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SAE-AISI 1049 Steel vs. SAE-AISI 50B50 Steel

Both SAE-AISI 1049 steel and SAE-AISI 50B50 steel are iron alloys. Their average alloy composition is basically identical. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1049 steel and the bottom bar is SAE-AISI 50B50 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 220
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
22
Fatigue Strength, MPa 250 to 400
260
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 420 to 450
370
Tensile Strength: Ultimate (UTS), MPa 680 to 750
590
Tensile Strength: Yield (Proof), MPa 370 to 640
370

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
45
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
19
Embodied Water, L/kg 46
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 75 to 99
110
Resilience: Unit (Modulus of Resilience), kJ/m3 370 to 1090
370
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 27
21
Strength to Weight: Bending, points 22 to 23
20
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 22 to 24
17

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.46 to 0.53
0.48 to 0.53
Chromium (Cr), % 0
0.4 to 0.6
Iron (Fe), % 98.5 to 98.9
97.4 to 98.2
Manganese (Mn), % 0.6 to 0.9
0.75 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.040