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S82121 Stainless Steel vs. AISI 312 Stainless Steel

Both S82121 stainless steel and AISI 312 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 93% of their average alloy composition in common. There are 34 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 S82121 stainless steel and the bottom bar is AISI 312 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
28
Fatigue Strength, MPa 370
370
Poisson's Ratio 0.27
0.27
Rockwell C Hardness 26
27
Shear Modulus, GPa 78
80
Shear Strength, MPa 470
510
Tensile Strength: Ultimate (UTS), MPa 730
780
Tensile Strength: Yield (Proof), MPa 510
510

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 430
450
Maximum Temperature: Mechanical, °C 1020
1100
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1380
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 14
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.8
3.4
Embodied Energy, MJ/kg 40
48
Embodied Water, L/kg 150
170

Common Calculations

PREN (Pitting Resistance) 28
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
190
Resilience: Unit (Modulus of Resilience), kJ/m3 660
640
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
28
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.0
4.3
Thermal Shock Resistance, points 20
21

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.030
Chromium (Cr), % 21 to 23
24 to 26
Copper (Cu), % 0.2 to 1.2
0
Iron (Fe), % 66.7 to 75.4
62.2 to 69.2
Manganese (Mn), % 1.0 to 2.5
0 to 2.0
Molybdenum (Mo), % 0.3 to 1.3
1.2 to 2.0
Nickel (Ni), % 2.0 to 4.0
5.5 to 6.5
Nitrogen (N), % 0.15 to 0.25
0.14 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030