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AISI 422 Stainless Steel vs. SAE-AISI 4340 Steel

Both AISI 422 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 87% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AISI 422 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260 to 330
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 15 to 17
12 to 22
Fatigue Strength, MPa 410 to 500
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 560 to 660
430 to 770
Tensile Strength: Ultimate (UTS), MPa 910 to 1080
690 to 1280
Tensile Strength: Yield (Proof), MPa 670 to 870
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 650
430
Melting Completion (Liquidus), °C 1480
1460
Melting Onset (Solidus), °C 1470
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 24
44
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.7
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 5.3
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 11
3.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.7
Embodied Energy, MJ/kg 44
22
Embodied Water, L/kg 100
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 150
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1910
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 38
24 to 45
Strength to Weight: Bending, points 26 to 30
22 to 33
Thermal Diffusivity, mm2/s 6.4
12
Thermal Shock Resistance, points 33 to 39
20 to 38

Alloy Composition

Carbon (C), % 0.2 to 0.25
0.38 to 0.43
Chromium (Cr), % 11 to 12.5
0.7 to 0.9
Iron (Fe), % 81.9 to 85.8
95.1 to 96.3
Manganese (Mn), % 0.5 to 1.0
0.6 to 0.8
Molybdenum (Mo), % 0.9 to 1.3
0.2 to 0.3
Nickel (Ni), % 0.5 to 1.0
1.7 to 2.0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.040
Tungsten (W), % 0.9 to 1.3
0
Vanadium (V), % 0.2 to 0.3
0