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Hot-rolled steel sheet and method for manufacturing same

A technology of hot-rolled steel sheet and manufacturing method, which is applied in the direction of metal rolling, manufacturing tools, chemical instruments and methods, etc., to achieve the effect of excellent fatigue strength and low-temperature toughness

Active Publication Date: 2015-12-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, it is well known that grain refinement is effective in improving toughness, so a decrease in aspect ratio may lead to a decrease in the toughness deterioration factor due to shape, but it is accompanied by toughness deterioration due to grain coarsening. Its improvement is limited

Method used

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  • Hot-rolled steel sheet and method for manufacturing same
  • Hot-rolled steel sheet and method for manufacturing same
  • Hot-rolled steel sheet and method for manufacturing same

Examples

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Embodiment

[0163] Examples of the present invention are given below to describe the technical content of the present invention. In addition, the condition of this Example is an example of conditions adopted for confirming the implementability and effect of this invention, and this invention is not limited to this example of conditions. In the present invention, various conditions can be adopted as long as the object of the present invention can be achieved without departing from the gist of the present invention.

[0164] Next, the results of investigations using steels having the composition shown in Table 1 will be described. The steels from A to P shown in Table 1 are examples that satisfy the compositional conditions of the present invention, and the steels from a to j are examples that do not satisfy the compositional conditions of the present invention. In addition, as REM, La and Ce are specifically used.

[0165] After these steels are cast, they are directly heated, or tempora...

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Abstract

　The hot-rolled steel sheet according to the present invention has a composition containing, in terms of percent by mass, 0.01-0.2% of C, 2.5% or less of Si, 4.0% or less of Mn, 0.10% or less of P, 0.03% or less of S, 0.001-2.0% of Al, 0.01% or less of N, and 0.01% or less of O, and containing a total of 0.01-0.30% of one or both of Ti and Nb, the mean effective crystal grain size in a portion 1 / 4 of the sheet thickness is 10 μm or less, the mean effective crystal grain size in a portion at a range of 50 μm from a surface is 6 μm or less, and the structure of the steel sheet is annealed martensite or lower bainite, the total volume fraction thereof being at least 90%.

Description

technical field [0001] The invention relates to a hot-rolled steel plate with a maximum tensile strength of more than 980 MPa, excellent fatigue strength and low-temperature toughness, and a manufacturing method thereof. In particular, it relates to a hot-rolled steel sheet having fatigue strength and low-temperature toughness to withstand use as a member subjected to alternating stress and to be used in an extremely low temperature region, and a method for producing the same. Background technique [0002] In order to suppress the emission of carbon dioxide gas from automobiles, high-strength steel sheets are used to reduce the weight of automobile bodies. In addition, in order to ensure the safety of passengers, in addition to mild steel plates, automobile bodies have also used a large number of high-strength steel plates with a maximum tensile strength of 980 MPa or more. In order to further reduce the weight of automobile bodies in the future, it is necessary to increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B1/26B21B3/00C21D9/46C22C38/14C22C38/58C23C2/06C23C2/40
CPCB21B1/26B21B3/00B32B15/013C21D9/46C22C38/00C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C38/20C22C38/26C22C38/28C22C38/38C22C38/58C21D8/0426C21D8/0473C21D1/20C21D2211/002C21D2211/008Y10T428/12951Y10T428/12972Y10T428/12799B32B15/012C21D6/001C21D6/002C21D6/005C21D6/008C21D8/0226C21D8/0263C22C38/08C23C2/024C23C2/02C23C2/0224C23C30/00C23C30/005B32B15/043B32B15/18C23C2/06
Inventor 首藤洋志东昌史榊原章文神泽佑树木村谦
Owner NIPPON STEEL CORP
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