X22CrMoV12-1 (1.4923) stainless steel 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 components for steam turbines, nuclear reactors, pressure vessels, and heat-resistant bolting. 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 (in QT condition)

Properties 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)
Coefficient of thermal expansion 10.5–12.5 µm/m·K (20-600°C)
Magnetism Magnetic
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Heat treatments

• Quenching: 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 quenching, tempering must be performed quickly 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 quenched, 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 Defense: 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.