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Production method for improving surface quality of steel plate
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A production method and surface quality technology, applied in workpiece surface treatment equipment, metal rolling, manufacturing tools, etc., can solve problems such as poor effect, small effect, neglect of material effect, etc., and achieve continuous and stable surface quality Effect
Inactive Publication Date: 2019-08-23
NANJING IRON & STEEL CO LTD
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Problems solved by technology
Technologists who research on the surface quality of steel plates often focus on the rolling process and inspection process, but with little effect and poor results, ignoring the influence of the smelting process on the surface quality of rolled products, and ignoring the role of the raw materials of the material itself
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Embodiment 1
[0036] A kind of production method of improving steel plate surface quality that the present embodiment provides, comprises:
[0037] S1, its chemical composition and mass percentage are as follows: C: 0.02%~0.10%, Si≤0.15%, Mn: 0.80%~2.20%, P≤0.020%, S≤0.0050%, Ni≤0.30%, Nb≤0.070% , Cu≤0.50%, N≤0.0050%, Ti: 0.006%~0.020%, Cr≤0.30%, Al: 0.015%~0.050%, the balance is Fe and impurities;
[0038] S2. The oxygen blowing top-bottom double blowing converter is used for smelting, and the molten steel whose purity meets the requirements is obtained through LF refining treatment and RH vacuum degassing operation;
[0039] S3. CCM pouring adopts full protection pouring, and the superheat of the tundish meets 33°C to ensure smooth pouring and good melting of mold slag. After 48 hours of pile cooling, the billets are inspected;
[0040] S4. The billet that has passed the table inspection is heated by a walking heating furnace, the heating time is 12.1min / cm, the soaking time is 55min, an...
Embodiment 2
[0045] A kind of production method of improving steel plate surface quality that the present embodiment provides, comprises:
[0046]S1, its chemical composition and mass percentage are as follows: C: 0.10%~0.30%, Si≤0.15%, Mn: 0.30%~1.80%, P≤0.020%, S≤0.0050%, Ni≤0.30%, Nb≤0.070% , Cu≤0.50%, N≤0.0050%, Ti: 0.006%~0.020%, Cr≤0.30%, Al: 0.015%~0.050%, the balance is Fe and impurities;
[0047] S2. The oxygen blowing top-bottom double blowing converter is used for smelting, and the molten steel whose purity meets the requirements is obtained through LF refining treatment and RH vacuum degassing operation;
[0048] S3. CCM pouring adopts full-protection pouring, and the superheat of the tundish meets 37°C to ensure smooth pouring and good melting of mold slag. After 48 hours of pile cooling, the billets are inspected;
[0049] S4. The billet that has passed the table inspection is heated by a walking heating furnace, the heating time is 12.6min / cm, the soaking time is 53min, and...
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Abstract
The invention discloses a production method for improving the surface quality of a steel plate. The steel plate is prepared from the following chemical components in percentage by mass: 0.02 percent to 0.30 percent of C, less than or equal to 0.15 percent of Si, 0.30 percent to 2.20 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.0050 percent of S, less than or equal to 0.30 percent of Ni, less than or equal to 0.070 percent of Nb, less than or equal to 0.50 percent of Cu, less than or equal to 0.0050 percent of N, 0.006 percent to 0.020 percent of Ti, less than or equal to 0.30 percent of Cr, 0.015 percent to 0.050 percent of Al, and the balance Fe and impurities. According to the production method for improving the surface quality of the steel plate provided by the invention, through a reasonable component design and a high-efficiency heating furnaceheating temperaturesystem, the oxidized scale generation quantity and the oxidized scale generation thickness are reduced; and by matching with a dephosphorization way in the rolling process, the manufacturing method for improving the surface quality of the steel plate is obtained, the surface quality amendment rate is reduced to 0.31 percent from 0.53 percent, and the enterprise profitability is improved.
Description
technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a production method for improving the surface quality of steel plates. Background technique [0002] With the increasingly fierce competition in the domestic market, customers are increasingly demanding on the quality of steel plates. Industries such as construction machinery and shipbuilding have very strict requirements on the surface quality of steel plates. Among them, steel plates for Carter and steel plates for luxury cruise ships have extremely high requirements on the surface. The surface roughness visible to the naked eye caused by the exfoliation of the pressed iron oxide scale is not allowed to cause water ripples during the manufacturing process, and the entire steel plate is not allowed to have pits and pits. Technologists working on the surface quality of steel plates often focus on the rolling process and inspection process, but with little success ...
Claims
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Application Information
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