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SAE-AISI 4340M Steel vs. SAE-AISI H26 Steel

Both SAE-AISI 4340M steel and SAE-AISI H26 steel are iron alloys. They have 77% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is SAE-AISI H26 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
80
Tensile Strength: Ultimate (UTS), MPa 2340
720 to 2100

Thermal Properties

Latent Heat of Fusion, J/g 280
240
Melting Completion (Liquidus), °C 1440
1810
Melting Onset (Solidus), °C 1400
1760
Specific Heat Capacity, J/kg-K 480
410
Thermal Conductivity, W/m-K 38
22
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
45
Density, g/cm3 7.8
9.3
Embodied Carbon, kg CO2/kg material 1.9
8.1
Embodied Energy, MJ/kg 26
120
Embodied Water, L/kg 55
90

Common Calculations

PREN (Pitting Resistance) 2.2
34
Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 84
22 to 63
Strength to Weight: Bending, points 51
19 to 39
Thermal Diffusivity, mm2/s 10
5.6
Thermal Shock Resistance, points 70
22 to 63

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.45 to 0.55
Chromium (Cr), % 0.7 to 1.0
3.8 to 4.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.3 to 94.8
73.3 to 77.5
Manganese (Mn), % 0.65 to 0.9
0.15 to 0.4
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
0 to 0.3
Phosphorus (P), % 0 to 0.012
0 to 0.030
Silicon (Si), % 1.5 to 1.8
0.15 to 0.4
Sulfur (S), % 0 to 0.012
0 to 0.030
Tungsten (W), % 0
17.3 to 19
Vanadium (V), % 0.050 to 0.1
0.75 to 1.3