A method for suppressing red rust on the surface of hot-rolled H-shaped steel
A technology of H-beam and red rust, applied in the field of steel rolling, can solve problems such as process conflicts and lack of equipment conditions, and achieve the effect of improving surface quality and appearance, and reducing the tendency of surface red rust
Active Publication Date: 2018-11-23
CISDI RES & DEV CO LTD
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Problems solved by technology
There are many reports on surface red rust control measures in the field of plate and strip production, such as reducing the Si content in the composition, increasing the descaling temperature, increasing the descaling pressure and passes, and preventing the roll surface from falling off, etc., but for the existing Conventional H-beam production, these measures either conflict with the process, or do not have the equipment conditions at all
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[0014] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0015] The process flow of a large domestic steel mill is: walking furnace-coarse descaling-BD1-BD2-universal rolling mill-cooling bed-sawing-warehousing, and the main production varieties are Q235~Q460 grade structural steel. The heating temperature is 1220℃~1270℃, the inlet temperature of BD1 is 1120℃~1140℃, the inlet temperature of BD2 is 1050℃~1070℃, the inlet temperature of universal rolling mill is 1120℃~1140℃, the final rolling temperature is 900℃~920℃, the inlet temperature of cooling bed 860℃~880℃, the cooling bed outlet temperature is 60℃~80℃.
[0016] Since it was put into production, the product has a serious problem of red rust on the surface, which affects the appearance quality. The reasons are analyzed as follows: (1) Coarse descaling is only set at the exit of the heating furnace in the rolling line, and there is no descal...
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The invention relates to a method for restraining red rust on hot rolled H-shaped steel. The method is characterized by comprising the following steps that firstly, when H-shaped steel enters a rolling mill to be rolled, within the rolling temperature range from 900 DEG C to 1,150 DEG C, rolling cooling water is prevented from being left in a groove which is defined by a rolled H-shaped steel web and top flanges; secondly, after final rolling, on a runout table and a cold bed, air cooling is adopted, the H-shaped steel is cooled to 100 DEG C or below; and thirdly, when the head and the tail of the H-shaped steel are sawn after the H-shaped steel gets out of the cold bed, sawing cooling water is prevented from entering the groove which is defined by the H-shaped steel web and the top flanges to form residue. By means of the method, the interaction of the surface and water is limited during the high-temperature stage and the normal-temperature storage stage of the H-shaped steel, generation of rufous FeOOH and Fe2O3 is restrained, surface red rusting tendency is weakened, and the surface mass and the appearance are improved advantageously.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for suppressing red rust on the surface of hot-rolled H-shaped steel. Background technique [0002] H-shaped steel is an economical cross-section steel. Compared with ordinary I-shaped steel, it has large section modulus and light weight due to its uniform shape, excellent mechanical properties, uniform deformation and small internal stress during rolling. , Save metal, easy to assemble and other advantages, so it is widely used in industries, buildings, bridges, offshore platforms and other structures. [0003] Traditional H-shaped steel production usually goes through heating-descale-BD1 (break down)-BD2-universal rolling mill-cooling bed-finishing process. Compared with material production, the H-beam production line is only equipped with descaling at the exit of the heating furnace, and there is no descaling during the rolling process, so the secon...
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IPC IPC(8): B21B1/088B21B9/00B21B37/74
CPCB21B1/088B21B9/00B21B37/74B21B2261/20
Inventor 韩会全王万慧
Owner CISDI RES & DEV CO LTD