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AISI 420 Stainless Steel vs. AISI 384 Stainless Steel

Both AISI 420 stainless steel and AISI 384 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AISI 420 stainless steel and the bottom bar is AISI 384 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
150
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
480

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
410
Maximum Temperature: Mechanical, °C 620
910
Melting Completion (Liquidus), °C 1510
1420
Melting Onset (Solidus), °C 1450
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
16
Thermal Expansion, µm/m-K 10
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
20
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.0
3.7
Embodied Energy, MJ/kg 28
52
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 14
16
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 62
17
Strength to Weight: Bending, points 22 to 41
17
Thermal Diffusivity, mm2/s 7.3
4.3
Thermal Shock Resistance, points 25 to 62
11

Alloy Composition

Carbon (C), % 0.15 to 0.4
0 to 0.040
Chromium (Cr), % 12 to 14
15 to 17
Iron (Fe), % 82.3 to 87.9
60.9 to 68
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 0.75
17 to 19
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030