A steel plate for high elastic armor and its manufacturing method

Abstract

The invention relates to an armor steel plate with a high anti-bullet property and a manufacturing method of the armor steel plate. The armor steel plate comprises chemical components in percentage by weight as follows: 0.20%-0.28% of carbon, smaller than or equal to 0.10% of silicon, 0.20%-0.50% of manganese, smaller than or equal to 0.012% of phosphorus, smaller than or equal to 0.003% of sulfur, 0.90%-1.30% of chromium, 0.20%-0.40% of molybdenum, 0.015%-0.035% of titanium, 0.020%-0.050% of aluminum, smaller than or equal to 0.00020% of hydrogen, smaller than or equal to 0.0040% of nitrogen, smaller than or equal to 0.65% of carbon equivalent and the balance of iron and inevitable impurities. The hardness of armor steel with the high anti-bullet property reaches 480-550 HBW, the shock absorption energy at the temperature of subzero 40 DEG C is larger than or equal to 20 J, and the armor steel plate has penetration resistance, can prevent armor steel from cracking, breaking or stripping and has the characteristics of low cost, stable quality, simplified process and easiness in large-scale industrial production.

Description

Technical field [0001] The invention relates to a steel plate for high-resistance armor and a manufacturing method thereof, and belongs to the technical field of steel smelting. [0002] technical background [0003] Because armored steel has advantages in alloy selection, machining, welding costs, industrialized manufacturing recycling, multiple attack protection, and manufacturing difficulty, armored ballistic steel is widely used in the military. In the civil field, armored steel can be used to manufacture civil vehicle shields and explosion-proof shells, hard body armor, public security explosion-proof vehicles, currency transport vehicles, etc. Therefore, high-performance armored ballistic steel has a broad application prospect in the civil field. [0004] Armored steel plates are required to have high hardness, high yield strength, high tensile strength and certain elongation and toughness indicators. High-hardness steel is used to destroy projectiles to ensure penetration res...

AI Technical Summary

Problems solved by technology

[0008] 1. Adopting high carbon content and carbon equivalent composition design, there must be hardening and cracking during the welding process, and the weldability is poor;

[0009] 2. Increase the hardness, and the strength of the steel will also increase accordingly, but its impact toughness and fracture toughness will decrease sharply, and the material will become brittle, so that it cannot bear the impact load of the huge energy of the shell, resulting in fragmentation and collapse. It is difficult to guarantee the armor steel. Anti-ballistic properties;

[0010] 3. A large amount of alloying elements Ni and Co, Zr, RE, W and other rare elements are added to enhance the low-temperature toughness and plasticity of the steel. The complex composition system will inevitably bring many types of alloys to the smelting production, difficult operation, easy cracking of billets, and high cost. high downside;

[0011] 4. Electroslag remelting, strong magnetic field and oil quenching are not the standing conditions for large-scale production of iron and steel enterprises, which increase the complexity of the production process and are not suitable for wide application

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