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SAE-AISI M4 Steel vs. ASTM A387 Grade 2 Steel

Both SAE-AISI M4 steel and ASTM A387 grade 2 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 (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 A387 grade 2 steel.

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
470 to 550

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1610
1470
Melting Onset (Solidus), °C 1560
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
45
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
2.4
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
16 to 20
Strength to Weight: Bending, points 23 to 45
17 to 19
Thermal Diffusivity, mm2/s 6.9
12
Thermal Shock Resistance, points 24 to 68
14 to 16

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.050 to 0.21
Chromium (Cr), % 3.8 to 4.8
0.5 to 0.8
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
97.1 to 98.3
Manganese (Mn), % 0.15 to 0.4
0.55 to 0.8
Molybdenum (Mo), % 4.3 to 5.5
0.45 to 0.6
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 0.45
0.15 to 0.4
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

Comparable Variants