AISI 420F (S42020) Stainless Steel
Martensitic Stainless Steels
Property Overview
Density7.7g/cm³
Elastic Modulus190GPa
Tensile Strength740MPa
Yield Strength430MPa
Brinell Hardness230HB
Maximum Service Temperature760°C
Chemical Composition
C
0.3 to 0.4%
CR
12 to 14%
MO
0 to 0.5%
MN
0 to 1.3%
SI
0 to 1.0%
P
0 to 0.060%
S
0.15 to 0.35%
FE
82.4 to 87.6%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
18 %
Fatigue Strength
270 MPa
Poisson's Ratio
0.28
Shear Modulus
76 GPa
Shear Strength
460 MPa
Tensile Strength: Ultimate (UTS)
740 MPa
Tensile Strength: Yield (Proof)
430 MPa
Hardness
Brinell Hardness
230
Physical
Density
7.7 g/cm 3
Thermal
Latent Heat of Fusion
270 J/g
Maximum Temperature: Corrosion
390 °C
Maximum Temperature: Mechanical
760 °C
Melting Completion (Liquidus)
1440 °C
Melting Onset (Solidus)
1390 °C
Specific Heat Capacity
480 J/kg-K
Thermal Conductivity
25 W/m-K
Thermal Diffusivity
6.8 mm 2 /s
Thermal Expansion
10 µm/m-K
Thermal Shock Resistance
27 points
Electrical
Electrical Conductivity: Equal Volume
3.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.7 % IACS
Calculated
PREN (Pitting Resistance)
14
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m 3
Resilience: Unit (Modulus of Resilience)
480 kJ/m 3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
27 points
Strength to Weight: Bending
23 points
Environmental
Base Metal Price
7.0 % relative
Embodied Carbon
2.0 kg CO 2 /kg material
Embodied Energy
28 MJ/kg
Embodied Energy
28 MJ/kg 12 x 10 3 BTU/lb
Embodied Water
100 L/kg
Embodied Water
100 L/kg 12 gal/lb
Registered Designations & Aliases
420FAISI 420FAISI 420F (S42020) Stainless SteelS42020
Standards
ASTM A895 ASTM A895: Standard Specification for Free-Machining Stainless Steel Plate, Sheet, and Strip
ASTM A895 ASTM A895: Standard Specification for Free-Machining Stainless Steel Plate, Sheet, and Strip Creep-Resistant Steels, Fujio Abe et al. (editors), 2008 Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005 Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012 Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993 Corrosion of Stainless Steels, A. John Sedriks, 1996