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SAE-AISI 81B45 Steel vs. S35315 Stainless Steel

Both SAE-AISI 81B45 steel and S35315 stainless steel are iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 81B45 steel and the bottom bar is S35315 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 200
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 24
46
Fatigue Strength, MPa 250 to 350
280
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 340 to 400
520
Tensile Strength: Ultimate (UTS), MPa 540 to 670
740
Tensile Strength: Yield (Proof), MPa 350 to 560
300

Thermal Properties

Latent Heat of Fusion, J/g 250
330
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1370
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
12
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
34
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
5.7
Embodied Energy, MJ/kg 20
81
Embodied Water, L/kg 49
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 110
270
Resilience: Unit (Modulus of Resilience), kJ/m3 320 to 840
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 24
26
Strength to Weight: Bending, points 19 to 22
23
Thermal Diffusivity, mm2/s 11
3.1
Thermal Shock Resistance, points 17 to 21
17

Alloy Composition

Boron (B), % 0.00050 to 0.0030
0
Carbon (C), % 0.43 to 0.48
0.040 to 0.080
Cerium (Ce), % 0
0.030 to 0.1
Chromium (Cr), % 0.35 to 0.55
24 to 26
Iron (Fe), % 97 to 98
33.6 to 40.6
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.080 to 0.15
0
Nickel (Ni), % 0.2 to 0.4
34 to 36
Nitrogen (N), % 0
0.12 to 0.18
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
1.2 to 2.0
Sulfur (S), % 0 to 0.040
0 to 0.030