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EN 1.6773 (36NiCrMo16) Steel

EN 1.6773 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.6773 is the EN numeric designation for this material. 36NiCrMo16 is the EN chemical designation.

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

The graph bars on the material properties cards below compare EN 1.6773 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

11 %

Fatigue Strength

560 MPa 81 x 103 psi

Impact Strength: V-Notched Charpy

38 J 28 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

670 MPa 97 x 103 psi

Tensile Strength: Ultimate (UTS)

1120 MPa 160 x 103 psi

Tensile Strength: Yield (Proof)

910 MPa 130 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

450 °C 850 °F

Melting Completion (Liquidus)

1460 °C 2650 °F

Melting Onset (Solidus)

1420 °C 2580 °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

8.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

5.0 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.9 kg CO2/kg material

Embodied Energy

26 MJ/kg 11 x 103 BTU/lb

Embodied Water

61 L/kg 7.3 gal/lb

Common Calculations

PREN (Pitting Resistance)

3.0

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

2210 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

40 points

Strength to Weight: Bending

30 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

33 points

Alloy Composition

Among alloy steels, the composition of EN 1.6773 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).

Iron (Fe) 92 to 93.9
Nickel (Ni) 3.6 to 4.1
Chromium (Cr) 1.6 to 2.0
Manganese (Mn) 0.3 to 0.6
Carbon (C) 0.32 to 0.39
Molybdenum (Mo) 0.25 to 0.45
Silicon (Si) 0 to 0.4
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.025

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

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