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S32906 Stainless Steel vs. S81921 Stainless Steel

Both S32906 stainless steel and S81921 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 87% of their average alloy composition in common.

For each property being compared, the top bar is S32906 stainless steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
260
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 28
29
Fatigue Strength, MPa 460
370
Poisson's Ratio 0.27
0.28
Rockwell C Hardness 28
27
Shear Modulus, GPa 81
79
Shear Strength, MPa 550
460
Tensile Strength: Ultimate (UTS), MPa 850
710
Tensile Strength: Yield (Proof), MPa 620
500

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 460
430
Maximum Temperature: Mechanical, °C 1100
990
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 13
15
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 20
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.7
2.9
Embodied Energy, MJ/kg 52
41
Embodied Water, L/kg 190
150

Common Calculations

PREN (Pitting Resistance) 41
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
180
Resilience: Unit (Modulus of Resilience), kJ/m3 950
630
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 30
25
Strength to Weight: Bending, points 26
23
Thermal Diffusivity, mm2/s 3.6
4.0
Thermal Shock Resistance, points 23
20

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 28 to 30
19 to 22
Copper (Cu), % 0 to 0.8
0
Iron (Fe), % 56.6 to 63.6
66.7 to 75.9
Manganese (Mn), % 0.8 to 1.5
2.0 to 4.0
Molybdenum (Mo), % 1.5 to 2.6
1.0 to 2.0
Nickel (Ni), % 5.8 to 7.5
2.0 to 4.0
Nitrogen (N), % 0.3 to 0.4
0.14 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030