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B-containing high-formability extremely thin hot-rolled pickling plate and preparation method thereof

A hot-rolled pickling and formability technology, which is applied in the field of hot-rolled pickling sheets with high formability and ultra-thin specifications containing B and its preparation, can solve the problem of less than 400MPa, the lowest and effective solid solution B content is reduced, Mn and Ti The problem of low content is eliminated, and the effect of eliminating the yield plateau, suppressing the transverse fold defect and improving the surface quality is achieved.

Active Publication Date: 2020-05-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • B-containing high-formability extremely thin hot-rolled pickling plate and preparation method thereof
  • B-containing high-formability extremely thin hot-rolled pickling plate and preparation method thereof

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preparation example Construction

[0021] The preparation method of the B-containing high-formability ultra-thin specification hot-rolled pickling plate of the present invention mainly includes the following steps: steel billet→hot continuous rolling→hot-rolled raw material uncoiling→drawing and leveling unit breaking scale→pickling, characterized in that: the hot The heating temperature of the billet in the continuous rolling step is 1200°C to 1280°C; the start rolling temperature of the finish rolling in the hot continuous rolling step is 1080°C to 1150°C; the finish rolling temperature in the hot continuous rolling step is 860°C °C to 920 °C; the coiling temperature in the hot continuous rolling step is 540 to 600 °C.

[0022] In the present invention, when the stretching and leveling unit breaks the scale, the elongation of the stretching and leveling unit is controlled to be 1.0% to 2.0%. will get worse.

[0023] The start rolling temperature of the finish rolling in the hot continuous rolling step of the...

Embodiment 1

[0028] The 2050 hot rolling unit (7-stand continuous rolling finishing unit) is used to produce ultra-thin specification hot-rolled pickling plates with high surface quality and high formability containing B ultra-low C+Ti micro-alloying treatment. The chemical composition weight percent of the starting billet is: [C]: 0.0031%, [Si]: 0.19%, [Mn]: 0.86%, [P]: 0.004%, [S]: 0.001%, [B]: 0.0026%, [Ti]: 0.056%, [Als]: 0.044%, [N]: 0.0028%, [O]: 0.0028%, and the rest is Fe and unavoidable impurities.

[0029]The preparation method is: billet heating → descaling → rough rolling → finishing rolling → laminar cooling → coiling → cooling the steel coil to room temperature (≤40°C) → uncoiling of hot-rolled raw materials → laser welding → scale breaking by the stretching and leveling unit → pickling →rinsing→drying→online leveling→edge trimming→online oiling→baling→packing and storage. The thickness of the steel billet is 230mm. After being heated at 1240°C, it is descaled after being re...

Embodiment 2

[0033] The 2050 hot rolling unit (7-stand continuous rolling finishing unit) is used to produce ultra-thin specification hot-rolled pickling plates with high surface quality and high formability containing B ultra-low C+Ti micro-alloying treatment. The chemical composition weight percent of the starting billet is: [C]: 0.0017%, [Si]: 0.14%, [Mn]: 0.95%, [P]: 0.002%, [S]: 0.002%, [B]: 0.0048%, [Ti]: 0.036%, [Als]: 0.028%, [N]: 0.0020%, [O]: 0.0030%, and the rest is Fe and unavoidable impurities.

[0034] The preparation method is: billet heating → descaling → rough rolling → finishing rolling → laminar cooling → coiling → cooling the steel coil to room temperature (≤40°C) → uncoiling of hot-rolled raw materials → laser welding → scale breaking by the stretching and leveling unit → pickling →rinsing→drying→online leveling→edge trimming→online oiling→baling→packing and storage. The thickness of the steel billet is 230mm. After being heated at 1240°C, it is descaled after being r...

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Abstract

The invention belongs to the technical field of pickling steel strip production, and particularly relates to a B-containing high-formability extremely thin hot-rolled pickling plate and a preparationmethod thereof. The B-containing high-formability extremely thin hot-rolled pickling plate with high surface quality and the preparation method thereof are provided. The hot-rolled pickling plate comprises 0-0.005% of C, 0.10-0.20% of Si, 0.60-1.00% of Mn, 0.002-0.005% of B, 0.03-0.06% of Ti, 0.010-0.060% of Als, 0-0.010% of P, 0-0.002% of S, 0-0.0050% of N, 0-0.0040% of O and the balance and inevitable impurities. The hot-rolled pickling plate obtained by controlling steel chemical components and the preparation process has the advantages of being high in tensile strength, high in elongation,low in yield strength and low in yield ratio.

Description

technical field [0001] The invention belongs to the technical field of production of pickling steel strips, and in particular relates to hot-rolled pickling strips with high formability and ultra-thin specifications containing B 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D8/02
CPCC22C38/004C22C38/02C22C38/04C22C38/14C22C38/06C22C38/002C22C38/001C21D8/0226C21D2211/005C21D2211/009C21D2211/004
Inventor 汪创伟李正荣崔凯禹熊雪刚
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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