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A kind of preparation method of ultrahigh-strength hot forming steel for automobile

A hot stamping forming and ultra-high technology, applied in the field of high-strength steel, can solve problems such as the inability to use ordinary forming methods, and achieve the effects of thinning thickness, excellent plasticity, and increased strength

Active Publication Date: 2018-11-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The invention aims at the problem that the ultra-fine bainite steel has ultra-high strength and cannot be adopted by ordinary forming methods. At the same time, the strength level and plasticity of the steel for hot stamping forming need to be improved urgently. The hot stamping forming is combined with bainite isothermal transformation. Improve the hot stamping forming process to produce ultra-high-strength auto parts, develop ultra-high-strength hot-formed steel for automobiles with a tensile strength of 1500-2200 MPa and an elongation of 10-20%

Method used

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  • A kind of preparation method of ultrahigh-strength hot forming steel for automobile
  • A kind of preparation method of ultrahigh-strength hot forming steel for automobile
  • A kind of preparation method of ultrahigh-strength hot forming steel for automobile

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Embodiment Construction

[0032] According to the chemical composition given in Table 1, it is smelted in a vacuum induction heating furnace, cast into a forging billet and then forged. The billet is heated to 1250°C and homogenized and annealed for 16 hours under atmosphere protection conditions.

[0033] Table 1 is the mass percent of each composition

[0034] Table 1

[0035]

[0036] The hot-rolling process is to heat the billet to 1250°C for 2 hours, and hot-roll six passes on a 350mm two-roll mill to obtain a hot-rolled sheet with a thickness of about 3mm, with a total deformation of 85% to 90%. The final rolling temperatures were 1150°C and 1000°C respectively, and then cooled to room temperature with the furnace.

[0037] Heat the hot-rolled steel plate to 900°C in a resistance furnace, keep it warm for 0.5h, then quickly transfer it to a mold for hot stamping, and then put it into a salt bath furnace at 215°C to cool in a salt bath, and hold it for 60s, then move it into Insulate in a sal...

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Abstract

The invention discloses a preparation method for ultrahigh-strength thermoforming steel for a car, and belongs to the technical field of high-strength steel. The preparation method comprises the following steps of: combining stamping forming with low-temperature bainite isothermal treatment; comprehensively utilizing refining technologies such as micro-alloy refining, controlled-rolling controlled-cooling refining, pre-deforming and low-temperature bainite isothermal treatment, thereby obtaining an ultra-fine structure which consists of carbide-free bainite, a little blocky type retained austenite and martensite with volume fraction smaller than 10%, and the ultra-fine structure has tensile strength of 1500-2200 MPa, and ductility of 10-20%. A preparation process for ultrahigh-strength steel comprises the following technological process: smelting, continuous casting, hot rolling, cutting, thermal stamping forming and low-temperature bainite isothermal treatment. During thermal stamping forming, a cut hot-rolled plate is re-heated to Ac3+50 DEG C for austenization, and heat is preserved for 0.5-1 hour, and then, the plate is immediately moved onto thermal stamping equipment to perform stamping forming; the quick cooling and quenching effect of a thermal stamping mould is utilized for cooling super-cooled austenite to a temperature lower than Ms point, is subjected to isothermal treatment for 0.5-1 minute, is quickly put into a salt-bath furnace or a resistance furnace of 200-300 DEG C to perform isothermal treatment for 4-6 hours, is subjected to isothermal bainite transformation, and is taken out for being air-cooled to the room temperature.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel, and relates to an ultra-high-strength hot-formed steel for automobiles and a preparation method thereof. Background technique [0002] With the improvement of relevant laws and regulations in our country and the improvement of people's awareness of safety and environmental protection, more and more attention has been paid to the energy saving, emission reduction and safety performance of automobiles. The development and application of high-strength steel and ultra-high-strength steel can improve automobile safety and reduce automobile weight. , Realizing the lightweight of automobiles and reducing fuel consumption are the development trends of modern automobiles. Ultra-high-strength steel hot stamping forming technology, as a new shape technology to realize the lightweight of automobiles, satisfies the market demand well with its characteristics of light weight, high strength, good fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/34C22C38/26C22C38/32C22C38/38C22C38/06C21D8/00
CPCC21D8/005C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/04C22C38/06C22C38/26C22C38/32C22C38/34C22C38/38
Inventor 赵爱民郭辉刘伟孙绍恒印珠凯裴伟王家星曾清华吴起伟
Owner UNIV OF SCI & TECH BEIJING
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