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S31727 Stainless Steel vs. AISI 418 Stainless Steel

Both S31727 stainless steel and AISI 418 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S31727 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 240
520
Poisson's Ratio 0.28
0.28
Reduction in Area, % 56
50
Shear Modulus, GPa 78
77
Shear Strength, MPa 430
680
Tensile Strength: Ultimate (UTS), MPa 630
1100
Tensile Strength: Yield (Proof), MPa 270
850

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 420
390
Maximum Temperature: Mechanical, °C 1010
770
Melting Completion (Liquidus), °C 1440
1500
Melting Onset (Solidus), °C 1390
1460
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 24
15
Density, g/cm3 8.0
8.0
Embodied Carbon, kg CO2/kg material 4.7
2.9
Embodied Energy, MJ/kg 64
41
Embodied Water, L/kg 180
110

Common Calculations

PREN (Pitting Resistance) 35
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
170
Resilience: Unit (Modulus of Resilience), kJ/m3 190
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
38
Strength to Weight: Bending, points 20
29
Thermal Shock Resistance, points 14
40

Alloy Composition

Carbon (C), % 0 to 0.030
0.15 to 0.2
Chromium (Cr), % 17.5 to 19
12 to 14
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
78.5 to 83.6
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 3.8 to 4.5
0 to 0.5
Nickel (Ni), % 14.5 to 16.5
1.8 to 2.2
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5