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Steel for stamping formation and forming component and heat treatment method thereof

A technology for forming components and stamping forming, applied in the fields of stamping and forming components and heat treatment, can solve problems such as reduction of elastic strain energy of lattice trimming, shear deformation strain energy, etc., to improve rolling deformation capacity, optimize heat treatment design, cooling rate less demanding effects

Inactive Publication Date: 2016-04-13
EASYFORMING STEEL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grain enlargement of austenite will provide more nucleation sites of stacking faults and the interaction of shear bands, but at the same time, it will cause the decrease of the elastic strain energy of the lattice cutting edge and the strain energy of shear deformation, which will cause horses. Densitic transformation

Method used

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  • Steel for stamping formation and forming component and heat treatment method thereof
  • Steel for stamping formation and forming component and heat treatment method thereof
  • Steel for stamping formation and forming component and heat treatment method thereof

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Embodiment Construction

[0036] The present invention will be described in more detail below with reference to Examples. The examples are intended to explain exemplary embodiments of the present invention, and the present invention is not limited to these examples.

[0037] The reason why the chemical composition (by weight percentage) of the steel of the present invention is limited is as follows:

[0038] C: 0.22 to 0.48%

[0039] Carbon is the cheapest strengthening element and can strongly increase the strength of steel through interstitial solid solution. Furthermore, an increase in carbon content strongly reduces the Ac 3 , thereby reducing the heating temperature and saving energy. However, too high carbon content will lead to poor welding performance of the steel, and may cause excessive strength of the plate, damage the mold during hot forming, and reduce the life of the mold. For this reason, the upper limit of carbon is set at 0.48%. In order to ensure sufficient carbon enrichment in t...

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Abstract

The invention relates to steel for stamping formation. The steel is characterized by comprising the following components in percentage by weight: 0.22-0.48% of C, 5-9.5% of Mn, 0.5-3.0% of Si+Al and the balance of Fe and inevitable impurities, wherein the steel is a hot-rolled, or hot-rolled and acid-washed, or hot-rolled, acid-washed and plated steel coil or steel plate, or is a cold-rolled and annealed or cold-rolled and plated steel coil or steel plate. The invention further relates to a stamping formation process and a stamping formation component based on the steel, which are mainly applied to but not limited in a vehicle structural part. The steel coil or steel plate or the formation component is obtained by heating up to a temperature of 650-780 DEG C and keeping the temperature by 0.5-60 minutes, and contains residual austenite above 30% (calculated by volume fraction). The mechanical performances reach the following conditions: 0.5-1.2 GPa of yield strength, 1.0-1.5 GPa of tensile strength, and strength and ductility production (tensile strength multiplied by ductility) above 25 GPa%. The invention further relates to a forming component and a heat treatment method of the steel.

Description

technical field [0001] The present invention relates to a steel material for stamping, and a stamping component based on the steel and a heat treatment method. Background technique [0002] Energy saving and emission reduction has become an important indicator of automobiles, and the important means to achieve these goals is the lightweight of automobiles. Reducing vehicle weight improves fuel efficiency and reduces exhaust emissions. To reduce weight while ensuring safety, the use of high-strength steel has become an inevitable trend. At present, such as dual-phase (DP) steel, multi-phase (CP) steel, phase transformation induced plasticity (TRIP) steel, martensitic steel and other first-generation advanced high-strength steels (the strength-plastic product is tensile strength × total elongation 15~20GPa%) has been widely used in the automotive field, and has played an important role in the lightweight of automobiles. However, the formability and strength of the first gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C22C38/12C22C38/14C22C38/16C22C38/08C21D8/02C21D6/00
CPCC21D6/005C21D8/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/32C21D8/00C21D8/0247C21D8/0294C21D2211/001C21D2211/004C21D2211/005C21D2221/10C21D2211/008
Inventor 易红亮杜鹏举杨达朋熊小川
Owner EASYFORMING STEEL TECH CO LTD
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