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SAE-AISI 8645 Steel vs. ASTM A283 Carbon Steel

Both SAE-AISI 8645 steel and ASTM A283 carbon steel are iron alloys.

For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is ASTM A283 carbon steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
110 to 140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 23
26 to 34
Fatigue Strength, MPa 280 to 350
150 to 190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 380 to 400
240 to 310
Tensile Strength: Ultimate (UTS), MPa 600 to 670
360 to 480
Tensile Strength: Yield (Proof), MPa 390 to 560
180 to 260

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
51 to 53
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
1.8
Density, g/cm3 7.8
7.8 to 7.9
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
18
Embodied Water, L/kg 50
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
100 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
91 to 180
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 24
13 to 17
Strength to Weight: Bending, points 20 to 22
14 to 17
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 18 to 20
11 to 15