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SAE-AISI M4 Steel vs. ASTM B817 Type II

SAE-AISI M4 steel belongs to the iron alloys classification, while ASTM B817 type II belongs to the titanium alloys. There are 19 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 B817 type II.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
100
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 76
40
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
900 to 960

Thermal Properties

Latent Heat of Fusion, J/g 260
400
Melting Completion (Liquidus), °C 1610
1580
Melting Onset (Solidus), °C 1560
1530
Specific Heat Capacity, J/kg-K 440
550
Thermal Expansion, µm/m-K 12
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 25
37
Density, g/cm3 8.3
4.6
Embodied Carbon, kg CO2/kg material 14
40
Embodied Energy, MJ/kg 210
650
Embodied Water, L/kg 110
220

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
34
Strength to Weight: Axial, points 26 to 72
55 to 58
Strength to Weight: Bending, points 23 to 45
45 to 47
Thermal Shock Resistance, points 24 to 68
62 to 66

Alloy Composition

Aluminum (Al), % 0
5.0 to 6.0
Carbon (C), % 1.3 to 1.4
0 to 0.1
Chlorine (Cl), % 0
0 to 0.2
Chromium (Cr), % 3.8 to 4.8
0
Copper (Cu), % 0 to 0.25
0.35 to 1.0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 75.9 to 81.4
0.35 to 1.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.3 to 5.5
0
Nickel (Ni), % 0 to 0.3
0
Nitrogen (N), % 0
0 to 0.040
Oxygen (O), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0 to 0.1
Sodium (Na), % 0
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
1.5 to 2.5
Titanium (Ti), % 0
82.1 to 87.8
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
5.0 to 6.0
Residuals, % 0
0 to 0.4