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AISI 334 Stainless Steel vs. AISI 418 Stainless Steel

Both AISI 334 stainless steel and AISI 418 stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is AISI 334 stainless steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
17
Fatigue Strength, MPa 150
520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 360
680
Tensile Strength: Ultimate (UTS), MPa 540
1100
Tensile Strength: Yield (Proof), MPa 190
850

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 490
390
Maximum Temperature: Mechanical, °C 1000
770
Melting Completion (Liquidus), °C 1410
1500
Melting Onset (Solidus), °C 1370
1460
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 22
15
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 4.1
2.9
Embodied Energy, MJ/kg 59
41
Embodied Water, L/kg 170
110

Common Calculations

PREN (Pitting Resistance) 19
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
170
Resilience: Unit (Modulus of Resilience), kJ/m3 96
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
38
Strength to Weight: Bending, points 19
29
Thermal Shock Resistance, points 12
40

Alloy Composition

Aluminum (Al), % 0.15 to 0.6
0
Carbon (C), % 0 to 0.080
0.15 to 0.2
Chromium (Cr), % 18 to 20
12 to 14
Iron (Fe), % 55.7 to 62.7
78.5 to 83.6
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 19 to 21
1.8 to 2.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0.15 to 0.6
0
Tungsten (W), % 0
2.5 to 3.5