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SAE-AISI 8645 Steel vs. SAE-AISI 1070 Steel

Both SAE-AISI 8645 steel and SAE-AISI 1070 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is SAE-AISI 1070 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
190 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 23
10 to 13
Fatigue Strength, MPa 280 to 350
270 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 380 to 400
380 to 460
Tensile Strength: Ultimate (UTS), MPa 600 to 670
640 to 760
Tensile Strength: Yield (Proof), MPa 390 to 560
420 to 560

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
50
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
19
Embodied Water, L/kg 50
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
59 to 86
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
470 to 850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 24
23 to 27
Strength to Weight: Bending, points 20 to 22
21 to 24
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 18 to 20
21 to 25

Alloy Composition

Carbon (C), % 0.43 to 0.48
0.65 to 0.75
Chromium (Cr), % 0.4 to 0.6
0
Iron (Fe), % 96.5 to 97.7
98.3 to 98.8
Manganese (Mn), % 0.75 to 1.0
0.6 to 0.9
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0 to 0.050