1.7733 / 24CrMoV5-5 / Heat-Resistant Steel

Delivery forms of steel circle 20X3MVF

Steel 20Х3МВФ: Properties, Applications, and Features

✅ General Technical Characteristics

Steel 20Х3МВФ is a heat-resistant, relaxation-resistant steel of the pearlitic class, designed for operation at elevated temperatures up to 560 °C. It is characterized by high strength, resistance to creep and scaling, and limited weldability.

Key Characteristics:

• High heat resistance at temperatures up to 560 °C.
• Resistance to relaxation and creep.
• Limited weldability; requires preheating and subsequent heat treatment.
• Intensive scaling temperature — 600 °C.

🔬 Chemical Composition (%):

• Carbon (C): 0.15–0.23
• Silicon (Si): 0.17–0.37
• Manganese (Mn): 0.25–0.50
• Chromium (Cr): 2.80–3.30
• Molybdenum (Mo): 0.35–0.55
• Tungsten (W): 0.30–0.50
• Vanadium (V): 0.60–0.85
• Nickel (Ni): up to 0.30
• Sulfur (S): up to 0.025
• Phosphorus (P): up to 0.030
• Copper (Cu): up to 0.20

This composition provides the steel with an optimal balance between strength, heat resistance, and creep resistance.

🏭 Applications

Steel 20Х3МВФ is used for manufacturing components operating under elevated temperatures and pressures, particularly in the chemical industry and energy sector.

Main Application Areas:

• Rotors and turbine discs.
• Forgings and bars.
• Fastening elements.
• High-pressure pipes for chemical equipment and hydrogenation units.

📊 Mechanical Properties at 20 °C

• Tensile strength (σ_u): 880 MPa
• Yield strength (σ_y): 735 MPa
• Elongation (δ₅): 12%
• Reduction of area (ψ): 40%
• Impact toughness (KCU): 590 kJ/m²

Heat treatment: quenching at 1030–1060 °C with oil cooling, tempering at 660–700 °C.

⭐ Features

• Heat resistance: Ensures reliable operation of components at temperatures up to 560 °C.
• Creep resistance: Allows prolonged use without significant deformation under load.
• Limited weldability: Requires preheating to 100–120 °C and subsequent heat treatment to ensure the quality of welded joints.
• Scaling resistance: The intensive scaling temperature is 600 °C, allowing the steel to be used in high-temperature conditions without significant loss of properties.

Steel 20Х3МВФ is an optimal choice for manufacturing components operating under high temperatures and pressures, ensuring reliability and durability in service.