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Annealed SAE-AISI A9 vs. Annealed SAE-AISI M3 Class 1

Both annealed SAE-AISI A9 and annealed SAE-AISI M3 class 1 are iron alloys. Both are furnished in the annealed condition. They have 88% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI A9 and the bottom bar is annealed SAE-AISI M3 class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
77
Tensile Strength: Ultimate (UTS), MPa 770
770

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1460
1610
Melting Onset (Solidus), °C 1410
1570
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 35
26
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
25
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 4.7
10
Embodied Energy, MJ/kg 70
150
Embodied Water, L/kg 82
100

Common Calculations

PREN (Pitting Resistance) 10
33
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 28
26
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 9.6
7.2
Thermal Shock Resistance, points 25
24

Alloy Composition

Carbon (C), % 0.45 to 0.55
1.0 to 1.1
Chromium (Cr), % 4.8 to 5.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
76.9 to 82.9
Manganese (Mn), % 0 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
4.8 to 6.5
Nickel (Ni), % 1.3 to 1.8
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 1.0 to 1.2
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
5.0 to 6.8
Vanadium (V), % 0.8 to 1.4
2.3 to 2.8