40NiCrMo2 KB Steel in Aerospace Industry: Extreme Conditions and Reliability

The 40NiCrMo2 KB Steel, also known as 40NCD2 KB Steel, is widely used in the aerospace industry due to its excellent mechanical properties and chemical composition. It is specifically designed to withstand extreme conditions and ensure high reliability in aerospace applications.

Mechanical properties:
– Tensile strength: The 40NiCrMo2 KB Steel has a high tensile strength ranging from 1100 MPa to 1400 MPa. This property enables it to withstand heavy loads and resist deformation under extreme stress.
– Yield strength: It has a yield strength of 950 MPa to 1150 MPa, indicating its ability to withstand high loads without permanent deformation.
– Elongation: The steel exhibits an elongation of 10% to 13%, allowing it to tolerate some degree of deformation without fracture.
– Hardness: It has a hardness range of 39 HRC to 45 HRC, providing excellent resistance against wear and abrasion.

Chemical composition:
– Nickel (Ni): The steel contains approximately 1.45% to 1.65% nickel, which enhances its strength, toughness, and resistance to corrosion.
– Chromium (Cr): With a chromium content of around 0.60% to 0.90%, the steel exhibits increased hardenability and resistance to oxidation and corrosion.
– Molybdenum (Mo): It contains approximately 0.15% to 0.25% molybdenum, which improves its strength, hardenability, and resistance to pitting and crevice corrosion.
– Carbon (C): The carbon content is around 0.35% to 0.43%, providing good hardenability and strength to the steel.
– Silicon (Si): It has a silicon content of approximately 0.1%, contributing to the steel’s strength, ductility, and resistance to oxidation.
– Manganese (Mn): The steel contains around 0.60% to 0.90% manganese, which improves its machinability, strength, and hardness.
– Phosphorus (P) and Sulfur (S): These elements are present in very low amounts, typically less than 0.04% each, to maintain the steel’s purity and minimize negative effects on its mechanical properties.

Overall, the 40NiCrMo2 KB Steel is a highly reliable and durable material for aerospace applications, thanks to its excellent mechanical properties, including high tensile and yield strength, good elongation, and hardness. Its chemical composition, with the right balance of alloying elements, provides the necessary strength, toughness, and corrosion resistance required in extreme aerospace conditions.
40NiCrMo2 KB Steel grade
1699015785