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AISI 309S Stainless Steel vs. S43940 Stainless Steel

Both AISI 309S stainless steel and S43940 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 81% 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 AISI 309S stainless steel and the bottom bar is S43940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 42
21
Fatigue Strength, MPa 210
180
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 84
76
Shear Modulus, GPa 78
77
Shear Strength, MPa 400
310
Tensile Strength: Ultimate (UTS), MPa 580
490
Tensile Strength: Yield (Proof), MPa 230
280

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 440
540
Maximum Temperature: Mechanical, °C 1080
890
Melting Completion (Liquidus), °C 1420
1440
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 19
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.6
2.6
Embodied Energy, MJ/kg 51
38
Embodied Water, L/kg 170
120

Common Calculations

PREN (Pitting Resistance) 23
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
86
Resilience: Unit (Modulus of Resilience), kJ/m3 140
200
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
18
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 4.0
6.8
Thermal Shock Resistance, points 13
18

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 22 to 24
17.5 to 18.5
Iron (Fe), % 58.1 to 66
78.2 to 82.1
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 12 to 15
0
Niobium (Nb), % 0
0.3 to 0.6
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6