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High young's modulus steel plate, zinc hot dip galvanized steel sheet using the same, alloyed zinc hot dip galvanized steel sheet, high young's modulus steel pipe, and method for production thereof

A technology of hot-dip galvanized steel sheet and Young's modulus, which can be used in manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., and can solve problems such as inability to obtain shapes.

Inactive Publication Date: 2007-06-27
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when the load is removed after bending, there is a problem that the steel plate returns to its original shape due to springback, so that the desired shape cannot be obtained.
This phenomenon becomes more pronounced with higher strength, and becomes an obstacle to the application of high-strength steel plates to structural members

Method used

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  • High young's modulus steel plate, zinc hot dip galvanized steel sheet using the same, alloyed zinc hot dip galvanized steel sheet, high young's modulus steel pipe, and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0083] The steel sheet according to the first embodiment contains C: 0.0005% to 0.30%, Si: 2.5% or less, Mn: 2.7 to 5.0%, P: 0.15% or less, S: 0.015% or less, Mo: 0.15% to 1.5% by mass %. %, B: 0.0006 to 0.01%, Al: 0.15% or less; and the balance is composed of Fe and unavoidable impurities. The pole density of either or both of {110} and {110} in the 1 / 8 layer of plate thickness is 10 or more, and the Young's modulus in the rolling direction exceeds 230GPa.

[0084] C is an inexpensive element that increases tensile strength, and its addition amount is adjusted according to the target strength level. When C is less than 0.0005% by mass, not only the steelmaking is technically difficult, but also the cost increases, and the fatigue properties of the weld zone deteriorate. Therefore, the lower limit was determined to be 0.0005% by mass. On the other hand, when the C content exceeds 0.30% by mass, it causes deterioration of formability or impairs weldability. Therefore, the up...

no. 2 Embodiment approach

[0145] The steel sheet of the second embodiment contains C: 0.0005% to 0.30%, Si: 2.5% or less, Mn: 0.1 to 5.0%, P: 0.15% or less, S: 0.015% or less, Al: 0.15% or less in mass % , N: 0.01% or less; and one of Mo: 0.005 to 1.5%, Nb: 0.005 to 0.20%, Ti: 48 / 14×N (mass%) to 0.2%, and B: 0.0001 to 0.01% or Two or more kinds, the total is 0.015 to 1.91% by mass; and the balance is composed of Fe and unavoidable impurities. The pole density of {110} and / or {110} in the 1 / 8th layer of the plate thickness is 10 or more, and the Young's modulus in the rolling direction exceeds 230 GPa.

[0146] Here, the reasons for limiting the steel composition as described above will be described.

[0147] C is an element that increases the tensile strength inexpensively, and its addition amount is adjusted according to the target strength level. When C is less than 0.0005% by mass, not only steelmaking is technically difficult and the cost increases, but also the fatigue properties of the wel...

no. 3 Embodiment approach

[0217] In the third embodiment, a hot-dip galvanized steel sheet having a high Young's modulus, an alloyed hot-dip galvanized steel sheet, a high Young's modulus steel pipe, and a method for producing the same in the first and second embodiments described above An example of .

[0218] The hot-dip galvanized steel sheet includes the high Young's modulus steel sheet of the first and second embodiments, and the hot-dip galvanizing performed on the high Young's modulus steel sheet. The hot-dip galvanized steel sheet is produced by hot-dip galvanizing the annealed hot-rolled steel sheet or the cold-rolled cold-rolled steel sheet obtained in the first and second embodiments described above.

[0219] The composition of the galvanized layer is not particularly limited, and in addition to zinc, Fe, Al, Mn, Cr, Mg, Pb, Sn, Ni, etc. may be added as needed.

[0220] Heat treatment and galvanizing on a continuous hot-dip galvanizing line after cold rolling are also acceptable.

...

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Abstract

An embodiment of a high Young's modulus steel sheet, wherein it has a chemical composition, in mass %, that C: 0.0005 to 0.30 %, Si: 2.5 % or less, Mn: 2.7 to 5.0 %, P: 0.15 % or less, S: 0.015 % or less, Mo: 0.15 to 1.5 %, B: 0.0006 to 0.01%, Al: 0.15 % or less, and the balance: Fe and inevitable impurities.

Description

technical field [0001] The present invention relates to a high Young's modulus steel sheet, a hot-dip galvanized steel sheet using the same, an alloyed hot-dip galvanized steel sheet, a high Young's modulus steel pipe, and methods for producing them. [0002] This application is to Japanese patent application 2004-218132 filed on July 27, 2004, Japanese patent application 2004-330578 filed on November 15, 2004, Japanese patent application 2005-019942 filed on January 27, 2005, 2005 Priority is claimed to Japanese Patent Application No. 2005-207043 filed on July 15, the contents of which are incorporated herein by reference. Background technique [0003] There have been many reports on techniques for increasing Young's modulus. Most of these relate to techniques for increasing Young's modulus in the rolling direction (RD) and in the width direction (TD) perpendicular to the rolling direction (RD). [0004] Patent documents 1 to 9 etc. all disclose that by α+γ 2 A technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/12C22C38/58C21D9/46
Inventor 杉浦夏子吉永直树樋渡俊二高桥学半谷公司宇野畅芳菅野良一宫坂明博濑沼武秀
Owner NIPPON STEEL CORP
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