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EN 1.4547 Stainless Steel vs. EN 1.4318 Stainless Steel

Both EN 1.4547 stainless steel and EN 1.4318 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 79% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4547 stainless steel and the bottom bar is EN 1.4318 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
44
Fatigue Strength, MPa 290
340
Impact Strength: V-Notched Charpy, J 90
85
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 80
77
Shear Strength, MPa 510
520
Tensile Strength: Ultimate (UTS), MPa 750
740
Tensile Strength: Yield (Proof), MPa 340
380

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 1090
910
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 28
13
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.6
2.8
Embodied Energy, MJ/kg 75
39
Embodied Water, L/kg 190
130

Common Calculations

PREN (Pitting Resistance) 45
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
280
Resilience: Unit (Modulus of Resilience), kJ/m3 290
360
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26
27
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 16
17

Alloy Composition

Carbon (C), % 0 to 0.020
0 to 0.030
Chromium (Cr), % 19.5 to 20.5
16.5 to 18.5
Copper (Cu), % 0.5 to 1.0
0
Iron (Fe), % 51 to 56.3
70.2 to 77.4
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 6.0 to 7.0
0
Nickel (Ni), % 17.5 to 18.5
6.0 to 8.0
Nitrogen (N), % 0.18 to 0.25
0.1 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0 to 0.7
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.015