EN 1.4874 (GX50NiCrCo20-20-20) Cast Stainless Steel
EN 1.4874 stainless steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 1.4874 is the EN numeric designation for this material. GX50NiCrCo20-20-20 is the EN chemical designation.
It has the highest base cost among cast austenitic stainless steels. In addition, it has the highest embodied energy and a fairly low tensile strength.
The graph bars on the material properties cards below compare EN 1.4874 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
140
Elastic (Young's, Tensile) Modulus
210 GPa 30 x 106 psi
Elongation at Break
6.7 %
Fatigue Strength
180 MPa 26 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
80 GPa 12 x 106 psi
Tensile Strength: Ultimate (UTS)
480 MPa 69 x 103 psi
Tensile Strength: Yield (Proof)
360 MPa 52 x 103 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
560 °C 1030 °F
Maximum Temperature: Mechanical
1150 °C 2100 °F
Melting Completion (Liquidus)
1450 °C 2650 °F
Melting Onset (Solidus)
1400 °C 2560 °F
Specific Heat Capacity
450 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
13 W/m-K 7.3 BTU/h-ft-°F
Thermal Expansion
15 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
70 % relative
Density
8.4 g/cm3 520 lb/ft3
Embodied Carbon
7.6 kg CO2/kg material
Embodied Energy
110 MJ/kg 46 x 103 BTU/lb
Embodied Water
290 L/kg 35 gal/lb
Common Calculations
PREN (Pitting Resistance)
34
Resilience: Ultimate (Unit Rupture Work)
29 MJ/m3
Resilience: Unit (Modulus of Resilience)
310 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
16 points
Strength to Weight: Bending
16 points
Thermal Diffusivity
3.3 mm2/s
Thermal Shock Resistance
11 points
Alloy Composition
Among cast stainless steels, the composition of EN 1.4874 stainless steel is notable for including cobalt (Co) and tungsten (W). Cobalt is used to improve mechanical strength at elevated temperatures. Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects.
| Fe | 23 to 38.9 | |
| Cr | 19 to 22 | |
| Co | 18.5 to 22 | |
| Ni | 18 to 22 | |
| Mo | 2.5 to 3.0 | |
| W | 2.0 to 3.0 | |
| Mn | 0 to 2.0 | |
| Nb | 0.75 to 1.3 | |
| C | 0.35 to 0.65 | |
| Si | 0 to 1.0 | |
| 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
Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012
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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015