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EN 1.4550 Stainless Steel vs. EN 1.4429 Stainless Steel

Both EN 1.4550 stainless steel and EN 1.4429 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a very high 95% 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 1.4429 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 42
40
Fatigue Strength, MPa 210
280
Impact Strength: V-Notched Charpy, J 90
93
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Shear Strength, MPa 430
470
Tensile Strength: Ultimate (UTS), MPa 620
690
Tensile Strength: Yield (Proof), MPa 230
320

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 480
410
Maximum Temperature: Mechanical, °C 940
960
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 18
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.6
4.0
Embodied Energy, MJ/kg 51
55
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 18
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
230
Resilience: Unit (Modulus of Resilience), kJ/m3 140
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
24
Strength to Weight: Bending, points 21
22
Thermal Diffusivity, mm2/s 4.0
4.0
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 17 to 19
16.5 to 18.5
Iron (Fe), % 64.9 to 74
61.2 to 69.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 9.0 to 12
11 to 14
Niobium (Nb), % 0 to 1.0
0
Nitrogen (N), % 0
0.12 to 0.22
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 0.015