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EN 1.4405 (GX4CrNiMo16-5-1) Cast Stainless Steel

EN 1.4405 stainless steel is a martensitic stainless steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.4405 is the EN numeric designation for this material. GX4CrNiMo16-5-1 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 a moderately low thermal conductivity.

The graph bars on the material properties cards below compare EN 1.4405 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

200 GPa 29 x 106 psi

Elongation at Break

17 %

Fatigue Strength

370 MPa 54 x 103 psi

Impact Strength: V-Notched Charpy

68 J 50 ft-lb

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

860 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

610 MPa 89 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

410 °C 760 °F

Maximum Temperature: Mechanical

870 °C 1600 °F

Melting Completion (Liquidus)

1450 °C 2630 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.8 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % 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 15 gal/lb

Common Calculations

PREN (Pitting Resistance)

20

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

950 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

31 points

Strength to Weight: Bending

26 points

Thermal Diffusivity

4.6 mm2/s

Thermal Shock Resistance

29 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.4405 stainless steel is notable for containing a comparatively high amount of molybdenum (Mo). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties.

Iron (Fe) 73.6 to 80.3
Chromium (Cr) 15 to 17
Nickel (Ni) 4.0 to 6.0
Molybdenum (Mo) 0.7 to 1.5
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 0.8
Carbon (C) 0 to 0.060
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

ISO 11972: Corrosion-resistant cast steels for general applications

EN 10283: Corrosion resistant steel castings

ISO 4991: Steel castings for pressure purposes

EN 10293: Steel castings - Steel castings for general engineering uses

Welding Metallurgy, 2nd ed., Sindo Kou, 2003

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010