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Annealed AISI 420 vs. Annealed SAE-AISI T8

Both annealed AISI 420 and annealed SAE-AISI T8 are iron alloys. Both are furnished in the annealed condition. They have 78% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is annealed AISI 420 and the bottom bar is annealed SAE-AISI T8.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
240
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.29
Rockwell B Hardness 84
100
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 690
780

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1510
1730
Melting Onset (Solidus), °C 1450
1670
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 27
18
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
45
Density, g/cm3 7.7
9.0
Embodied Carbon, kg CO2/kg material 2.0
10
Embodied Energy, MJ/kg 28
160
Embodied Water, L/kg 100
120

Common Calculations

PREN (Pitting Resistance) 14
30
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 25
24
Strength to Weight: Bending, points 22
21
Thermal Diffusivity, mm2/s 7.3
4.8
Thermal Shock Resistance, points 25
24

Alloy Composition

Carbon (C), % 0.15 to 0.4
0.75 to 0.85
Chromium (Cr), % 12 to 14
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 82.3 to 87.9
69.3 to 75.4
Manganese (Mn), % 0 to 1.0
0.2 to 0.4
Molybdenum (Mo), % 0 to 0.5
0.4 to 1.0
Nickel (Ni), % 0 to 0.75
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4