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

Both SAE-AISI 1070 steel and SAE-AISI 8645 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 1070 steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
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 50
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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