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SAE-AISI M4 Steel vs. ASTM A387 Grade 9 Steel

Both SAE-AISI M4 steel and ASTM A387 grade 9 steel are iron alloys. They have 85% 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 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
500 to 600

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1460
Melting Onset (Solidus), °C 1560
1410
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
26
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
6.5
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 14
2.1
Embodied Energy, MJ/kg 210
28
Embodied Water, L/kg 110
87

Common Calculations

PREN (Pitting Resistance) 30
12
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
18 to 21
Strength to Weight: Bending, points 23 to 45
18 to 20
Thermal Diffusivity, mm2/s 6.9
6.9
Thermal Shock Resistance, points 24 to 68
14 to 17

Alloy Composition

Carbon (C), % 1.3 to 1.4
0 to 0.15
Chromium (Cr), % 3.8 to 4.8
8.0 to 10
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
87.1 to 90.8
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 4.3 to 5.5
0.9 to 1.1
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 to 1.0
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 to 0.040

Comparable Variants