High-formability ultra-thin hot-rolled pickling plate and preparation method thereof

Abstract

The invention belongs to the technical field of acid pickling steel strip production, and particularly relates to a high-formability ultra-thin hot-rolled pickling plate and a preparation method thereof. According to the high-formability ultra-thin hot-rolled pickling plate and the preparation method thereof, the surface quality is high. The hot-rolled pickling plate consists of the following chemical components of, less than or equal to 0.005% of C, 0.10%-0.20% of Si, 0.40%-0.80% of Mn, 0.40%-0.80% of Cr, 0.03%-0.06% of Ti, 0.010%-0.060% of Als, less than or equal to 0.010% of P, less than orequal to 0.002% of S, less than or equal to 0.0050% of N, less than or equal to 0.0040% of O, and the balance Fe and inevitable impurities. According to the high-formability ultra-thin hot-rolled pickling plate and the preparation method thereof, the hot-rolled pickling plate obtained by controlling the chemical components of the steel and the preparation process has the advantages of high tensile strength, high elongation, low yield strength and low yield ratio.

Description

technical field [0001] The invention belongs to the technical field of production of pickling steel strips, in particular to hot-rolled pickling strips with high formability and ultra-thin specifications and a preparation method thereof. Background technique [0002] The hot-rolled pickled plate is made of high-quality hot-rolled thin plate as raw material. The oxide layer is removed, trimmed and finished by the pickling unit. The main processes include uncoiling of hot-rolled raw materials → laser welding → scale breaking by the stretching and leveling unit → pickling → rinsing → Drying→on-line leveling→edge trimming→on-line oiling→baling→packing and storage, the surface quality and use requirements (mainly cold-rolled forming or stamping performance) are intermediate products between hot-rolled sheets and cold-rolled sheets, It is an ideal substitute for some hot-rolled and cold-rolled sheets. Hot-rolled pickled plate is an emerging product in the plate market. Its market...

AI Technical Summary

Problems solved by technology

The C content in the hot-rolled pickling sheet involved in this patent is 0.02% to 0.06%, and the thickness is more than 2.0mm. It is a low-carbon steel. Although B and Ti are added, due to the low content of Mn and Ti, the coil The temperature is high, the highest tensile strength of the obtained pickling board is less than 400MPa, the lowest is 330MPa, the yield strength is above 240MPa, and the yield strength ratio is above 0.72

In addition, the patent does not limit the interstitial atoms N, O and other inclusion elements. When the content of N and O is high, the risk of "horizontal bending" defects in the steel strip will increase significantly, and the effective solid solution B content in the steel It is greatly reduced, which is not conducive to improving its hardenability

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