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SAE-AISI H25 Steel vs. SAE-AISI M4 Steel

Both SAE-AISI H25 steel and SAE-AISI M4 steel are iron alloys. They have a moderately high 90% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI H25 steel and the bottom bar is SAE-AISI M4 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 79
76
Tensile Strength: Ultimate (UTS), MPa 710 to 1620
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1750
1610
Melting Onset (Solidus), °C 1700
1560
Specific Heat Capacity, J/kg-K 420
440
Thermal Conductivity, W/m-K 26
25
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 38
25
Density, g/cm3 9.1
8.3
Embodied Carbon, kg CO2/kg material 6.2
14
Embodied Energy, MJ/kg 93
210
Embodied Water, L/kg 83
110

Common Calculations

PREN (Pitting Resistance) 29
30
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 22 to 50
26 to 72
Strength to Weight: Bending, points 20 to 34
23 to 45
Thermal Diffusivity, mm2/s 6.7
6.9
Thermal Shock Resistance, points 22 to 49
24 to 68

Alloy Composition

Carbon (C), % 0.22 to 0.32
1.3 to 1.4
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 77.2 to 81.3
75.9 to 81.4
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0
4.3 to 5.5
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 0.4
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
5.3 to 6.5
Vanadium (V), % 0.4 to 0.6
3.8 to 4.5

Comparable Variants