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AISI 439 Stainless Steel vs. S44625 Stainless Steel

Both AISI 439 stainless steel and S44625 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 91% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AISI 439 stainless steel and the bottom bar is S44625 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
22
Fatigue Strength, MPa 170
240
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
80
Shear Strength, MPa 310
370
Tensile Strength: Ultimate (UTS), MPa 490
590
Tensile Strength: Yield (Proof), MPa 250
360

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 530
450
Maximum Temperature: Mechanical, °C 890
1100
Melting Completion (Liquidus), °C 1510
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
17
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.3
2.8
Embodied Energy, MJ/kg 34
39
Embodied Water, L/kg 120
160

Common Calculations

PREN (Pitting Resistance) 18
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
110
Resilience: Unit (Modulus of Resilience), kJ/m3 160
310
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
21
Strength to Weight: Bending, points 18
20
Thermal Diffusivity, mm2/s 6.7
4.6
Thermal Shock Resistance, points 16
19

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0 to 0.010
Chromium (Cr), % 17 to 19
25 to 27.5
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 77.1 to 82.8
69.4 to 74.3
Manganese (Mn), % 0 to 1.0
0 to 0.4
Molybdenum (Mo), % 0
0.75 to 1.5
Nickel (Ni), % 0 to 0.5
0 to 0.5
Nitrogen (N), % 0 to 0.030
0 to 0.015
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0.2 to 1.1
0