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SAE-AISI M4 Steel vs. SAE-AISI D7 Steel

Both SAE-AISI M4 steel and SAE-AISI D7 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 M4 steel and the bottom bar is SAE-AISI D7 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
73
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
800 to 2120

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1440
Melting Onset (Solidus), °C 1560
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
27
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 25
10
Density, g/cm3 8.3
7.6
Embodied Carbon, kg CO2/kg material 14
11
Embodied Energy, MJ/kg 210
180
Embodied Water, L/kg 110
130

Common Calculations

PREN (Pitting Resistance) 30
16
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
29 to 78
Strength to Weight: Bending, points 23 to 45
25 to 48
Thermal Diffusivity, mm2/s 6.9
7.4
Thermal Shock Resistance, points 24 to 68
27 to 72

Alloy Composition

Carbon (C), % 1.3 to 1.4
2.2 to 2.5
Chromium (Cr), % 3.8 to 4.8
11.5 to 13.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 75.9 to 81.4
76.6 to 81.9
Manganese (Mn), % 0.15 to 0.4
0 to 0.6
Molybdenum (Mo), % 4.3 to 5.5
0.7 to 1.2
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
3.8 to 4.4

Comparable Variants