MakeItFrom.com
Menu (ESC)

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).

Iron (Fe) 95.6 to 97.2
Nickel (Ni) 0.9 to 1.2
Chromium (Cr) 0.9 to 1.2
Manganese (Mn) 0.5 to 0.8
Carbon (C) 0.32 to 0.4
Molybdenum (Mo) 0.15 to 0.3
Silicon (Si) 0 to 0.4
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 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