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EN 1.4318 Stainless Steel vs. EN 1.4508 Stainless Steel

Both EN 1.4318 stainless steel and EN 1.4508 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a moderately high 91% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.4318 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, % 44
34
Fatigue Strength, MPa 340
210
Impact Strength: V-Notched Charpy, J 85
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 740
570
Tensile Strength: Yield (Proof), MPa 380
260

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 910
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 16
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 13
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.8
4.0
Embodied Energy, MJ/kg 39
55
Embodied Water, L/kg 130
160

Common Calculations

PREN (Pitting Resistance) 20
32
Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
160
Resilience: Unit (Modulus of Resilience), kJ/m3 360
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27
20
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 4.0
4.1
Thermal Shock Resistance, points 17
17

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 16.5 to 18.5
18 to 20
Iron (Fe), % 70.2 to 77.4
61.2 to 69.9
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0
3.0 to 3.5
Nickel (Ni), % 6.0 to 8.0
9.0 to 12
Nitrogen (N), % 0.1 to 0.2
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 0.015
0 to 0.030