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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.

Iron (Fe) 23 to 38.9
Chromium (Cr) 19 to 22
Cobalt (Co) 18.5 to 22
Nickel (Ni) 18 to 22
Molybdenum (Mo) 2.5 to 3.0
Tungsten (W) 2.0 to 3.0
Manganese (Mn) 0 to 2.0
Niobium (Nb) 0.75 to 1.3
Carbon (C) 0.35 to 0.65
Silicon (Si) 0 to 1.0
Phosphorus (P) 0 to 0.040
Sulfur (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