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EN 1.4550 Stainless Steel vs. EN 1.4325 Stainless Steel

Both EN 1.4550 stainless steel and EN 1.4325 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4550 stainless steel and the bottom bar is EN 1.4325 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 42
45
Fatigue Strength, MPa 210
190
Impact Strength: V-Notched Charpy, J 90
91
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 430
450
Tensile Strength: Ultimate (UTS), MPa 620
650
Tensile Strength: Yield (Proof), MPa 230
210

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 480
410
Maximum Temperature: Mechanical, °C 940
930
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 16
16

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 18
15
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
3.0
Embodied Energy, MJ/kg 51
42
Embodied Water, L/kg 140
140

Common Calculations

PREN (Pitting Resistance) 18
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
230
Resilience: Unit (Modulus of Resilience), kJ/m3 140
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
23
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 4.0
4.3
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0 to 0.080
0.030 to 0.15
Chromium (Cr), % 17 to 19
17 to 19
Iron (Fe), % 64.9 to 74
67.8 to 75
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 9.0 to 12
8.0 to 10
Niobium (Nb), % 0 to 1.0
0
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030