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S21904 Stainless Steel vs. EN 1.4109 Stainless Steel

Both S21904 stainless steel and EN 1.4109 stainless steel are iron alloys. They have 79% of their average alloy composition in common.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is EN 1.4109 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
19
Fatigue Strength, MPa 380 to 550
270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
76
Shear Strength, MPa 510 to 620
480
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
770
Tensile Strength: Yield (Proof), MPa 390 to 910
420

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 430
390
Maximum Temperature: Mechanical, °C 980
820
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
30
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 15
8.5
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.0
2.2
Embodied Energy, MJ/kg 43
30
Embodied Water, L/kg 160
110

Common Calculations

PREN (Pitting Resistance) 25
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
120
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
460
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
28
Strength to Weight: Bending, points 23 to 29
24
Thermal Diffusivity, mm2/s 3.8
8.1
Thermal Shock Resistance, points 15 to 21
28

Alloy Composition

Carbon (C), % 0 to 0.040
0.6 to 0.75
Chromium (Cr), % 19 to 21.5
14 to 16
Iron (Fe), % 59.5 to 67.4
80.7 to 85
Manganese (Mn), % 8.0 to 10
0 to 1.0
Molybdenum (Mo), % 0
0.4 to 0.8
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0 to 0.030
0 to 0.015