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S31254 Stainless Steel vs. AISI 418 Stainless Steel

Both S31254 stainless steel and AISI 418 stainless steel are iron alloys. They have 70% 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 S31254 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, % 40
17
Fatigue Strength, MPa 290
520
Poisson's Ratio 0.28
0.28
Reduction in Area, % 56
50
Shear Modulus, GPa 80
77
Shear Strength, MPa 490
680
Tensile Strength: Ultimate (UTS), MPa 720
1100
Tensile Strength: Yield (Proof), MPa 330
850

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 420
390
Maximum Temperature: Mechanical, °C 1090
770
Melting Completion (Liquidus), °C 1460
1500
Melting Onset (Solidus), °C 1420
1460
Specific Heat Capacity, J/kg-K 460
470
Thermal Conductivity, W/m-K 14
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 28
15
Density, g/cm3 8.0
8.0
Embodied Carbon, kg CO2/kg material 5.5
2.9
Embodied Energy, MJ/kg 74
41
Embodied Water, L/kg 190
110

Common Calculations

PREN (Pitting Resistance) 44
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
170
Resilience: Unit (Modulus of Resilience), kJ/m3 270
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25
38
Strength to Weight: Bending, points 22
29
Thermal Diffusivity, mm2/s 3.8
6.7
Thermal Shock Resistance, points 15
40

Alloy Composition

Carbon (C), % 0 to 0.020
0.15 to 0.2
Chromium (Cr), % 19.5 to 20.5
12 to 14
Copper (Cu), % 0.5 to 1.0
0
Iron (Fe), % 51.4 to 56.3
78.5 to 83.6
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 6.0 to 6.5
0 to 0.5
Nickel (Ni), % 17.5 to 18.5
1.8 to 2.2
Nitrogen (N), % 0.18 to 0.22
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.8
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5