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EN 1.4911 Stainless Steel vs. EN 1.4521 Stainless Steel

Both EN 1.4911 stainless steel and EN 1.4521 stainless steel are iron alloys. They have a moderately high 90% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4911 stainless steel and the bottom bar is EN 1.4521 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
23
Fatigue Strength, MPa 530
230
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
78
Shear Strength, MPa 640
330
Tensile Strength: Ultimate (UTS), MPa 1070
520
Tensile Strength: Yield (Proof), MPa 970
340

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 430
500
Maximum Temperature: Mechanical, °C 700
930
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 20
23
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 20
12
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 3.4
2.8
Embodied Energy, MJ/kg 49
39
Embodied Water, L/kg 130
130

Common Calculations

PREN (Pitting Resistance) 14
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
100
Resilience: Unit (Modulus of Resilience), kJ/m3 2410
280
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 30
19
Thermal Diffusivity, mm2/s 5.4
6.2
Thermal Shock Resistance, points 37
18

Alloy Composition

Boron (B), % 0.0050 to 0.015
0
Carbon (C), % 0.050 to 0.12
0 to 0.025
Chromium (Cr), % 9.8 to 11.2
17 to 20
Cobalt (Co), % 5.0 to 7.0
0
Iron (Fe), % 75.7 to 83.8
74.6 to 81.1
Manganese (Mn), % 0.3 to 1.3
0 to 1.0
Molybdenum (Mo), % 0.5 to 1.0
1.8 to 2.5
Nickel (Ni), % 0.2 to 1.2
0
Niobium (Nb), % 0.2 to 0.5
0
Nitrogen (N), % 0 to 0.035
0 to 0.030
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0.1 to 0.8
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Titanium (Ti), % 0
0.15 to 0.8
Tungsten (W), % 0 to 0.7
0
Vanadium (V), % 0.1 to 0.4
0