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S44800 Stainless Steel vs. AISI 418 Stainless Steel

Both S44800 stainless steel and AISI 418 stainless steel are iron alloys. They have 80% 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 S44800 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 210
200
Elongation at Break, % 23
17
Fatigue Strength, MPa 300
520
Poisson's Ratio 0.27
0.28
Reduction in Area, % 45
50
Shear Modulus, GPa 82
77
Shear Strength, MPa 370
680
Tensile Strength: Ultimate (UTS), MPa 590
1100
Tensile Strength: Yield (Proof), MPa 450
850

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 460
390
Maximum Temperature: Mechanical, °C 1100
770
Melting Completion (Liquidus), °C 1460
1500
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 19
15
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 3.8
2.9
Embodied Energy, MJ/kg 52
41
Embodied Water, L/kg 190
110

Common Calculations

PREN (Pitting Resistance) 42
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
170
Resilience: Unit (Modulus of Resilience), kJ/m3 480
1830
Stiffness to Weight: Axial, points 15
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 4.6
6.7
Thermal Shock Resistance, points 19
40

Alloy Composition

Carbon (C), % 0 to 0.010
0.15 to 0.2
Chromium (Cr), % 28 to 30
12 to 14
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 62.6 to 66.5
78.5 to 83.6
Manganese (Mn), % 0 to 0.3
0 to 0.5
Molybdenum (Mo), % 3.5 to 4.2
0 to 0.5
Nickel (Ni), % 2.0 to 2.5
1.8 to 2.2
Nitrogen (N), % 0 to 0.020
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.2
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5