General information:
Alloy: 1.4438, also known as X2CrNiMo18-15-4
Chemical composition: 17–19% chromium, 13–15% nickel, 2–2.5% molybdenum, <0.03% carbon, <2% manganese, <1% silicon, <0.045% phosphorus, <0.015% sulfur, <0.1% nitrogen, balance iron
Standards: EN 10088-3, ASTM A240/A240M, UNS S31703
Mechanical properties:
Tensile strength: 530–730 MPa
Yield strength: ≥ 220 MPa
Elongation at break: ≥ 35%
Hardness: ≤ 220 HB
Modulus of elasticity: 200 GPa
Physical properties:
Density: 7.9 g/cm³
Melting point: 1370–1400°C
Thermal conductivity: 15 W/(m·K)
Electrical conductivity: 0.75 × 10⁶ S/m
Magnetizability: non-magnetic
Corrosion resistance:
High resistance to corrosive media such as water, seawater, sulfur-containing compounds, acids, such as sulfuric acid and nitric acid, and alkalis, such as sodium hydroxide
Suitable for applications in saline environments and marine applications
Good resistance to pitting corrosion and stress corrosion cracking
Heat treatment:Solution annealing at 1050–1150°C, followed by rapid quenching in water or air
Applications:
Chemical industry: piping systems, heat exchangers, valves, tanks, reactors
Food industry: tanks, vessels, piping systems
Shipbuilding: components that require seawater resistance
Oil and gas industry: offshore facilities, pipelines
Pharmaceutical industry: vessels, piping systems
Note: This data sheet is for informational purposes only and is based on the information available at the time of preparation. It is recommended to verify the specific requirements of your application with the relevant standards and manufacturers.
