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ASTM Grade HK Steel vs. AISI 422 Stainless Steel

Both ASTM grade HK steel and AISI 422 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 32 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 ASTM grade HK steel and the bottom bar is AISI 422 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
260 to 330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
15 to 17
Fatigue Strength, MPa 150
410 to 500
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
76
Tensile Strength: Ultimate (UTS), MPa 500
910 to 1080
Tensile Strength: Yield (Proof), MPa 270
670 to 870

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Maximum Temperature: Corrosion, °C 440
380
Maximum Temperature: Mechanical, °C 1100
650
Melting Completion (Liquidus), °C 1400
1480
Melting Onset (Solidus), °C 1350
1470
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
24
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
4.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
5.3

Otherwise Unclassified Properties

Base Metal Price, % relative 25
11
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 4.4
3.1
Embodied Energy, MJ/kg 63
44
Embodied Water, L/kg 200
100

Common Calculations

PREN (Pitting Resistance) 27
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 48
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 190
1140 to 1910
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
32 to 38
Strength to Weight: Bending, points 18
26 to 30
Thermal Diffusivity, mm2/s 3.9
6.4
Thermal Shock Resistance, points 11
33 to 39

Alloy Composition

Carbon (C), % 0.2 to 0.6
0.2 to 0.25
Chromium (Cr), % 24 to 28
11 to 12.5
Iron (Fe), % 44.8 to 57.8
81.9 to 85.8
Manganese (Mn), % 0 to 2.0
0.5 to 1.0
Molybdenum (Mo), % 0 to 0.5
0.9 to 1.3
Nickel (Ni), % 18 to 22
0.5 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025
Tungsten (W), % 0
0.9 to 1.3
Vanadium (V), % 0
0.2 to 0.3