SAE-AISI A7 Steel vs. SAE-AISI M4 Steel
Both SAE-AISI A7 steel and SAE-AISI M4 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is SAE-AISI M4 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
200 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 72 | |
76 |
Tensile Strength: Ultimate (UTS), MPa | 800 to 2150 | |
770 to 2150 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
260 |
Melting Completion (Liquidus), °C | 1470 | |
1610 |
Melting Onset (Solidus), °C | 1430 | |
1560 |
Specific Heat Capacity, J/kg-K | 470 | |
440 |
Thermal Conductivity, W/m-K | 37 | |
25 |
Thermal Expansion, µm/m-K | 12 | |
12 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 10 | |
25 |
Density, g/cm3 | 7.7 | |
8.3 |
Embodied Carbon, kg CO2/kg material | 13 | |
14 |
Embodied Energy, MJ/kg | 200 | |
210 |
Embodied Water, L/kg | 100 | |
110 |
Common Calculations
PREN (Pitting Resistance) | 11 | |
30 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 25 | |
23 |
Strength to Weight: Axial, points | 29 to 77 | |
26 to 72 |
Strength to Weight: Bending, points | 25 to 48 | |
23 to 45 |
Thermal Diffusivity, mm2/s | 10 | |
6.9 |
Thermal Shock Resistance, points | 27 to 72 | |
24 to 68 |
Alloy Composition
Carbon (C), % | 2.0 to 2.9 | |
1.3 to 1.4 |
Chromium (Cr), % | 5.0 to 5.8 | |
3.8 to 4.8 |
Copper (Cu), % | 0 to 0.25 | |
0 to 0.25 |
Iron (Fe), % | 81.4 to 87.7 | |
75.9 to 81.4 |
Manganese (Mn), % | 0 to 0.8 | |
0.15 to 0.4 |
Molybdenum (Mo), % | 0.9 to 1.4 | |
4.3 to 5.5 |
Nickel (Ni), % | 0 to 0.3 | |
0 to 0.3 |
Phosphorus (P), % | 0 to 0.030 | |
0 to 0.030 |
Silicon (Si), % | 0 to 0.5 | |
0.2 to 0.45 |
Sulfur (S), % | 0 to 0.030 | |
0 to 0.030 |
Tungsten (W), % | 0.5 to 1.5 | |
5.3 to 6.5 |
Vanadium (V), % | 3.9 to 5.2 | |
3.8 to 4.5 |