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Quenched and Tempered (+QT) 1.7767 Steel

EN 1.7767 +QT steel is EN 1.7767 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.7767 +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

200

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

20 %

Fatigue Strength

320 MPa 47 x 103 psi

Impact Strength: V-Notched Charpy

46 J 34 ft-lb

Poisson's Ratio

0.29

Shear Modulus

74 GPa 11 x 106 psi

Shear Strength

420 MPa 61 x 103 psi

Tensile Strength: Ultimate (UTS)

670 MPa 97 x 103 psi

Tensile Strength: Yield (Proof)

460 MPa 67 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

480 °C 890 °F

Melting Completion (Liquidus)

1470 °C 2680 °F

Melting Onset (Solidus)

1430 °C 2600 °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

7.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.5 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

2.4 kg CO2/kg material

Embodied Energy

33 MJ/kg 14 x 103 BTU/lb

Embodied Water

64 L/kg 7.6 gal/lb

Common Calculations

PREN (Pitting Resistance)

6.4

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

570 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Iron (Fe)Fe 93.8 to 95.8
Chromium (Cr)Cr 2.8 to 3.3
Molybdenum (Mo)Mo 0.9 to 1.1
Manganese (Mn)Mn 0.3 to 0.6
Vanadium (V)V 0.2 to 0.3
Carbon (C)C 0.1 to 0.15
Nickel (Ni)Ni 0 to 0.25
Copper (Cu)Cu 0 to 0.25
Silicon (Si)Si 0 to 0.15
Niobium (Nb)Nb 0 to 0.070
Titanium (Ti)Ti 0 to 0.030
Phosphorus (P)P 0 to 0.015
Nitrogen (N)N 0 to 0.012
Sulfur (S)S 0 to 0.0050

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

Followup Questions

Further Reading

EN 10028-2: Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties

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

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

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