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High-strength steel plate for lightweight automobiles and hot stamping forming process of high-strength steel plate

A technology of hot stamping and high-strength steel plates, which is applied in the field of automotive steel plates, can solve the problems of poor forming quality, difficult forming, and easy damage to forming molds, etc., to achieve good products, ensure physical properties, and reduce surface oxide defects.

Inactive Publication Date: 2020-09-18
天津英利模具制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of the strength of the current steel plate will lead to a decrease in formability, and it is not easy to form a complex shape required for automobile design. In addition, during the hot stamping process of high-strength steel plate, the forming mold is easy to be damaged, and the forming quality is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0019] A high-strength steel plate for lightweight automobiles, the composition and mass percentage of which are:

[0020] C:0.2%;Si:0.8%;Mn:1.5%;Ti:0.005%;B:0.2%;P:0.005%;S:0.0001%;Al:0.01%;N:0.005%;Ni:0.1%; Cu: 0.1%; Cr: 0.1%; Mo: 0.1%; V: 0.05%; the rest is Fe and other unavoidable impurities;

[0021] The microstructure is composed of 10% bainite, 30% pearlite and 60% ferrite in terms of area fraction, and FeO, Fe are formed from the surface to within 50um 2 SiO 4 , Fe 3 (PO 4 ) 2 ternary eutectic compound.

[0022] The surface roughness of the steel plate is 1.5-2.0um.

[0023] The surface of the steel plate is provided with a galvanized layer, and the processing of the galvanized layer adopts a hot-dip galvanizing method.

[0024] The steel plate has a tensile strength of 600-650 MPa, a yield strength of 450-550 MPa and an elongation of 16-30%.

[0025] The hot stamping process of the above-mentioned high-strength steel plate for lightweight automobiles is specif...

specific Embodiment 2

[0030] A high-strength steel plate for lightweight automobiles, the composition and mass percentage of which are:

[0031] C: 0.5%; Si: 2%; Mn: 3%; Ti: 0.1%; B: 0.5%; P: 0.1%; S: 0.01%; Al: 0.9%; N: 0.01%; Ni: 2%; Cu: 2%; Cr: 2%; Mo: 2%; V: 0.1%; the rest is Fe and other unavoidable impurities;

[0032] The microstructure is composed of 40% bainite, 20% pearlite and 40% ferrite in terms of area fraction, and FeO, Fe are formed from the surface to within 50um 2 SiO 4 , Fe 3 (PO 4 ) 2 ternary eutectic compound.

[0033] The surface roughness of the steel plate is 1.5-2.0um.

[0034] The surface of the steel plate is provided with a galvanized layer, and the processing of the galvanized layer adopts the method of galvanizing and annealing.

[0035] The steel plate has a tensile strength of 600-650 MPa, a yield strength of 450-550 MPa and an elongation of 16-30%.

[0036] The hot stamping process of the above-mentioned high-strength steel plate for lightweight automobiles ...

specific Embodiment 3

[0041] A high-strength steel plate for lightweight automobiles, the composition and mass percentage of which are:

[0042] C: 0.3%; Si: 1%; Mn: 2%; Ti: 0.05%; B: 0.4%; P: 0.008%; S: 0.005%; Al: 0.5%; N: 0.008%; Ni: 1%; Cu: 1%; Cr: 1%; Mo: 1%; V: 0.08%; the rest is Fe and other unavoidable impurities;

[0043] The microstructure is composed of 20% bainite, 30% pearlite and 50% ferrite in terms of area fraction, and FeO, Fe are formed from the surface to within 50um 2 SiO 4 , Fe 3 (PO 4 ) 2 ternary eutectic compound.

[0044] The surface roughness of the steel plate is 1.5-2.0um.

[0045] The surface of the steel plate is provided with a galvanized layer, and the processing of the galvanized layer adopts the method of zinc-iron electroplating.

[0046] The steel plate has a tensile strength of 600-650 MPa, a yield strength of 450-550 MPa and an elongation of 16-30%.

[0047] The hot stamping process of the above-mentioned high-strength steel plate for lightweight automob...

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Abstract

The invention provides a high-strength steel plate for lightweight automobiles and a hot stamping forming process of the high-strength steel plate. The high-strength steel plate is prepared from the following components: 0.2%-0.5% of C, 0.8%-2% of Si, 1.5%-3% of Mn, 0.005%-0.1% of Ti, 0.2%-0.5% of B, 0.005%-0.1% of P, 0.0001%-0.01% of S, 0.01%-0.9% of Al, 0.005%-0.01% of N; 0.1%-2% of Ni, 0.1%-2%of Cu, 0.1%-2% of Cr, 0.1%-2% of Mo, 0.05%-0.1% of V and the balance Fe and other inevitable impurities. During hot stamping forming, the heat preservation is carried out at a temperature range of 850-950 DEG C for 5-10 minutes. In the case of the fact that the strength of the steel plate is improved, the physical properties are ensured, and relatively good products in the hot stamping process canbe obtained.

Description

technical field [0001] The invention relates to the technical field of automobile steel plates, in particular to a high-strength steel plate for lightweight automobiles and a hot stamping process thereof. Background technique [0002] Energy saving, safety, and environmental protection are the main body of automobile development in the world today, and automobile lightweight plays an important role in resource conservation, environmental protection, and promotion of automobile safety. In the field of transportation equipment such as automobiles, efforts are being made to use high-strength materials to reduce weight. On the premise of not increasing the weight of the vehicle body, improving the strength of the raw material steel plates of automobile components has become a research hotspot. However, the improvement of the strength of the current steel plate will lead to a decrease in formability, and it is not easy to form a complex shape required for automobile design. In ad...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/58C22C38/50C22C38/54C22C38/06C22C38/42C22C38/44C22C38/46C22C38/34C21D7/13
CPCC21D7/13C21D2211/002C21D2211/005C21D2211/009C22C38/02C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/50C22C38/54C22C38/58
Inventor 杨冬雪王会东安鹏周正兴孙兴
Owner 天津英利模具制造有限公司
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