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Core Hardened (+CH) 1.7220 Steel

EN 1.7220 +CH steel is EN 1.7220 steel in the core hardened (CH) condition. It has the second highest strength compared to the other variants of EN 1.7220 steel. The graph bars on the material properties cards below compare EN 1.7220 +CH 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

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Poisson's Ratio

0.29

Rockwell C Hardness

45

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

1460 MPa 210 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 800 °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

44 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.5 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.5 x 103 BTU/lb

Embodied Water

51 L/kg 6.1 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

52 points

Strength to Weight: Bending

36 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

43 points

Alloy Composition

Iron (Fe)Fe 96.8 to 98.1
Chromium (Cr)Cr 0.9 to 1.2
Manganese (Mn)Mn 0.6 to 0.9
Carbon (C)C 0.3 to 0.37
Molybdenum (Mo)Mo 0.15 to 0.3
Silicon (Si)Si 0 to 0.4
Phosphorus (P)P 0 to 0.035
Sulfur (S)S 0 to 0.035

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

Followup Questions

Further Reading

EN 10250-3: Open die steel forgings for general engineering purposes - Part 3: Alloy special steels

Welding Metallurgy, 2nd ed., Sindo Kou, 2003

EN 10263-4: Steel rod, bars and wire for cold heading and cold extrusion - Part 4: Technical delivery conditions for steels for quenching and tempering

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