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EN 1.6958 (26NiCrMo14-6) Nickel-Chromium Steel

EN 1.6958 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.6958 is the EN numeric designation for this material. 26NiCrMo14-6 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 very high electrical conductivity.

The graph bars on the material properties cards below compare EN 1.6958 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

340

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

16 %

Fatigue Strength

700 MPa 100 x 103 psi

Impact Strength: V-Notched Charpy

63 J 46 ft-lb

Poisson's Ratio

0.29

Reduction in Area

56 %

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

700 MPa 100 x 103 psi

Tensile Strength: Ultimate (UTS)

1140 MPa 170 x 103 psi

Tensile Strength: Yield (Proof)

1070 MPa 160 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

450 °C 830 °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

47 W/m-K 27 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

5.0 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

2.0 kg CO2/kg material

Embodied Energy

27 MJ/kg 12 x 103 BTU/lb

Embodied Water

60 L/kg 7.2 gal/lb

Common Calculations

PREN (Pitting Resistance)

2.9

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

3050 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

40 points

Strength to Weight: Bending

31 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

39 points

Alloy Composition

Among alloy steels, the composition of EN 1.6958 steel is notable for including aluminum (Al) and vanadium (V). Aluminum is used to control grain size and to deoxidize. Deoxidizing is required to control the effects of some other alloying elements. Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.

Iron (Fe) 92.6 to 94.5
Nickel (Ni) 3.3 to 3.8
Chromium (Cr) 1.2 to 1.7
Molybdenum (Mo) 0.35 to 0.55
Manganese (Mn) 0.2 to 0.5
Carbon (C) 0.25 to 0.3
Silicon (Si) 0.15 to 0.3
Vanadium (V) 0 to 0.12
Aluminum (Al) 0.0050 to 0.050
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 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

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

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015

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