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ASTM Grade HK Steel vs. SAE-AISI H21 Steel

Both ASTM grade HK steel and SAE-AISI H21 steel are iron alloys. They have 56% 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 ASTM grade HK 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 79
76
Tensile Strength: Ultimate (UTS), MPa 500
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1400
1630
Melting Onset (Solidus), °C 1350
1580
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 15
27
Thermal Expansion, µm/m-K 17
11

Otherwise Unclassified Properties

Base Metal Price, % relative 25
23
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.4
4.5
Embodied Energy, MJ/kg 63
68
Embodied Water, L/kg 200
72

Common Calculations

PREN (Pitting Resistance) 27
19
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 18
23 to 58
Strength to Weight: Bending, points 18
21 to 38
Thermal Diffusivity, mm2/s 3.9
7.1
Thermal Shock Resistance, points 11
24 to 59

Alloy Composition

Carbon (C), % 0.2 to 0.6
0.28 to 0.36
Chromium (Cr), % 24 to 28
3.0 to 3.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 44.8 to 57.8
87.6 to 93.8
Manganese (Mn), % 0 to 2.0
0.15 to 0.4
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 18 to 22
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