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N08904 Stainless Steel vs. AISI 444 Stainless Steel

Both N08904 stainless steel and AISI 444 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 68% of their average alloy composition in common.

For each property being compared, the top bar is N08904 stainless steel and the bottom bar is AISI 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 38
23
Fatigue Strength, MPa 200
210
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 77
83
Shear Modulus, GPa 79
78
Shear Strength, MPa 370
300
Tensile Strength: Ultimate (UTS), MPa 540
470
Tensile Strength: Yield (Proof), MPa 240
310

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 430
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 470
480
Thermal Conductivity, W/m-K 12
23
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 32
15
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 5.8
3.4
Embodied Energy, MJ/kg 79
47
Embodied Water, L/kg 200
130

Common Calculations

PREN (Pitting Resistance) 37
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
95
Resilience: Unit (Modulus of Resilience), kJ/m3 150
240
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
17
Strength to Weight: Bending, points 18
17
Thermal Diffusivity, mm2/s 3.1
6.2
Thermal Shock Resistance, points 12
16

Alloy Composition

Carbon (C), % 0 to 0.020
0 to 0.025
Chromium (Cr), % 19 to 23
17.5 to 19.5
Copper (Cu), % 1.0 to 2.0
0
Iron (Fe), % 38.8 to 53
73.3 to 80.8
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 4.0 to 5.0
1.8 to 2.5
Nickel (Ni), % 23 to 28
0 to 1.0
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0 to 0.1
0 to 0.035
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8