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AISI 418 Stainless Steel vs. AISI 329 Stainless Steel

Both AISI 418 stainless steel and AISI 329 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 33 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 AISI 329 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
240
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
17
Fatigue Strength, MPa 520
330
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
80
Shear Strength, MPa 680
440
Tensile Strength: Ultimate (UTS), MPa 1100
710
Tensile Strength: Yield (Proof), MPa 850
540

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Corrosion, °C 390
450
Maximum Temperature: Mechanical, °C 770
1100
Melting Completion (Liquidus), °C 1500
1440
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
16
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
16
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 2.9
3.1
Embodied Energy, MJ/kg 41
44
Embodied Water, L/kg 110
170

Common Calculations

PREN (Pitting Resistance) 19
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
730
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
25
Strength to Weight: Bending, points 29
23
Thermal Diffusivity, mm2/s 6.7
4.3
Thermal Shock Resistance, points 40
19

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.080
Chromium (Cr), % 12 to 14
23 to 28
Iron (Fe), % 78.5 to 83.6
63.1 to 74
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
1.0 to 2.0
Nickel (Ni), % 1.8 to 2.2
2.0 to 5.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 2.5 to 3.5
0