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SAE-AISI 81B45 Steel vs. ASTM A285 Carbon Steel

Both SAE-AISI 81B45 steel and ASTM A285 carbon steel are iron alloys.

For each property being compared, the top bar is SAE-AISI 81B45 steel and the bottom bar is ASTM A285 carbon steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 200
110 to 130
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 24
30 to 34
Fatigue Strength, MPa 250 to 350
150 to 180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 340 to 400
250 to 290
Tensile Strength: Ultimate (UTS), MPa 540 to 670
380 to 450
Tensile Strength: Yield (Proof), MPa 350 to 560
190 to 230

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420 to 1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
53
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
1.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
18
Embodied Water, L/kg 49
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 110
110
Resilience: Unit (Modulus of Resilience), kJ/m3 320 to 840
94 to 150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 24
13 to 16
Strength to Weight: Bending, points 19 to 22
15 to 17
Thermal Diffusivity, mm2/s 11
14
Thermal Shock Resistance, points 17 to 21
12 to 14