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Annealed AISI 304 vs. Annealed AISI 304L

Both annealed AISI 304 and annealed AISI 304L are iron alloys. Both are furnished in the annealed condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is annealed AISI 304 and the bottom bar is annealed AISI 304L.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 43
42
Fatigue Strength, MPa 210
170
Poisson's Ratio 0.28
0.28
Reduction in Area, % 53
53
Rockwell B Hardness 79
79
Shear Modulus, GPa 77
77
Shear Strength, MPa 400
370
Tensile Strength: Ultimate (UTS), MPa 580
540
Tensile Strength: Yield (Proof), MPa 230
190

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 710
540
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 17
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 15
16
Calomel Potential, mV -80
-80
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.1
Embodied Energy, MJ/kg 43
44
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 20
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
180
Resilience: Unit (Modulus of Resilience), kJ/m3 140
94
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
19
Strength to Weight: Bending, points 20
19
Thermal Diffusivity, mm2/s 4.2
4.2
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 18 to 20
18 to 20
Iron (Fe), % 66.5 to 74
65 to 74
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 8.0 to 10.5
8.0 to 12
Nitrogen (N), % 0 to 0.1
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030