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AISI 321H Stainless Steel vs. SAE-AISI T8 Steel

Both AISI 321H stainless steel and SAE-AISI T8 steel are iron alloys. They have 75% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is AISI 321H stainless steel and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 580
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1430
1730
Melting Onset (Solidus), °C 1380
1670
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 15
18
Thermal Expansion, µm/m-K 17
12

Otherwise Unclassified Properties

Base Metal Price, % relative 16
45
Density, g/cm3 7.8
9.0
Embodied Carbon, kg CO2/kg material 3.2
10
Embodied Energy, MJ/kg 46
160
Embodied Water, L/kg 140
120

Common Calculations

PREN (Pitting Resistance) 18
30
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 21
24 to 66
Strength to Weight: Bending, points 20
21 to 41
Thermal Diffusivity, mm2/s 4.0
4.8
Thermal Shock Resistance, points 12
24 to 66

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.75 to 0.85
Chromium (Cr), % 17 to 19
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 65.4 to 74
69.3 to 75.4
Manganese (Mn), % 0 to 2.0
0.2 to 0.4
Molybdenum (Mo), % 0
0.4 to 1.0
Nickel (Ni), % 9.0 to 12
0 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 0.75
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0 to 0.7
0
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4