C103 Nb-Hf Alloy Plate

1. The hafnium element uniformly strengthens the material, and it does not deform or collapse at high temperatures. Ordinary niobium plates will significantly lose their strength above 1500°C. However, through the VAR vacuum melting process, 1% of hafnium is dispersed as fine carbides on the grain boundaries, effectively pinning dislocations and enabling the C103 Nb-Hf Alloy Plate to maintain an tensile strength of over 400 MPa at 1800°C. This is something that ordinary pure niobium plates cannot achieve.

 

2. Resistant to acid corrosion, not afraid of strong acid environments

Niobium itself has extremely strong resistance to hydrochloric acid, sulfuric acid, and phosphoric acid. Our plates undergo acid washing and vacuum annealing treatment, resulting in a surface without oxide inclusions. They can remain stable even in boiling sulfuric acid, far superior to ordinary high-temperature alloys.

 

3. Good welding performance, no cracking during processing

The hafnium content of C103 alloy is controlled within the precise range of 1% - any higher will make it brittle, and any lower will lose its advantage at high temperatures. This ratio was determined through extensive process verification, ensuring that the plates do not produce hot cracks after TIG welding. Customers can directly process and shape them after receiving them.

1. Components of the high-temperature section of the aeroengine

The temperature of the engine combustion chamber exceeds 1600°C. Ordinary nickel-based alloys will undergo creep deformation, while the C103 Nb-Hf Alloy Plate, due to the hafnium strengthening mechanism, maintains rigidity within this temperature range and is suitable for use as load-bearing components such as flame tubes and guide vanes.

 

2. Structural components of nuclear reactors

Nickel has an extremely low absorption cross-section for thermal neutrons, and the controlled neutron absorption property of hafnium makes this combination less prone to brittleness in irradiation environments and ensures stable dimensions, making it suitable for use as internal support structures and auxiliary components of fuel cladding in reactors.

 

3. Insulation and load-bearing plates for high-temperature vacuum furnaces

There is no oxidation protection in a vacuum furnace, and ordinary metals will rapidly oxidize and fail. Our plates undergo vacuum annealing treatment, have a high surface density, and have a service life more than twice that of molybdenum plates in a 1800°C vacuum environment.

 

4. Acid-resistant inner linings for chemical equipment

In the production of phosphoric acid and sulfuric acid, equipment is in constant contact with strong acid and high-temperature media. The dual acid and high-temperature resistance characteristics of the C103 plate make it the preferred material for reaction vessel linings and heat exchange pipe walls.

China Super Tech Co., Ltd.'s customization capability on the C103 Nb-Hf Alloy Plate is not simply "cutting according to size", but starts from the material level:

 

1. Precise composition control: Our VAR smelting furnace can control the hafnium content within the range of 0.95% to 1.05%, and make micro-adjustments based on your operating temperature. For high-temperature applications, it is set at the upper limit, while for welding applications, it is set at the lower limit.

 

2. Flexible thickness: From 0.5mm thin plates to 50mm thick plates, they can all be rolled. Thin plates use multi-pass cold rolling + intermediate annealing to ensure no edge cracking; thick plates use forging + hot rolling to ensure no internal porosity.

 

3. Provide material certificates with the goods: Each batch comes with a spectral analysis report and a mechanical property test sheet, and the data is traceable.

 

This full-chain control from smelting to delivery is our core capability that distinguishes us from ordinary traders.

Parameter	Specification
Product Name	C103 Nb-Hf Alloy Plate
Material Grade	C103 (Nb-Hf-Ti-Zr Alloy)
Chemical Composition	Nb Balance, Hf 10%, Ti 1%, Zr 0.7% (typical)
Standard	ASTM B654, AMS 7852
Density	8.85 g/cm³
Melting Point	2350 ± 50°C
Tensile Strength (RT)	≥ 420 MPa
Yield Strength (RT)	≥ 250 MPa
Elongation	≥ 20%
Elastic Modulus	100–112 GPa
Thermal Conductivity	37–42 W/m·K
Operating Temperature	1200–1400°C
Surface Finish	Cold Rolled, Polished, Pickled
Thickness Range	0.5–20 mm
Width Range	50–1000 mm
Length Range	100–3000 mm
Flatness	≤ 2 mm/m
Manufacturing Process	Vacuum Melting → Forging → Rolling → Annealing

 

 

 

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