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Steel plate having high gathering degree of {222} plane and process for production thereof

A technology of {222}, surface aggregation, applied in the direction of manufacturing tools, furnace types, hot-dip plating process, etc., can solve the problems that are difficult to improve, do not achieve edging processing, omission, etc.

Active Publication Date: 2009-09-23
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, the above-mentioned method is a method for increasing the degree of {222} plane aggregation only when using a base material with an Al content of 3.5% by mass or more and less than 6.5% by mass. Increase or decrease aggregation of specific faces
[0023] Furthermore, the methods disclosed in Japanese Patent Application Laid-Open No. 3-277739 and Japanese Patent Laid-Open No. 8-188850 succeeded in reducing the generation of burrs accompanying punching to a certain extent, but did not achieve the ability to remove burrs. The point where the edging process is omitted

Method used

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  • Steel plate having high gathering degree of {222} plane and process for production thereof
  • Steel plate having high gathering degree of {222} plane and process for production thereof
  • Steel plate having high gathering degree of {222} plane and process for production thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0246] Manufacturability and {222} plane aggregation degree were studied by changing the Al content of the base steel sheet.

[0247] The base metal steel plates were fabricated according to five composition systems with different Al contents. The composition system is set as: by mass %, Al content: 3.0% (component A), 3.4% (component E), 4.0% (component B), 6.0% (component C), 7.5% (component D) ; Others contain C: 0.008%; Si: 0.2%; Mn: 0.4%; Cr: 20.0%; Zr: 0.08%; La: 0.08%; the balance is iron and unavoidable impurities.

[0248] In these component systems, an ingot was melted by vacuum melting, hot-rolled on the ingot, and thinning to a thickness of 3.0 mm was tested.

[0249] In the case of components A, B, C, and E, hot rolling into a 3.0 mm thick steel plate can be easily performed, but in the case of component D, the steel plate is frequently broken during hot rolling, and continuous hot rolling cannot be performed.

[0250] Thus, if the Al content of the base steel s...

Embodiment 2

[0265] Using an Al alloy as the second layer, a steel plate having a high degree of {222} plane aggregation was produced, and the results are shown.

[0266] The composition of the base steel plate is the following composition system, which contains Al: 1.5%, C: 0.008%, Si: 0.1%, Mn: 0.2%, Cr: 18%, Ti: 0.1%, and the rest The amount is iron and unavoidable impurities.

[0267] The base material steel plate was melted into an ingot by a vacuum melting method, hot-rolled the ingot to form a 3.8 mm-thick steel plate, and then cold-rolled to form a 0.8 mm-thick steel plate.

[0268] The main phase at normal temperature of the base steel sheet is the αFe phase. The texture of the αFe phase of the base steel sheet was measured by X-ray diffraction, and it was confirmed that the {222} plane aggregation degree was 36%, and the {200} plane aggregation degree was 20%.

[0269] Part of the base material steel sheet was heat-treated at 800° C.×10 sec in a hydrogen atmosphere before plati...

Embodiment 3

[0310] Using a Zn alloy as the deposit (second layer), a steel plate having a high degree of {222} plane aggregation was produced, and the results are shown.

[0311] The base material steel plate is a steel plate obtained by the following method: an ingot of the following composition system is smelted by a vacuum melting method, and a thickness of 3.2 mm is formed by hot rolling, followed by cold rolling to a thickness of 1.8 mm; the composition system is expressed in mass % Contains: Al: 0.01%, C: 0.005%, Si: 0.2%, Mn: 0.5%, Ti: 0.05%, and the balance is iron and unavoidable impurities.

[0312] The main phase at normal temperature of the base steel sheet is the αFe phase. The texture of the αFe phase of the base steel sheet was measured by X-ray diffraction, and it was confirmed that the plane aggregation degree of {222} was 28%, and the plane aggregation degree of {200} was 19%.

[0313] Part of the base material steel sheet was heat-treated at 770° C.×5 sec in a hydrogen...

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Abstract

A steel plate having a high gathering degree of {222} plane which has an Al content of less than 6.5% by mass, characterized in that: (1) the gathering degree of the {222} plane of Alpha Fe phase and / or Gamma Fe phase to the surface of the steel plate is 60 to 99% and / or (2) the gathering degree of the {200} plane of Alpha Fe phase and / or Gamma Fe phase to the surface of the steel plate is 0.01 to 15%.

Description

technical field [0001] The present invention relates to a steel sheet excellent in workability such as deep drawing, press working, and blanking work, and a method for manufacturing the steel sheet. Background technique [0002] Steel sheets for automobiles and home appliances require not only high strength and light weight, but also excellent workability that can be processed without cracks and wrinkles in processing steps such as press forming. [0003] The workability of the steel sheet depends on the texture of the αFe phase and the γFe phase, and in particular, the workability can be improved by increasing the {222} plane aggregation degree of crystals on the steel sheet surface. Therefore, several methods for improving the workability of steel by controlling the texture have been proposed. [0004] Japanese Patent Application Laid-Open No. 6-2069 discloses a high-strength cold-rolled steel sheet and a hot-dip galvanized steel sheet based on the X-ray diffraction inten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/06C23C2/12
CPCC21D8/0426C21D8/0236C21D9/46C21D8/0273C23C2/12C21D2211/005C21D2211/001C21D8/0436C22C38/00C22C38/06C21D8/0226C21D2201/05C21D8/0473Y10T428/12451C22C38/02C22C38/04
Inventor 稻熊彻坂本广明水原洋治
Owner NIPPON STEEL CORP
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