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AISI 418 Stainless Steel vs. ASTM A204 Steel

Both AISI 418 stainless steel and ASTM A204 steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 418 stainless steel and the bottom bar is ASTM A204 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
18 to 22
Fatigue Strength, MPa 520
200 to 220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 680
330 to 360
Tensile Strength: Ultimate (UTS), MPa 1100
520 to 590
Tensile Strength: Yield (Proof), MPa 850
290 to 330

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 770
410
Melting Completion (Liquidus), °C 1500
1470
Melting Onset (Solidus), °C 1460
1420 to 1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
52
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.4
Density, g/cm3 8.0
7.9
Embodied Carbon, kg CO2/kg material 2.9
1.5
Embodied Energy, MJ/kg 41
20
Embodied Water, L/kg 110
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
90 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
220 to 290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
18 to 21
Strength to Weight: Bending, points 29
18 to 20
Thermal Diffusivity, mm2/s 6.7
14
Thermal Shock Resistance, points 40
15 to 17