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SAE-AISI 50B44 Steel vs. SAE-AISI 4028 Steel

Both SAE-AISI 50B44 steel and SAE-AISI 4028 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 50B44 steel and the bottom bar is SAE-AISI 4028 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
150 to 190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22
14 to 23
Fatigue Strength, MPa 250
180 to 330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 360
310 to 380
Tensile Strength: Ultimate (UTS), MPa 570
490 to 630
Tensile Strength: Yield (Proof), MPa 360
260 to 520

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
49
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
2.1
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 48
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
81 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 350
180 to 720
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
17 to 22
Strength to Weight: Bending, points 20
18 to 21
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 17
16 to 20

Alloy Composition

Boron (B), % 0.00050 to 0.0030
0
Carbon (C), % 0.43 to 0.48
0.25 to 0.3
Chromium (Cr), % 0.2 to 0.6
0
Iron (Fe), % 97.5 to 98.5
98.1 to 98.7
Manganese (Mn), % 0.75 to 1.0
0.7 to 0.9
Molybdenum (Mo), % 0
0.2 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0.035 to 0.050