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EN 1.6570 (G32NiCrMo8-5-4) Cast Steel

EN 1.6570 steel is an alloy steel formulated for casting. 1.6570 is the EN numeric designation for this material. G32NiCrMo8-5-4 is the EN chemical designation.

It can have a very high tensile strength among cast alloy steels. In addition, it can have a moderately low ductility and has a moderately high electrical conductivity.

The properties of EN 1.6570 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 1.6570 steel to: cast alloy 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

270 to 340

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

11 to 17 %

Fatigue Strength

500 to 660 MPa 73 to 96 x 103 psi

Impact Strength: V-Notched Charpy

40 to 48 J 29 to 36 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

910 to 1130 MPa 130 to 160 x 103 psi

Tensile Strength: Yield (Proof)

760 to 1060 MPa 110 to 150 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

440 °C 820 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.9 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.7 kg CO2/kg material

Embodied Energy

23 MJ/kg 9.9 x 103 BTU/lb

Embodied Water

56 L/kg 6.7 gal/lb

Common Calculations

PREN (Pitting Resistance)

2.5

Resilience: Ultimate (Unit Rupture Work)

120 to 140 MJ/m3

Resilience: Unit (Modulus of Resilience)

1520 to 3010 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

32 to 40 points

Strength to Weight: Bending

27 to 31 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

27 to 33 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.6570 steel is notable for containing comparatively high amounts of chromium (Cr) and nickel (Ni). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures). Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat.

Iron (Fe) 94 to 96.2
Nickel (Ni) 1.6 to 2.1
Chromium (Cr) 1.0 to 1.4
Manganese (Mn) 0.6 to 1.0
Molybdenum (Mo) 0.3 to 0.5
Carbon (C) 0.28 to 0.35
Silicon (Si) 0 to 0.6
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.015

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

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

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015