26SiMnMo(GY5) grade steel plate is a high-strength, high-toughness armored ballistic steel primarily used in military and security applications. Designated as GY5 under the Chinese military standard GJB 1496B-2014, it combines exceptional ballistic resistance with weldability and machinability, making it ideal for armored vehicles, blast-resistant structures, and critical infrastructure requiring protection against firearms and explosives. Below is a comprehensive analysis of its technical specifications, applications, and manufacturing processes:

1. Technical Specifications

Chemical Composition

Carbon (C): 0.23–0.29%
Provides hardenability and strength.

Silicon (Si): 1.20–1.60%
Enhances toughness and resistance to oxidation.

Manganese (Mn): 1.20–1.60%
Improves hardenability and wear resistance.

Molybdenum (Mo): 0.15–0.25%
Suppresses temper embrittlement and increases creep resistance.

Phosphorus (P) & Sulfur (S): ≤0.030% each
weldability and ductility.

 

 

 

 

 

 

 

 

Mechanical Properties

Yield Strength (σ₀.₂): ≥1500 MPa
Withstands extreme dynamic loads from ballistic impacts.

Tensile Strength (σ_b): ≥1650 MPa
Resists plastic deformation under high stress.

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

Hardness: 375–514 HB (Brinell)
Provides surface hardness to resist penetration.

Impact Energy (KV₂ at -20°C): ≥50 J
Maintains toughness in cold environments.

Ballistic Performance

Resistance: Effectively withstands rifle rounds (e.g., 85 式狙击步枪,AK-47) and fragmentation.

Testing: Requires 100% ultrasonic testing (UT) and live-fire trials using standardized targets (500×600 mm or 600×900 mm).

 

 

 

 

 

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