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AISI 347 Stainless Steel vs. AISI 303 Stainless Steel

Both AISI 347 stainless steel and AISI 303 stainless steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is AISI 347 stainless steel and the bottom bar is AISI 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 210
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34 to 46
40 to 51
Fatigue Strength, MPa 220 to 270
230 to 360
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 430 to 460
430 to 470
Tensile Strength: Ultimate (UTS), MPa 610 to 690
600 to 690
Tensile Strength: Yield (Proof), MPa 240 to 350
230 to 420

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 480
410
Maximum Temperature: Mechanical, °C 870
930
Melting Completion (Liquidus), °C 1430
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 19
15
Calomel Potential, mV -80
-80
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
3.0
Embodied Energy, MJ/kg 52
42
Embodied Water, L/kg 150
140

Common Calculations

PREN (Pitting Resistance) 18
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 220
240
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 310
140 to 440
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22 to 25
21 to 25
Strength to Weight: Bending, points 20 to 22
20 to 22
Thermal Diffusivity, mm2/s 4.3
4.4
Thermal Shock Resistance, points 13 to 15
13 to 15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.15
Chromium (Cr), % 17 to 19
17 to 19
Iron (Fe), % 64.1 to 74
67.3 to 74.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 9.0 to 13
8.0 to 10
Niobium (Nb), % 0 to 1.0
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