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S21904 Stainless Steel vs. EN 1.4640 Stainless Steel

Both S21904 stainless steel and EN 1.4640 stainless steel are iron alloys. They have a moderately high 91% 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 1.4640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
190 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
51
Fatigue Strength, MPa 380 to 550
230 to 250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Shear Strength, MPa 510 to 620
440 to 460
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
620 to 650
Tensile Strength: Yield (Proof), MPa 390 to 910
240 to 260

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 430
420
Maximum Temperature: Mechanical, °C 980
930
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1350
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 15
14
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
2.8
Embodied Energy, MJ/kg 43
40
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 25
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
250 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
150 to 170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
22 to 23
Strength to Weight: Bending, points 23 to 29
21
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 15 to 21
14 to 15

Alloy Composition

Carbon (C), % 0 to 0.040
0.030 to 0.080
Chromium (Cr), % 19 to 21.5
18 to 19
Copper (Cu), % 0
1.3 to 2.0
Iron (Fe), % 59.5 to 67.4
67.4 to 73.6
Manganese (Mn), % 8.0 to 10
1.5 to 4.0
Nickel (Ni), % 5.5 to 7.5
5.5 to 6.9
Nitrogen (N), % 0.15 to 0.4
0.030 to 0.11
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015