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Steel sheet having high plane integration and method of production of same

Inactive Publication Date: 2009-11-12
NIPPON STEEL & SUMITOMO METAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0026]The inventors discovered that in steel sheet with an Al content of less than 6.5 mass %, if (x1) making the {222} plane integration of the Fe crystals a high specific range and / or (x2) making the {200} plane integration of the Fe crystals a low specific range, no burrs form at the cross-section at the time of punching and unprecedentedly excellent workability is obtained.
[0099]The steel having a high {222} plane integration of the present invention (the present invention steel sheet) sheet is an unprecedented steel sheet excellent in workability which has an Al content of less than 6.5 mass % and a high {222} plane integration and has a low {200} plane integration, so not being formed with burrs at the cross-section at the time of punching.
[0101]In the method of production of the present invention, in steel sheet having an Al content of less than 6.5 mass %, it is possible to increase the {222} plane integration or to lower the {200} plane integration easily and effectively. Further, the method of production of the present invention enables the production of the present invention steel sheet having a high {222} plane integration without production of new facilities by just switching processes of existing facilities easily and at low cost.

Problems solved by technology

However, meeting more sophisticated requirements is difficult with the prior art.
That is, in steel sheet with a {222} plane integration of the conventional extent, the punchability becomes poor in the working process.
Further, the plastic flowability required in complicated press forming is insufficient.
It has not been possible to meet the needs for more sophisticated working or higher efficiency of the working process.
Specifically, the above steel sheet had the problem of formation of burrs at the cross-section at the time of punching and the need for a chamfering process to remove the formed burrs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0241]The Al content of the matrix steel sheet was changed to investigate the manufacturability and {222} plane integration.

[0242]Matrix steel sheets of ingredients of five different types of Al content were produced. The Al contents were, by mass %, 3.0% (ingredients A), 3.4% (ingredients E), 4.0% (ingredients B), 6.0% (ingredients C), and 7.5% (ingredients D). In addition, the ingredients included C: 0.008%, Si: 0.2%, Mn: 0.4%, Cr: 20.0%, Zr: 0.08%, La: 0.08%, and a balance of iron and unavoidable impurities.

[0243]By each of these ingredients, ingots were produced by vacuum melting and hot rolled to try to reduce them to 3.0 mm thickness.

[0244]In the case of the ingredients A, B, C, and E, the ingots could be easily hot rolled to 3.0 mm thick steel sheets, but in the case of the ingredients D, the steel sheet frequently broke during the hot rolling, so hot rolling could not be continued.

[0245]In this way, if the Al content of the matrix steel sheet is over the range of the present...

example 2

[0259]The results of production of steel sheet having a high {222} plane integration using an Al alloy as the second layer are shown.

[0260]The ingredients of the matrix steel sheet were, by mass %, Al: 1.5%, C: 0.008%, Si: 0.1%, Mn: 0.2%, Cr: 18%, Ti: 0.1%, and a balance of iron and unavoidable impurities.

[0261]The matrix steel sheet was a steel sheet obtained by producing an ingot by the vacuum melting method, hot rolling the ingot to obtain steel sheet of 3.8 mm thickness, then cold rolling it to obtain steel sheet of 0.8 mm thickness.

[0262]The main phase of the matrix steel sheet at ordinary temperature was the αFe phase. X-ray diffraction was used to measure the texture of the αFe phase of the matrix steel sheet whereupon it was confirmed that the {222} plane integration was 36% and the {200} plane integration was 20%.

[0263]Part of the matrix steel sheet was heat treated at 800° C.×10 sec in a hydrogen atmosphere before plating. Al alloy was deposited on the surface of the matri...

example 3

[0302]The results of using a Zn alloy as the deposit (second layer) to produce steel sheet having a high {222} plane integration are shown.

[0303]The matrix steel sheet was a steel sheet obtained by using the vacuum melting method to obtain an ingot of ingredients, by mass %, of an Al content of 0.01% and also C: 0.005%, Si: 0.2%, Mn: 0.5%, Ti: 0.05%, and a balance of iron and unavoidable impurities, hot rolling to a thickness of 3.2 mm, then cold rolling to a thickness of 1.8 mm.

[0304]The main phase of the matrix steel sheet at ordinary temperature was an αFe phase. X-ray diffraction was used to measure the texture of the αFe phase of the matrix steel sheet whereupon it was confirmed that the {222} plane integration was 28% and the {200} plane integration was 19%.

[0305]Part of the matrix steel sheet was heat treated by 770° C.×5 sec in a hydrogen atmosphere before plating.

[0306]On the surface of the matrix steel sheet, the electroplating method was used to deposit an Zn alloy. For t...

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Abstract

Steel sheet having a high {222} plane integration comprising steel sheet having an Al content of less than 6.5 mass % characterized by one or both of (1) a {222} plane integration of one or both of an αFe phase and γFe phase with respect to the steel sheet surface being 60% to 99% and (2) a {200} plane integration of one or both of an αFe phase and γFe phase with respect to the steel sheet surface being 0.01% to 15%.

Description

TECHNICAL FIELD[0001]The present invention relates to steel sheet excellent in deep drawability, press formability, punchability, and other workability and a method of production of that steel sheet.BACKGROUND ART[0002]For sheet steel for automobiles or home electrical appliances, in addition to the needs for higher strength and lighter weight, excellent workability enabling working in press forming and other work processes without causing cracks or wrinkles is required.[0003]The workability of steel sheet depends on the texture of the αFe phase or the γFe phase. In particular, by increasing {222} plane integration of the crystals at the steel sheet surface, it is possible to improve the workability. For this reason, several methods have been proposed for controlling the texture to raise the workability of the steel.[0004]Japanese Patent Publication (A) No. 6-2069 discloses high strength cold rolled steel sheet and hot dip galvanized steel sheet wherein the amounts of Si, Mn, and P ...

Claims

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Application Information

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IPC IPC(8): B32B7/00C22C38/06B05D3/12C21D8/02B05D3/02
CPCC21D8/0226C21D8/0236C21D8/0273C21D9/46C21D2201/05C21D2211/001Y10T428/12451C22C38/00C22C38/06C23C2/12C21D8/0426C21D8/0436C21D8/0473C21D2211/005C22C38/02C22C38/04
Inventor INAGUMA, TOORUSAKAMOTO, HIROAKIMIZUHARA, YOUJI
Owner NIPPON STEEL & SUMITOMO METAL CORP
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