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SAE-AISI H21 Steel vs. S15500 Stainless Steel

Both SAE-AISI H21 steel and S15500 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
890 to 1490

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Melting Completion (Liquidus), °C 1630
1430
Melting Onset (Solidus), °C 1580
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 27
17
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Base Metal Price, % relative 23
13
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 4.5
2.7
Embodied Energy, MJ/kg 68
39
Embodied Water, L/kg 72
130

Common Calculations

PREN (Pitting Resistance) 19
15
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 23 to 58
32 to 53
Strength to Weight: Bending, points 21 to 38
26 to 37
Thermal Diffusivity, mm2/s 7.1
4.6
Thermal Shock Resistance, points 24 to 59
30 to 50

Alloy Composition

Carbon (C), % 0.28 to 0.36
0 to 0.070
Chromium (Cr), % 3.0 to 3.8
14 to 15.5
Copper (Cu), % 0 to 0.25
2.5 to 4.5
Iron (Fe), % 87.6 to 93.8
71.9 to 79.9
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Nickel (Ni), % 0 to 0.3
3.5 to 5.5
Niobium (Nb), % 0
0.15 to 0.45
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 0.5
0 to 1.0
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