25CD4S Steel - 1.7218 - 25CrMo4 - FLE-PL1502
The 25CD4S steel alloy, also known by its DIN designation 25CrMo4, is a versatile and high-performance heat-treatable steel, ideal for applications demanding strength and reliability. Low-alloyed with chromium and molybdenum, it exhibits good hardenability and excellent tensile strength, in addition to being suitable for welding and forming processes.
Available shapes :
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Chemical composition of 25CD4S
The variations in its chemical composition for aerospace.
| % | C Carbon | Cr Chromium | Mn Manganese | Mo Molybdenum | Ni Nickel | P Phosphorus | S Sulfur | Si Silicon |
|---|---|---|---|---|---|---|---|---|
| Min. | 0.22 | 0.90 | 0.50 | 0.15 | <0.00 | <0.00 | <0.00 | 0.10 |
| Max. | 0.29 | 1.20 | 0.80 | 0.25 | 0.30 | 0.020 | 0.015 | 0.25 |
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Key properties
The most remarkable properties of this steel alloy
Ductility
≥10%
Tensile Strength
640-1080 MPa
Impact Toughness
≥700 kJ/m²
Yield Strength
≥410 MPa
How 25CD4S is used in aerospace
The practical applications of this steel in aircraft construction.
Reinforcement bars
25CD4S reinforcement bars are used in various parts of an aircraft's structure, particularly in the wings. They help strengthen the spars or ribs to better withstand loads.
Tubular chassis
Composed of an assembly of welded tubes forming a three-dimensional structure, this aerospace-grade steel is perfectly suited for this application. It is typically used in this context for ultralight aircraft (ULMs).
Reinforcements
Besides the wings, 25CD4S is also used as engine mounts for ultralight aircraft (ULMs). Since the introduction of the AIR 9160 standard, this grade has been replaced by a more advanced steel: the 15CDV6 alloy.
