Thermal treatment method for civil bulletproof steel
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A heat treatment method and bulletproof steel technology, which is applied in the field of heat treatment of steel materials, can solve the problems of low toughness and high strength, and achieve the effects of improving toughness, improving impact toughness, and good toughness
Inactive Publication Date: 2019-06-07
INNER MONGOLIA METAL MATERIAL RES INST
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[0006] The purpose of the present invention is to solve the problem of high strength and low toughness of the existing thin armor bulletproof steel, improve its impact performance on the basis of satisfying the p
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Embodiment 1
[0024] (1) Quenching: Heat the billet to 875°C at a heating rate of 10°C / min, keep it warm for 1.5h and then cool it to room temperature with oil.
[0025] (2) Quenching in the two-phase zone: heat to 750°C with a heating rate of 10°C / min and hold for 1 hour, then cool the oil to room temperature.
[0026] (3) Tempering: reheat the billet in (2) to 175°C, keep it warm for 3 hours, and then air-cool to room temperature.
[0027] After the above heat treatment, the structure of the steel plate is ferrite + martensite, the performance test results are all within the design range, and the ballistic performance reaches the "box or bulletproof steel plate" C in the public safety industry standard GA 164-2005 of the People's Republic of China class.
Embodiment 2
[0029] (1) Quenching: Heat the steel billet to 885°C with a heating rate of 12°C / min, keep it warm for 1.5h and then cool it to room temperature with oil.
[0030] (2) Quenching in the two-phase zone: heat to 760°C with a heating rate of 10°C / min and hold for 1 hour, then cool the oil to room temperature.
[0031] (3) Tempering: reheat the billet in (2) to 180°C, keep it warm for 3 hours, and then air-cool to room temperature.
[0032] After the above heat treatment, the structure of the steel plate is ferrite + martensite, the performance test results are all within the design range, and the ballistic performance reaches the "box or bulletproof steel plate" C in the public safety industry standard GA 164-2005 of the People's Republic of China class.
Embodiment 3
[0034] (1) Quenching: Heat the steel billet to 895°C with a heating rate of 10°C / min, keep it warm for 1.6h and then cool it to room temperature with oil.
[0035] (2) Quenching in the two-phase zone: heat to 765°C with a heating rate of 12°C / min and hold for 1.2h, then cool the oil to room temperature.
[0036] (3) Tempering: reheat the billet in (2) to 190°C, keep it warm for 3 hours, and then air-cool to room temperature.
[0037] After the above heat treatment, the structure of the steel plate is ferrite + martensite, the performance test results are all within the design range, and the ballistic performance reaches the "box or bulletproof steel plate" C in the public safety industry standard GA 164-2005 of the People's Republic of China class.
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Abstract
The invention discloses a thermal treatment method for civil bulletproof steel. The thermal treatment method comprises the following steps: carrying out composition according to chemical element components of the above bulletproof steel in mass percent, smelting molten steel by adopting a vacuum smelting furnace so as to manufacture a steel billet, heating the steel billet to 1250 DEG C to 1300 DEG C, carrying out heat preservation for 6 h to 8 h, and carrying out hammer forging till the set thickness is reached; and heating the steel billet subjected to hammer forging to 1280 DEG C to 1330 DEG C, carrying out heat preservation for 1 h to 2 h, carrying out rolling after discharging from the furnace, carrying out air cooling to the room temperature after rolling, and then carrying out the thermal treatment process which comprises the procedures of quenching, two-phase region quenching and tempering. A civil bulletproof steel plate prepared through the thermal treatment method has the advantages that the yield strength reaches 1350 MPa to 1480 MPa, the tensile strength reaches 1550 MPa to 1750 MPa, the elongation reaches 12% to 14%, the normal-temperature impact property (a u-shapednotch) reaches 55 J to 60 J, the low-temperature impact property (negative 40 DEG C and a u-shaped notch) reaches 30 J to 38 J, the Brinell hardness HBS reaches 450 to 550, and the anti-bullet property reaches the grade C of a box body or a bulletproof steel plate involved in the People's Republic of China Public Safety Industry Standard GA 164-2005. The protective requirements of current light-duty vehicles such as bulletproof cash trucks as well as anti-terrorist, anti-explosion and peacekeeping vehicles can be met.
Description
technical field [0001] The invention relates to the technical field of heat treatment of iron and steel materials, and particularly provides a heat treatment method for civilian bulletproof steel. Background technique [0002] In recent years, more and more thin bulletproof steel plates have been applied to light special vehicles in the civilian field, such as anti-terrorism explosion-proof vehicles, armed escort vehicles, bulletproof cash transport vehicles, etc. However, most of the armored bulletproof steel plates independently developed by our country are used in the military field, and there are few applications in the civilian field. As a result, most of the civilian bulletproof steels in our country rely on imports, and the most imported ones are Domax500 steel produced by Swedish Stell AB in Sweden. Its tensile strength is generally greater than 1500MPa, and it has good toughness and impact protection performance. [0003] At present, the B900FD high-strength hot-ro...
Claims
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