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Carbon silicon manganese hot rolled quenching and partitioning (Q&P) steel and preparation method thereof
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A carbon-silicon-manganese system and process technology, which is applied in the field of material processing, can solve problems such as high energy consumption and complicated procedures, and achieve the effect of simplifying the process and reducing costs
Active Publication Date: 2014-04-02
UNIV OF SCI & TECH BEIJING
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[0004] The purpose of the present invention is to solve the problem that Q&P steel for automobile plates is realized through heat treatment on the basis of cold-rolled plates, resulting in complicated procedures and high energy consumption
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Embodiment 1
[0019] The composition percentage of this hot-rolled Q&P is: C: 0.18%, Si: 1.43%, Mn: 1.35%, P≤0.01%, S: 0.0054%, and the rest are Fe and unavoidable elements.
[0020] Hot rolling process method one:
[0021] After smelting and forging, the steel billet is heated to 1200°C, and after 1 hour of heat preservation, it undergoes rough rolling and finish rolling. Air cool to room temperature. According to the mechanical performance test, the yield strength is 455MPa, the tensile strength is 755MPa, the elongation is 30%, and the retained austenite is 8.53%. Metallographic structure such as figure 2 As shown, the microstructure at room temperature is ferrite, martensite and retained austenite.
[0022] Hot rolling process method two:
[0023] After smelting and forging, the steel billet is heated to 1200°C and held for 1 hour. After rough rolling and finish rolling, the final rolling temperature is 880°C, water-cooled to 300°C, simulated coiling and heat preservation for 30 mi...
Embodiment 2
[0025] The hot-rolled Q&P composition percentages are: C: 0.21%, Si: 1.43%, Mn: 1.51%, P≤0.01%, S≤0.01%, and the rest are Fe and unavoidable elements.
[0026] Hot rolling process method one:
[0027] After smelting and forging, the steel billet is heated to 1150°C, and after 1 hour of heat preservation, it undergoes rough rolling and finish rolling. Air cool to room temperature. According to the mechanical performance test, the yield strength is 630MPa, the tensile strength is 970MPa, the elongation is 21%, and the retained austenite is 7.8%. Metallographic structure such as figure 2 As shown, the microstructure at room temperature is ferrite, martensite and retained austenite.
[0028] Hot rolling process method two:
[0029] After smelting and forging, the steel billet is heated to 1150°C and held for 1 hour. After rough rolling and finish rolling, the final rolling temperature is 870°C, water-cooled to 290°C, simulated coiling and heat preservation for 1 hour, and air...
Embodiment 3
[0031] The composition percentage of this hot-rolled Q&P is: C: 0.2%, Si: 1.5%, Mn: 1.84%, P: 0.005%, S: 0.008%, and the rest are Fe and unavoidable elements.
[0032] Hot rolling process method one:
[0033] After smelting and forging, the steel billet is heated to 1100°C, and after 1 hour of heat preservation, it undergoes rough rolling and finish rolling. Air cool to room temperature. According to the mechanical performance test, the yield strength is 780MPa, the tensile strength is 1018MPa, the elongation is 18%, and the retained austenite is 9.4%. Metallographic structure such as figure 2 As shown, the microstructure at room temperature is ferrite, martensite and retained austenite.
[0034] Hot rolling process method two:
[0035] After smelting and forging, the steel billet is heated to 1200°C and held for 1 hour. After rough rolling and finish rolling, the final rolling temperature is 880°C, water-cooled to 280°C, simulated coiling and heat preservation for 40 min...
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Abstract
Disclosed are a carbon silicon manganese hot rolled Q&P steel and a preparation method thereof, belonging to the field of material processing. The raw materials used in the method comprise: C 1.5 to 2.5%, Si 1.3 to 1.8%, Mn 1.3 to 2.0%, S no more than 0.01% and P no more than 0.01%, with the balance being Fe. The raw materials are smelted and forged into billet. Hot rolling technology can be divided into two categories: one is to heat the billet to a temperature of 1100 to 1200 DEG C, to carry out rough rolling and finish rolling after insulation for one hour with a finishing temperature 30 to 50 DEG C above Ar3, to carry out air cooling until the temperature of the billet is between Ar1 and Ar3, followed by water cooling of the billet to a temperature 30 to 100 DEG C below the Ms point, to simulate curling at the temperature, to keep the billet at the temperature for 20 to 60 minutes and to carry out air cooling of the billet to room temperature; and the other is to heat the billet to a temperature of 1100 to 1200 DEG C, to carry out rough rolling and finish rolling after insulation for one hour with a finishing temperature 30 to 50 DEG C above Ar3, followed by water cooling of the billet to a temperature 30 to 100 DEG C below the Ms point, to simulate curling at the temperature, to keep the billet at the temperature for 20 to 60 minutes and to carry out air cooling of the billet to room temperature. According to the invention, the operation of cold rolling and heat treatment after cold rolling is not contained in the preparation of the hot rolled Q&P steel, thereby simplifying the technology and reducing cost. The Q&P steel obtained in the invention has a tensile strength of 760 to 1340 MPa and elongation percentage of 12 to 30%, and can obtain 5.3 to 10% of residual austenite at room temperature.
Description
technical field [0001] The invention belongs to the field of material processing, and relates to a carbon-silicon-manganese hot-rolled Q&P steel and a preparation method thereof. Background technique [0002] While automobiles bring convenience to the people, they also bring many problems such as traffic congestion and environmental pollution. Therefore, the development of "environmentally friendly vehicles" characterized by low fuel consumption and low emissions has become a future development trend. Studies have shown that vehicle lightweight is the main measure to achieve this goal. Every 10% reduction in vehicle weight can save 3% to 7% of fuel. Since the first oil crisis, the lightweight research of automobiles began. In the 1990s, the lightweight of automobiles was accelerated. The ULSAB-AVC (Ultra-Light Steel Auto Body Advanced Vehicle Concepts) project organized by the World Steel Association 100% of the white body is made of high-strength steel plates, of which mo...
Claims
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Application Information
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