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AISI 309 Stainless Steel vs. S31655 Stainless Steel

Both AISI 309 stainless steel and S31655 stainless steel are iron alloys. They have a moderately high 93% of their average alloy composition in common.

For each property being compared, the top bar is AISI 309 stainless steel and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 210
210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34 to 47
39
Fatigue Strength, MPa 250 to 280
300
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 84
88
Shear Modulus, GPa 78
78
Shear Strength, MPa 420 to 470
490
Tensile Strength: Ultimate (UTS), MPa 600 to 710
710
Tensile Strength: Yield (Proof), MPa 260 to 350
350

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 440
430
Maximum Temperature: Mechanical, °C 980
1010
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 15
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 19
17
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
3.3
Embodied Energy, MJ/kg 51
46
Embodied Water, L/kg 170
160

Common Calculations

PREN (Pitting Resistance) 23
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
230
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
25
Strength to Weight: Bending, points 20 to 23
23
Thermal Diffusivity, mm2/s 4.3
4.0
Thermal Shock Resistance, points 14 to 16
16

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.030
Chromium (Cr), % 22 to 24
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 58 to 66
63.2 to 71.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
0.5 to 1.5
Nickel (Ni), % 12 to 15
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015