EN 1.4405 (GX4CrNiMo16-5-1) Cast Stainless Steel
EN 1.4405 stainless steel is a martensitic stainless steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.4405 is the EN numeric designation for this material. GX4CrNiMo16-5-1 is the EN chemical designation.
It has a fairly high base cost among cast martensitic stainless steels. In addition, it has a moderately low electrical conductivity and a moderately low thermal conductivity.
The graph bars on the material properties cards below compare EN 1.4405 stainless steel to: cast martensitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
17 %
Fatigue Strength
370 MPa 54 x 103 psi
Impact Strength: V-Notched Charpy
68 J 50 ft-lb
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
860 MPa 120 x 103 psi
Tensile Strength: Yield (Proof)
610 MPa 89 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
410 °C 760 °F
Maximum Temperature: Mechanical
870 °C 1600 °F
Melting Completion (Liquidus)
1450 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2550 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
17 W/m-K 9.8 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
13 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
39 MJ/kg 17 x 103 BTU/lb
Embodied Water
130 L/kg 15 gal/lb
Common Calculations
PREN (Pitting Resistance)
20
Resilience: Ultimate (Unit Rupture Work)
130 MJ/m3
Resilience: Unit (Modulus of Resilience)
950 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
31 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
4.6 mm2/s
Thermal Shock Resistance
29 points
Alloy Composition
Among cast stainless steels, the composition of EN 1.4405 stainless steel is notable for containing a comparatively high amount of molybdenum (Mo). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties.
| Fe | 73.6 to 80.3 | |
| Cr | 15 to 17 | |
| Ni | 4.0 to 6.0 | |
| Mo | 0.7 to 1.5 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 0.8 | |
| C | 0 to 0.060 | |
| P | 0 to 0.035 | |
| S | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ISO 11972: Corrosion-resistant cast steels for general applications
EN 10283: Corrosion resistant steel castings
ISO 4991: Steel castings for pressure purposes
EN 10293: Steel castings - Steel castings for general engineering uses
Welding Metallurgy, 2nd ed., Sindo Kou, 2003
Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010