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S21904 Stainless Steel vs. EN 1.4509 Stainless Steel

Both S21904 stainless steel and EN 1.4509 stainless steel are iron alloys. They have 82% 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 1.4509 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
21
Fatigue Strength, MPa 380 to 550
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Shear Strength, MPa 510 to 620
330
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
530
Tensile Strength: Yield (Proof), MPa 390 to 910
260

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 430
570
Maximum Temperature: Mechanical, °C 980
890
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
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
13
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.0
2.8
Embodied Energy, MJ/kg 43
41
Embodied Water, L/kg 160
120

Common Calculations

PREN (Pitting Resistance) 25
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
90
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
19
Strength to Weight: Bending, points 23 to 29
19
Thermal Diffusivity, mm2/s 3.8
6.8
Thermal Shock Resistance, points 15 to 21
19

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.030
Chromium (Cr), % 19 to 21.5
17.5 to 18.5
Iron (Fe), % 59.5 to 67.4
77.8 to 82.1
Manganese (Mn), % 8.0 to 10
0 to 1.0
Nickel (Ni), % 5.5 to 7.5
0
Niobium (Nb), % 0
0.3 to 1.0
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 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6