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EN 1.5918 (17CrNi6-6) Nickel-Chromium Steel

EN 1.5918 steel is an alloy steel formulated for primary forming into wrought products. 1.5918 is the EN numeric designation for this material. 17CrNi6-6 is the EN chemical designation.

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

The properties of EN 1.5918 steel include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.5918 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.

F-P Annealed (+FP) 1.5918 Steel Hardened (+H) 1.5918 Steel

Spheroidized (+AC) 1.5918 Steel Spheroidized and Cold Drawn (+AC+C) 1.5918 Steel

Mechanical Properties

Brinell Hardness

160 to 190

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 10⁶ psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

530 to 1390 MPa 77 to 200 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

43 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.4 % relative

Density

7.9 g/cm³ 490 lb/ft³

Embodied Carbon

1.6 kg CO₂/kg material

Embodied Energy

21 MJ/kg 9.2 x 10³ BTU/lb

Embodied Water

56 L/kg 6.7 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 to 49 points

Strength to Weight: Bending

18 to 35 points

Thermal Diffusivity

12 mm²/s

Thermal Shock Resistance

15 to 41 points

Alloy Composition

Among alloy steels, the composition of EN 1.5918 steel is notable for including copper (Cu) and nickel (Ni). Copper is used to improve corrosion resistance, and to add at least some degree of precipitation hardenability. Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat.

Iron (Fe)Fe		94.9 to 96.6
Nickel (Ni)Ni		1.4 to 1.7
Chromium (Cr)Cr		1.4 to 1.7
Manganese (Mn)Mn		0.5 to 0.9
Carbon (C)C		0.14 to 0.2
Silicon (Si)Si		0 to 0.3
Copper (Cu)Cu		0 to 0.25
Phosphorus (P)P		0 to 0.025
Sulfur (S)S		0 to 0.025