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EN 1.1121 Steel vs. EN 1.4550 Stainless Steel

Both EN 1.1121 steel and EN 1.4550 stainless steel are iron alloys. They have 70% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.1121 steel and the bottom bar is EN 1.4550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
200
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 28
42
Fatigue Strength, MPa 160
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 260
430
Tensile Strength: Ultimate (UTS), MPa 400
620
Tensile Strength: Yield (Proof), MPa 210
230

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
940
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 53
15
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
18
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.6
Embodied Energy, MJ/kg 18
51
Embodied Water, L/kg 45
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 93
210
Resilience: Unit (Modulus of Resilience), kJ/m3 110
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 14
22
Strength to Weight: Bending, points 15
21
Thermal Diffusivity, mm2/s 14
4.0
Thermal Shock Resistance, points 13
14

Alloy Composition

Carbon (C), % 0.070 to 0.13
0 to 0.080
Chromium (Cr), % 0
17 to 19
Iron (Fe), % 98.8 to 99.63
64.9 to 74
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Nickel (Ni), % 0
9.0 to 12
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.015