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AISI 439 Stainless Steel vs. S44725 Stainless Steel

Both AISI 439 stainless steel and S44725 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 89% 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 S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
22
Fatigue Strength, MPa 170
210
Poisson's Ratio 0.28
0.27
Rockwell B Hardness 78
84
Shear Modulus, GPa 77
81
Shear Strength, MPa 310
320
Tensile Strength: Ultimate (UTS), MPa 490
500
Tensile Strength: Yield (Proof), MPa 250
310

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 530
500
Maximum Temperature: Mechanical, °C 890
1100
Melting Completion (Liquidus), °C 1510
1450
Melting Onset (Solidus), °C 1430
1410
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
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.3
3.1
Embodied Energy, MJ/kg 34
44
Embodied Water, L/kg 120
170

Common Calculations

PREN (Pitting Resistance) 18
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
99
Resilience: Unit (Modulus of Resilience), kJ/m3 160
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
18
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 6.7
4.6
Thermal Shock Resistance, points 16
16

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0 to 0.015
Chromium (Cr), % 17 to 19
25 to 28.5
Iron (Fe), % 77.1 to 82.8
67.6 to 73.5
Manganese (Mn), % 0 to 1.0
0 to 0.4
Molybdenum (Mo), % 0
1.5 to 2.5
Nickel (Ni), % 0 to 0.5
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0 to 0.030
0 to 0.018
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.040
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0.2 to 1.1
0 to 0.26