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Quenched and Tempered (+QT) 1.7241 Steel

EN 1.7241 +QT steel is EN 1.7241 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.7241 +QT 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

480

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

6.7 %

Fatigue Strength

850 MPa 120 x 103 psi

Impact Strength: U-Notched Charpy

9.0 J 6.6 ft-lb

Poisson's Ratio

0.29

Reduction in Area

34 %

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

940 MPa 140 x 103 psi

Tensile Strength: Ultimate (UTS)

1600 MPa 230 x 103 psi

Tensile Strength: Yield (Proof)

1460 MPa 210 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 790 °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

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 8.7 x 103 BTU/lb

Embodied Water

51 L/kg 6.0 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

100 MJ/m3

Resilience: Unit (Modulus of Resilience)

5650 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

57 points

Strength to Weight: Bending

39 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

47 points

Alloy Composition

Iron (Fe)Fe 96.6 to 97.8
Manganese (Mn)Mn 0.7 to 1.0
Chromium (Cr)Cr 0.7 to 1.0
Carbon (C)C 0.56 to 0.64
Molybdenum (Mo)Mo 0.25 to 0.35
Silicon (Si)Si 0 to 0.4
Phosphorus (P)P 0 to 0.025
Sulfur (S)S 0 to 0.025

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

Followup Questions

Further Reading

EN 10089: Hot rolled steels for quenched and tempered springs - Technical delivery conditions

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