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EN 1.4618 Stainless Steel vs. EN 1.4318 Stainless Steel

Both EN 1.4618 stainless steel and EN 1.4318 stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4618 stainless steel and the bottom bar is EN 1.4318 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 210
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 51
44
Fatigue Strength, MPa 240 to 250
340
Impact Strength: V-Notched Charpy, J 90 to 91
85
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 480 to 500
520
Tensile Strength: Ultimate (UTS), MPa 680 to 700
740
Tensile Strength: Yield (Proof), MPa 250 to 260
380

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 410
410
Maximum Temperature: Mechanical, °C 900
910
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1360
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 13
13
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.7
2.8
Embodied Energy, MJ/kg 39
39
Embodied Water, L/kg 150
130

Common Calculations

PREN (Pitting Resistance) 19
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 270 to 280
280
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 170
360
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 25
27
Strength to Weight: Bending, points 22 to 23
23
Thermal Diffusivity, mm2/s 4.0
4.0
Thermal Shock Resistance, points 15 to 16
17

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 16.5 to 18.5
16.5 to 18.5
Copper (Cu), % 1.0 to 2.5
0
Iron (Fe), % 62.7 to 72.5
70.2 to 77.4
Manganese (Mn), % 5.5 to 9.5
0 to 2.0
Nickel (Ni), % 4.5 to 5.5
6.0 to 8.0
Nitrogen (N), % 0 to 0.15
0.1 to 0.2
Phosphorus (P), % 0 to 0.070
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.015