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EN 1.1121 Steel vs. S21603 Stainless Steel

Both EN 1.1121 steel and S21603 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 63% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.1121 steel and the bottom bar is S21603 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
200
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 28
45
Fatigue Strength, MPa 160
360
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Shear Strength, MPa 260
490
Tensile Strength: Ultimate (UTS), MPa 400
690
Tensile Strength: Yield (Proof), MPa 210
390

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
990
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
3.6
Embodied Energy, MJ/kg 18
50
Embodied Water, L/kg 45
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 93
270
Resilience: Unit (Modulus of Resilience), kJ/m3 110
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 14
25
Strength to Weight: Bending, points 15
22
Thermal Shock Resistance, points 13
15

Alloy Composition

Carbon (C), % 0.070 to 0.13
0 to 0.030
Chromium (Cr), % 0
17.5 to 22
Iron (Fe), % 98.8 to 99.63
57.6 to 67.8
Manganese (Mn), % 0.3 to 0.6
7.5 to 9.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0 to 0.4
0 to 0.75
Sulfur (S), % 0 to 0.035
0 to 0.030