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SAE-AISI 9255 Steel vs. EN 1.1121 Steel

Both SAE-AISI 9255 steel and EN 1.1121 steel are iron alloys. Both are furnished in the annealed condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is EN 1.1121 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
120
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
28
Fatigue Strength, MPa 270
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 430
260
Tensile Strength: Ultimate (UTS), MPa 680
400
Tensile Strength: Yield (Proof), MPa 390
210

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 46
53
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
1.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
18
Embodied Water, L/kg 46
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
93
Resilience: Unit (Modulus of Resilience), kJ/m3 400
110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
14
Strength to Weight: Bending, points 22
15
Thermal Diffusivity, mm2/s 13
14
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.070 to 0.13
Iron (Fe), % 96.2 to 97
98.8 to 99.63
Manganese (Mn), % 0.7 to 1.0
0.3 to 0.6
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 1.8 to 2.2
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.035