Production method for SPCC-W black skin steel plate

Abstract

The invention discloses a production method for an SPCC-W black skin steel plate. The production method is characterized in that 1, the silicon content [Si] in steel is larger than or equal to 0.02 percent and less than or equal to 0.030 percent; 2, the thickness of a black steel coil is 3.0mm, the cold rolling reduction rate is 66.6 percent, and the curling tensile stress of a cold-rolled coil is controlled within 30Mpa; and 3, a cover annealing process is designed as follows: a protective medium is protected by nitrogen, a temperature heating interval of 0-440 DEG C adopts a heating speed of 85-90 DEG C / h, the temperature is kept for 3h at 440 DEG C, emulsion residues on the surface of a rolled steel coil are ensured to be fully volatilized, the temperature is heated at 440-675 DEG C by adopting a heating speed of 41-51 DEG C / h, an annealing heat preservation temperature is set to be 675 DEG C, the temperature is kept for 8h, a cooling time with a heating cover is set to be 0.5h, a temperature with the heating cover removed is 630-650 DEG C, cooling with the cover is continued when the temperature is higher than 650 DEG C, a cooling cover is used after the heating cover is removed, air cooling and water cooling are conducted for 6h, a product is discharged after cooling to 280 plus / minus 10 DEG C, ventilation oxidation is conducted on a final cooling table, rapid oxidation is conducted to form a special oxide layer, and a dense oxide layer mainly comprising Fe2O3 is formed on the outer layer.

Description

technical field [0001] The patent of the invention relates to a production method of SPCC-W black steel plate, which belongs to the field of cold processing and heat treatment of iron and steel materials. Background technique [0002] The annealing process is a common method for stress relief and microstructure improvement of cold-rolled products. Due to its use, black skin steel has high quality requirements for processing deformation and coating-free. Therefore, the production is more difficult. In order to ensure the excellence of the product's surface and mechanical properties, a new method is needed in the composition design and annealing process to meet the quality requirements. The conventional masking process needs to be carried out in a hydrogen protective atmosphere, but due to the special quality requirements of black steel, the protective medium needs to be changed. The production of SPCC-W black skin steel is realized through experimental research on bell anne...

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Problems solved by technology

SPCC-W and other types of steel, because the surface quality requires special blackening and bluish treatment, which is higher than ordinary SPCC steel types, it is very easy to have surface defects such as bonding during the production process of the cover, resulting in product degradation

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