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SAE-AISI H21 Steel vs. SAE-AISI M6 Steel

Both SAE-AISI H21 steel and SAE-AISI M6 steel are iron alloys. They have 81% 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 M6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
840 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1630
1560
Melting Onset (Solidus), °C 1580
1510
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 27
17
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Base Metal Price, % relative 23
39
Density, g/cm3 8.5
8.4
Embodied Carbon, kg CO2/kg material 4.5
8.0
Embodied Energy, MJ/kg 68
120
Embodied Water, L/kg 72
160

Common Calculations

PREN (Pitting Resistance) 19
28
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 23 to 58
28 to 73
Strength to Weight: Bending, points 21 to 38
24 to 45
Thermal Diffusivity, mm2/s 7.1
4.7
Thermal Shock Resistance, points 24 to 59
26 to 68

Alloy Composition

Carbon (C), % 0.28 to 0.36
0.75 to 0.85
Chromium (Cr), % 3.0 to 3.8
3.8 to 4.5
Cobalt (Co), % 0
11 to 13
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
68.8 to 74.6
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0
4.5 to 5.5
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.5
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 8.5 to 10
3.8 to 4.8
Vanadium (V), % 0.3 to 0.6
1.3 to 1.7

Comparable Variants