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AISI 418 Stainless Steel vs. ACI-ASTM CF3M Steel

Both AISI 418 stainless steel and ACI-ASTM CF3M steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 82% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AISI 418 stainless steel and the bottom bar is ACI-ASTM CF3M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
150
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
55
Fatigue Strength, MPa 520
270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 1100
520
Tensile Strength: Yield (Proof), MPa 850
260

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Corrosion, °C 390
420
Maximum Temperature: Mechanical, °C 770
990
Melting Completion (Liquidus), °C 1500
1440
Melting Onset (Solidus), °C 1460
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
16
Thermal Expansion, µm/m-K 10
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
19
Density, g/cm3 8.0
7.9
Embodied Carbon, kg CO2/kg material 2.9
3.8
Embodied Energy, MJ/kg 41
53
Embodied Water, L/kg 110
160

Common Calculations

PREN (Pitting Resistance) 19
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
240
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
18
Strength to Weight: Bending, points 29
18
Thermal Diffusivity, mm2/s 6.7
4.3
Thermal Shock Resistance, points 40
12

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.030
Chromium (Cr), % 12 to 14
17 to 21
Iron (Fe), % 78.5 to 83.6
59.9 to 72
Manganese (Mn), % 0 to 0.5
0 to 1.5
Molybdenum (Mo), % 0 to 0.5
2.0 to 3.0
Nickel (Ni), % 1.8 to 2.2
9.0 to 13
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 2.5 to 3.5
0