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SAE-AISI M4 Steel vs. R30556 Alloy

Both SAE-AISI M4 steel and R30556 alloy are iron alloys. They have 40% 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 R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
780

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1610
1420
Melting Onset (Solidus), °C 1560
1330
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 25
11
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Base Metal Price, % relative 25
70
Density, g/cm3 8.3
8.4
Embodied Carbon, kg CO2/kg material 14
8.7
Embodied Energy, MJ/kg 210
130
Embodied Water, L/kg 110
300

Common Calculations

PREN (Pitting Resistance) 30
40
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 26 to 72
26
Strength to Weight: Bending, points 23 to 45
22
Thermal Diffusivity, mm2/s 6.9
2.9
Thermal Shock Resistance, points 24 to 68
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 1.3 to 1.4
0.050 to 0.15
Chromium (Cr), % 3.8 to 4.8
21 to 23
Cobalt (Co), % 0
16 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0.15 to 0.4
0.5 to 2.0
Molybdenum (Mo), % 4.3 to 5.5
2.5 to 4.0
Nickel (Ni), % 0 to 0.3
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0.2 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Tungsten (W), % 5.3 to 6.5
2.0 to 3.5
Vanadium (V), % 3.8 to 4.5
0
Zinc (Zn), % 0
0.0010 to 0.1