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AISI 446 Stainless Steel vs. AISI 439 Stainless Steel

Both AISI 446 stainless steel and AISI 439 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is AISI 446 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, % 23
23
Fatigue Strength, MPa 200
170
Poisson's Ratio 0.27
0.28
Reduction in Area, % 50
51
Rockwell B Hardness 84
78
Shear Modulus, GPa 79
77
Shear Strength, MPa 360
310
Tensile Strength: Ultimate (UTS), MPa 570
490
Tensile Strength: Yield (Proof), MPa 300
250

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 440
530
Maximum Temperature: Mechanical, °C 1180
890
Melting Completion (Liquidus), °C 1510
1510
Melting Onset (Solidus), °C 1430
1430
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 17
25
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.0
Calomel Potential, mV -230
-220
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.4
2.3
Embodied Energy, MJ/kg 35
34
Embodied Water, L/kg 150
120

Common Calculations

PREN (Pitting Resistance) 27
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
95
Resilience: Unit (Modulus of Resilience), kJ/m3 230
160
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 21
18
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 4.6
6.7
Thermal Shock Resistance, points 19
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0 to 0.2
0 to 0.030
Chromium (Cr), % 23 to 27
17 to 19
Iron (Fe), % 69.2 to 77
77.1 to 82.8
Manganese (Mn), % 0 to 1.5
0 to 1.0
Nickel (Ni), % 0 to 0.75
0 to 0.5
Nitrogen (N), % 0 to 0.25
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1