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AISI 439 Stainless Steel vs. AISI 304Cu Stainless Steel

Both AISI 439 stainless steel and AISI 304Cu stainless steel are iron alloys. Both are furnished in the annealed condition. They have 87% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 439 stainless steel and the bottom bar is AISI 304Cu stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
160
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
45
Fatigue Strength, MPa 170
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Shear Strength, MPa 310
370
Tensile Strength: Ultimate (UTS), MPa 490
530
Tensile Strength: Yield (Proof), MPa 250
210

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 530
420
Maximum Temperature: Mechanical, °C 890
930
Melting Completion (Liquidus), °C 1510
1410
Melting Onset (Solidus), °C 1430
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
13
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
16
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.3
3.0
Embodied Energy, MJ/kg 34
43
Embodied Water, L/kg 120
150

Common Calculations

PREN (Pitting Resistance) 18
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
190
Resilience: Unit (Modulus of Resilience), kJ/m3 160
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
19
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 6.7
3.5
Thermal Shock Resistance, points 16
12

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 17 to 19
17 to 19
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 77.1 to 82.8
63.9 to 72
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 0 to 0.5
8.0 to 10
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0.2 to 1.1
0