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AISI 303 Stainless Steel vs. AISI 439 Stainless Steel

Both AISI 303 stainless steel and AISI 439 stainless steel are iron alloys. They have a moderately high 90% of their average alloy composition in common. There are 34 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AISI 303 stainless steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40 to 51
23
Fatigue Strength, MPa 230 to 360
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 430 to 470
310
Tensile Strength: Ultimate (UTS), MPa 600 to 690
490
Tensile Strength: Yield (Proof), MPa 230 to 420
250

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 410
530
Maximum Temperature: Mechanical, °C 930
890
Melting Completion (Liquidus), °C 1450
1510
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
25
Thermal Expansion, µm/m-K 17
11

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.0
Calomel Potential, mV -80
-220
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.0
2.3
Embodied Energy, MJ/kg 42
34
Embodied Water, L/kg 140
120

Common Calculations

PREN (Pitting Resistance) 18
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
95
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 440
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
18
Strength to Weight: Bending, points 20 to 22
18
Thermal Diffusivity, mm2/s 4.4
6.7
Thermal Shock Resistance, points 13 to 15
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 17 to 19
17 to 19
Iron (Fe), % 67.3 to 74.9
77.1 to 82.8
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 8.0 to 10
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.2
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0.15 to 0.35
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1