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EN 1.6580 (30CrNiMo8) Steel

EN 1.6580 steel is an alloy steel formulated for primary forming into wrought products. 1.6580 is the EN numeric designation for this material. 30CrNiMo8 is the EN chemical designation.

It has a moderately high density among EN wrought alloy steels. In addition, it has a very high base cost and a fairly high electrical conductivity.

The properties of EN 1.6580 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 1.6580 steel to: EN wrought 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

220 to 350

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

11 to 19 %

Fatigue Strength

310 to 610 MPa 45 to 89 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

450 to 700 MPa 65 to 100 x 103 psi

Tensile Strength: Ultimate (UTS)

720 to 1170 MPa 100 to 170 x 103 psi

Tensile Strength: Yield (Proof)

460 to 990 MPa 66 to 140 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

450 °C 850 °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

7.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.3 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.8 kg CO2/kg material

Embodied Energy

23 MJ/kg 10 x 103 BTU/lb

Embodied Water

59 L/kg 7.0 gal/lb

Common Calculations

PREN (Pitting Resistance)

3.3

Resilience: Ultimate (Unit Rupture Work)

120 to 130 MJ/m3

Resilience: Unit (Modulus of Resilience)

560 to 2590 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

26 to 41 points

Strength to Weight: Bending

23 to 31 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

21 to 34 points

Alloy Composition

Among alloy steels, the composition of EN 1.6580 steel is notable for including nickel (Ni) and containing a comparatively high amount of chromium (Cr). Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat. Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).

Iron (Fe) 93.7 to 95.5
Nickel (Ni) 1.8 to 2.2
Chromium (Cr) 1.8 to 2.2
Manganese (Mn) 0.3 to 0.6
Molybdenum (Mo) 0.3 to 0.5
Carbon (C) 0.26 to 0.34
Silicon (Si) 0 to 0.4
Phosphorus (P) 0 to 0.035
Sulfur (S) 0 to 0.035

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

Followup Questions

Similar Alloys

Further Reading

EN 10297-1: Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 1: Non-alloy and alloy steel tubes

EN 10250-3: Open die steel forgings for general engineering purposes - Part 3: Alloy special steels

EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

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

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