Technical Data Sheet: Alloy 1.4742
General information:
Alloy: 1.4742, also known as X10CrAlSi18
Classification: Martensitic stainless steel
Applications: High-temperature applications, heat exchangers, catalytic converters, chemical industry
Chemical composition:
Carbon (C): max. 0.10%
Silicon (Si): max. 1.00%
Manganese (Mn): max. 1.00%
Phosphorus (P): max. 0.04%
Sulfur (S): max. 0.03%
Chromium (Cr): 17.00–19.00%
Aluminium (Al): 1.50–2.50%
Nitrogen (N): max. 0.11%
Physical properties:
Density: 7.80 g/cm³
Melting range: 1410–1450°C
Thermal conductivity: 20–25 W/(m·K)
Electrical conductivity: 15–20% IACS
Mechanical properties:
Tensile strength: 600–800 MPa
Yield strength: 400–600 MPa
Elongation at break: 20–30%
Hardness: 20–25 HRC (Rockwell C)
Heat treatment:
Annealing: Between 750°C and 800°C for 2–4 hours, followed by slow cooling in furnace air.
Corrosion resistance:Alloy 1.4742 offers good resistance to atmospheric corrosion, especially at elevated temperatures. However, it is not suitable for use in aggressive environments with strong acids or chloride ions.
Weldability: Alloy 1.4742 has good weldability. Before welding, however, proper preparation of the weld seam, including preheating and post-treatment, should be ensured in order to avoid unwanted stresses and cracking.
Note: This information is intended as general guidance only and should not be used as the sole basis for design decisions. Before using Alloy 1.4742 in specific applications, it is recommended to obtain more detailed information from manufacturers or technical specialists.
