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Annealed SAE-AISI A9 vs. Annealed SAE-AISI M34

Both annealed SAE-AISI A9 and annealed SAE-AISI M34 are iron alloys. Both are furnished in the annealed condition. They have 82% 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 M34.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
240
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
800

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1410
1500
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 35
24
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
32
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 4.7
9.5
Embodied Energy, MJ/kg 70
140
Embodied Water, L/kg 82
150

Common Calculations

PREN (Pitting Resistance) 10
35
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28
27
Strength to Weight: Bending, points 24
23
Thermal Diffusivity, mm2/s 9.6
6.7
Thermal Shock Resistance, points 25
25

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.85 to 0.92
Chromium (Cr), % 4.8 to 5.5
3.5 to 4.0
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
71.3 to 76.5
Manganese (Mn), % 0 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
7.8 to 9.2
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
1.4 to 2.1
Vanadium (V), % 0.8 to 1.4
1.9 to 2.3