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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.

Iron (Fe) 42.6 to 51.9
Nickel (Ni) 23 to 25
Chromium (Cr) 23 to 25
Silicon (Si) 1.0 to 2.5
Niobium (Nb) 0.8 to 1.8
Manganese (Mn) 0 to 2.0
Carbon (C) 0.3 to 0.5
Molybdenum (Mo) 0 to 0.5
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

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