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S20431 Stainless Steel vs. AISI 420 Stainless Steel

Both S20431 stainless steel and AISI 420 stainless steel are iron alloys. They have 85% of their average alloy composition in common.

For each property being compared, the top bar is S20431 stainless steel and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 46
8.0 to 15
Fatigue Strength, MPa 320
220 to 670
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 86
84
Shear Modulus, GPa 76
76
Shear Strength, MPa 500
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 710
690 to 1720
Tensile Strength: Yield (Proof), MPa 350
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 410
390
Maximum Temperature: Mechanical, °C 890
620
Melting Completion (Liquidus), °C 1400
1510
Melting Onset (Solidus), °C 1360
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
27
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
7.5
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.5
2.0
Embodied Energy, MJ/kg 36
28
Embodied Water, L/kg 140
100

Common Calculations

PREN (Pitting Resistance) 20
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 310
380 to 4410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
25 to 62
Strength to Weight: Bending, points 23
22 to 41
Thermal Diffusivity, mm2/s 4.0
7.3
Thermal Shock Resistance, points 15
25 to 62

Alloy Composition

Carbon (C), % 0 to 0.12
0.15 to 0.4
Chromium (Cr), % 17 to 18
12 to 14
Copper (Cu), % 1.5 to 3.5
0
Iron (Fe), % 66.1 to 74.4
82.3 to 87.9
Manganese (Mn), % 5.0 to 7.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 2.0 to 4.0
0 to 0.75
Nitrogen (N), % 0.1 to 0.25
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030