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SAE-AISI M43 Steel vs. SAE-AISI H21 Steel

Both SAE-AISI M43 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 M43 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 810 to 2290
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1550
1630
Melting Onset (Solidus), °C 1500
1580
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 19
27
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 33
23
Density, g/cm3 8.2
8.5
Embodied Carbon, kg CO2/kg material 8.5
4.5
Embodied Energy, MJ/kg 120
68
Embodied Water, L/kg 140
72

Common Calculations

PREN (Pitting Resistance) 35
19
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 27 to 77
23 to 58
Strength to Weight: Bending, points 24 to 47
21 to 38
Thermal Diffusivity, mm2/s 5.3
7.1
Thermal Shock Resistance, points 25 to 71
24 to 59

Alloy Composition

Carbon (C), % 1.2 to 1.3
0.28 to 0.36
Chromium (Cr), % 3.5 to 4.3
3.0 to 3.8
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 70.8 to 76
87.6 to 93.8
Manganese (Mn), % 0.2 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 7.5 to 8.5
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 0.65
0.15 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 2.3 to 3.0
8.5 to 10
Vanadium (V), % 1.5 to 1.8
0.3 to 0.6

Comparable Variants