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S15500 Stainless Steel vs. SAE-AISI 8645 Steel

Both S15500 stainless steel and SAE-AISI 8645 steel are iron alloys. They have 78% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S15500 stainless steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 290 to 430
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.8 to 16
12 to 23
Fatigue Strength, MPa 350 to 650
280 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 540 to 870
380 to 400
Tensile Strength: Ultimate (UTS), MPa 890 to 1490
600 to 670
Tensile Strength: Yield (Proof), MPa 590 to 1310
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 820
410
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
39
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 13
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.7
1.5
Embodied Energy, MJ/kg 39
20
Embodied Water, L/kg 130
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 890 to 4460
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 53
21 to 24
Strength to Weight: Bending, points 26 to 37
20 to 22
Thermal Diffusivity, mm2/s 4.6
10
Thermal Shock Resistance, points 30 to 50
18 to 20

Alloy Composition

Carbon (C), % 0 to 0.070
0.43 to 0.48
Chromium (Cr), % 14 to 15.5
0.4 to 0.6
Copper (Cu), % 2.5 to 4.5
0
Iron (Fe), % 71.9 to 79.9
96.5 to 97.7
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 3.5 to 5.5
0.4 to 0.7
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040