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SAE-AISI H21 Steel vs. N08925 Stainless Steel

Both SAE-AISI H21 steel and N08925 stainless steel are iron alloys. They have 51% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is N08925 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
80
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
680

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1630
1460
Melting Onset (Solidus), °C 1580
1410
Specific Heat Capacity, J/kg-K 440
460
Thermal Conductivity, W/m-K 27
13
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 23
33
Density, g/cm3 8.5
8.1
Embodied Carbon, kg CO2/kg material 4.5
6.2
Embodied Energy, MJ/kg 68
84
Embodied Water, L/kg 72
200

Common Calculations

PREN (Pitting Resistance) 19
44
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 23 to 58
23
Strength to Weight: Bending, points 21 to 38
21
Thermal Diffusivity, mm2/s 7.1
3.5
Thermal Shock Resistance, points 24 to 59
15

Alloy Composition

Carbon (C), % 0.28 to 0.36
0 to 0.020
Chromium (Cr), % 3.0 to 3.8
19 to 21
Copper (Cu), % 0 to 0.25
0.8 to 1.5
Iron (Fe), % 87.6 to 93.8
42.7 to 50.1
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 0
6.0 to 7.0
Nickel (Ni), % 0 to 0.3
24 to 26
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.15 to 0.5
0 to 0.5
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