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Quenched and Tempered (+QT) 1.6580 Steel

EN 1.6580 +QT steel is EN 1.6580 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.6580 +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

350

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

11 %

Fatigue Strength

610 MPa 89 x 103 psi

Impact Strength: V-Notched Charpy

37 J 27 ft-lb

Poisson's Ratio

0.29

Reduction in Area

45 %

Rockwell C Hardness

52

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

700 MPa 100 x 103 psi

Tensile Strength: Ultimate (UTS)

1170 MPa 170 x 103 psi

Tensile Strength: Yield (Proof)

990 MPa 140 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

450 °C 850 °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

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.3 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.8 kg CO2/kg material

Embodied Energy

23 MJ/kg 10 x 103 BTU/lb

Embodied Water

59 L/kg 7.0 gal/lb

Common Calculations

PREN (Pitting Resistance)

3.3

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

2590 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

41 points

Strength to Weight: Bending

31 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

34 points

Alloy Composition

Iron (Fe)Fe 93.7 to 95.5
Nickel (Ni)Ni 1.8 to 2.2
Chromium (Cr)Cr 1.8 to 2.2
Manganese (Mn)Mn 0.3 to 0.6
Molybdenum (Mo)Mo 0.3 to 0.5
Carbon (C)C 0.26 to 0.34
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 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

EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or 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