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.
| Fe | 36.6 to 46.7 | |
| Ni | 34 to 36 | |
| Cr | 17 to 20 | |
| Si | 1.0 to 2.5 | |
| Nb | 1.0 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
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