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SAE-AISI H21 Steel vs. S32750 Stainless Steel

Both SAE-AISI H21 steel and S32750 stainless steel are iron alloys. They have 67% 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 S32750 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
860

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1630
1450
Melting Onset (Solidus), °C 1580
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Base Metal Price, % relative 23
21
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 4.5
4.1
Embodied Energy, MJ/kg 68
56
Embodied Water, L/kg 72
180

Common Calculations

PREN (Pitting Resistance) 19
43
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 23 to 58
31
Strength to Weight: Bending, points 21 to 38
26
Thermal Diffusivity, mm2/s 7.1
4.0
Thermal Shock Resistance, points 24 to 59
25

Alloy Composition

Carbon (C), % 0.28 to 0.36
0 to 0.030
Chromium (Cr), % 3.0 to 3.8
24 to 26
Copper (Cu), % 0 to 0.25
0 to 0.5
Iron (Fe), % 87.6 to 93.8
58.1 to 66.8
Manganese (Mn), % 0.15 to 0.4
0 to 1.2
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 0 to 0.3
6.0 to 8.0
Nitrogen (N), % 0
0.24 to 0.32
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.15 to 0.5
0 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
0