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SAE-AISI D7 Steel vs. SAE-AISI H21 Steel

Both SAE-AISI D7 steel and SAE-AISI H21 steel are iron alloys. They have 84% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI D7 steel and the bottom bar is SAE-AISI H21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1440
1630
Melting Onset (Solidus), °C 1400
1580
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 27
27
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
23
Density, g/cm3 7.6
8.5
Embodied Carbon, kg CO2/kg material 11
4.5
Embodied Energy, MJ/kg 180
68
Embodied Water, L/kg 130
72

Common Calculations

PREN (Pitting Resistance) 16
19
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29 to 78
23 to 58
Strength to Weight: Bending, points 25 to 48
21 to 38
Thermal Diffusivity, mm2/s 7.4
7.1
Thermal Shock Resistance, points 27 to 72
24 to 59

Alloy Composition

Carbon (C), % 2.2 to 2.5
0.28 to 0.36
Chromium (Cr), % 11.5 to 13.5
3.0 to 3.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.6 to 81.9
87.6 to 93.8
Manganese (Mn), % 0 to 0.6
0.15 to 0.4
Molybdenum (Mo), % 0.7 to 1.2
0
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.6
0.15 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
8.5 to 10
Vanadium (V), % 3.8 to 4.4
0.3 to 0.6

Comparable Variants