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ASTM Grade HC Steel vs. SAE-AISI H21 Steel

Both ASTM grade HC steel and SAE-AISI H21 steel are iron alloys. They have 72% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
76
Tensile Strength: Ultimate (UTS), MPa 430
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1410
1630
Melting Onset (Solidus), °C 1370
1580
Specific Heat Capacity, J/kg-K 490
440
Thermal Conductivity, W/m-K 17
27
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Base Metal Price, % relative 14
23
Density, g/cm3 7.6
8.5
Embodied Carbon, kg CO2/kg material 2.8
4.5
Embodied Energy, MJ/kg 40
68
Embodied Water, L/kg 170
72

Common Calculations

PREN (Pitting Resistance) 29
19
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 26
23
Strength to Weight: Axial, points 16
23 to 58
Strength to Weight: Bending, points 16
21 to 38
Thermal Diffusivity, mm2/s 4.5
7.1
Thermal Shock Resistance, points 14
24 to 59

Alloy Composition

Carbon (C), % 0 to 0.5
0.28 to 0.36
Chromium (Cr), % 26 to 30
3.0 to 3.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 61.9 to 74
87.6 to 93.8
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 2.0
0.15 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
8.5 to 10
Vanadium (V), % 0
0.3 to 0.6