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SAE-AISI 8645 Steel vs. S44725 Stainless Steel

Both SAE-AISI 8645 steel and S44725 stainless steel are iron alloys. They have 72% of their average alloy composition in common. 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 8645 steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
22
Fatigue Strength, MPa 280 to 350
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
81
Shear Strength, MPa 380 to 400
320
Tensile Strength: Ultimate (UTS), MPa 600 to 670
500
Tensile Strength: Yield (Proof), MPa 390 to 560
310

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
3.1
Embodied Energy, MJ/kg 20
44
Embodied Water, L/kg 50
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
99
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
240
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
18
Strength to Weight: Bending, points 20 to 22
18
Thermal Diffusivity, mm2/s 10
4.6
Thermal Shock Resistance, points 18 to 20
16

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.015
Chromium (Cr), % 0.4 to 0.6
25 to 28.5
Iron (Fe), % 96.5 to 97.7
67.6 to 73.5
Manganese (Mn), % 0.75 to 1.0
0 to 0.4
Molybdenum (Mo), % 0.15 to 0.25
1.5 to 2.5
Nickel (Ni), % 0.4 to 0.7
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.040
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0 to 0.26