EN 1.4008 (GX7CrNiMo12-1) Cast Stainless Steel
EN 1.4008 stainless steel is a martensitic stainless steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.4008 is the EN numeric designation for this material. GX7CrNiMo12-1 is the EN chemical designation.
It has the lowest tensile strength among the cast martensitic stainless steels in the database.
The graph bars on the material properties cards below compare EN 1.4008 stainless steel to: cast martensitic 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
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
17 %
Fatigue Strength
300 MPa 44 x 103 psi
Impact Strength: V-Notched Charpy
31 J 23 ft-lb
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
670 MPa 97 x 103 psi
Tensile Strength: Yield (Proof)
500 MPa 72 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
390 °C 740 °F
Maximum Temperature: Mechanical
760 °C 1400 °F
Melting Completion (Liquidus)
1450 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2560 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
25 W/m-K 14 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
8.0 % relative
Density
7.8 g/cm3 480 lb/ft3
Embodied Carbon
2.1 kg CO2/kg material
Embodied Energy
30 MJ/kg 13 x 103 BTU/lb
Embodied Water
100 L/kg 12 gal/lb
Common Calculations
PREN (Pitting Resistance)
14
Resilience: Ultimate (Unit Rupture Work)
100 MJ/m3
Resilience: Unit (Modulus of Resilience)
630 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
6.7 mm2/s
Thermal Shock Resistance
23 points
Alloy Composition
Among cast stainless steels, the composition of EN 1.4008 stainless steel is notable for containing comparatively high amounts of nickel (Ni) and chromium (Cr). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.
| Fe | 81.8 to 86.8 | |
| Cr | 12 to 13.5 | |
| Ni | 1.0 to 2.0 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 1.0 | |
| Mo | 0.2 to 0.5 | |
| C | 0 to 0.1 | |
| P | 0 to 0.035 | |
| S | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ISO 11972: Corrosion-resistant cast steels for general applications
EN 10283: Corrosion resistant steel castings
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010