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S21904 Stainless Steel vs. EN 1.4981 Stainless Steel

Both S21904 stainless steel and EN 1.4981 stainless steel are iron alloys. They have 87% 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 1.4981 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
39
Fatigue Strength, MPa 380 to 550
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Shear Strength, MPa 510 to 620
420
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
610
Tensile Strength: Yield (Proof), MPa 390 to 910
240

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 430
520
Maximum Temperature: Mechanical, °C 980
940
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
16
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
25
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.0
4.8
Embodied Energy, MJ/kg 43
67
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 25
22
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
190
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 36
21
Strength to Weight: Bending, points 23 to 29
20
Thermal Diffusivity, mm2/s 3.8
4.3
Thermal Shock Resistance, points 15 to 21
14

Alloy Composition

Carbon (C), % 0 to 0.040
0.040 to 0.1
Chromium (Cr), % 19 to 21.5
15.5 to 17.5
Iron (Fe), % 59.5 to 67.4
59.6 to 66.7
Manganese (Mn), % 8.0 to 10
0 to 1.5
Molybdenum (Mo), % 0
1.6 to 2.0
Nickel (Ni), % 5.5 to 7.5
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 1.0
0.3 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.015