30CrNi3MoV(675) steel plate is a high-strength alloy steel renowned for its exceptional combination of yield strength (≥675 MPa), toughness, and hardenability, making it a critical material in demanding industrial applications. The designation "30CrNi3MoV" reflects its chemical composition (0.30% C, 1.4–1.8% Cr, 2.75–3.25% Ni, 0.25–0.40% Mo, 0.15–0.30% V), while "(675)" typically denotes its minimum yield strength. Below is a comprehensive analysis of its technical specifications, manufacturing processes, applications, and market dynamics:

1. Technical Specifications

Chemical Composition

Carbon (C): 0.27–0.33%
Provides hardenability and strength.

Chromium (Cr): 1.40–1.80%
Enhances corrosion resistance and wear resistance.

Nickel (Ni): 2.75–3.25%
Improves toughness, ductility, and low-temperature performance.

Molybdenum (Mo): 0.25–0.40%
Increases creep resistance and suppresses temper embrittlement.

Vanadium (V): 0.15–0.30%
Refines grain structure for improved strength and fatigue resistance.

Mechanical Properties

Yield Strength (σ₀.₂): ≥675 MPa (for plate thickness ≤100 mm)
Ensures structural stability under high loads.

Tensile Strength (σ_b): 835–980 MPa
Resists plastic deformation in extreme conditions.

Elongation (A₅): ≥15%
Provides ductility for forming and welding.

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

Hardness: 241–285 HB (after quenching and tempering)
Balances wear resistance and machinability.

Heat Treatment

Quenching: Oil-quenched at 850–880°C to achieve martensitic structure.

Tempering: Conducted at 580–680°C to optimize strength-toughness balance.
Example: A 50 mm thick plate tempered at 650°C achieves yield strength of 720 MPa.

 

 

 

 

 

 

 

 

 

 

 

 

 

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