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AISI 420 Stainless Steel vs. S33550 Stainless Steel

Both AISI 420 stainless steel and S33550 stainless steel are iron alloys. They have 68% of their average alloy composition in common.

For each property being compared, the top bar is AISI 420 stainless steel and the bottom bar is S33550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 8.0 to 15
40
Fatigue Strength, MPa 220 to 670
270
Poisson's Ratio 0.28
0.27
Rockwell B Hardness 84
82
Shear Modulus, GPa 76
79
Shear Strength, MPa 420 to 1010
470
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
680
Tensile Strength: Yield (Proof), MPa 380 to 1310
310

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 390
470
Maximum Temperature: Mechanical, °C 620
1100
Melting Completion (Liquidus), °C 1510
1400
Melting Onset (Solidus), °C 1450
1360
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 10
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
24
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
4.3
Embodied Energy, MJ/kg 28
61
Embodied Water, L/kg 100
190

Common Calculations

PREN (Pitting Resistance) 14
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
220
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 62
24
Strength to Weight: Bending, points 22 to 41
22
Thermal Diffusivity, mm2/s 7.3
3.9
Thermal Shock Resistance, points 25 to 62
15

Alloy Composition

Carbon (C), % 0.15 to 0.4
0.040 to 0.1
Cerium (Ce), % 0
0.025 to 0.070
Chromium (Cr), % 12 to 14
25 to 28
Iron (Fe), % 82.3 to 87.9
48.8 to 58.2
Lanthanum (La), % 0
0.025 to 0.070
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 0.75
16.5 to 20
Niobium (Nb), % 0
0.050 to 0.15
Nitrogen (N), % 0
0.18 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030