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EN 1.4807 (GX40NiCrSiNb35-18) Cast Stainless Steel

EN 1.4807 stainless steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 1.4807 is the EN numeric designation for this material. GX40NiCrSiNb35-18 is the EN chemical designation.

It has a very low ductility among cast austenitic stainless steels. In addition, it has a moderately low thermal conductivity and a fairly low tensile strength.

The graph bars on the material properties cards below compare EN 1.4807 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

190 GPa 28 x 106 psi

Elongation at Break

4.5 %

Fatigue Strength

120 MPa 17 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

75 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

480 MPa 69 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

600 °C 1110 °F

Maximum Temperature: Mechanical

1000 °C 1830 °F

Melting Completion (Liquidus)

1390 °C 2540 °F

Melting Onset (Solidus)

1350 °C 2460 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 6.9 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

39 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

6.8 kg CO2/kg material

Embodied Energy

97 MJ/kg 42 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

PREN (Pitting Resistance)

19

Resilience: Ultimate (Unit Rupture Work)

18 MJ/m3

Resilience: Unit (Modulus of Resilience)

160 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.4807 stainless steel is notable for containing a comparatively high amount of nickel (Ni) and including niobium (Nb). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe) 36.6 to 46.7
Nickel (Ni) 34 to 36
Chromium (Cr) 17 to 20
Silicon (Si) 1.0 to 2.5
Niobium (Nb) 1.0 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

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

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