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SAE-AISI A9 Steel vs. SAE-AISI T4 Steel

Both SAE-AISI A9 steel and SAE-AISI T4 steel are iron alloys. They have 77% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is SAE-AISI T4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
80
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
800 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1460
1810
Melting Onset (Solidus), °C 1410
1750
Specific Heat Capacity, J/kg-K 470
410
Thermal Conductivity, W/m-K 35
21
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
55
Density, g/cm3 7.8
9.4
Embodied Carbon, kg CO2/kg material 4.7
8.5
Embodied Energy, MJ/kg 70
130
Embodied Water, L/kg 82
120

Common Calculations

PREN (Pitting Resistance) 10
37
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 28 to 73
24 to 64
Strength to Weight: Bending, points 24 to 46
20 to 39
Thermal Diffusivity, mm2/s 9.6
5.4
Thermal Shock Resistance, points 25 to 66
24 to 64

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.7 to 0.8
Chromium (Cr), % 4.8 to 5.5
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
66.3 to 72.3
Manganese (Mn), % 0 to 0.5
0.1 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
0.4 to 1.0
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 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
17.5 to 19
Vanadium (V), % 0.8 to 1.4
0.8 to 1.2

Comparable Variants