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AISI 304Cu Stainless Steel vs. S31260 Stainless Steel

Both AISI 304Cu stainless steel and S31260 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 90% of their average alloy composition in common.

For each property being compared, the top bar is AISI 304Cu stainless steel and the bottom bar is S31260 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 45
23
Fatigue Strength, MPa 190
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 76
80
Shear Strength, MPa 370
500
Tensile Strength: Ultimate (UTS), MPa 530
790
Tensile Strength: Yield (Proof), MPa 210
540

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 420
450
Maximum Temperature: Mechanical, °C 930
1100
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 16
20
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.9
Embodied Energy, MJ/kg 43
53
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 18
39
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
160
Resilience: Unit (Modulus of Resilience), kJ/m3 110
720
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
28
Strength to Weight: Bending, points 19
24
Thermal Diffusivity, mm2/s 3.5
4.3
Thermal Shock Resistance, points 12
22

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 17 to 19
24 to 26
Copper (Cu), % 3.0 to 4.0
0.2 to 0.8
Iron (Fe), % 63.9 to 72
59.6 to 67.6
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 8.0 to 10
5.5 to 7.5
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
0.1 to 0.5