Steel material for thermal punching formation, thermal punching formation process and thermal punching formation component

A technology for hot stamping forming and forming components, which is applied in the field of hot stamping forming process, hot stamping forming components, and steel for hot stamping forming, can solve the problems of difficult to accurately control temperature, difficult to realize hot stamping process equipment, etc., to avoid abnormal toughness. Reduced, simple process control effects

CN108374127AInactive Publication Date: 2018-08-07IRONOVATION MATERIALS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-08-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a steel material for thermal punching formation, a thermal punching formation process and a thermal punching formation component. The steel material contains the following components in percentage by weight: 0.2%-0.4% of C, 0-0.8% of Si, 0-1.0% of Al, 0-0.005% of B, 0.5%-3.0% of Mn, 0-1% of Mo, 0-2% of Cr, 0-5% of Ni, 0-0.4% of V, 0-0.2% of Nb, Ti less than or equal to 0.01%and the balance of following unavoidable impurity elements such as P, S and N during smelting, wherein when B is less than or equal to 0.0005%, a formula 29*Mo+16*Mn+14*Cr+5.3*Ni is more than or equal to 30%; and when B is more than 0.0005% and less than or equal to 0.005%, the steel material contains 0.4%-1.0% of Al.
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Description

technical field

[0001] The invention relates to a steel material for hot stamping forming, a hot stamping forming process and a hot stamping forming component. Background technique

[0002] Lightweight is an important way to achieve energy saving and emission reduction in the automotive industry. Every 10% reduction in the mass of the car body can reduce fuel consumption by 5-10%. Steel materials generally account for more than 60% of automobile body materials. The use of advanced high-strength steel can reduce the thickness of parts, reduce the use of materials, and reduce the weight of the car body while ensuring the safety of the car. However, as the strength of steel materials increases at room temperature, the formability decreases, and room temperature forming of high-strength steels faces problems such as springback and abrasive wear. Therefore, cold stamping at room temperature can generally only be used for steel materials with a strength below 1000 MPa. . [0003...

Examples

Embodiment Construction

[0042] The technical solutions of the present invention will be described below in conjunction with specific embodiments.

[0043] The steel for hot stamping of the present invention comprises C: 0.2-0.4%, Si: 0-0.8%, Al: 0-1.0%, B: 0-0.005%, Mn: 0.5-3.0%, Mo: 0-1%, Cr: 0-2%, Ni: 0-5%, V: 0-0.4%, Nb: 0-0.2%, Ti: ≤0.01%, and unavoidable P, S, N during smelting and other impurity elements, and when B≤0.0005%, satisfy 29*Mo+16*Mn+14*Cr+5.3*Ni ≥ 30%; when 0.0005%<B≤0.005%, contain 0.4-1.0% Al. The effect and proportioning basis of each element of the present invention are as follows.

[0044] C: Carbon can stabilize the austenite phase and reduce A c3 temperature, thereby reducing the thermoforming temperature. Carbon is an interstitial solid solution element, and its strengthening effect is much greater than that of replacement solid solution elements. As the carbon content in the steel increases, the carbon content in the martensite after quenching will also increase, thereb...