Soft magnetic alloy smelting production method

Abstract

A magnetically-soft alloy smelt production method is provided, which characterizes as (1) melting in arc furnace, carbon content of material and auxiliary materials being not restricted, operating using return oxygen blast method, element control : Cr,Ni at lower limit or more, Si<=0.35%,slag free tapping, (2)refining steel liquid using AOD furnace, blasting temperature>=1540 DEG C, blasting in whole course, liming according to Si content, blasting in1100m#+[3] / h, O#-[2] / Ar=4 mixed gas, decarbonizing and heating-up, Cr, Ni reclamation calculating according to 97%, 100%, C=0.10%, adjusting O#-[2] / Ar=1; C=0.01%, blasting argon instead of oxygen, flux 480m#+[3] / h, prereduction 7 min, sampling for analyzing slag, adding reduced slag, blasting Ar for melting slag for 5 min, blasting Ar 4min before tapping, tapping with slag, bag suspending temperature :liquid line+55 DEG C, (3)casting ingot of steel liquid under the protection of Ar. The invention has a simple smelt process, little restriction to auxiliary material, low cost, low carbon content. Magnetically-soft alloy ingot smelt in the invention has precise chemical element, high steel liquid metallurgy quality, fit for the quality standard.

Description

technical field [0001] The invention relates to a smelting production method of a precision alloy in the metallurgical industry, in particular to a smelting production method of a soft magnetic alloy. Background technique [0002] Soft magnetic alloys belonging to the category of precision alloys are metal functional materials with low coercive force and high magnetic permeability widely used in modern communications, computers, household appliances and precision instruments. They are often used to make pole heads, pole shoes, Magnetic conductors, magnetic shields, rotors and stators of motors, iron cores of transformers and relays, and magnetic components in various communication, sensing, recording and other projects. Fe-Ni soft magnetic alloy and Fe-Cr soft magnetic alloy are two kinds of soft magnetic alloys that are widely used. They are mostly used in AC magnetization state and require lower power loss. [0003] Everyone knows that the chemical elements of the finishe...

AI Technical Summary

Problems solved by technology

The "vacuum induction furnace" smelting process has the advantages of accurate composition ratio, low inclusion content, and good metallurgical quality. The disadvantage is that the requirements for smelting raw materials are also extremely high. The raw materials used are high-quality pure iron and Ni plates, and must be passed through. Smelting can only be done after mechanical polishing to remove oxidation; therefore, the cost of smelting is extremely high (the cost of smelting steps is as high as 10,000 yuan / ton), so now precision alloy manufacturers usually use "electric arc furnace + VD" smelting process

[0005] The advantage of adopting the "electric arc furnace + VD" smelting process is that the smelting cost is low; the disadvantage is (1) the requirements for the electric arc furnace body are relatively strict, and a low-carbon furnace body must be used, and the electric arc furnace with asphalt lining cannot be used (due to the soft magnetic alloy The composition requirements generally require that the furnace lining does not contain carbon; compared with the asphalt lining furnace body, the cost of the low-carbon furnace body is higher); (2) the decarbonization task is completed in the electric arc furnace, and the decarbonization capacity of the electric arc furnace is limited, due to The reason for containing C in refractory materials (even if a low-carbon furnace body is used), the C content in steel (which plays a major role in magnetic properties) can only reach 0.02% at a minimum; in addition, the content of inclusion elements such as Al and Ti is also relatively high (Al ≥0.03%, Ti≥0.01%), which have a greater impact on the properties of soft magnetic alloys; (3) due to the characteristics of the electric arc furnace itself, the stirring ability of molten steel during smelting is poor, and the removal of gas and inclusions in molten steel (4) The VD furnace type is generally small, so the smelting cost is still high (the smelting step cost is about 3000 yuan / t), and the metal yield In addition, due to the small smelting capacity, the composition fluctuations between furnaces are relatively large, resulting in large fluctuations in the performance of soft magnetic alloys, and the production cycle is relatively long