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AISI 439 Stainless Steel vs. AISI 303 Stainless Steel

Both AISI 439 stainless steel and AISI 303 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 439 stainless steel and the bottom bar is AISI 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

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

Common Calculations

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

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0 to 0.15
Chromium (Cr), % 17 to 19
17 to 19
Iron (Fe), % 77.1 to 82.8
67.3 to 74.9
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 0.2
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0.15 to 0.35
Titanium (Ti), % 0.2 to 1.1
0