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Annealed SAE-AISI A9 vs. Annealed SAE-AISI M6

Both annealed SAE-AISI A9 and annealed SAE-AISI M6 are iron alloys. Both are furnished in the annealed condition. They have 80% of their average alloy composition in common. There are 23 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 annealed SAE-AISI A9 and the bottom bar is annealed SAE-AISI M6.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
250
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
840

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1460
1560
Melting Onset (Solidus), °C 1410
1510
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 35
17
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
39
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 4.7
8.0
Embodied Energy, MJ/kg 70
120
Embodied Water, L/kg 82
160

Common Calculations

PREN (Pitting Resistance) 10
28
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 28
28
Strength to Weight: Bending, points 24
24
Thermal Diffusivity, mm2/s 9.6
4.7
Thermal Shock Resistance, points 25
26

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.75 to 0.85
Chromium (Cr), % 4.8 to 5.5
3.8 to 4.5
Cobalt (Co), % 0
11 to 13
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
68.8 to 74.6
Manganese (Mn), % 0 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
4.5 to 5.5
Nickel (Ni), % 1.3 to 1.8
0
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
3.8 to 4.8
Vanadium (V), % 0.8 to 1.4
1.3 to 1.7