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Cold-rolled steel plate and method for producing same

A technology of cold-rolled steel plate and manufacturing method, which is applied in the field of cold-rolled steel plate and its manufacturing, can solve the problems of poor flatness and the like, and achieve the effects of excellent shape freezing, formability and shape freezing

Active Publication Date: 2014-03-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In addition, it is known that the main cause of the deterioration of the flatness is warping of the ridge line during the bending process.

Method used

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  • Cold-rolled steel plate and method for producing same
  • Cold-rolled steel plate and method for producing same
  • Cold-rolled steel plate and method for producing same

Examples

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Embodiment 1

[0087] Examples of the present invention will be described. Steels having the chemical compositions shown in Table 1 were melted, and test materials were produced under the manufacturing conditions shown in Tables 2 and 3. In Table 1, solid solution B refers to the value of B-11 / 14×N. However, when Ti is added, it refers to the value of B-11×(|N / 14-Ti / 48|+(N / 14-Ti / 48)) / 2. In addition, when the calculated value was 0 or less, it was set as 0. The details of the manufacturing conditions are as follows. First, in the hot rolling process, molten steel is heated at 1250° C. for 1 hour, and rough rolling and finish rolling are performed. FT and CT shown in Tables 2 and 3 are finishing temperature and coiling temperature, respectively. The thickness of the hot rolled sheet is 2.0~3.5mm. Next, pickling is performed before the cold rolling process, and rolling is carried out at room temperature until the plate thickness is 0.6 to 1.0 mm. Next, as an annealing step, heating is per...

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Abstract

Provided is a cold-rolled steel plate having excellent moldability and shape retention, and outstanding production stability using actual machinery. Also provided is a method for producing same. The composition contains 0.0010 to 0.0030% C, no more than 0.05% C, 0.1 to 0.3% Mn, no more than 0.05% P, no more than 0.02% S, 0.02 to 0.10% Al, no more than 0.005% N, 0.010 to 0.030% Nb, and 0.0010 ?B-11 / 14×N?0.0050% B, with the remainder made up of iron and inevitable impurities. The average total elongation (Elm) is at least 42%, and average r value (rm) is 1.2 to 1.6. By maintaining post cold-rolling annealing for 30 to 200 sec. at a holding temperature of (820+Nb / 15+B-CR) to 860°C according to compression rate CR(%), Nb content (mass ppm) and B content (mass ppm), it is possible to manufacture the cold-rolled steel plate using actual machinery in a stable manner, without pinpoint control of the holding temperature.

Description

technical field [0001] The present invention relates to a cold-rolled steel sheet which is excellent in formability, shape freezing, and manufacturing stability, and a manufacturing method thereof, which is most suitable as a member of a large flat plate-shaped part such as a backlight chassis of a large liquid crystal television. Background technique [0002] In thin liquid crystal TVs and OA equipment, etc., flat-shaped members formed mainly by bending and bulging are often used. Members (materials) used in these parts are often required to have flatness in addition to the processing degree required for the part shape from the viewpoint of product design and thinning. However, flatness tends to deteriorate when bending or bulging the flat plate surface of a member (material). This deterioration of flatness is a phenomenon caused by the poor shape fixability of the member (material) when the member (material) is press-formed. Therefore, both workability and shape fixabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/14C21D8/02C21D9/46
CPCC22C38/12C21D9/46C21D8/0273C21D8/0236C21D8/02C22C38/14
Inventor 高城重宏藤田耕一郎花泽和浩木津太郎
Owner JFE STEEL CORP