EN 1.6511 (36CrNiMo4) Steel
EN 1.6511 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.6511 is the EN numeric designation for this material. 36CrNiMo4 is the EN chemical designation.
It has a very low thermal conductivity among EN wrought alloy steels. In addition, it has a moderately high base cost and a fairly high tensile strength.
The graph bars on the material properties cards below compare EN 1.6511 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
300
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
12 %
Fatigue Strength
480 MPa 70 x 103 psi
Impact Strength: V-Notched Charpy
37 J 28 ft-lb
Poisson's Ratio
0.29
Rockwell C Hardness
55
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
600 MPa 87 x 103 psi
Tensile Strength: Ultimate (UTS)
990 MPa 140 x 103 psi
Tensile Strength: Yield (Proof)
770 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
430 °C 800 °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
36 W/m-K 21 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
3.1 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.6 kg CO2/kg material
Embodied Energy
21 MJ/kg 9.1 x 103 BTU/lb
Embodied Water
53 L/kg 6.3 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
1590 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
35 points
Strength to Weight: Bending
28 points
Thermal Diffusivity
9.9 mm2/s
Thermal Shock Resistance
29 points
Alloy Composition
Among alloy steels, the composition of EN 1.6511 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 | 95.6 to 97.2 | |
| Ni | 0.9 to 1.2 | |
| Cr | 0.9 to 1.2 | |
| Mn | 0.5 to 0.8 | |
| C | 0.32 to 0.4 | |
| Mo | 0.15 to 0.3 | |
| Si | 0 to 0.4 | |
| P | 0 to 0.035 | |
| S | 0 to 0.035 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10297-1: Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 1: Non-alloy and alloy steel tubes
EN 10250-3: Open die steel forgings for general engineering purposes - Part 3: Alloy special steels
Welding Metallurgy, 2nd ed., Sindo Kou, 2003
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