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AISI 418 Stainless Steel vs. ACI-ASTM CA40F Steel

Both AISI 418 stainless steel and ACI-ASTM CA40F steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a very high 95% 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 CA40F steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
13
Fatigue Strength, MPa 520
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Tensile Strength: Ultimate (UTS), MPa 1100
770
Tensile Strength: Yield (Proof), MPa 850
550

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 770
750
Melting Completion (Liquidus), °C 1500
1430
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
27
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
7.5
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 2.9
2.0
Embodied Energy, MJ/kg 41
28
Embodied Water, L/kg 110
100

Common Calculations

PREN (Pitting Resistance) 19
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
94
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
28
Strength to Weight: Bending, points 29
24
Thermal Diffusivity, mm2/s 6.7
7.2
Thermal Shock Resistance, points 40
28

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.2 to 0.4
Chromium (Cr), % 12 to 14
11.5 to 14
Iron (Fe), % 78.5 to 83.6
81.6 to 88.3
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 1.8 to 2.2
0 to 1.0
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
0.2 to 0.4
Tungsten (W), % 2.5 to 3.5
0