Hafnium Grade R3

Hafnium Grade R3 / commercial quality

Hafnium Grade R3 is an unalloyed Hafnium quality for commercial applications. The material mainly consists of Hafnium, with the Zirconium content and other residual elements controlled according to the applicable product specification.

Compared to the nuclear Grade R1, Grade R3 has wider chemical limits for various residual elements. Grade R3 is therefore intended for applications where the stricter nuclear composition requirements of Grade R1 are not necessary.

Standards and product forms

Hafnium Grade R3 is specified in various ASTM standards, depending on the product form. For strip, sheet, and plate, Grade R3 is described in ASTM B776. For bar and wire, Grade R3 is described in ASTM B737. The applicable standard depends on the requested product form and dimensions.

Properties of Hafnium Grade R3

Hafnium has a melting point of approximately 2233 B0C, a high density, and a high absorption of thermal neutrons. Grade R3 retains these characteristic material properties, with the exact mechanical properties depending on product form, dimensions, and material condition.

Hafnium is a reactive metal. During welding and other high-temperature processes, good protection against oxygen, nitrogen, and other reactive gases is important. The high melting point also does not mean that the material can be used indefinitely at very high temperatures in an oxidizing atmosphere.

Difference with Hafnium Grade R1

Grade R1 is intended for nuclear applications and has stricter requirements for chemical composition. Grade R3 is the commercial Hafnium quality and is the logical choice when no specific nuclear Grade R1 requirements apply. The applicable product specification also depends on product form and dimensions.

Applications of Hafnium Grade R3

Commercial Hafnium is used, among other things, as an alloying element in high-quality Nickel-based superalloys, where small additions can influence grain boundaries and performance at high temperatures. Hafnium is also used in specialized electronic, vacuum, and plasma applications.

The final material choice must be aligned with the required purity, product form, temperature, atmosphere, and project specification.

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