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EN 1.4508 Stainless Steel vs. EN 1.4421 Stainless Steel

Both EN 1.4508 stainless steel and EN 1.4421 stainless steel are iron alloys. They have 88% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4508 stainless steel and the bottom bar is EN 1.4421 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
11 to 17
Fatigue Strength, MPa 210
380 to 520
Impact Strength: V-Notched Charpy, J 90
30 to 67
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
77
Tensile Strength: Ultimate (UTS), MPa 570
880 to 1100
Tensile Strength: Yield (Proof), MPa 260
620 to 950

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 1000
870
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 20
12
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.0
2.6
Embodied Energy, MJ/kg 55
36
Embodied Water, L/kg 160
130

Common Calculations

PREN (Pitting Resistance) 32
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
120 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 170
960 to 2270
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 20
31 to 39
Strength to Weight: Bending, points 19
26 to 30
Thermal Diffusivity, mm2/s 4.1
4.4
Thermal Shock Resistance, points 17
31 to 39

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.060
Chromium (Cr), % 18 to 20
15.5 to 17.5
Iron (Fe), % 61.2 to 69.9
74.4 to 80.5
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 3.0 to 3.5
0 to 0.7
Nickel (Ni), % 9.0 to 12
4.0 to 5.5
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.5
0 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.020