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SAE-AISI H21 Steel vs. S42300 Stainless Steel

Both SAE-AISI H21 steel and S42300 stainless steel are iron alloys. They have 88% 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 SAE-AISI H21 steel and the bottom bar is S42300 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
77
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
1100

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1630
1470
Melting Onset (Solidus), °C 1580
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 27
25
Thermal Expansion, µm/m-K 11
10

Otherwise Unclassified Properties

Base Metal Price, % relative 23
9.5
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 4.5
3.2
Embodied Energy, MJ/kg 68
44
Embodied Water, L/kg 72
110

Common Calculations

PREN (Pitting Resistance) 19
21
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 23 to 58
39
Strength to Weight: Bending, points 21 to 38
30
Thermal Diffusivity, mm2/s 7.1
6.8
Thermal Shock Resistance, points 24 to 59
40

Alloy Composition

Carbon (C), % 0.28 to 0.36
0.27 to 0.32
Chromium (Cr), % 3.0 to 3.8
11 to 12
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
82 to 85.1
Manganese (Mn), % 0.15 to 0.4
1.0 to 1.4
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 0 to 0.3
0 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.15 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
0.2 to 0.3