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EN 1.4581 Stainless Steel vs. EN 1.4557 Stainless Steel

Both EN 1.4581 stainless steel and EN 1.4557 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 86% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4581 stainless steel and the bottom bar is EN 1.4557 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
40
Fatigue Strength, MPa 150
260
Impact Strength: V-Notched Charpy, J 45
56
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
80
Tensile Strength: Ultimate (UTS), MPa 510
560
Tensile Strength: Yield (Proof), MPa 210
300

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 490
420
Maximum Temperature: Mechanical, °C 990
1090
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 21
29
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 4.2
5.6
Embodied Energy, MJ/kg 59
76
Embodied Water, L/kg 160
190

Common Calculations

PREN (Pitting Resistance) 26
45
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190
Resilience: Unit (Modulus of Resilience), kJ/m3 110
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
19
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 3.9
4.0
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.020
Chromium (Cr), % 18 to 20
19.5 to 20.5
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 61.4 to 71
49.5 to 56.3
Manganese (Mn), % 0 to 1.5
0 to 1.2
Molybdenum (Mo), % 2.0 to 2.5
6.0 to 7.0
Nickel (Ni), % 9.0 to 12
17.5 to 19.5
Niobium (Nb), % 0 to 1.0
0
Nitrogen (N), % 0
0.18 to 0.24
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010