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Quenched and Tempered (+QT750) 1.4122 Stainless Steel

EN 1.4122 +QT750 steel is EN 1.4122 stainless steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.4122 +QT750 steel to: wrought martensitic stainless 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

200 GPa 29 x 106 psi

Elongation at Break

14 %

Fatigue Strength

360 MPa 52 x 103 psi

Impact Strength: V-Notched Charpy

11 J 8.3 ft-lb

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Shear Strength

520 MPa 75 x 103 psi

Tensile Strength: Ultimate (UTS)

850 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

630 MPa 91 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

400 °C 750 °F

Maximum Temperature: Mechanical

870 °C 1590 °F

Melting Completion (Liquidus)

1440 °C 2630 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.7 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

2.4 kg CO2/kg material

Embodied Energy

33 MJ/kg 14 x 103 BTU/lb

Embodied Water

120 L/kg 14 gal/lb

Common Calculations

PREN (Pitting Resistance)

20

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

1000 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

31 points

Strength to Weight: Bending

26 points

Thermal Diffusivity

4.0 mm2/s

Thermal Shock Resistance

30 points

Alloy Composition

Iron (Fe)Fe 77.2 to 83.4
Chromium (Cr)Cr 15.5 to 17.5
Molybdenum (Mo)Mo 0.8 to 1.3
Manganese (Mn)Mn 0 to 1.5
Silicon (Si)Si 0 to 1.0
Nickel (Ni)Ni 0 to 1.0
Carbon (C)C 0.33 to 0.45
Phosphorus (P)P 0 to 0.040
Sulfur (S)S 0 to 0.015

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

Followup Questions

Further Reading

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

EN 10088-3: Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

EN 10088-1: Stainless steels - Part 1: List of stainless steels

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010