Quenched and Tempered (+QT) 1.4938 Stainless Steel
EN 1.4938 +QT steel is EN 1.4938 stainless steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.4938 +QT 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 28 x 106 psi
Elongation at Break
16 %
Fatigue Strength
520 MPa 75 x 103 psi
Impact Strength: V-Notched Charpy
46 J 34 ft-lb
Poisson's Ratio
0.28
Reduction in Area
45 %
Shear Modulus
76 GPa 11 x 106 psi
Shear Strength
630 MPa 92 x 103 psi
Tensile Strength: Ultimate (UTS)
1030 MPa 150 x 103 psi
Tensile Strength: Yield (Proof)
870 MPa 130 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Maximum Temperature: Corrosion
390 °C 730 °F
Maximum Temperature: Mechanical
750 °C 1380 °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
30 W/m-K 17 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
3.3 kg CO2/kg material
Embodied Energy
47 MJ/kg 20 x 103 BTU/lb
Embodied Water
110 L/kg 13 gal/lb
Common Calculations
PREN (Pitting Resistance)
18
Resilience: Ultimate (Unit Rupture Work)
160 MJ/m3
Resilience: Unit (Modulus of Resilience)
1920 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
37 points
Strength to Weight: Bending
29 points
Thermal Diffusivity
8.1 mm2/s
Thermal Shock Resistance
35 points
Alloy Composition
| Fe | 80.5 to 84.8 | |
| Cr | 11 to 12.5 | |
| Ni | 2.0 to 3.0 | |
| Mo | 1.5 to 2.0 | |
| Mn | 0.4 to 0.9 | |
| V | 0.25 to 0.4 | |
| Si | 0 to 0.5 | |
| C | 0.080 to 0.15 | |
| N | 0.020 to 0.040 | |
| P | 0 to 0.025 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 10302: Creep resisting steels, nickel and cobalt alloys
EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016
Creep-Resistant Steels, Fujio Abe et al. (editors), 2008
EN 10088-1: Stainless steels - Part 1: List of stainless steels
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010