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S21800 Stainless Steel vs. AISI 431 Stainless Steel

Both S21800 stainless steel and AISI 431 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 29 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 S21800 stainless steel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
15 to 17
Fatigue Strength, MPa 330
430 to 610
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Shear Strength, MPa 510
550 to 840
Tensile Strength: Ultimate (UTS), MPa 740
890 to 1380
Tensile Strength: Yield (Proof), MPa 390
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Corrosion, °C 410
400
Maximum Temperature: Mechanical, °C 900
850
Melting Completion (Liquidus), °C 1360
1510
Melting Onset (Solidus), °C 1310
1450
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.0
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.2
Embodied Energy, MJ/kg 45
31
Embodied Water, L/kg 150
120

Common Calculations

PREN (Pitting Resistance) 19
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 390
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
32 to 50
Strength to Weight: Bending, points 24
27 to 36
Thermal Shock Resistance, points 17
28 to 43

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.2
Chromium (Cr), % 16 to 18
15 to 17
Iron (Fe), % 59.1 to 65.4
78.2 to 83.8
Manganese (Mn), % 7.0 to 9.0
0 to 1.0
Nickel (Ni), % 8.0 to 9.0
1.3 to 2.5
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030