X22CrMoV12-1 stainless steel (1.4923) is a high-temperature resistant steel enriched with molybdenum and a small addition of vanadium to improve creep resistance and mechanical strength at high temperatures.
It is the standard material for the construction of steam turbine components, nuclear reactors, pressure vessels and heat-resistant fasteners. Thanks to its hardenable martensitic structure, 1.4923 offers excellent mechanical properties after quenching and tempering.

Reference standards:

• EN 1.4923 – X22CrMoV12-1
• DIN 17240 1.4923
• VD TÜV Blatt 110
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Chemical composition (%)

Element Min (%) Max (%)
Carbon (C) 0.18 0.24
Chromium (Cr) 11.0 12.5
Nickel (Ni) 0.30 0.80
Molybdenum (Mo) 0.80 1.20
Vanadium (V) – 0.30
Iron (Fe) Balance
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Mechanical Properties (QT condition)

Property QT800 (Spec/Typical) QT900 (Spec/Typical)
Yield Strength Rp0.2% (N/mm²) ≥600 / 675 ≥700 / 800
Tensile Strength Rm (N/mm²) 800–900 / 880 900–1050 / 960
Elongation A5 (%) ≥14 / 17 ≥11 / 15
Impact Energy (ISO-V, J at 25°C) ≥52 –
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Physical properties

Property Value
Density 7.7 g/cm³
Electrical Resistivity (20°C) 0.60 µΩ·m
Thermal Conductivity 24 W/m·K (20°C) – 29 W/m·K (650°C)
Specific Heat 460 J/kg·K (20°C) – 540 J/kg·K (800°C)
Thermal Expansion Coefficient 10.5–12.5 µm/m·K (20-600°C)
Magnetism Magnetisable
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Heat treatments

• Hardening: Heating to 1020–1070°C, followed by quenching in air, oil or polymer.
• Tempering: Between 640–740°C to achieve the optimal combination of mechanical strength and toughness.
• Stress Relieving: 600–680°C after welding or heavy machining.
• Notes: After hardening, tempering must be carried out rapidly to reduce the risk of cracking.
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Available forms

• Wire
• Drawn and peeled bars (Ø 5–75 mm)
• Hot-rolled bars
• Cold-rolled bars in coils
• Supply conditions: solution annealed and hardened, quenched and tempered, pickled, straightened, peeled, ground.
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Industrial applications

Thanks to its mechanical strength at high temperatures and resistance to steam corrosion, X22CrMoV12-1 is used in the following sectors:
• Aerospace and Defence: Components for gas and steam turbines.
• Power Generation: Pressure vessels, boilers and heat exchangers.
• Chemical Industry: Heat-resistant reactors.
• Motorsport: Components subject to high temperatures.
• Nuclear: Radiation-resistant structures and piping.
• Oil & Gas: High-pressure valves and fittings.