SAE-AISI M4 Steel vs. SAE-AISI M7 Steel
Both SAE-AISI M4 steel and SAE-AISI M7 steel are iron alloys. They have a moderately high 93% 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 M7 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 | 76 | |
77 |
Tensile Strength: Ultimate (UTS), MPa | 770 to 2150 | |
760 to 2210 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
270 |
Melting Completion (Liquidus), °C | 1610 | |
1560 |
Melting Onset (Solidus), °C | 1560 | |
1510 |
Specific Heat Capacity, J/kg-K | 440 | |
450 |
Thermal Conductivity, W/m-K | 25 | |
28 |
Thermal Expansion, µm/m-K | 12 | |
12 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 25 | |
18 |
Density, g/cm3 | 8.3 | |
8.1 |
Embodied Carbon, kg CO2/kg material | 14 | |
8.9 |
Embodied Energy, MJ/kg | 210 | |
130 |
Embodied Water, L/kg | 110 | |
100 |
Common Calculations
PREN (Pitting Resistance) | 30 | |
35 |
Stiffness to Weight: Axial, points | 13 | |
14 |
Stiffness to Weight: Bending, points | 23 | |
24 |
Strength to Weight: Axial, points | 26 to 72 | |
26 to 76 |
Strength to Weight: Bending, points | 23 to 45 | |
23 to 47 |
Thermal Diffusivity, mm2/s | 6.9 | |
7.8 |
Thermal Shock Resistance, points | 24 to 68 | |
24 to 69 |
Alloy Composition
Carbon (C), % | 1.3 to 1.4 | |
1.0 to 1.1 |
Chromium (Cr), % | 3.8 to 4.8 | |
3.5 to 4.0 |
Copper (Cu), % | 0 to 0.25 | |
0 to 0.25 |
Iron (Fe), % | 75.9 to 81.4 | |
79.8 to 83.8 |
Manganese (Mn), % | 0.15 to 0.4 | |
0.15 to 0.4 |
Molybdenum (Mo), % | 4.3 to 5.5 | |
8.2 to 9.2 |
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 | |
0.2 to 0.55 |
Sulfur (S), % | 0 to 0.030 | |
0 to 0.030 |
Tungsten (W), % | 5.3 to 6.5 | |
1.4 to 2.1 |
Vanadium (V), % | 3.8 to 4.5 | |
1.8 to 2.3 |