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S21800 Stainless Steel vs. S31730 Stainless Steel

Both S21800 stainless steel and S31730 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 84% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
40
Fatigue Strength, MPa 330
170
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 88
78
Shear Modulus, GPa 75
77
Shear Strength, MPa 510
370
Tensile Strength: Ultimate (UTS), MPa 740
540
Tensile Strength: Yield (Proof), MPa 390
200

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
990
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1310
1390
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
4.6
Embodied Energy, MJ/kg 45
63
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 19
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
170
Resilience: Unit (Modulus of Resilience), kJ/m3 390
99
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
19
Strength to Weight: Bending, points 24
18
Thermal Shock Resistance, points 17
12

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 16 to 18
17 to 19
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 59.1 to 65.4
52.4 to 61
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
15 to 16.5
Nitrogen (N), % 0.080 to 0.18
0 to 0.045
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 0.010