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Production method of low carbon steel plate and low carbon steel plate

A low-carbon steel plate and low-carbon steel technology, applied in the field of low-carbon steel plate, can solve the problems of low-carbon steel plate with poor effect and easy to produce horizontal stripes, etc.

Active Publication Date: 2013-05-15
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using galvanizing / continuous annealing dual-purpose units for continuous annealing, the continuous annealing method of this invention can avoid or reduce the cross-grain defects of cold-rolled strip steel to a certain extent, but for thick specifications (thickness is 1.0mm-1.5 mm) low-carbon steel plate is not effective, and its surface is still prone to horizontal grains

Method used

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  • Production method of low carbon steel plate and low carbon steel plate
  • Production method of low carbon steel plate and low carbon steel plate

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preparation example Construction

[0016] According to the present invention, the preparation method of the low-carbon steel slab can adopt conventional methods in the art, as long as it is preferred to make the low-carbon steel slab of the present invention, based on the total weight of the low-carbon steel slab, The carbon content is 0.06-0.1% by weight, the silicon content is ≤0.05% by weight, the manganese content is 0.3-0.45% by weight, the phosphorus content is ≤0.025% by weight, the sulfur content is ≤0.025% by weight, and the aluminum content is 0.02-0.07% by weight. Generally speaking, the preparation method of the low-carbon steel slab includes: performing primary smelting of molten iron to obtain molten steel, and tapping the molten steel obtained from the primary smelting into a ladle; performing pre-deoxidation alloying on the molten steel during the tapping process and carburization; after tapping, carry out ladle furnace refining to the molten steel in the ladle, and the ladle furnace refining usu...

Embodiment 1

[0030] This embodiment is used to illustrate the method for producing low carbon steel plate provided by the present invention.

[0031] (1) Formation of cold-rolled sheet:

[0032] The low-carbon steel slab (composition: based on the total weight of the low-carbon steel slab, C: 0.1% by weight, Si: 0.01% by weight, Mn: 0.43% by weight, P: 0.02% by weight, S: 0.015% by weight , Al: 0.05% by weight, the balance is iron) After soaking at 1200°C, rough roll into a 30mm thick intermediate billet with a rough rolling mill, and the final rolling temperature of the rough rolling is 1050°C; then roll a 3.33mm thick billet with a finishing mill For hot-rolled strip steel, the final rolling temperature of finish rolling is 860°C; immediately after finish rolling, it is cooled to 720°C at a rate of 200°C / s, and then cooled to 650°C at a rate of 20°C / s, and enters the coiler coil Take a roll. After the strip is cooled to room temperature (25°C), it is pickled with hydrochloric acid with...

Embodiment 2

[0037] This embodiment is used to illustrate the method for producing low carbon steel plate provided by the present invention.

[0038] (1) Formation of cold-rolled sheet:

[0039] The low-carbon steel slab (composition: based on the total weight of the low-carbon steel slab, C: 0.06% by weight, Si: 0.03% by weight, Mn: 0.31% by weight, P: 0.01% by weight, S: 0.011% by weight , Al: 0.02% by weight, and the balance is iron) After soaking at 1250°C, rough roll into a 32mm thick intermediate billet with a rough rolling mill, and the final rolling temperature of the rough rolling is 1100°C; then roll a 3mm hot billet with a finish rolling mill For strip rolling, the final rolling temperature of finish rolling is 900°C; immediately after finish rolling, it is cooled to 670°C at a rate of 100°C / s, and then cooled to 640°C at a rate of 15°C / s, and then enters the coiler for coiling into rolls. After the strip is cooled to room temperature (25°C), it is pickled with hydrochloric ac...

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Abstract

The invention provides a production method of a low carbon steel plate and the low carbon steel plate. The method comprises hot rolling, cold rolling and continuous annealing on a low carbon steel slab; the hot rolling comprises soaking, rough rolling and finishing rolling; the continuous annealing method comprises successive annealing treatment, aging treatment and secondary cooling treatment on low carbon steel subjected to cold rolling; and the low carbon steel subjected to hot finishing rolling is cooled to 670-720 DEG C with a cooling rate of 100-200 DEG C / s, and then cooled to 620-660 DEG C with a cooling rate of 10-20 DEG C / s for hot rolling batching. The low carbon steel obtained by the method provided by the invention has good mechanical properties, and can avoid cross striation generation.

Description

technical field [0001] The present invention relates to a method for producing a low-carbon steel plate and a low-carbon steel plate. Background technique [0002] In recent years, with the intensification of competition in the domestic hot-dip galvanized steel sheet market, in order to better adapt to market changes and improve product competitiveness, many companies have transformed continuous hot-dip galvanizing units into dual-purpose units for galvanizing and continuous annealing. In order to meet the production needs of cold-rolled sheets, the transformation method is generally to open at the back of the annealing furnace of the galvanizing line, and add an overaging section and a secondary cooling section running in parallel with the galvanizing tank. Due to the limitation of the layout of the original galvanizing line, especially for the horizontal continuous hot-dip galvanizing line, the space available for transformation is extremely limited. In order to make full...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/06
Inventor 郑之旺汤佩林刘庆春王敏莉周一林梁英
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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