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SAE-AISI 4340M Steel vs. SAE-AISI H25 Steel

Both SAE-AISI 4340M steel and SAE-AISI H25 steel are iron alloys. They have 81% 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 H25 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 2340
710 to 1620

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1440
1750
Melting Onset (Solidus), °C 1400
1700
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 38
26
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
38
Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 1.9
6.2
Embodied Energy, MJ/kg 26
93
Embodied Water, L/kg 55
83

Common Calculations

PREN (Pitting Resistance) 2.2
29
Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 84
22 to 50
Strength to Weight: Bending, points 51
20 to 34
Thermal Diffusivity, mm2/s 10
6.7
Thermal Shock Resistance, points 70
22 to 49

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.22 to 0.32
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
77.2 to 81.3
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
14 to 16
Vanadium (V), % 0.050 to 0.1
0.4 to 0.6