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).
| Fe | 93.7 to 95.5 | |
| Ni | 1.8 to 2.2 | |
| Cr | 1.8 to 2.2 | |
| Mn | 0.3 to 0.6 | |
| Mo | 0.3 to 0.5 | |
| C | 0.26 to 0.34 | |
| Si | 0 to 0.4 | |
| P | 0 to 0.035 | |
| 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