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S21904 Stainless Steel vs. AISI 418 Stainless Steel

Both S21904 stainless steel and AISI 418 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 33 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 S21904 stainless steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
17
Fatigue Strength, MPa 380 to 550
520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Shear Strength, MPa 510 to 620
680
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
1100
Tensile Strength: Yield (Proof), MPa 390 to 910
850

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 430
390
Maximum Temperature: Mechanical, °C 980
770
Melting Completion (Liquidus), °C 1400
1500
Melting Onset (Solidus), °C 1350
1460
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Density, g/cm3 7.7
8.0
Embodied Carbon, kg CO2/kg material 3.0
2.9
Embodied Energy, MJ/kg 43
41
Embodied Water, L/kg 160
110

Common Calculations

PREN (Pitting Resistance) 25
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
170
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 36
38
Strength to Weight: Bending, points 23 to 29
29
Thermal Diffusivity, mm2/s 3.8
6.7
Thermal Shock Resistance, points 15 to 21
40

Alloy Composition

Carbon (C), % 0 to 0.040
0.15 to 0.2
Chromium (Cr), % 19 to 21.5
12 to 14
Iron (Fe), % 59.5 to 67.4
78.5 to 83.6
Manganese (Mn), % 8.0 to 10
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 5.5 to 7.5
1.8 to 2.2
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5