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AISI 440A Stainless Steel vs. AISI 347 Stainless Steel

Both AISI 440A stainless steel and AISI 347 stainless steel are iron alloys. They have 87% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 440A stainless steel and the bottom bar is AISI 347 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 5.0 to 20
34 to 46
Fatigue Strength, MPa 270 to 790
220 to 270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 450 to 1040
430 to 460
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
610 to 690
Tensile Strength: Yield (Proof), MPa 420 to 1650
240 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 400
480
Maximum Temperature: Mechanical, °C 760
870
Melting Completion (Liquidus), °C 1480
1430
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 23
16
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
19
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.2
3.6
Embodied Energy, MJ/kg 31
52
Embodied Water, L/kg 120
150

Common Calculations

PREN (Pitting Resistance) 18
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
190 to 220
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26 to 65
22 to 25
Strength to Weight: Bending, points 23 to 43
20 to 22
Thermal Diffusivity, mm2/s 6.2
4.3
Thermal Shock Resistance, points 26 to 65
13 to 15

Alloy Composition

Carbon (C), % 0.6 to 0.75
0 to 0.080
Chromium (Cr), % 16 to 18
17 to 19
Iron (Fe), % 78.4 to 83.4
64.1 to 74
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.75
0
Nickel (Ni), % 0
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 1.0
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030