Application of a Mold Flux in High Speed Continuous Casting Peritectic Steel
A technology of mold slag and peritectic, which is applied in the field of iron and steel smelting and continuous casting, can solve the problems that the liquid slag layer cannot lubricate the copper mold and the initial casting slab, and the thickness of the liquid slag layer is reduced, and achieves heat control effect and uniform, Effect of promoting crystallization ability and high crystallization rate
Active Publication Date: 2022-05-17
CENT SOUTH UNIV
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Problems solved by technology
Improving the crystallization ability of the mold flux can indeed control the heat transfer to a greater extent, but how to control the composition of the mold flux to obtain a dense and uniform crystal phase to improve the heat control ability of the mold flux and obtain a stable heat transfer process is the key to high casting speed. A major difficulty in the design of mold slag for continuous casting; in addition, the increase in the crystallization rate means that the thickness of the liquid slag layer is reduced. It is a contradiction between guaranteeing lubrication
Method used
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Embodiment 1
[0056] Ingredients: binary alkalinity 1.2, CaO 37.6%, SiO 2 31.4%, Al 2 o 3 1.5%, MgO1.5%, Fe 2 o 3 1.0%, MnO3.0%, Na 2 O12.0%, Li 2 O2.0%, F - 10%;
[0057] Preparation process: same as comparative example 1.
[0058] The main physical properties of mold flux are shown in Table 1.
Embodiment 2
[0060] Ingredients: binary alkalinity 1.3, CaO 39.0%, SiO 2 30.0%, Al 2 o 3 1.5%, MgO1.5%, Fe 2 o 3 1.0%, MnO3.0%, Na 2 O12.0%, Li 2 O2.0%, F - 10%;
[0061] Preparation process: same as Comparative Example 1.
[0062] The main physical properties of mold flux are shown in Table 1.
Embodiment 3
[0064] Ingredients: binary alkalinity 1.3, CaO38.2%, SiO 2 29.3%, Al 2 o 3 1.5%, MgO3.0%, Fe 2 o 3 1.0%, MnO3.0%, Na 2 O12.0%, Li 2 O2.0%, F - 10%;
[0065] Preparation process: same as Comparative Example 1.
[0066] The main physical properties of mold flux are shown in Table 1.
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Abstract
The invention designs a mold slag application process for avoiding defects such as transverse and longitudinal cracks on the surface of a slab during high-speed continuous casting of peritectic steel. The mold flux is used for high-speed continuous casting of peritectic steel; the mold flux is composed of the following components in terms of mass percentage: CaO 37%-40%, SiO 2 28%~32%;Al 2 o 3 0.5% to 2%, MgO 1% to 4%, and MgO / Al by mass ratio 2 o 3 =1‑2:1; MnO+Fe 2 o 3 1.0%~8%;Na 2 O 3%~18%, Li 2 O 2.0%~4.0%; F ‑ 3% to 15%; in the mold flux, the binary basicity CaO / SiO 2 1.2 to 1.3. The average crystal size of the precipitated crystal phase of the mold flux designed in the present invention is less than 8 μm, and the crystal phase is a single lance spar; and the precipitated phase is uniformly distributed in the mold flux crystal layer.
Description
technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to a mold slag application process for avoiding defect phenomena such as transverse cracks and longitudinal cracks on the surface of a slab during high-speed continuous casting of peritectic steel. Background technique [0002] The mass fraction of carbon content in peritectic steel is 0.10-0.18%, and the peritectic reaction of L+δ→γ will occur in the continuous casting process, which belongs to crack sensitive steel. Austenite is the most densely packed lattice structure with the highest density. Its volume mass is smaller than that of ferrite and other phases, so the cast slab will cause a large volume shrinkage after austenite is formed in the peritectic reaction. , resulting in uneven solidification of the initial shell, resulting in a stress gradient, and cracks at the thinner initial shell due to the inability to withstand greater stress. Stress con...
Claims
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IPC IPC(8): B22D11/111B22D11/108
CPCB22D11/111B22D11/108
Inventor 王万林翟冰钰张磊黄道远张健康张华龙徐慧
Owner CENT SOUTH UNIV