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EN 1.4640 Stainless Steel vs. S21900 Stainless Steel

Both EN 1.4640 stainless steel and S21900 stainless steel are iron alloys. 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 1.4640 stainless steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 200
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 51
50
Fatigue Strength, MPa 230 to 250
380
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Shear Strength, MPa 440 to 460
510
Tensile Strength: Ultimate (UTS), MPa 620 to 650
710
Tensile Strength: Yield (Proof), MPa 240 to 260
390

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 20
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
300
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 170
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22 to 23
26
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 4.0
3.8
Thermal Shock Resistance, points 14 to 15
15

Alloy Composition

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