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SAE-AISI M4 Steel vs. ASTM A369 Grade FP2

Both SAE-AISI M4 steel and ASTM A369 grade FP2 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 (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is ASTM A369 grade FP2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
430

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1610
1470
Melting Onset (Solidus), °C 1560
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
49
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
2.6
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 14
1.6
Embodied Energy, MJ/kg 210
20
Embodied Water, L/kg 110
50

Common Calculations

PREN (Pitting Resistance) 30
2.5
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
15
Strength to Weight: Bending, points 23 to 45
16
Thermal Diffusivity, mm2/s 6.9
13
Thermal Shock Resistance, points 24 to 68
13

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.1 to 0.2
Chromium (Cr), % 3.8 to 4.8
0.5 to 0.81
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
97.4 to 98.6
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.61
Molybdenum (Mo), % 4.3 to 5.5
0.44 to 0.65
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 0.45
0.1 to 0.3
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0