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EN 1.4818 Stainless Steel vs. S21904 Stainless Steel

Both EN 1.4818 stainless steel and S21904 stainless steel are iron alloys. They have a moderately high 90% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4818 stainless steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
17 to 51
Fatigue Strength, MPa 280
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Shear Strength, MPa 480
510 to 620
Tensile Strength: Ultimate (UTS), MPa 700
700 to 1000
Tensile Strength: Yield (Proof), MPa 330
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 1050
980
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1370
1350
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 17
14
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 16
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.1
3.0
Embodied Energy, MJ/kg 44
43
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 22
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 270
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
25 to 36
Strength to Weight: Bending, points 23
23 to 29
Thermal Diffusivity, mm2/s 4.5
3.8
Thermal Shock Resistance, points 15
15 to 21

Alloy Composition

Carbon (C), % 0.040 to 0.080
0 to 0.040
Cerium (Ce), % 0.030 to 0.080
0
Chromium (Cr), % 18 to 20
19 to 21.5
Iron (Fe), % 65.6 to 71.8
59.5 to 67.4
Manganese (Mn), % 0 to 1.0
8.0 to 10
Nickel (Ni), % 9.0 to 11
5.5 to 7.5
Nitrogen (N), % 0.12 to 0.2
0.15 to 0.4
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 0.030