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EN 1.4424 Stainless Steel vs. EN 1.4449 Stainless Steel

Both EN 1.4424 stainless steel and EN 1.4449 stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4424 stainless steel and the bottom bar is EN 1.4449 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
48
Fatigue Strength, MPa 350 to 370
240
Impact Strength: V-Notched Charpy, J 90 to 91
91
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
78
Shear Strength, MPa 520
440
Tensile Strength: Ultimate (UTS), MPa 800
620
Tensile Strength: Yield (Proof), MPa 480 to 500
250

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 960
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 13
15
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 15
19
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.4
3.9
Embodied Energy, MJ/kg 46
54
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 29
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 200
240
Resilience: Unit (Modulus of Resilience), kJ/m3 580 to 640
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29
22
Strength to Weight: Bending, points 25
20
Thermal Diffusivity, mm2/s 3.5
4.0
Thermal Shock Resistance, points 23
14

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.035
Chromium (Cr), % 18 to 19
17 to 18.2
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 68.6 to 72.4
62.4 to 69.3
Manganese (Mn), % 1.2 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.0
2.3 to 2.8
Nickel (Ni), % 4.5 to 5.2
11.5 to 12.5
Nitrogen (N), % 0.050 to 0.1
0 to 0.080
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 1.4 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015