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EN 1.4818 Stainless Steel vs. EN 1.4438 Stainless Steel

Both EN 1.4818 stainless steel and EN 1.4438 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 33 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.4818 stainless steel and the bottom bar is EN 1.4438 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
41
Fatigue Strength, MPa 280
220
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Shear Strength, MPa 480
420
Tensile Strength: Ultimate (UTS), MPa 700
620
Tensile Strength: Yield (Proof), MPa 330
250

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1050
1000
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 17
14
Thermal Expansion, µm/m-K 17
16

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 16
22
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.1
4.4
Embodied Energy, MJ/kg 44
60
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 22
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
200
Resilience: Unit (Modulus of Resilience), kJ/m3 270
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
22
Strength to Weight: Bending, points 23
20
Thermal Diffusivity, mm2/s 4.5
3.7
Thermal Shock Resistance, points 15
14

Alloy Composition

Carbon (C), % 0.040 to 0.080
0 to 0.030
Cerium (Ce), % 0.030 to 0.080
0
Chromium (Cr), % 18 to 20
17.5 to 19.5
Iron (Fe), % 65.6 to 71.8
57.3 to 66.5
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 9.0 to 11
13 to 16
Nitrogen (N), % 0.12 to 0.2
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 1.0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015