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Hot Rolled SAE-AISI 1090 vs. Hot Rolled SAE-AISI 1151

Both hot rolled SAE-AISI 1090 and hot rolled SAE-AISI 1151 are iron alloys. Both are furnished in the hot worked condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is hot rolled SAE-AISI 1090 and the bottom bar is hot rolled SAE-AISI 1151.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
17
Fatigue Strength, MPa 320
260
Poisson's Ratio 0.29
0.29
Reduction in Area, % 28
40
Shear Modulus, GPa 72
72
Shear Strength, MPa 570
430
Tensile Strength: Ultimate (UTS), MPa 950
710
Tensile Strength: Yield (Proof), MPa 520
390

Thermal Properties

Latent Heat of Fusion, J/g 240
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
51
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
12

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
18
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91
100
Resilience: Unit (Modulus of Resilience), kJ/m3 730
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34
25
Strength to Weight: Bending, points 27
22
Thermal Diffusivity, mm2/s 13
14
Thermal Shock Resistance, points 31
22

Alloy Composition

Carbon (C), % 0.85 to 1.0
0.48 to 0.55
Iron (Fe), % 98 to 98.6
98.3 to 98.7
Manganese (Mn), % 0.6 to 0.9
0.7 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Sulfur (S), % 0 to 0.050
0.080 to 0.13