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Annealed AISI 304LN vs. Annealed SAE-AISI A9

Both annealed AISI 304LN and annealed SAE-AISI A9 are iron alloys. Both are furnished in the annealed condition. They have 77% of their average alloy composition in common. There are 31 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 annealed AISI 304LN and the bottom bar is annealed SAE-AISI A9.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 42
21
Fatigue Strength, MPa 200
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74
Shear Strength, MPa 400
480
Tensile Strength: Ultimate (UTS), MPa 580
770
Tensile Strength: Yield (Proof), MPa 230
360

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
35
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 16
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.1
4.7
Embodied Energy, MJ/kg 44
70
Embodied Water, L/kg 150
82

Common Calculations

PREN (Pitting Resistance) 21
10
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
130
Resilience: Unit (Modulus of Resilience), kJ/m3 140
350
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
28
Strength to Weight: Bending, points 20
24
Thermal Diffusivity, mm2/s 4.0
9.6
Thermal Shock Resistance, points 13
25

Alloy Composition

Carbon (C), % 0 to 0.030
0.45 to 0.55
Chromium (Cr), % 18 to 20
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 65 to 73.9
87 to 90.5
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0
1.3 to 1.8
Nickel (Ni), % 8.0 to 12
1.3 to 1.8
Nitrogen (N), % 0.1 to 0.16
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 0.75
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.8 to 1.4