EN 1.4740 (GX40CrSi17) Cast Stainless Steel
EN 1.4740 stainless steel is a ferritic stainless steel formulated for casting. Cited properties are appropriate for the annealed condition. 1.4740 is the EN numeric designation for this material. GX40CrSi17 is the EN chemical designation.
It has the highest ductility among the cast ferritic stainless steels in the database.
The graph bars on the material properties cards below compare EN 1.4740 stainless steel to: cast ferritic 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
260
Elastic (Young's, Tensile) Modulus
200 GPa 28 x 106 psi
Elongation at Break
22 %
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
410 °C 760 °F
Maximum Temperature: Mechanical
900 °C 1650 °F
Melting Completion (Liquidus)
1420 °C 2580 °F
Melting Onset (Solidus)
1370 °C 2510 °F
Specific Heat Capacity
490 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
18 W/m-K 10 BTU/h-ft-°F
Thermal Expansion
10 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
7.6 g/cm3 480 lb/ft3
Embodied Carbon
2.3 kg CO2/kg material
Embodied Energy
32 MJ/kg 14 x 103 BTU/lb
Embodied Water
120 L/kg 15 gal/lb
Common Calculations
PREN (Pitting Resistance)
18
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Thermal Diffusivity
4.8 mm2/s
Alloy Composition
Among cast stainless steels, the composition of EN 1.4740 stainless steel is notable for containing a comparatively high amount of silicon (Si). Silicon content is typically governed by metallurgical processing concerns, but it can also be added for the purpose of improving oxidation resistance.
| Fe | 75.4 to 82.7 | |
| Cr | 16 to 19 | |
| Si | 1.0 to 2.5 | |
| Mn | 0 to 1.0 | |
| Ni | 0 to 1.0 | |
| 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
Metallic Materials: Physical, Mechanical, and Corrosion Properties, Philip A. Schweitzer, 2003
Creep-Resistant Steels, Fujio Abe et al. (editors), 2008
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010