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EN 1.4347 Stainless Steel vs. EN 1.4550 Stainless Steel

Both EN 1.4347 stainless steel and EN 1.4550 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a moderately high 92% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.4347 stainless steel and the bottom bar is EN 1.4550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
42
Fatigue Strength, MPa 320
210
Impact Strength: V-Notched Charpy, J 34
90
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
77
Tensile Strength: Ultimate (UTS), MPa 660
620
Tensile Strength: Yield (Proof), MPa 480
230

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 450
480
Maximum Temperature: Mechanical, °C 1100
940
Melting Completion (Liquidus), °C 1410
1430
Melting Onset (Solidus), °C 1370
1390
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 16
18
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
3.6
Embodied Energy, MJ/kg 44
51
Embodied Water, L/kg 170
140

Common Calculations

PREN (Pitting Resistance) 28
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
210
Resilience: Unit (Modulus of Resilience), kJ/m3 570
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
22
Strength to Weight: Bending, points 22
21
Thermal Diffusivity, mm2/s 4.0
4.0
Thermal Shock Resistance, points 19
14

Alloy Composition

Carbon (C), % 0 to 0.050
0 to 0.080
Chromium (Cr), % 25 to 27
17 to 19
Iron (Fe), % 62.2 to 69.4
64.9 to 74
Manganese (Mn), % 0 to 1.5
0 to 2.0
Nickel (Ni), % 5.5 to 7.5
9.0 to 12
Niobium (Nb), % 0
0 to 1.0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.015