Manufacturing method of high-purity nickel strap

Abstract

The invention discloses a manufacturing method of a high-purity nickel strap. The method comprises the steps of hot rolling and cogging an un-smelted nickel plate, then processing the cogged semi-finished product into a nickel strap with desired thickness through at least one annealing process and at least one cold rolling process. According to the manufacturing method, not only can the high purity of the material be guaranteed, the energy consumption and the nickel loss are reduced, the delamination defect in an electrolytic nickel raw material plate can be repaired effectively; the pass percent is high by adopting the electrolytic nickel raw material plate provided by a plurality of existing electrolytic nickel plate manufacturers, and the produced nickel strap has good consistency; and meanwhile, due to the method, the production efficiency is high, the energy consumption is low, and rolling mill component loss is small.

Description

technical field [0001] The invention relates to a method for manufacturing a high-purity nickel strip, more specifically a method for directly using an electrolytic nickel plate to manufacture a high-purity nickel strip. Background technique [0002] High-purity nickel strips generally refer to nickel strips containing more than 99.9% by weight of Ni. Compared with the currently commonly used Ni200 and Ni201 strips (containing less than 99.8% by weight of Ni), the higher purity of nickel will bring characteristics that conventional pure nickel materials cannot possess, such as high-purity nickel with higher conductivity, Better flexibility, lower recrystallization temperature. The market and application of high-purity nickel are very extensive. Among them, the high-purity nickel plate can be directly used as an additive element in the development of superalloys and new alloys in the aviation and cosmic atomic industries, for the processing of high-tension alloy parts in ae...

AI Technical Summary

Problems solved by technology

These nickel plates are more expensive

And since electrolytic nickel plates are mostly used in the electroplating industry or cut into small pieces of nickel for smelting and adding alloying elements (such as stainless steel), whether there is obvious delamination and / or micropores in the electrolytic plate will not have a negative impact on these applications , so most electrolytic nickel plate production plants do not need or take the initiative to increase equipment and production input to reduce delamination and / or porosity defects inside the electrolytic nickel plate

[0008] 2. Low production efficiency, high energy consumption and serious loss of parts of the rolling mill due to the use of cold rolling billets

[0010] 3. With the conventional welding method, the purity near the joint is low, and the thickness fluctuates greatly, which will affect the consistency of the high-purity nickel strip

[0013] 1. Using cold rolling to open the billet, the production efficiency is low, the energy consumption is high and the parts of the rolling mill are seriously worn out

Moreover, for electrolytic nickel sheets with delamination and / or microporous defects inside, cold rolling with a small amount of deformation first will generate a large shear force near the internal defects, which will easily lead to accelerated propagation of crack defects in the material until delamination failure

[0014] 2. The vacuum heat treatment furnace with intermittent operation used many times in its process will seriously affect the output of high-purity nickel strips mainly thin strips

[0015] 3. After several cold rolling processes, the electrolytic nickel plate will be extended to more than several meters along the length direction (the raw material electrolytic nickel plate is generally about 1 meter long) and cannot be coiled, but it can be heat-treated at such a shape and length at high temperature Due to the high cost of vacuum heat treatment furnace, it is actually impossible to adopt it in production practice.

[0016] The above-mentioned prior art is still unable to be applied and promoted on a large scale due to the relatively large defects in the mass production practice of high-purity nickel strips.

Images