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S40930 Stainless Steel vs. S81921 Stainless Steel

Both S40930 stainless steel and S81921 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 84% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S40930 stainless steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 23
29
Fatigue Strength, MPa 130
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
79
Shear Strength, MPa 270
460
Tensile Strength: Ultimate (UTS), MPa 430
710
Tensile Strength: Yield (Proof), MPa 190
500

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 460
430
Maximum Temperature: Mechanical, °C 710
990
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
14
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.3
2.9
Embodied Energy, MJ/kg 32
41
Embodied Water, L/kg 94
150

Common Calculations

PREN (Pitting Resistance) 11
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
180
Resilience: Unit (Modulus of Resilience), kJ/m3 94
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 16
25
Strength to Weight: Bending, points 16
23
Thermal Diffusivity, mm2/s 6.7
4.0
Thermal Shock Resistance, points 16
20

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 10.5 to 11.7
19 to 22
Iron (Fe), % 84.7 to 89.4
66.7 to 75.9
Manganese (Mn), % 0 to 1.0
2.0 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0 to 0.5
2.0 to 4.0
Niobium (Nb), % 0.080 to 0.75
0
Nitrogen (N), % 0 to 0.030
0.14 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0.050 to 0.2
0