1000Mpa-grade high-strength hot-rolled anti-bullet steel plate and making method

Abstract

This invention relates to a kind of high strength hot-rolled bulletproof steel of 1000Mpa in the following weight percentage: C 0.17-0.21%, Si 1.5-2.2%, Mn 1.5-2.0%, P<=0.035%, S<=0.010%, Al 0.015-0.060%, N<=0.0060%, Nb 0.010-0.050%, Ti 0.010-0.060%, Ca<=0.0050%, Fe and unavoidable impurities, which is processed in the following steps: a, smelting according to the above mentioned components, casting to form slabs, b, heating the slabs to 1100-1250DEG C, hot-rolling the slabs in the austenitic area and over 80% of them are deformed and the final temperature is 800-900DEG C, d, the final rolled steel is cooled to 650-780DEG C in the speed of 50deg.C / s and air cooled for 6-15 seconds, e, cooling them to 350-450deg.C in the speed over 50deg.C / s, f, rolling them and air cooling them to room temperature.

Description

Technical field [0001] The invention belongs to the field of metal materials, and particularly relates to iron-based alloys containing C, Si, Mn, Nb, and Ti. It is a high-strength hot-rolled bulletproof steel plate without heat treatment and its manufacturing method. This steel plate is particularly suitable for use as a bulletproof material for money transport vehicles. Background technique [0002] Bulletproof cash transport vehicles and other bulletproof vehicles, such as mobile banking vehicles, private bulletproof cars, police bulletproof patrol vehicles, anti-riot vehicles, anti-riot vehicles, etc., are their most basic requirements. In order to achieve the purpose of bulletproof, bulletproof steel plate is generally used as the key material for protection. [0003] The main function of bullet-proof steel plate is to prevent bullets from penetrating the steel plate. Increasing the thickness of the steel plate increases the energy required for projectiles to penetrate the st...

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