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AISI 418 Stainless Steel vs. AISI 430F Stainless Steel

Both AISI 418 stainless steel and AISI 430F stainless steel are iron alloys. They have a moderately high 95% of their average alloy composition in common.

For each property being compared, the top bar is AISI 418 stainless steel and the bottom bar is AISI 430F stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
23
Fatigue Strength, MPa 520
210
Poisson's Ratio 0.28
0.28
Reduction in Area, % 50
50
Shear Modulus, GPa 77
77
Shear Strength, MPa 680
340
Tensile Strength: Ultimate (UTS), MPa 1100
540
Tensile Strength: Yield (Proof), MPa 850
310

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 390
410
Maximum Temperature: Mechanical, °C 770
870
Melting Completion (Liquidus), °C 1500
1430
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
25
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
8.5
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 2.9
2.1
Embodied Energy, MJ/kg 41
29
Embodied Water, L/kg 110
120

Common Calculations

PREN (Pitting Resistance) 19
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
20
Strength to Weight: Bending, points 29
19
Thermal Diffusivity, mm2/s 6.7
6.7
Thermal Shock Resistance, points 40
19

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.12
Chromium (Cr), % 12 to 14
16 to 18
Iron (Fe), % 78.5 to 83.6
79.2 to 83.9
Manganese (Mn), % 0 to 0.5
0 to 1.3
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0.15 to 0.35
Tungsten (W), % 2.5 to 3.5
0