention provides a cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles and a preparation method thereof.

[0027] The chemical composition mass percentage of the strengthened steel is: C: 0.05% to 0.15%, Mn: 1.0% to 2.0%, Si: 0.05% to 0.25%, Cr: 0.20% to 1.0%, Mo: 0.05% to 0.3%, Al : 0.01%~0.06%, Nb: 0.01~0.10%, V: 0.01~0.10%, Ti: 0.01~0.10%, B: 0.001~0.006%, P<0.03%, S<0.03%, the balance is Fe and Unavoidable impurities.

[0028] Such as figure 1 and figure 2 Shown, the preparation method of this strengthened steel comprises steps as follows:

[0029] (1) Preparation of hot-rolled sheet: melting, casting, and forging the raw materials prepared according to the chemical composition ratio to form a slab, heating the slab, and performing multi-pass hot-rolling deformation after homogenization treatment, and air-cooling to coil after hot-rolling Take the temperature and coil it to room temperature to obtain the required hot-rolled s...

Embodiment 1

[0034] The chemical composition and mass percentage of cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles in this embodiment are: C: 0.06%, Mn: 1.05%, Si: 0.17%, Cr: 0.6%, Mo: 0.13%, Al : 0.03%, Nb: 0.02%, V: 0.02%, Ti: 0.02%, B: 0.002%, P<0.03%, S<0.03%, and the balance is Fe and unavoidable impurities.

[0035] The preparation method of cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles described in this embodiment specifically includes the following steps:

[0036] (1) Forging into slabs after smelting and casting: melt the prepared raw materials in a vacuum induction melting furnace at a melting temperature of 1660°C, and pour them into ingots, forge and deform the ingots, and finally forge them into slabs. The accumulated deformation is 80%. After forging, it is air-cooled to room temperature. The heating temperature of the ingot is 1160°C, the holding time is 2h, the starting forging temperature is 1130°C, and...

Embodiment 2

[0043] The difference from Example 1 is that the annealing temperature of the final cold-rolled sheet is 650°C, and the mechanical properties of the steel sheet after the final annealing treatment are tested according to the national standard, and the yield strength is 335MPa, the tensile strength is 505MPa, and the elongation is 29.8%.

[0044] The annealed sheet obtained after cold rolling can be subjected to cold plastic deformation at room temperature to obtain complex auto parts. After the parts are austenitized at a high temperature of 900°C, they can be air-cooled to room temperature to obtain high-strength and good-toughness auto parts. After testing the mechanical properties of the high-strength auto parts according to the national standard, the yield strength is 686MPa, the tensile strength is 1016MPa, and the elongation is 13.9%, which meets the performance requirements of the new generation of high-strength steel for automobiles.

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Abstract

The invention provides cold-rolled low-alloy high-strength air-cooled strengthened steel for an automobile and a preparation method, and belongs to the technical field of alloy steel preparation. Thestrengthened steel comprises, by mass percent, 0.05%-0.15% of C, 1.0%-2.0% of Mn, 0.05%-0.25% of Si, 0.20%-1.0% of Cr, 0.05%-0.3% of Mo, 0.01%-0.06% of Al, 0.01%-0.10% of Nb, 0.01%-0.10% of V, 0.01%-0.10% of Ti, 0.001%-0.006% of B, smaller than 0.03% of P, smaller than 0.03% of S and the balance Fe and unavoidable impurities. The strengthened steel is obtained through the steps that after raw material preparing, smelting and pouring are conducted to obtain a plate blank, the plate blank is heated, multiple passes of hot rolling deformation is conducted after homogenization treatment is conducted, air cooling is conducted till the temperature reaches rolling temperature, rolling is conducted till the temperature reaches the room temperature, cold rolling is conducted after acid pickling, and finally annealing treatment is conducted. The obtained cold-rolled annealing plate has the yield strength of being lower than 350 MPa and the tensile strength of being lower than 500 MPa, has the good cold forming performance and can be machined into complex automobile parts.

Description

technical field [0001] The invention relates to the technical field of alloy steel preparation, in particular to a cold-rolled low-alloy high-strength air-cooled strengthened steel for automobiles and a preparation method thereof. Background technique [0002] Reducing fuel consumption and improving body safety are the development trends of the automobile industry. Reducing the weight of automobiles is an effective way to reduce automobile fuel consumption, which requires the use of thinner steel plates. However, the thinning of the steel plate will inevitably lead to the reduction of the safety performance of the car body. In order to alleviate this contradiction, the use of high-strength and ultra-high-strength steel plates is the only way to design the car body. In recent years, a large amount of capital has been invested in China to develop a variety of high-strength or ultra-high-strength steel plates, including DP, TRIP, and TWIP steels, etc., to reduce the weight of v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/04C22C38/02C21D1/26C21D8/02
CPCC21D1/26C21D8/0226C21D8/0231C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 米振莉罗翔吴彦欣李会健张彭磊彭飞张迪
Owner UNIV OF SCI & TECH BEIJING
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