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Quenched and Tempered (+QT1) 1.7725 Cast Steel

EN 1.7725 +QT1 steel is EN 1.7725 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.7725 +QT1 steel to: cast 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

250

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

14 %

Fatigue Strength

390 MPa 57 x 103 psi

Impact Strength: V-Notched Charpy

34 J 25 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

830 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

610 MPa 88 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

440 °C 820 °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

39 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.9 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.8 kg CO2/kg material

Embodied Energy

24 MJ/kg 11 x 103 BTU/lb

Embodied Water

54 L/kg 6.5 gal/lb

Common Calculations

PREN (Pitting Resistance)

2.8

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

980 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

29 points

Strength to Weight: Bending

25 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

24 points

Alloy Composition

Iron (Fe) 95.7 to 97.5
Chromium (Cr) 1.3 to 1.7
Manganese (Mn) 0.6 to 1.0
Molybdenum (Mo) 0.3 to 0.5
Carbon (C) 0.27 to 0.34
Silicon (Si) 0 to 0.6
Vanadium (V) 0.050 to 0.15
Sulfur (S) 0 to 0.030
Phosphorus (P) 0 to 0.025

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

Followup Questions

Further Reading

EN 10293: Steel castings - Steel castings for general engineering uses

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