Process for production of cold-rolled steel sheet having excellent press moldability, and cold-rolled steel sheet

A technology of cold-rolled steel plate and manufacturing method, which is applied in the field of cold-rolled steel plate, can solve problems such as inability to ensure the strength of pressed parts, and achieve the effect of reducing load

Active Publication Date: 2012-05-23
TOYO KOHAN CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In addition, electronic components represented by notebook computers, mobile phones, and digital cameras, and automotive engine gaskets are also required to reduce weight and size. In order to reduce the weight and size of these

Method used

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  • Process for production of cold-rolled steel sheet having excellent press moldability, and cold-rolled steel sheet
  • Process for production of cold-rolled steel sheet having excellent press moldability, and cold-rolled steel sheet

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[0089] Example

[0090] In order to explain the cold-rolled steel sheet of the present invention in more detail using Examples and Comparative Examples, slab sheets of the compositions shown in Samples 1 to 18 shown in Table 1 were prepared. Samples 1 to 11, 17, 18 are slab sheets that fall within the composition range of the present invention, and samples 12 to 16 are slab sheets that fall outside the composition range of the present invention.

[0091] In the hot rolling process, slab sheets adjusted to the components shown in samples 1 to 18 were heated to 1230°C, and hot-rolled steel sheets with a thickness of 2.0 mm were produced at the winding temperature shown in Table 2. Table 2 shows the characteristics of the hot rolled steel sheet.

[0092] Next, after pickling the hot-rolled steel sheet, it was cold rolled to 0.5 mm, and then, in a continuous annealing process, after soaking at a soaking temperature of 900°C for 20s, it was cooled at a cooling rate of 20°C / s to produce ...

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Abstract

Disclosed are: a cold-rolled steel sheet which undergoes less load during cold rolling and has excellent press moldability and high strength; and a process for producing the cold-rolled steel sheet. A hot-rolled steel sheet comprising 0.10 to 0.30 mass% of C, 0.2 mass% or more of Mn, 0.01 mass% or more of Ni (wherein the sum total of Mn and Ni is 0.5 to 2.5 mass%), and 1.2 to 9.0 mass% of Cr, with the remainder being iron and unavoidable impurities, and having a tensile strength of 1000 MPa or less is washed with an acid, and is subjected to cold rolling at a total rolling ratio of 60% or more, thereby producing a cold-rolled steel sheet. The cold-rolled steel sheet is subjected to the final continuous annealing treatment at a homogenizing temperature of 750 DEG C or higher and a cooling rate of 3 to 100 DEG C/s. In this manner, a cold-rolled steel sheet having a tensile strength of 1280 MPa or more, a breaking elongation of 3% or more, and a thickness of 0.05 to 0.60 mm.

Description

technical field [0001] The present invention relates to a method for producing a cold-rolled steel sheet excellent in press formability, and a cold-rolled steel sheet produced by the production method. Background technique [0002] Liquid crystal frame parts used in mobile phones, notebook computers, etc., and automotive engine gasket parts are often cold-formed. Therefore, the cold-rolled steel sheets used require press-formability. [0003] In addition, electronic components represented by notebook computers, mobile phones, and digital cameras, and automobile engine gaskets are also required to reduce weight and size. In order to reduce the weight and size of these components, it is necessary to reduce the thickness of the steel plate , In addition, since the same strength cannot be ensured as a pressed part, it is necessary to provide a high-strength steel sheet having a thin size and high strength. [0004] Proceeding from this technical background, aiming at the use as...

Claims

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Application Information

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IPC IPC(8): C21D9/46C22C38/00C22C38/58
CPCC21D9/46C22C38/50C21D8/0236C22C38/02C22C38/42C22C38/06C21D1/26C21D9/0006C22C38/04C21D9/0037C22C38/58C22C38/001
Inventor 大井聪史西山茂嘉吉田冬树楠本雄二秋末治
Owner TOYO KOHAN CO LTD
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