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S38815 Stainless Steel vs. AISI 418 Stainless Steel

Both S38815 stainless steel and AISI 418 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 29 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 S38815 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 190
200
Elongation at Break, % 34
17
Fatigue Strength, MPa 230
520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
77
Shear Strength, MPa 410
680
Tensile Strength: Ultimate (UTS), MPa 610
1100
Tensile Strength: Yield (Proof), MPa 290
850

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Maximum Temperature: Corrosion, °C 400
390
Maximum Temperature: Mechanical, °C 860
770
Melting Completion (Liquidus), °C 1360
1500
Melting Onset (Solidus), °C 1310
1460
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 15
10

Otherwise Unclassified Properties

Base Metal Price, % relative 19
15
Density, g/cm3 7.5
8.0
Embodied Carbon, kg CO2/kg material 3.8
2.9
Embodied Energy, MJ/kg 54
41
Embodied Water, L/kg 140
110

Common Calculations

PREN (Pitting Resistance) 18
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
170
Resilience: Unit (Modulus of Resilience), kJ/m3 220
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
38
Strength to Weight: Bending, points 21
29
Thermal Shock Resistance, points 15
40

Alloy Composition

Aluminum (Al), % 0 to 0.3
0
Carbon (C), % 0 to 0.030
0.15 to 0.2
Chromium (Cr), % 13 to 15
12 to 14
Copper (Cu), % 0.75 to 1.5
0
Iron (Fe), % 56.1 to 67
78.5 to 83.6
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0.75 to 1.5
0 to 0.5
Nickel (Ni), % 13 to 17
1.8 to 2.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 5.5 to 6.5
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5