Vehicle high strength and toughness hot-forming steel plate and preparation method thereof
A high-strength toughness, hot forming technology, applied in the field of high-strength automotive steel, can solve the problems of insufficient toughness and high strength, and achieve the effects of saving resources, good strength and toughness, and reducing costs
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[0020] Example 1
[0021] A high-strength and toughness hot-formed steel sheet for automobiles, its composition and weight percentage content are: C: 0.25%, Si: 0.90%, Mn: 1.78%, Ti: 0.022%, B: 0.0021%, S: 0.0013%, P : 0.0058%, the rest is Fe. The steel is heated to the austenitizing temperature at a rate of 25°C / s to 880°C and held for 5 minutes, and then 1 second -1 The strain rate was hot rolled with a strain deformation of 0.8, then quenched to 310°C at a rate of 50°C / s, isothermally held at a tempering temperature of 310°C for 5s, and finally quenched to room temperature. After testing, the tensile strength Rm of steel is 1534MPa, and the yield strength Rp 0.2 It is 862MPa and the total elongation is 12.8%.
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[0022] Example 2
[0023] A high-strength and toughness hot-formed steel sheet for automobiles, its composition and weight percentage content are: C: 0.25%, Si: 0.90%, Mn: 1.78%, Ti: 0.022%, B: 0.001%, S: 0.0013%, P : 0.0058%, the rest is Fe. The steel is heated at a rate of 50℃ / s to the austenitizing temperature of 1000℃ and held for 2min, then at a rate of 1s -1 The strain rate was hot rolled with a strain deformation of 0.8, then quenched to 300°C at a rate of 80°C / s, isothermally held at a tempering temperature of 300°C for 30s, and finally quenched to room temperature. After testing, the tensile strength Rm of the steel is 1633MPa, and the yield strength Rp 0.2 It is 952MPa and the total elongation is 14.9%.
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[0024] Example 3
[0025] A high-strength and toughness hot-formed steel sheet for automobiles, the composition and weight percentage content are: C: 0.30%, Si: 0.50%, Mn: 2.4%, Ti: 0.01%, B: 0.005%, S: 0.0013%, P : 0.0058%, the rest is Fe. The steel is heated at a rate of 100℃ / s to the austenitizing temperature of 850℃ and held for 30min, then 1s -1 The strain rate was hot rolled with a strain deformation of 0.8, then quenched to 290°C at a rate of 100°C / s, isothermally held at a tempering temperature of 290°C for 50s, and finally quenched to room temperature. After testing, the tensile strength Rm of the steel is 1696MPa, and the yield strength Rp 0.2 It is 932MPa, and the total elongation is 15.7%.
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