5251 Aerospace Grade Aluminum Forgings
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5251 Aerospace Grade Aluminum Forgings

Why Chalco 5251 aluminum forgings?

Quality could meet aviation standard

BS 5L44 Alloy 5251 Forging Stock and Forgings.

We meet international aviation quality certification standards


OHSAS 18001


ISO 9001




aerospace certification

Chalco is a manufacturer with advanced technology and R&D capabilities in the field of aerospace materials, committed to common development with customers.

Specification of 5251 aluminum forgings

Forging Types Max Weight Max Measurement
Open Die Forge cube ≤5T Length≤7000mm;
disc ≤5T diameter≤2500mm
ring ≤5T Outer diameter of quenching parts≤2500mm;
outer diameter of non-quenching parts≤4000mm;
cylinder ≤5T Out diameter 200 to 800mm;
outer diameter 801 to 2000mm;
axle ≤8T length≤7000mm,
Closed Die Forge PVA≤3.0 (Diameter≤1950mm)
Complicated closed die forge parts PVA≤1.5㎡\(Diameter≤1400mm)

Chemical composition of 5251 aviation aluminum forgings

Element Composition %
Aluminum (Al) 97.0-99.0
Magnesium (Mg) 2.2-2.8
Manganese (Mn) 0.10 max
Chromium (Cr) 0.15 max
Copper (Cu) 0.10 max
Iron (Fe) 0.40 max
Tin (Sn) 0.15 max
Silicon (Si) 0.25 max
Titanium (Ti) 0.15 max
Zirconium (Zr) 0.10 max
Boron (B) 0.05 max
Individual impurities total 0.05 max
Total impurities 0.15 max

Typical material properties for 5251 aluminium forgings

Mechanical Properties Minimum Value Test Method
Yield strength (Rp0.2) 110 MPa BS EN 10002-1 or BS EN 2004-1.2
Tensile strength (Rm) 160 MPa BS EN 10002-1 or BS EN 2004-1.2
Elongation (A) 8% BS EN 10002-1 or BS EN 2004-1.2
Reduction of area (Z) 10% BS EN 10002-1 or BS EN 2004-1.2

Geometric dimensions and appearance of 5251 aluminum forgings

Dimensional Tolerances Forgings and Forging Stock
Diameter or Least Distance Between Parallel Surfaces +2%/-0%
Length or Width +2%/-0%
Thickness +3.5%/-0%
Twist 3mm max per meter length
Warpage 1.5% max of the length, width or thickness
Straightness 1.5mm max deviation per meter length
Surface Finish Smooth and free from cracks, tears, laps, and other defects that impair the use of the material
Workmanlike Finish Forgings shall be free from burrs exceeding 1.5% of the local thickness or diameter, and sharp edges or corners that impair the use of the material

Characteristics of 5251 aluminum forgings

  • Good weldability and corrosion resistance
  • Excellent cold workability
  • High strength, especially in high temperatures
  • Good plasticity and low density
  • Excellent forming properties and easy to process.

features of 5251 aerospace aluminum forging

Application of 5251 aviation aluminum forgings

Common forging shapes include but are not limited to the following:

  • Flat forgings: used to manufacture large planar components, such as wing and fuselage surfaces.
  • Ring forgings: used to manufacture aircraft engine shells, hubs, and gas turbine components.
  • Axial forgings: used to manufacture aircraft engine shafts and blades.
  • T forgings: used to manufacture corners connecting two components.
  • Z forgings: used to manufacture components that need to withstand bidirectional loads, such as struts and suspension parts.

The above are only common forging shapes, and other forging shapes may be used in different application scenarios.

application of 5251 aerosapce aluminum forging

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