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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.

Iron (Fe) 70.4 to 79
Chromium (Cr) 15 to 17
Nickel (Ni) 3.5 to 5.5
Copper (Cu) 2.5 to 4.0
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 0.8
Molybdenum (Mo) 0 to 0.8
Niobium (Nb) 0 to 0.35
Carbon (C) 0 to 0.070
Nitrogen (N) 0 to 0.050
Phosphorus (P) 0 to 0.035
Sulfur (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