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S32803 Stainless Steel vs. S31655 Stainless Steel

Both S32803 stainless steel and S31655 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is S32803 stainless steel and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
210
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 18
39
Fatigue Strength, MPa 350
300
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 86
88
Shear Modulus, GPa 81
78
Shear Strength, MPa 420
490
Tensile Strength: Ultimate (UTS), MPa 680
710
Tensile Strength: Yield (Proof), MPa 560
350

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 510
430
Maximum Temperature: Mechanical, °C 1100
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 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 19
17
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.7
3.3
Embodied Energy, MJ/kg 53
46
Embodied Water, L/kg 180
160

Common Calculations

PREN (Pitting Resistance) 36
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
230
Resilience: Unit (Modulus of Resilience), kJ/m3 760
310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
25
Strength to Weight: Bending, points 22
23
Thermal Diffusivity, mm2/s 4.4
4.0
Thermal Shock Resistance, points 22
16

Alloy Composition

Carbon (C), % 0 to 0.015
0 to 0.030
Chromium (Cr), % 28 to 29
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 62.9 to 67.1
63.2 to 71.9
Manganese (Mn), % 0 to 0.5
0 to 2.0
Molybdenum (Mo), % 1.8 to 2.5
0.5 to 1.5
Nickel (Ni), % 3.0 to 4.0
8.0 to 9.5
Niobium (Nb), % 0.15 to 0.5
0
Nitrogen (N), % 0 to 0.020
0.14 to 0.25
Phosphorus (P), % 0 to 0.020
0 to 0.045
Silicon (Si), % 0 to 0.55
0 to 1.0
Sulfur (S), % 0 to 0.0035
0 to 0.015