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S21800 Stainless Steel vs. AISI 317LMN Stainless Steel

Both S21800 stainless steel and AISI 317LMN stainless steel are iron alloys. Both are furnished in the annealed condition. They have 87% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
45
Fatigue Strength, MPa 330
250
Poisson's Ratio 0.28
0.28
Reduction in Area, % 62
56
Rockwell B Hardness 88
84
Shear Modulus, GPa 75
79
Shear Strength, MPa 510
430
Tensile Strength: Ultimate (UTS), MPa 740
620
Tensile Strength: Yield (Proof), MPa 390
270

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
1020
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1310
1410
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
24
Density, g/cm3 7.5
8.0
Embodied Carbon, kg CO2/kg material 3.1
4.8
Embodied Energy, MJ/kg 45
65
Embodied Water, L/kg 150
170

Common Calculations

PREN (Pitting Resistance) 19
36
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
230
Resilience: Unit (Modulus of Resilience), kJ/m3 390
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
22
Strength to Weight: Bending, points 24
20
Thermal Shock Resistance, points 17
14

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 16 to 18
17 to 20
Iron (Fe), % 59.1 to 65.4
54.4 to 65.4
Manganese (Mn), % 7.0 to 9.0
0 to 2.0
Molybdenum (Mo), % 0
4.0 to 5.0
Nickel (Ni), % 8.0 to 9.0
13.5 to 17.5
Nitrogen (N), % 0.080 to 0.18
0.1 to 0.2
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