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, in particular to an iron-based alloy containing C, Si, Mn, Nb and Ti. It is a high-strength hot-rolled bulletproof steel plate without heat treatment and a manufacturing method thereof, and the steel plate is especially suitable for being used as a bulletproof material for cash transport vehicles. Background technique [0002] Bulletproof cash transport vehicles and other bulletproof vehicles, such as mobile bank vehicles, private bulletproof cars, police bulletproof patrol vehicles, riot vehicles, riot vehicles, etc., bulletproof is their most basic requirement. 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 the bulletproof steel plate is to prevent bullets from penetrating the steel plate. Increasing the thickness of the steel plate increases the energy required for the projectile to pene...

AI Technical Summary

Problems solved by technology

[0010] The bullet-proof steel of cash transport vehicles is generally not more than 3mm. The steel plate with quenching and low-temperature tempering has high strength and low plasticity, and the plate shape and cold working performance are poor. The strength of the heat-affected zone after welding will decrease and the bulletproof performance will also decrease; There are many alloy elements such as Cr, Mo, Ni, etc., and the production cost is high after heat treatment

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