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SAE-AISI 8645 Steel vs. AISI 204 Stainless Steel

Both SAE-AISI 8645 steel and AISI 204 stainless steel are iron alloys. They have 75% 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 8645 steel and the bottom bar is AISI 204 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
210 to 330
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
23 to 39
Fatigue Strength, MPa 280 to 350
320 to 720
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 380 to 400
500 to 700
Tensile Strength: Ultimate (UTS), MPa 600 to 670
730 to 1100
Tensile Strength: Yield (Proof), MPa 390 to 560
380 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 410
850
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
10
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.4
Embodied Energy, MJ/kg 20
35
Embodied Water, L/kg 50
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
240 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
360 to 2940
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
27 to 40
Strength to Weight: Bending, points 20 to 22
24 to 31
Thermal Diffusivity, mm2/s 10
4.1
Thermal Shock Resistance, points 18 to 20
16 to 24

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.030
Chromium (Cr), % 0.4 to 0.6
15 to 17
Iron (Fe), % 96.5 to 97.7
69.6 to 76.4
Manganese (Mn), % 0.75 to 1.0
7.0 to 9.0
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
1.5 to 3.0
Nitrogen (N), % 0
0.15 to 0.3
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