Process for preparing high-weight nickel ingots by vacuum melting method

Abstract

The invention relates to a process for preparing high-weight nickel ingots by a vacuum melting method, which comprises the following steps of: taking 40 percent of nickel raw materials, starting melting when the pressure is lower than -0.5MPa, lowering the temperature for continuous melting until the nickel raw materials are completely melted, gradually cooling and congealing nickel water and stopping melting; taking 40 percent of nickel raw materials, starting the melting when the pressure is lower than -0.75MPa, raising the temperature until the nickel raw materials are completely melted, gradually cooling and congealing the nickel water and stopping the melting; taking 20 percent of nickel raw materials, starting the melting at 430 to 630 DEG C during vacuum pumping, introducing argon gas when the pressure is lower than -0.1 MPa, raising the temperature for continuously melting and heating for a while until the nickel water is completely melted; adding deoxidizing agents and reducing the temperature for furnace swinging; and introducing argon gas for casting and preparing the nickel ingots. In the process, 500KG of nickel raw materials can be melted in one time and can be cast into nickel ingots with the weight being heavier than 500kg.

Description

Technical field [0001] The invention relates to a process for preparing nickel ingots, in particular to a process for preparing nickel ingots above 500KG, in particular to a process for preparing heavy nickel ingots by a vacuum melting method. Background technique [0002] At present, the coil weight of nickel strip produced by nickel strip manufacturers is basically below 200KG, and none of them can reach or exceed the weight of 500KG. This is mainly limited by the most critical technology in the nickel strip production process-smelting, due to weight specifications Significant increase, and strict regulations on physical dimensions and performance have made the production process more complex and higher technical content. Due to the large differences in physical properties between nickel and copper, iron, steel and other metal materials, The smelting methods of copper, iron, steel and other metal materials cannot be applied to the smelting of nickel. For many years, they can on...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that heavy nickel ingots are difficult to prepare, and propose a process for preparing heavy nickel ingots by vacuum smelting; it can smelt nickel raw materials exceeding 500KG at one time and cast them into nickel ingots weighing more than 500KG