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SAE-AISI H21 Steel vs. S38100 Stainless Steel

Both SAE-AISI H21 steel and S38100 stainless steel are iron alloys. They have 65% 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 H21 steel and the bottom bar is S38100 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 76
76
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
580

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1630
1400
Melting Onset (Solidus), °C 1580
1350
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 23
20
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 4.5
3.8
Embodied Energy, MJ/kg 68
54
Embodied Water, L/kg 72
160

Common Calculations

PREN (Pitting Resistance) 19
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 23 to 58
21
Strength to Weight: Bending, points 21 to 38
20
Thermal Diffusivity, mm2/s 7.1
4.0
Thermal Shock Resistance, points 24 to 59
13

Alloy Composition

Carbon (C), % 0.28 to 0.36
0 to 0.080
Chromium (Cr), % 3.0 to 3.8
17 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
57.9 to 64
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Nickel (Ni), % 0 to 0.3
17.5 to 18.5
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.5
1.5 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
0