Technical data sheet: Alloy 1.4742
General information:
Alloy: 1.4742 (also known as X10CrAlSi18)
Classification: Martensitic stainless steel
Areas of application: high-temperature applications, heat exchangers, catalysts, chemical industry
Chemical composition:
Carbon (C): 0.10% max.
Silicon (Si): 1.00% max.
Manganese (Mn): 1.00% max.
Phosphorus (P): 0.04% max.
Sulfur (S): 0.03% max.
Chromium (Cr): 17.00 - 19.00%
Aluminum (Al): 1.50 - 2.50%
Nitrogen (N): 0.11% max.
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 high temperatures. However, it is not suitable for use in aggressive environments with strong acids or chloride ions.
Weldability:
The weldability of the alloy 1.4742 is good. However, prior to welding, proper weld preparation, including preheating and post-weld treatment, should be taken to avoid unwanted stresses and cracks.
Note: This information is provided as a general guide only and should not be used as the sole source for design decisions. Before using 1.4742 alloy in specific applications, it is recommended to obtain more detailed information from manufacturers or experts.
