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AISI 304 Stainless Steel vs. AISI 303 Stainless Steel

Both AISI 304 stainless steel and AISI 303 stainless steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is AISI 304 stainless steel and the bottom bar is AISI 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 360
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 8.0 to 43
40 to 51
Fatigue Strength, MPa 210 to 440
230 to 360
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 400 to 690
430 to 470
Tensile Strength: Ultimate (UTS), MPa 580 to 1180
600 to 690
Tensile Strength: Yield (Proof), MPa 230 to 860
230 to 420

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 710
930
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
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Calomel Potential, mV -80
-80
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.0
Embodied Energy, MJ/kg 43
42
Embodied Water, L/kg 150
140

Common Calculations

PREN (Pitting Resistance) 20
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 250
240
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1870
140 to 440
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 42
21 to 25
Strength to Weight: Bending, points 20 to 32
20 to 22
Thermal Diffusivity, mm2/s 4.2
4.4
Thermal Shock Resistance, points 12 to 25
13 to 15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.15
Chromium (Cr), % 18 to 20
17 to 19
Iron (Fe), % 66.5 to 74
67.3 to 74.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 8.0 to 10.5
8.0 to 10
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.2
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0.15 to 0.35

Comparable Variants