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AISI 317 Stainless Steel vs. AISI 418 Stainless Steel

Both AISI 317 stainless steel and AISI 418 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 33 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 317 stainless steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 220
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 35 to 55
17
Fatigue Strength, MPa 250 to 330
520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
77
Shear Strength, MPa 420 to 470
680
Tensile Strength: Ultimate (UTS), MPa 580 to 710
1100
Tensile Strength: Yield (Proof), MPa 250 to 420
850

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 420
390
Maximum Temperature: Mechanical, °C 590
770
Melting Completion (Liquidus), °C 1400
1500
Melting Onset (Solidus), °C 1380
1460
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 21
15
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 4.3
2.9
Embodied Energy, MJ/kg 59
41
Embodied Water, L/kg 160
110

Common Calculations

PREN (Pitting Resistance) 31
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210 to 260
170
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 430
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 20 to 25
38
Strength to Weight: Bending, points 20 to 22
29
Thermal Diffusivity, mm2/s 4.1
6.7
Thermal Shock Resistance, points 12 to 15
40

Alloy Composition

Carbon (C), % 0 to 0.080
0.15 to 0.2
Chromium (Cr), % 18 to 20
12 to 14
Iron (Fe), % 58 to 68
78.5 to 83.6
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 3.0 to 4.0
0 to 0.5
Nickel (Ni), % 11 to 15
1.8 to 2.2
Nitrogen (N), % 0 to 0.1
0
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