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AISI 420 Stainless Steel vs. S31655 Stainless Steel

Both AISI 420 stainless steel and S31655 stainless steel are iron alloys. They have 82% 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 S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 8.0 to 15
39
Fatigue Strength, MPa 220 to 670
300
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 84
88
Shear Modulus, GPa 76
78
Shear Strength, MPa 420 to 1010
490
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
710
Tensile Strength: Yield (Proof), MPa 380 to 1310
350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
430
Maximum Temperature: Mechanical, °C 620
1010
Melting Completion (Liquidus), °C 1510
1430
Melting Onset (Solidus), °C 1450
1380
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
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
17
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
3.3
Embodied Energy, MJ/kg 28
46
Embodied Water, L/kg 100
160

Common Calculations

PREN (Pitting Resistance) 14
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
230
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 62
25
Strength to Weight: Bending, points 22 to 41
23
Thermal Diffusivity, mm2/s 7.3
4.0
Thermal Shock Resistance, points 25 to 62
16

Alloy Composition

Carbon (C), % 0.15 to 0.4
0 to 0.030
Chromium (Cr), % 12 to 14
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 82.3 to 87.9
63.2 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0.5 to 1.5
Nickel (Ni), % 0 to 0.75
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
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 0.015