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SAE-AISI T4 Steel vs. SAE-AISI A4 Steel

Both SAE-AISI T4 steel and SAE-AISI A4 steel are iron alloys. They have 73% 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 T4 steel and the bottom bar is SAE-AISI A4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
73
Tensile Strength: Ultimate (UTS), MPa 800 to 2140
710 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1810
1450
Melting Onset (Solidus), °C 1750
1410
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 21
40
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 55
3.9
Density, g/cm3 9.4
7.8
Embodied Carbon, kg CO2/kg material 8.5
1.8
Embodied Energy, MJ/kg 130
24
Embodied Water, L/kg 120
59

Common Calculations

PREN (Pitting Resistance) 37
5.3
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 24 to 64
25 to 73
Strength to Weight: Bending, points 20 to 39
23 to 46
Thermal Diffusivity, mm2/s 5.4
11
Thermal Shock Resistance, points 24 to 64
23 to 67

Alloy Composition

Carbon (C), % 0.7 to 0.8
1.0 to 1.1
Chromium (Cr), % 3.8 to 4.5
0.9 to 2.2
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 66.3 to 72.3
92 to 95.5
Manganese (Mn), % 0.1 to 0.4
1.8 to 2.2
Molybdenum (Mo), % 0.4 to 1.0
0.9 to 1.4
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 17.5 to 19
0
Vanadium (V), % 0.8 to 1.2
0

Comparable Variants