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SAE-AISI H21 Steel vs. SAE-AISI S1 Steel

Both SAE-AISI H21 steel and SAE-AISI S1 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is SAE-AISI S1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
690 to 1840

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1630
1500
Melting Onset (Solidus), °C 1580
1450
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 27
41
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Base Metal Price, % relative 23
8.0
Density, g/cm3 8.5
8.0
Embodied Carbon, kg CO2/kg material 4.5
2.6
Embodied Energy, MJ/kg 68
37
Embodied Water, L/kg 72
56

Common Calculations

PREN (Pitting Resistance) 19
5.9
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 23 to 58
24 to 64
Strength to Weight: Bending, points 21 to 38
22 to 42
Thermal Diffusivity, mm2/s 7.1
11
Thermal Shock Resistance, points 24 to 59
21 to 56

Alloy Composition

Carbon (C), % 0.28 to 0.36
0.4 to 0.55
Chromium (Cr), % 3.0 to 3.8
1.0 to 1.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87.6 to 93.8
91.6 to 96.7
Manganese (Mn), % 0.15 to 0.4
0.1 to 0.4
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.5
0.15 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 8.5 to 10
1.5 to 3.0
Vanadium (V), % 0.3 to 0.6
0.15 to 0.3

Comparable Variants