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S42300 Stainless Steel vs. AISI 418 Stainless Steel

Both S42300 stainless steel and AISI 418 stainless steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a moderately high 94% 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 S42300 stainless steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 9.1
17
Fatigue Strength, MPa 440
520
Poisson's Ratio 0.28
0.28
Reduction in Area, % 22
50
Shear Modulus, GPa 77
77
Shear Strength, MPa 650
680
Tensile Strength: Ultimate (UTS), MPa 1100
1100
Tensile Strength: Yield (Proof), MPa 850
850

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Corrosion, °C 380
390
Maximum Temperature: Mechanical, °C 750
770
Melting Completion (Liquidus), °C 1470
1500
Melting Onset (Solidus), °C 1420
1460
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
25
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.5
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 5.2
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 3.2
2.9
Embodied Energy, MJ/kg 44
41
Embodied Water, L/kg 110
110

Common Calculations

PREN (Pitting Resistance) 21
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 93
170
Resilience: Unit (Modulus of Resilience), kJ/m3 1840
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 39
38
Strength to Weight: Bending, points 30
29
Thermal Diffusivity, mm2/s 6.8
6.7
Thermal Shock Resistance, points 40
40

Alloy Composition

Carbon (C), % 0.27 to 0.32
0.15 to 0.2
Chromium (Cr), % 11 to 12
12 to 14
Iron (Fe), % 82 to 85.1
78.5 to 83.6
Manganese (Mn), % 1.0 to 1.4
0 to 0.5
Molybdenum (Mo), % 2.5 to 3.0
0 to 0.5
Nickel (Ni), % 0 to 0.5
1.8 to 2.2
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5
Vanadium (V), % 0.2 to 0.3
0