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AISI 418 Stainless Steel vs. ASTM Grade HK Steel

Both AISI 418 stainless steel and ASTM grade HK steel are iron alloys. They have 67% 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 HK steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
150
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
11
Fatigue Strength, MPa 520
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 1100
500
Tensile Strength: Yield (Proof), MPa 850
270

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Corrosion, °C 390
440
Maximum Temperature: Mechanical, °C 770
1100
Melting Completion (Liquidus), °C 1500
1400
Melting Onset (Solidus), °C 1460
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
25
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.9
4.4
Embodied Energy, MJ/kg 41
63
Embodied Water, L/kg 110
200

Common Calculations

PREN (Pitting Resistance) 19
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
48
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
18
Strength to Weight: Bending, points 29
18
Thermal Diffusivity, mm2/s 6.7
3.9
Thermal Shock Resistance, points 40
11

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.2 to 0.6
Chromium (Cr), % 12 to 14
24 to 28
Iron (Fe), % 78.5 to 83.6
44.8 to 57.8
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
18 to 22
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