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AISI 309S Stainless Steel vs. AISI 418 Stainless Steel

Both AISI 309S stainless steel and AISI 418 stainless steel are iron alloys. They have 78% of their average alloy composition in common. There are 34 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is AISI 309S stainless steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 42
17
Fatigue Strength, MPa 210
520
Poisson's Ratio 0.27
0.28
Reduction in Area, % 51
50
Shear Modulus, GPa 78
77
Shear Strength, MPa 400
680
Tensile Strength: Ultimate (UTS), MPa 580
1100
Tensile Strength: Yield (Proof), MPa 230
850

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 440
390
Maximum Temperature: Mechanical, °C 1080
770
Melting Completion (Liquidus), °C 1420
1500
Melting Onset (Solidus), °C 1370
1460
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 19
15
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 3.6
2.9
Embodied Energy, MJ/kg 51
41
Embodied Water, L/kg 170
110

Common Calculations

PREN (Pitting Resistance) 23
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
170
Resilience: Unit (Modulus of Resilience), kJ/m3 140
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
38
Strength to Weight: Bending, points 20
29
Thermal Diffusivity, mm2/s 4.0
6.7
Thermal Shock Resistance, points 13
40

Alloy Composition

Carbon (C), % 0 to 0.080
0.15 to 0.2
Chromium (Cr), % 22 to 24
12 to 14
Iron (Fe), % 58.1 to 66
78.5 to 83.6
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 12 to 15
1.8 to 2.2
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5