EN 1.4525 (GX5CrNiCu16-4) Cast Stainless Steel
EN 1.4525 stainless steel is a martensitic stainless steel formulated for casting. 1.4525 is the EN numeric designation for this material. GX5CrNiCu16-4 is the EN chemical designation.
It has a fairly high base cost among cast martensitic stainless steels. In addition, it has a moderately low electrical conductivity and can have the lowest ductility.
The properties of EN 1.4525 stainless steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.4525 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
5.6 to 13 %
Fatigue Strength
480 to 540 MPa 69 to 79 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
1030 to 1250 MPa 150 to 180 x 103 psi
Tensile Strength: Yield (Proof)
840 to 1120 MPa 120 to 160 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
430 °C 810 °F
Maximum Temperature: Mechanical
860 °C 1580 °F
Melting Completion (Liquidus)
1430 °C 2600 °F
Melting Onset (Solidus)
1390 °C 2530 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
18 W/m-K 10 BTU/h-ft-°F
Thermal Expansion
11 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
13 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
39 MJ/kg 17 x 103 BTU/lb
Embodied Water
130 L/kg 16 gal/lb
Common Calculations
PREN (Pitting Resistance)
18
Resilience: Ultimate (Unit Rupture Work)
68 to 130 MJ/m3
Resilience: Unit (Modulus of Resilience)
1820 to 3230 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
36 to 45 points
Strength to Weight: Bending
29 to 33 points
Thermal Diffusivity
4.7 mm2/s
Thermal Shock Resistance
34 to 41 points
Alloy Composition
Among cast stainless steels, the composition of EN 1.4525 stainless steel is notable for including niobium (Nb) and copper (Cu). Niobium is primarily used to improve yield strength, particularly at elevated temperatures. Copper is primarily used to improve resistance to acids.
| Fe | 70.4 to 79 | |
| Cr | 15 to 17 | |
| Ni | 3.5 to 5.5 | |
| Cu | 2.5 to 4.0 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 0.8 | |
| Mo | 0 to 0.8 | |
| Nb | 0 to 0.35 | |
| C | 0 to 0.070 | |
| N | 0 to 0.050 | |
| 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
EN 10283: Corrosion resistant steel castings
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010