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EN 1.3955 Stainless Steel vs. EN 1.4508 Stainless Steel

Both EN 1.3955 stainless steel and EN 1.4508 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 1.3955 stainless steel and the bottom bar is EN 1.4508 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
34
Fatigue Strength, MPa 150
210
Impact Strength: V-Notched Charpy, J 90
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 520
570
Tensile Strength: Yield (Proof), MPa 220
260

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 930
1000
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1380
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 16
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.2
4.0
Embodied Energy, MJ/kg 45
55
Embodied Water, L/kg 140
160

Common Calculations

PREN (Pitting Resistance) 19
32
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
160
Resilience: Unit (Modulus of Resilience), kJ/m3 130
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
20
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 4.1
4.1
Thermal Shock Resistance, points 15
17

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 16.5 to 18.5
18 to 20
Iron (Fe), % 65.5 to 73.5
61.2 to 69.9
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0 to 0.75
3.0 to 3.5
Nickel (Ni), % 10 to 12
9.0 to 12
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030