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SAE-AISI 81B45 Steel vs. AISI 420F Stainless Steel

Both SAE-AISI 81B45 steel and AISI 420F stainless steel are iron alloys. They have 87% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 81B45 steel and the bottom bar is AISI 420F stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 200
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 24
18
Fatigue Strength, MPa 250 to 350
270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 340 to 400
460
Tensile Strength: Ultimate (UTS), MPa 540 to 670
740
Tensile Strength: Yield (Proof), MPa 350 to 560
430

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 410
760
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
3.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
7.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.0
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 49
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 320 to 840
480
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 24
27
Strength to Weight: Bending, points 19 to 22
23
Thermal Diffusivity, mm2/s 11
6.8
Thermal Shock Resistance, points 17 to 21
27

Alloy Composition

Boron (B), % 0.00050 to 0.0030
0
Carbon (C), % 0.43 to 0.48
0.3 to 0.4
Chromium (Cr), % 0.35 to 0.55
12 to 14
Iron (Fe), % 97 to 98
82.4 to 87.6
Manganese (Mn), % 0.75 to 1.0
0 to 1.3
Molybdenum (Mo), % 0.080 to 0.15
0 to 0.5
Nickel (Ni), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.035
0 to 0.060
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0.15 to 0.35