Steel sheet

A technology of steel plate and plate thickness, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as reduced weldability

Active Publication Date: 2021-09-28
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the welding of galvanized steel sheets, especially high-strength steel sheets, for example, as described in the following Patent Document 1, a decrease in weldability due to liquid metal embrittlement (LME) cracking may become a problem.

Method used

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Embodiment

[0092]In the process of producing a continuously cast slab having a thickness of 250 mm having the chemical composition shown in Table 1, thread-like iron oxide was added under the conditions shown in Tables 2-1 to 2-3 to obtain A slab with Si oxides distributed in it. In Tables 4-1 to 4-3, those in which thread-like iron oxide was added to the surface layer on one side or those in which thread-like iron oxide was added to the surface layer on both sides were referred to as "positions of the surface layer". The slabs were subjected to hot rolling under the conditions of heating temperature, finish rolling temperature, and coiling temperature shown in Tables 2-1 to 2-3 to obtain hot-rolled steel sheets. For the steel sheet to be made into a cold-rolled steel sheet, after obtaining a hot-rolled steel sheet as described above, pickling and cold rolling with a total reduction ratio of 50% are carried out under the conditions shown in Tables 2-1 to 2-3. annealed. In addition, som...

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Abstract

The present invention relates to a steel sheet which has both shapability and weldability. A steel sheet according to the present invention is characterized in that: Si oxide particles are present at a number density of 3000 to 6000 particles/mm<2> in a surface layer part, which is the region of the steel sheet up to a distance of 30 [mu]m from the surface of the steel sheet in the thickness direction; the natural logarithms of the particle diameters of the Si oxide particles as determined in terms of [mu]m have a mean value of -2.0 to -1.2 and a standard deviation of 0.6 or less; the number of Si oxide particles for which the deviation of the natural logarithms of the particle diameters from the mean value is greater than twice the standard deviation is 5% or less of the total number of Si oxide particles; and the number density of the Si oxide particles is 1000 particles/mm<2> or less at a position corresponding to 1/2 of the thickness of the steel sheet.

Description

technical field [0001] The present invention relates to steel plates. Background technique [0002] In recent years, from the standpoint of improving the fuel efficiency of automobiles, which is related to environmental protection, it has been required to increase the strength and reduce the thickness of steel sheets for automobiles, and to reduce the weight of automobiles. In addition, steel sheets used in automobile parts are required to have excellent formability in order to be formed into various forms. Furthermore, since molded parts are welded in the assembly process of automobiles, good weldability is also important as a criterion for selecting steel sheets used in structural parts of automobiles. [0003] However, in the welding of galvanized steel sheets, especially high-strength steel sheets, for example, as described in Patent Document 1 below, a decrease in weldability due to liquid metal embrittlement (LME) cracking may become a problem. LME cracking is consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60B22D1/00C21D9/46
CPCC21D9/46C22C38/02C22C38/34C22C38/04C22C38/38C22C38/58C22C38/14C22C38/12C22C38/22C22C38/44C22C38/54C22C38/42C22C38/46C22C38/48C22C38/50B22D11/11B22D11/007B22D11/108C23C2/06C23C2/28C23C2/40C21D8/0263C21D8/0236C21D1/20C21D6/02C23C2/29C22C38/60C22C38/001B32B15/013C22C38/002C22C38/06
Inventor 铃木裕也竹田健悟
Owner NIPPON STEEL CORP
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