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S21904 Stainless Steel vs. EN 1.8509 Steel

Both S21904 stainless steel and EN 1.8509 steel are iron alloys. They have 66% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is EN 1.8509 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
340
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17 to 51
11
Fatigue Strength, MPa 380 to 550
580
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 510 to 620
680
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
1130
Tensile Strength: Yield (Proof), MPa 390 to 910
940

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 980
440
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
39
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
1.6
Embodied Energy, MJ/kg 43
22
Embodied Water, L/kg 160
65

Common Calculations

PREN (Pitting Resistance) 25
2.6
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
120
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
2340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
40
Strength to Weight: Bending, points 23 to 29
31
Thermal Diffusivity, mm2/s 3.8
10
Thermal Shock Resistance, points 15 to 21
33

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0 to 0.040
0.38 to 0.45
Chromium (Cr), % 19 to 21.5
1.5 to 1.8
Iron (Fe), % 59.5 to 67.4
95.5 to 97.1
Manganese (Mn), % 8.0 to 10
0.4 to 0.7
Molybdenum (Mo), % 0
0.2 to 0.35
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.035