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SAE-AISI H21 Steel vs. SAE-AISI T6 Steel

Both SAE-AISI H21 steel and SAE-AISI T6 steel are iron alloys. They have 74% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is SAE-AISI T6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
880 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1630
1830
Melting Onset (Solidus), °C 1580
1770
Specific Heat Capacity, J/kg-K 440
400
Thermal Conductivity, W/m-K 27
18
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Base Metal Price, % relative 23
70
Density, g/cm3 8.5
9.5
Embodied Carbon, kg CO2/kg material 4.5
11
Embodied Energy, MJ/kg 68
170
Embodied Water, L/kg 72
160

Common Calculations

PREN (Pitting Resistance) 19
39
Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 23
21
Strength to Weight: Axial, points 23 to 58
26 to 63
Strength to Weight: Bending, points 21 to 38
21 to 39
Thermal Diffusivity, mm2/s 7.1
4.7
Thermal Shock Resistance, points 24 to 59
26 to 64

Alloy Composition

Carbon (C), % 0.28 to 0.36
0.75 to 0.85
Chromium (Cr), % 3.0 to 3.8
4.0 to 4.8
Cobalt (Co), % 0
11 to 13
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87.6 to 93.8
55.9 to 63.5
Manganese (Mn), % 0.15 to 0.4
0.2 to 0.4
Molybdenum (Mo), % 0
0.4 to 1.0
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
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 8.5 to 10
18.5 to 21
Vanadium (V), % 0.3 to 0.6
1.5 to 2.1

Comparable Variants