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AISI 418 Stainless Steel vs. ASTM Grade HE Steel

Both AISI 418 stainless steel and ASTM grade HE steel are iron alloys. They have 76% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, 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 grade HE steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
10
Fatigue Strength, MPa 520
160
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 1100
670
Tensile Strength: Yield (Proof), MPa 850
310

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Corrosion, °C 390
450
Maximum Temperature: Mechanical, °C 770
1100
Melting Completion (Liquidus), °C 1500
1400
Melting Onset (Solidus), °C 1460
1360
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 25
14
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
19
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 2.9
3.5
Embodied Energy, MJ/kg 41
50
Embodied Water, L/kg 110
190

Common Calculations

PREN (Pitting Resistance) 19
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
56
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
24
Strength to Weight: Bending, points 29
22
Thermal Diffusivity, mm2/s 6.7
3.6
Thermal Shock Resistance, points 40
14

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.2 to 0.5
Chromium (Cr), % 12 to 14
26 to 30
Iron (Fe), % 78.5 to 83.6
53.9 to 65.8
Manganese (Mn), % 0 to 0.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 1.8 to 2.2
8.0 to 11
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 2.5 to 3.5
0