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Bulletproof steel plate and heat treatment method thereof

A heat treatment method and bulletproof steel plate technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of too fast martensite transformation, poor plasticity bulletproof steel plate, large internal stress, etc., reduce oxidation phenomenon, improve steel plate Effect of plasticity and small residual stress

Active Publication Date: 2021-07-20
晟普特(北京)防护科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] The plate shape control and poor plasticity of heat-treated bullet-proof steel plates have always been the control difficulties of bullet-proof steel plates. This is mainly due to the large temperature difference between the surface and the center of the steel plate when water is used as the cooling medium, especially in the martensitic transformation temperature zone, and the cooling water is in the boiling stage. If the cooling is too fast, it is easy to make the martensite transform too fast and generate a lot of internal stress, resulting in deformation or even cracking of the steel plate

Method used

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Embodiment Construction

[0021] The specific embodiment of the present invention will be further described below in conjunction with specific embodiment:

[0022] Example.

[0023] The chemical element composition of the bulletproof steel plate is: C0.24%, Si0.44%, Mn1.15%, Al0.03%, Ni0.54%, Cr0.5%, Mo0.3%, Nb0.025%, Ti0. 025%, B0.0017%, P0.006%, S0.0018%, N0.0035%, O0.0018%, and the rest are inevitable impurities of Fe element. The length of the steel plate is 6.0 meters, the width of the steel plate is 1.8 meters, and the thickness of the steel plate is 4 mm.

[0024] Its heat treatment operation steps are as follows:

[0025] 1) Heating the steel plate, using a roller hearth quenching furnace to heat the steel plate, using a thermocouple to detect the temperature in the furnace, the heating temperature is 900°C, and starting to keep warm after the tail of the steel plate reaches the heating temperature, the holding time is 20 minutes, and using an oxygen analyzer to detect the temperature in the ...

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Abstract

The invention belongs to the field of heat treatment of iron and steel materials, and in particular relates to a bulletproof steel plate and a heat treatment method thereof. The chemical composition of the bulletproof steel plate is C0.24‑0.26%, Si0.35‑0.45%, Mn1.1‑1.2%, Al0.015‑ 0.06%, Ni0.3‑1.0%, Cr0.45‑0.55%, Mo0.25‑0.35%, Nb0.02‑0.03%, Ti0.017‑0.027%, B0.0010‑0.0020%, P≤0.010%, S≤0.0020%, N≤0.0040%, O≤0.0020%, and the rest are Fe elements and unavoidable impurities. Compared with the prior art, the beneficial effects of the present invention are: 1) Using high-pressure argon to atomize water into extremely fine water droplets, breaking the water vapor film on the surface of the steel plate and improving the cooling capacity; At the same time, the water flow rate is reduced, the argon pressure and flow rate are increased, and the deformation and residual stress are reduced; 3) The oxidation phenomenon is reduced, and the environmental pollution is small.

Description

technical field [0001] The invention belongs to the field of heat treatment of iron and steel materials, and in particular relates to a bulletproof steel plate and a heat treatment method thereof. Background technique [0002] The main function of civilian bulletproof steel plate is to prevent bullets from invading the steel plate, and it is widely used in mobile bank vehicles, private bulletproof cars, police bulletproof patrol vehicles, anti-riot vehicles, anti-riot vehicles, etc. Increasing the thickness of the steel plate to increase the energy required for projectiles to penetrate the steel plate is an effective way to improve the anti-ballistic performance of the steel plate, but this will increase the self-weight of the vehicle and reduce the effective load of the vehicle. Therefore, reducing the thickness of the bullet-proof steel plate and improving the bullet-proof The strength, toughness, weldability, etc. of the steel plate meet the requirements of light weight, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/50C22C38/48C22C38/44C22C38/06C22C38/04C22C38/02C21D1/74C21D1/18C21D1/667C21D9/00
CPCC21D1/18C21D1/667C21D1/74C21D9/0081C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C38/54
Inventor 李悦
Owner 晟普特(北京)防护科技有限公司
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