Hot-dip galvanized steel sheet and method for producing the same

A technology of hot-dip galvanized steel sheet and hot-dip galvanizing, which is applied in the direction of hot-dip galvanizing process, manufacturing tools, chemical instruments and methods, etc., can solve problems such as material degradation, and achieve the effect of excellent hydrogen embrittlement resistance

Active Publication Date: 2022-08-05
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the production method as described above, since martensite and bainite are excessively tempered in the plating alloying treatment process, there is a problem of material deterioration.

Method used

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  • Hot-dip galvanized steel sheet and method for producing the same
  • Hot-dip galvanized steel sheet and method for producing the same
  • Hot-dip galvanized steel sheet and method for producing the same

Examples

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Embodiment

[0246] Next, examples of the present invention will be described. The conditions in the examples are an example of conditions adopted in order to confirm the practicability and effects of the present invention. The present invention is not limited to this one condition example. The present invention can adopt various conditions as long as the object of the present invention can be achieved without departing from the gist of the present invention.

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Abstract

The present invention provides a hot-dip galvanized steel sheet having a hot-dip galvanized layer on at least one surface of a base material steel sheet of the hot-dip galvanized steel sheet, and a method for producing the same, wherein the base material steel sheet has a predetermined composition so as to The integral rate meter contains: ferrite: 0% to 50%, retained austenite: 0% to 30%, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite Total with cementite: 0% to 5%, in the case of residual structure, the residual structure is composed of bainite, and the concentration of B atoms at the prior austenite grain boundary is 2.0 atomic% or more, and The average effective crystal grain size is 7.0 μm or less.

Description

technical field [0001] The present invention relates to a hot-dip galvanized steel sheet and a manufacturing method thereof, and mainly relates to a high-strength hot-dip galvanized steel sheet formed into various shapes by stamping or the like as a steel sheet for automobiles and a manufacturing method thereof. Background technique [0002] In recent years, from the viewpoint of limiting the amount of greenhouse gas emissions associated with global warming countermeasures, there has been a demand to improve the fuel efficiency of automobiles, and high-strength steel sheets have been widely used in order to reduce vehicle body weight and ensure crash safety. Especially recently, the demand for ultra-high-strength steel sheets having a tensile strength of 980 MPa or more has been increasing. In addition, high-strength hot-dip galvanized steel sheets with hot-dip galvanized surfaces are also required for parts of the vehicle body where rust resistance is required. [0003] Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60C23C2/02C23C2/06C23C2/28C23C2/40
CPCC23C2/02C23C2/06C23C2/28C23C2/40C22C38/60C23C2/12C22C38/02C22C38/04C22C38/12C22C38/18C22C38/22C22C38/26C22C38/34C22C38/38C22C38/002C22C38/32C22C38/14C22C38/28C22C38/08C22C38/16C22C38/008B32B15/013C21D2211/008C21D2211/005C21D2211/001C21D2211/009C21D2211/003C21D2211/002C21D8/021C21D8/0226C21D8/0263C21D1/26C21D1/78C21D8/0236C21D9/46C21D6/005C23C2/0224C22C38/58C22C38/50C22C38/54C22C38/46C22C38/48C22C38/42C22C38/52C22C38/44B21C47/02C22C38/001C22C38/005C22C38/06
Inventor 横山卓史川田裕之林邦夫山口裕司内田智史
Owner NIPPON STEEL CORP
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