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AISI 309Cb Stainless Steel vs. AISI 439 Stainless Steel

Both AISI 309Cb stainless steel and AISI 439 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 80% of their average alloy composition in common. There are 35 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 309Cb stainless steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
23
Fatigue Strength, MPa 200
170
Poisson's Ratio 0.28
0.28
Reduction in Area, % 46
51
Rockwell B Hardness 84
78
Shear Modulus, GPa 78
77
Shear Strength, MPa 390
310
Tensile Strength: Ultimate (UTS), MPa 580
490
Tensile Strength: Yield (Proof), MPa 230
250

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 510
530
Maximum Temperature: Mechanical, °C 1090
890
Melting Completion (Liquidus), °C 1420
1510
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 16
11

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 23
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.1
2.3
Embodied Energy, MJ/kg 59
34
Embodied Water, L/kg 170
120

Common Calculations

PREN (Pitting Resistance) 23
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
95
Resilience: Unit (Modulus of Resilience), kJ/m3 140
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 20
18
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 4.0
6.7
Thermal Shock Resistance, points 13
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 22 to 24
17 to 19
Iron (Fe), % 56 to 66
77.1 to 82.8
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 12 to 16
0 to 0.5
Niobium (Nb), % 0 to 1.1
0
Nitrogen (N), % 0
0 to 0.030
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 0.030
Titanium (Ti), % 0
0.2 to 1.1