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EN 1.4550 Stainless Steel vs. EN 1.4659 Stainless Steel

Both EN 1.4550 stainless steel and EN 1.4659 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 71% 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 1.4659 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
260
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 42
49
Fatigue Strength, MPa 210
460
Impact Strength: V-Notched Charpy, J 90
94
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
81
Shear Strength, MPa 430
640
Tensile Strength: Ultimate (UTS), MPa 620
900
Tensile Strength: Yield (Proof), MPa 230
480

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 480
440
Maximum Temperature: Mechanical, °C 940
1100
Melting Completion (Liquidus), °C 1430
1480
Melting Onset (Solidus), °C 1390
1430
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 18
37
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 3.6
6.5
Embodied Energy, MJ/kg 51
89
Embodied Water, L/kg 140
220

Common Calculations

PREN (Pitting Resistance) 18
54
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
370
Resilience: Unit (Modulus of Resilience), kJ/m3 140
550
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
31
Strength to Weight: Bending, points 21
25
Thermal Diffusivity, mm2/s 4.0
3.2
Thermal Shock Resistance, points 14
19

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.020
Chromium (Cr), % 17 to 19
23 to 25
Copper (Cu), % 0
1.0 to 2.0
Iron (Fe), % 64.9 to 74
35.7 to 45.7
Manganese (Mn), % 0 to 2.0
2.0 to 4.0
Molybdenum (Mo), % 0
5.5 to 6.5
Nickel (Ni), % 9.0 to 12
21 to 23
Niobium (Nb), % 0 to 1.0
0
Nitrogen (N), % 0
0.35 to 0.5
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0 to 0.015
0 to 0.010
Tungsten (W), % 0
1.5 to 2.5