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EN 1.6228 (15NiMn6) Nickel Steel

EN 1.6228 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.6228 is the EN numeric designation for this material. 15NiMn6 is the EN chemical designation.

It has a moderately high density among EN wrought alloy steels. In addition, it has a very high thermal conductivity and a fairly low tensile strength.

The graph bars on the material properties cards below compare EN 1.6228 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

170

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

25 %

Fatigue Strength

280 MPa 41 x 103 psi

Impact Strength: V-Notched Charpy

65 J 48 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

360 MPa 52 x 103 psi

Tensile Strength: Ultimate (UTS)

570 MPa 82 x 103 psi

Tensile Strength: Yield (Proof)

390 MPa 56 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

400 °C 760 °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

51 W/m-K 29 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.8 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.6 kg CO2/kg material

Embodied Energy

21 MJ/kg 9.2 x 103 BTU/lb

Embodied Water

50 L/kg 5.9 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

400 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among alloy steels, the composition of EN 1.6228 steel is notable for containing a comparatively high amount of manganese (Mn). Manganese is used to improve hardenability, hot workability, and surface quality. There is some loss of ductility and weldability, however.

Iron (Fe) 96.2 to 97.9
Nickel (Ni) 1.3 to 1.7
Manganese (Mn) 0.8 to 1.5
Silicon (Si) 0 to 0.35
Carbon (C) 0 to 0.18
Vanadium (V) 0 to 0.050
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10028-4: Flat products made of steels for pressure purposes - Part 4: Nickel alloy steels with specified low temperature properties

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