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SAE-AISI 8645 Steel vs. AWS E309H

Both SAE-AISI 8645 steel and AWS E309H are iron alloys. They have 63% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is AWS E309H.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
34
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 600 to 670
620

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
15
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
20
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.7
Embodied Energy, MJ/kg 20
52
Embodied Water, L/kg 50
180

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
22
Strength to Weight: Bending, points 20 to 22
21
Thermal Diffusivity, mm2/s 10
4.0
Thermal Shock Resistance, points 18 to 20
16

Alloy Composition

Carbon (C), % 0.43 to 0.48
0.040 to 0.15
Chromium (Cr), % 0.4 to 0.6
22 to 25
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 96.5 to 97.7
55.8 to 65.5
Manganese (Mn), % 0.75 to 1.0
0.5 to 2.5
Molybdenum (Mo), % 0.15 to 0.25
0 to 0.75
Nickel (Ni), % 0.4 to 0.7
12 to 14
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030