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EN 1.6957 (27NiCrMoV15-6) Nickel-Chromium Steel

EN 1.6957 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.6957 is the EN numeric designation for this material. 27NiCrMoV15-6 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 1.6957 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

280

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

18 %

Fatigue Strength

530 MPa 77 x 103 psi

Impact Strength: V-Notched Charpy

71 J 52 ft-lb

Poisson's Ratio

0.29

Reduction in Area

46 %

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

570 MPa 83 x 103 psi

Tensile Strength: Ultimate (UTS)

930 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

780 MPa 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

450 °C 840 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2590 °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

13 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

2.1 kg CO2/kg material

Embodied Energy

29 MJ/kg 12 x 103 BTU/lb

Embodied Water

60 L/kg 7.2 gal/lb

Common Calculations

PREN (Pitting Resistance)

2.7

Resilience: Ultimate (Unit Rupture Work)

160 MJ/m3

Resilience: Unit (Modulus of Resilience)

1630 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

33 points

Strength to Weight: Bending

27 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

27 points

Alloy Composition

Among alloy steels, the composition of EN 1.6957 steel is notable for including vanadium (V) and nickel (Ni). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering. Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat.

Iron (Fe) 92.7 to 94.7
Nickel (Ni) 3.4 to 4.0
Chromium (Cr) 1.2 to 1.8
Molybdenum (Mo) 0.25 to 0.45
Manganese (Mn) 0.15 to 0.4
Carbon (C) 0.22 to 0.32
Vanadium (V) 0.050 to 0.15
Silicon (Si) 0 to 0.15
Phosphorus (P) 0 to 0.010
Sulfur (S) 0 to 0.0070

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

Microstructure of Steels and Cast Irons, Madeleine Durand-Charre, 2004

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

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