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EN 1.4449 Stainless Steel vs. EN 1.4311 Stainless Steel

Both EN 1.4449 stainless steel and EN 1.4311 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 1.4449 stainless steel and the bottom bar is EN 1.4311 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
200
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 48
43
Fatigue Strength, MPa 240
270
Impact Strength: V-Notched Charpy, J 91
93
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Shear Strength, MPa 440
450
Tensile Strength: Ultimate (UTS), MPa 620
650
Tensile Strength: Yield (Proof), MPa 250
310

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 960
950
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 19
16
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.9
3.1
Embodied Energy, MJ/kg 54
43
Embodied Water, L/kg 150
140

Common Calculations

PREN (Pitting Resistance) 27
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
230
Resilience: Unit (Modulus of Resilience), kJ/m3 160
240
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 20
21
Thermal Diffusivity, mm2/s 4.0
4.0
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.030
Chromium (Cr), % 17 to 18.2
17.5 to 19.5
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 62.4 to 69.3
65.7 to 73.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.3 to 2.8
0
Nickel (Ni), % 11.5 to 12.5
8.5 to 11.5
Nitrogen (N), % 0 to 0.080
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