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

Both SAE-AISI M6 steel and SAE-AISI H21 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 M6 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 0.29
0.29
Shear Modulus, GPa 77
76
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
720 to 1790

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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

Comparable Variants