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S21800 Stainless Steel vs. AISI 317 Stainless Steel

Both S21800 stainless steel and AISI 317 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is AISI 317 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
170 to 220
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
35 to 55
Fatigue Strength, MPa 330
250 to 330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
79
Shear Strength, MPa 510
420 to 470
Tensile Strength: Ultimate (UTS), MPa 740
580 to 710
Tensile Strength: Yield (Proof), MPa 390
250 to 420

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
590
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1310
1380
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 15
21
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 3.1
4.3
Embodied Energy, MJ/kg 45
59
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 19
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
210 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 390
150 to 430
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
20 to 25
Strength to Weight: Bending, points 24
20 to 22
Thermal Shock Resistance, points 17
12 to 15

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.080
Chromium (Cr), % 16 to 18
18 to 20
Iron (Fe), % 59.1 to 65.4
58 to 68
Manganese (Mn), % 7.0 to 9.0
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 8.0 to 9.0
11 to 15
Nitrogen (N), % 0.080 to 0.18
0 to 0.1
Phosphorus (P), % 0 to 0.060
0 to 0.045
Silicon (Si), % 3.5 to 4.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030