EN 1.4855 (GX40CrNiSiNb24-24) Cast Stainless Steel
EN 1.4855 stainless steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 1.4855 is the EN numeric designation for this material. GX40CrNiSiNb24-24 is the EN chemical designation.
It has a fairly low ductility among cast austenitic stainless steels. In addition, it has a fairly high base cost and a fairly high embodied energy.
The graph bars on the material properties cards below compare EN 1.4855 stainless steel to: cast austenitic 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
Brinell Hardness
150
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
4.6 %
Fatigue Strength
120 MPa 17 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
500 MPa 73 x 103 psi
Tensile Strength: Yield (Proof)
250 MPa 36 x 103 psi
Thermal Properties
Latent Heat of Fusion
320 J/g
Maximum Temperature: Corrosion
610 °C 1130 °F
Maximum Temperature: Mechanical
1050 °C 1920 °F
Melting Completion (Liquidus)
1400 °C 2550 °F
Melting Onset (Solidus)
1350 °C 2460 °F
Specific Heat Capacity
480 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
14 W/m-K 8.1 BTU/h-ft-°F
Thermal Expansion
16 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
34 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
5.9 kg CO2/kg material
Embodied Energy
85 MJ/kg 37 x 103 BTU/lb
Embodied Water
200 L/kg 23 gal/lb
Common Calculations
PREN (Pitting Resistance)
25
Resilience: Ultimate (Unit Rupture Work)
19 MJ/m3
Resilience: Unit (Modulus of Resilience)
160 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
18 points
Strength to Weight: Bending
18 points
Thermal Diffusivity
3.7 mm2/s
Thermal Shock Resistance
11 points
Alloy Composition
Among cast stainless steels, the composition of EN 1.4855 stainless steel is notable for including niobium (Nb) and containing a comparatively high amount of silicon (Si). Niobium is primarily used to improve yield strength, particularly at elevated temperatures. Silicon content is typically governed by metallurgical processing concerns, but it can also be added for the purpose of improving oxidation resistance.
| Fe | 42.6 to 51.9 | |
| Ni | 23 to 25 | |
| Cr | 23 to 25 | |
| Si | 1.0 to 2.5 | |
| Nb | 0.8 to 1.8 | |
| Mn | 0 to 2.0 | |
| C | 0.3 to 0.5 | |
| Mo | 0 to 0.5 | |
| P | 0 to 0.040 | |
| S | 0 to 0.030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10295: Heat Resistant Steel Castings
Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002
Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010