15MnV Steel Properties

15MnV is a low-alloy high-strength structural steel specified in Chinese standards (e.g., GB/T 1591). It is widely used in construction, bridges, and heavy machinery due to its balanced combination of strength, toughness, and weldability. Below is a detailed overview of its properties and applications:

I. Chemical Composition

Element	Content (wt%)
Carbon (C)	0.12–0.18%
Manganese (Mn)	1.20–1.60%
Vanadium (V)	0.04–0.12%
Silicon (Si)	≤0.55%
Phosphorus (P)	≤0.035%
Sulfur (S)	≤0.035%

 

Key Alloying Elements:

 

Manganese (Mn): Enhances strength and hardenability.

Vanadium (V): Refines grain structure and improves precipitation hardening, boosting strength and toughness.

II. Mechanical Properties

Yield Strength (ReH):

≥390 MPa (for thickness ≤16 mm)

≥370 MPa (for thickness 16–40 mm)

Tensile Strength (Rm): 530–685 MPa

Elongation (A): ≥18%

Impact Toughness:

Akv (longitudinal): ≥47 J at 20°C (adequate for moderate-temperature applications).

III. Physical Properties

Density: ~7.85 g/cm³

Thermal Conductivity: ~48 W/(m·K) (at room temperature)

Coefficient of Thermal Expansion: ~12×10⁻⁶/°C (20–100°C)

IV. Performance Characteristics

High Strength:

Microalloying with V increases strength via grain refinement and precipitation of vanadium carbides/nitrides.

Good Weldability:

Low carbon equivalent (CEV ≤0.44%) minimizes cracking risk during welding.

Preheating is typically unnecessary for thin sections (<30 mm).

 

 

 

 

 

 

 

 

 

 

 

 

 

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