28Cr2Mo(GY4) grade steel plate is a high-strength armored ballistic steel developed for military and security applications, adhering to the Chinese military standard GJB 1496B-2014 . It is specifically designed to withstand high-velocity projectile impacts while maintaining structural integrity, making it critical for armored vehicles, blast-resistant infrastructure, and heavy machinery. Below is a detailed analysis of its technical specifications, manufacturing processes, and applications:

1. Technical Specifications

Chemical Composition

Element	Content (%)	Role
Carbon (C)	0.25–0.31	Enhances hardenability and strength.
Chromium (Cr)	1.80–2.30	Improves corrosion resistance and wear resistance.
Molybdenum (Mo)	0.25–0.35	Suppresses temper embrittlement and increases creep resistance.
Silicon (Si)	0.18–0.35	Enhances toughness and oxidation resistance.
Manganese (Mn)	0.30–0.55	Improves hardenability and wear resistance.
Phosphorus (P)/Sulfur (S)	≤0.030	weldability and ductility.

 

 

 

 

 

 

 

Mechanical Properties

Yield Strength (σ₀.₂): ≥1500 MPa
Resists plastic deformation under extreme dynamic loads.

Tensile Strength (σ_b): 1650–1900 MPa
Provides structural stability in ballistic scenarios.

Elongation (A₅): 8–10%
Balances ductility for forming and welding.

Hardness: 375–514 HB (Brinell)
Surface hardness resists projectile penetration.

Impact Energy (KV₂ at -40°C): ≥50 J
Maintains toughness in cold environments .

 

 

 

 

 

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