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EN 1.6956 (33NiCrMoV14-5) Nickel-Chromium Steel

EN 1.6956 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.6956 is the EN numeric designation for this material. 33NiCrMoV14-5 is the EN chemical designation.

It has the lowest ductility among EN wrought alloy steels. In addition, it has a moderately high density and a very high base cost.

The graph bars on the material properties cards below compare EN 1.6956 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

370

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

9.6 %

Fatigue Strength

680 MPa 98 x 103 psi

Impact Strength: V-Notched Charpy

25 J 19 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

730 MPa 110 x 103 psi

Tensile Strength: Ultimate (UTS)

1230 MPa 180 x 103 psi

Tensile Strength: Yield (Proof)

1120 MPa 160 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

440 °C 830 °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

46 W/m-K 27 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.0 % 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

2.2 kg CO2/kg material

Embodied Energy

31 MJ/kg 13 x 103 BTU/lb

Embodied Water

60 L/kg 7.1 gal/lb

Common Calculations

PREN (Pitting Resistance)

2.8

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

3320 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

43 points

Strength to Weight: Bending

32 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

36 points

Alloy Composition

Among alloy steels, the composition of EN 1.6956 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) 92.4 to 95.3
Nickel (Ni) 2.9 to 3.8
Chromium (Cr) 1.0 to 1.7
Molybdenum (Mo) 0.3 to 0.6
Carbon (C) 0.28 to 0.38
Manganese (Mn) 0.15 to 0.4
Silicon (Si) 0 to 0.4
Vanadium (V) 0.080 to 0.25
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 10250-3: Open die steel forgings for general engineering purposes - Part 3: Alloy special steels

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