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AISI 420 Stainless Steel vs. S43940 Stainless Steel

Both AISI 420 stainless steel and S43940 stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is AISI 420 stainless steel and the bottom bar is S43940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 8.0 to 15
21
Fatigue Strength, MPa 220 to 670
180
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 84
76
Shear Modulus, GPa 76
77
Shear Strength, MPa 420 to 1010
310
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
490
Tensile Strength: Yield (Proof), MPa 380 to 1310
280

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 390
540
Maximum Temperature: Mechanical, °C 620
890
Melting Completion (Liquidus), °C 1510
1440
Melting Onset (Solidus), °C 1450
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
25
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
12
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.6
Embodied Energy, MJ/kg 28
38
Embodied Water, L/kg 100
120

Common Calculations

PREN (Pitting Resistance) 14
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
86
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
200
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 62
18
Strength to Weight: Bending, points 22 to 41
18
Thermal Diffusivity, mm2/s 7.3
6.8
Thermal Shock Resistance, points 25 to 62
18

Alloy Composition

Carbon (C), % 0.15 to 0.4
0 to 0.030
Chromium (Cr), % 12 to 14
17.5 to 18.5
Iron (Fe), % 82.3 to 87.9
78.2 to 82.1
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 0.75
0
Niobium (Nb), % 0
0.3 to 0.6
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6