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AISI 403 Stainless Steel vs. AISI 348 Stainless Steel

Both AISI 403 stainless steel and AISI 348 stainless steel are iron alloys. They have 82% of their average alloy composition in common.

For each property being compared, the top bar is AISI 403 stainless steel and the bottom bar is AISI 348 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 240
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16 to 25
41
Fatigue Strength, MPa 200 to 340
200
Poisson's Ratio 0.28
0.28
Reduction in Area, % 47 to 50
53
Rockwell B Hardness 83
81
Shear Modulus, GPa 76
77
Shear Strength, MPa 340 to 480
400
Tensile Strength: Ultimate (UTS), MPa 530 to 780
580
Tensile Strength: Yield (Proof), MPa 280 to 570
230

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 390
480
Maximum Temperature: Mechanical, °C 740
940
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 28
16
Thermal Expansion, µm/m-K 9.9
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.7
Embodied Energy, MJ/kg 27
54
Embodied Water, L/kg 99
150

Common Calculations

PREN (Pitting Resistance) 12
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
190
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 840
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19 to 28
21
Strength to Weight: Bending, points 19 to 24
20
Thermal Diffusivity, mm2/s 7.6
4.2
Thermal Shock Resistance, points 20 to 29
13

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 11.5 to 13
17 to 19
Cobalt (Co), % 0
0 to 0.2
Iron (Fe), % 84.7 to 88.5
63.8 to 74
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 0 to 0.6
9.0 to 13
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0 to 0.1