Cold heading steel, ladle furnace refining process of cold heading steel and production process of cold heading steel
A ladle furnace refining and production process technology, which is applied in the field of iron and steel smelting, can solve the problem that cold heading steel cannot meet the normal temperature processing performance and mechanical performance at the same time, and achieve the effects of good machinability, reduced silicon content, and high cleanliness
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Embodiment 1
[0039] This embodiment provides a ladle furnace refining process for the production of cold heading steel. In the early stage of the ladle furnace refining process, aluminum is used for deep deoxidation. For acid-soluble aluminum requirements, the amount of aluminum added at one time is 150-200kg, and the total aluminum content at the end point is guaranteed to be above 0.02%. Ferroalloy is added after adding aluminum at one time to prevent slag from being tapped.
[0040] By adding the amount of aluminum at one time, the deep deoxidation of molten steel in the ladle furnace can be realized to meet the requirements of cleanliness, and the shape and distribution of inclusions can also be improved; moreover, adding aluminum to the ladle furnace at one time can reduce the furnace temperature. The silicon content in the inner molten steel, so that the silicon content is controlled within the range of ≦0.10%, is conducive to improving the machinability of the final cold heading stee...
Embodiment 2
[0046] This embodiment provides a cold heading steel production process using the ladle furnace refining process described in Embodiment 1. The cold heading steel production process also includes an electric furnace smelting step before the ladle furnace refining step and a Continuous casting step after furnace refining.
[0047] The electric furnace is a 100-ton electric furnace, and the electric furnace smelting process specifically includes a batching step, a first feeding step, an electrification step, and a second feeding step. in,
[0048] In the batching step, add 15 tons of molten iron into the 100-ton electric furnace, and then add the amount of scrap steel according to the amount of molten iron added, and the copper content in the scrap steel is 0.22%.
[0049] Carry out charging for the first time after described batching step, add the mixture of scrap steel and pig iron of 50 tons in described 100 tons electric furnace.
[0050] Start to energize the electric fur...
Embodiment 3
[0062] This embodiment provides a cold heading steel production process using the ladle furnace refining process described in Embodiment 1. The cold heading steel production process also includes an electric furnace smelting step before the ladle furnace refining step and a Continuous casting step after furnace refining.
[0063] The electric furnace is a 100-ton electric furnace, and the electric furnace smelting process specifically includes a batching step, a first feeding step, an electrification step, and a second feeding step. in,
[0064] In the batching step, 45 tons of molten iron is added to the 100-ton electric furnace, and then the amount of steel scrap is added according to the amount of molten iron added. The content of copper in the steel scrap is 0.20%.
[0065] Carry out charging for the first time after described batching step, add 40 tons of steel scraps in described 100 tons electric furnace.
[0066] Start to energize the electric furnace after the first...
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