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).
| Fe | 92 to 93.9 | |
| Ni | 3.6 to 4.1 | |
| Cr | 1.6 to 2.0 | |
| Mn | 0.3 to 0.6 | |
| C | 0.32 to 0.39 | |
| Mo | 0.25 to 0.45 | |
| Si | 0 to 0.4 | |
| P | 0 to 0.030 | |
| 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