AISI 420F (1.4028, 1.4031, S42020) Stainless Steel
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AISI 420F stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. 420F is the AISI designation for this material. 1.4028 is the EN numeric designation. S42020 is the UNS number. Additionally, the EN chemical designation is X30Cr13.
The properties of AISI 420F stainless steel include two common variations. The property values on this page show ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare AISI 420F stainless steel to: wrought martensitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). The length of each bar shows the given value as a % of the largest value in the relevant set.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
11 to 15 %
Fatigue Strength
230 to 370 MPa 33 to 54 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Shear Strength
390 to 540 MPa 57 to 78 x 103 psi
Tensile Strength: Ultimate (UTS)
650 to 900 MPa 94 to 130 x 103 psi
Tensile Strength: Yield (Proof)
390 to 680 MPa 56 to 99 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Melting Completion (Liquidus)
1440 °C 2620 °F
Melting Onset (Solidus)
1400 °C 2540 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
29 W/m-K 17 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
3.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
7.3 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
2.0 kg CO2/kg material
Embodied Energy
28 MJ/kg 12 x 103 BTU/lb
Embodied Water
100 L/kg 12 gal/lb
Common Calculations
PREN (Pitting Resistance)
14
Resilience: Ultimate (Unit Rupture Work)
84 to 94 MJ/m3
Resilience: Unit (Modulus of Resilience)
380 to 1200 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
23 to 32 points
Strength to Weight: Bending
21 to 27 points
Thermal Diffusivity
7.8 m2/s
Thermal Shock Resistance
23 to 32 points
Alloy Composition
| Fe | 82.4 to 87.7 | |
| Cr | 12 to 14.5 | |
| Mn | 0 to 1.5 | |
| Si | 0 to 1.0 | |
| C | 0.26 to 0.42 | |
| Mo | 0 to 0.5 | |
| S | 0 to 0.35 | |
| P | 0 to 0.060 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10088-2: Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
Advances in Stainless Steels, Raj et al. (editors), 2010
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
Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993