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A rolling method for improving the surface quality of steel plates
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A surface quality, steel plate technology, applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problem of insignificant improvement of steel plate quality, reduce the probability of secondary oxidation, improve removal ability, and reduce damage degree of effect
Active Publication Date: 2021-03-30
NANJING IRON & STEEL CO LTD
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Problems solved by technology
The quality of the steel plate can be improved by changing the rolling process, but the existing rolling technology has no significant effect on improving the quality of the steel plate
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Embodiment 1
[0036] A rolling method for improving the surface quality of steel plates provided in this embodiment,
[0037] S1. Its chemical composition and mass percentage are as follows: C: 0.02%~0.30%, Si≤0.15%, Mn: 0.30%~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. After passing the surface inspection, the blank is sent to a walking heating furnace for heating, with a thickness specification of 18mm, a heating time of 12.1min / cm, a soaking time of 53min, and a target tapping temperature of 1106°C;
[0039] S3. After the billet leaves the heating furnace, it advances at a speed of 3m / s. The billet is roughly descaled in the descaling box, and the descaling pressure is 23MPa. After the descaling is completed, it is carried out at a speed of 3m / s to the rolling mill for rough rolling;
[0040] S4. The starting temperature of rough rolling is 1078°C. The descaling oper...
Embodiment 2
[0045] A rolling method for improving the surface quality of steel plates provided in this embodiment,
[0046]S1. Its chemical composition and mass percentage are as follows: C: 0.02%~0.30%, Si≤0.15%, Mn: 0.30%~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;
[0047] S2. After passing the surface inspection, the billet is sent to the walking heating furnace for heating. The thickness specification is 11mm, the heating time is 11.3min / cm, the soaking time is 51min, and the target tapping temperature is 1102°C;
[0048] S3. After the billet leaves the heating furnace, it advances at a speed of 3m / s. The billet is roughly descaled in the descaling box, and the descaling pressure is 22MPa. After the descaling is completed, it is carried out at a speed of 3m / s to the rolling mill for rough rolling;
[0049] S4. The starting temperature of rough rolling is 1066°C. The descaling...
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Abstract
The invention discloses a rolling 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 equalto 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 rolling method for improving the surface quality of the steel plate provided bythe invention, through setting a reasonable component design and a rolling temperature and cooling temperaturesystem, the oxidized scale generation quantity and the oxidized scale generation thickness are reduced, and the surface quality amendment rate is reduced to 0.31 percent from 0.53 percent.
Description
technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a rolling 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. The quality of the steel plate can be improved by changing the rolling process, but the existing rolling technology has no significant effect on im...
Claims
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