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SAE-AISI 1345 Steel vs. SAE-AISI 8640 Steel

Both SAE-AISI 1345 steel and SAE-AISI 8640 steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 1345 steel and the bottom bar is SAE-AISI 8640 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 23
23
Fatigue Strength, MPa 230 to 390
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 370 to 440
360
Tensile Strength: Ultimate (UTS), MPa 590 to 730
570
Tensile Strength: Yield (Proof), MPa 330 to 620
380

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
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 48
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 290 to 1040
380
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 26
20
Strength to Weight: Bending, points 20 to 23
20
Thermal Diffusivity, mm2/s 14
10
Thermal Shock Resistance, points 19 to 23
17

Alloy Composition

Carbon (C), % 0.43 to 0.48
0.38 to 0.43
Chromium (Cr), % 0
0.4 to 0.6
Iron (Fe), % 97.2 to 97.8
96.6 to 97.8
Manganese (Mn), % 1.6 to 1.9
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 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040