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SAE-AISI T8 Steel vs. S17700 Stainless Steel

Both SAE-AISI T8 steel and S17700 stainless 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 (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T8 steel and the bottom bar is S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
76
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
1180 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1730
1440
Melting Onset (Solidus), °C 1670
1400
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 18
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 45
13
Density, g/cm3 9.0
7.7
Embodied Carbon, kg CO2/kg material 10
2.8
Embodied Energy, MJ/kg 160
40
Embodied Water, L/kg 120
150

Common Calculations

PREN (Pitting Resistance) 30
17
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
42 to 59
Strength to Weight: Bending, points 21 to 41
32 to 40
Thermal Diffusivity, mm2/s 4.8
4.1
Thermal Shock Resistance, points 24 to 66
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0.75 to 0.85
0 to 0.090
Chromium (Cr), % 3.8 to 4.5
16 to 18
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
70.5 to 76.8
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
6.5 to 7.8
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0

Comparable Variants