Quenched and Tempered (+QT750) 1.4021 Stainless Steel
EN 1.4021 +QT750 steel is EN 1.4021 stainless steel in the quenched and tempered condition. It has the second highest strength and lowest ductility compared to the other variants of EN 1.4021 stainless steel.
The graph bars on the material properties cards below compare EN 1.4021 +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
190 GPa 28 x 106 psi
Elongation at Break
11 %
Fatigue Strength
340 MPa 50 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Shear Strength
510 MPa 74 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
270 J/g
Maximum Temperature: Corrosion
390 °C 730 °F
Maximum Temperature: Mechanical
760 °C 1390 °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
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
7.0 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
1.9 kg CO2/kg material
Embodied Energy
27 MJ/kg 12 x 103 BTU/lb
Embodied Water
100 L/kg 12 gal/lb
Common Calculations
PREN (Pitting Resistance)
13
Resilience: Ultimate (Unit Rupture Work)
88 MJ/m3
Resilience: Unit (Modulus of Resilience)
1010 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
8.1 mm2/s
Thermal Shock Resistance
30 points
Alloy Composition
| Fe | 83.2 to 87.8 | |
| Cr | 12 to 14 | |
| Mn | 0 to 1.5 | |
| Si | 0 to 1.0 | |
| C | 0.16 to 0.25 | |
| P | 0 to 0.040 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 10250-4: Open die steel forgings for general engineering purposes - Part 4: Stainless steels
EN 10088-2: Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
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