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S21800 Stainless Steel vs. AISI 312 Stainless Steel

Both S21800 stainless steel and AISI 312 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 87% of their average alloy composition in common. There are 30 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 312 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
28
Fatigue Strength, MPa 330
370
Poisson's Ratio 0.28
0.27
Reduction in Area, % 62
56
Shear Modulus, GPa 75
80
Shear Strength, MPa 510
510
Tensile Strength: Ultimate (UTS), MPa 740
780
Tensile Strength: Yield (Proof), MPa 390
510

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Maximum Temperature: Corrosion, °C 410
450
Maximum Temperature: Mechanical, °C 900
1100
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1310
1390
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
17
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.1
3.4
Embodied Energy, MJ/kg 45
48
Embodied Water, L/kg 150
170

Common Calculations

PREN (Pitting Resistance) 19
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
190
Resilience: Unit (Modulus of Resilience), kJ/m3 390
640
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
28
Strength to Weight: Bending, points 24
24
Thermal Shock Resistance, points 17
21

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 16 to 18
24 to 26
Iron (Fe), % 59.1 to 65.4
62.2 to 69.2
Manganese (Mn), % 7.0 to 9.0
0 to 2.0
Molybdenum (Mo), % 0
1.2 to 2.0
Nickel (Ni), % 8.0 to 9.0
5.5 to 6.5
Nitrogen (N), % 0.080 to 0.18
0.14 to 0.2
Phosphorus (P), % 0 to 0.060
0 to 0.045
Silicon (Si), % 3.5 to 4.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030