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AISI 418 Stainless Steel vs. ACI-ASTM CA6N Steel

Both AISI 418 stainless steel and ACI-ASTM CA6N steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a moderately 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 CA6N steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
17
Fatigue Strength, MPa 520
640
Poisson's Ratio 0.28
0.28
Reduction in Area, % 50
57
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 1100
1080
Tensile Strength: Yield (Proof), MPa 850
1060

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 770
740
Melting Completion (Liquidus), °C 1500
1440
Melting Onset (Solidus), °C 1460
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
23
Thermal Expansion, µm/m-K 10
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 15
11
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.9
2.5
Embodied Energy, MJ/kg 41
35
Embodied Water, L/kg 110
110

Common Calculations

PREN (Pitting Resistance) 19
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
180
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
2900
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
38
Strength to Weight: Bending, points 29
30
Thermal Diffusivity, mm2/s 6.7
6.1
Thermal Shock Resistance, points 40
40

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.060
Chromium (Cr), % 12 to 14
10.5 to 12.5
Iron (Fe), % 78.5 to 83.6
77.9 to 83.5
Manganese (Mn), % 0 to 0.5
0 to 0.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
6.0 to 8.0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 2.5 to 3.5
0