Process for improving tin segregation in copper-nickel-tin alloy rods

By combining copper-titanium master alloying with intermittent stop casting, surface turning, micro-forging, stepped annealing, and extrusion processes, the problem of tin segregation in copper-nickel-tin alloys was solved, and copper-nickel-tin alloy bars with uniform composition and excellent performance were prepared.

CN122344698APending Publication Date: 2026-07-07CHINALCO LUOYANG COPPER PROCESSING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINALCO LUOYANG COPPER PROCESSING CO LTD
Filing Date
2026-05-28
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

During the solidification process, copper-nickel-tin alloys exhibit macroscopic and microscopic segregation of tin, leading to the formation of brittle phases at grain boundaries. This affects the hot working plasticity and toughness of the alloy, reducing the overall performance of the material.

Method used

By employing a copper-titanium master alloy and an intermittent stop-casting process, combined with surface machining, micro-forging, stepped annealing, and extrusion processes on the ingot surface, and through multiple deformation and annealing treatments, the homogeneous diffusion of tin element is promoted, thus producing copper-nickel-tin alloy rods with uniform composition.

Benefits of technology

It significantly reduces tin segregation, improves the compositional uniformity and microstructure density of the alloy, ensures that the difference in tin content between the edge and center of the bar does not exceed 0.3 wt%, and enhances the material's performance consistency and toughness.

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Abstract

The application discloses a process method for improving tin segregation of copper-nickel-tin alloy rod, relates to the field of non-ferrous metal smelting and processing technology, and the mass percentage composition of the copper-nickel-tin alloy is as follows: Ni 3.5%-15.5%, Sn 1.8%-8.5%, Ti 0.08%-0.3%, and the balance is Cu and inevitable impurities; and the preparation method comprises the following steps: after raw materials are melted, copper-titanium intermediate alloy is added to perform intermittent stop-pulling casting to obtain a cast ingot; a car body is sequentially subjected to axial microforging, first-stage two-level homogenizing annealing, forging and second-stage two-level homogenizing annealing; and finally, the cast ingot is sent into a preheated extruding machine to perform extrusion, so as to obtain a copper-nickel-tin alloy extruded rod. The copper-nickel-tin alloy extruded rod produced by adopting the process method has uniform end surface composition, and the tin content difference from the edge to the center of the end surface is not more than 0.3wt%; and the rod has uniform and dense structure.
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