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AISI 329 Stainless Steel vs. AISI 444 Stainless Steel

Both AISI 329 stainless steel and AISI 444 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 90% of their average alloy composition in common. There are 33 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 329 stainless steel and the bottom bar is AISI 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
23
Fatigue Strength, MPa 330
210
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
78
Shear Strength, MPa 440
300
Tensile Strength: Ultimate (UTS), MPa 710
470
Tensile Strength: Yield (Proof), MPa 540
310

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 450
580
Maximum Temperature: Mechanical, °C 1100
930
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 16
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.1
3.4
Embodied Energy, MJ/kg 44
47
Embodied Water, L/kg 170
130

Common Calculations

PREN (Pitting Resistance) 30
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
95
Resilience: Unit (Modulus of Resilience), kJ/m3 730
240
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
17
Strength to Weight: Bending, points 23
17
Thermal Diffusivity, mm2/s 4.3
6.2
Thermal Shock Resistance, points 19
16

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.025
Chromium (Cr), % 23 to 28
17.5 to 19.5
Iron (Fe), % 63.1 to 74
73.3 to 80.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 1.0 to 2.0
1.8 to 2.5
Nickel (Ni), % 2.0 to 5.0
0 to 1.0
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8