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SAE-AISI 8645 Steel vs. S17700 Stainless Steel

Both SAE-AISI 8645 steel and S17700 stainless steel are iron alloys. They have 76% 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 S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
180 to 430
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
1.0 to 23
Fatigue Strength, MPa 280 to 350
290 to 560
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 380 to 400
740 to 940
Tensile Strength: Ultimate (UTS), MPa 600 to 670
1180 to 1650
Tensile Strength: Yield (Proof), MPa 390 to 560
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
890
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
13
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.8
Embodied Energy, MJ/kg 20
40
Embodied Water, L/kg 50
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
460 to 3750
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
42 to 59
Strength to Weight: Bending, points 20 to 22
32 to 40
Thermal Diffusivity, mm2/s 10
4.1
Thermal Shock Resistance, points 18 to 20
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0.43 to 0.48
0 to 0.090
Chromium (Cr), % 0.4 to 0.6
16 to 18
Iron (Fe), % 96.5 to 97.7
70.5 to 76.8
Manganese (Mn), % 0.75 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
6.5 to 7.8
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030

Comparable Variants