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Steel sheet and production method for same

A technology of steel plate and plate thickness, applied in the field of steel plate and its manufacturing, can solve the problems of easy fracture, deformation ability (ductility, bendability reduction, etc.), and achieve the effect of excellent strength and impact resistance, lightweight and effective

Active Publication Date: 2021-11-05
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in general, if the strength of the steel plate is increased, the deformability (ductility, bendability, etc.) will decrease, and fracture will easily occur in the local large strain region generated by the impact deformation.

Method used

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  • Steel sheet and production method for same
  • Steel sheet and production method for same
  • Steel sheet and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0264] Next, examples of the present invention will be described, and the conditions in the examples are examples of conditions employed to confirm the practicability and effects of the present invention. The present invention is not limited by this conditional example. The present invention can adopt various conditions without departing from the gist of the present invention and achieving the object of the present invention.

[0265] Molten steels having the chemical compositions shown in Table 1A and Table 1B were cast to manufacture slabs. Next, the cast slab was cooled under the conditions shown in Table 2A to Table 2D, and further, hot rolling and cold rolling were performed under the conditions shown in Table 2A to Table 2D to obtain steel sheets. Then, the steel sheets were heat-treated under the conditions shown in Table 3A to Table 3D.

[0266] The balance in Table 1A and Table 1B is Fe and impurities.

[0267] In Table 2A to Table 2D, "cooling rate 1" represents t...

experiment example 93

[0303] Experimental Example 93 is an example with a low C content, and a sufficient amount of martensite was not obtained. As a result, sufficient tensile strength cannot be obtained.

experiment example 94

[0304] Experimental Example 94 is an example in which the C content is excessive, and retained austenite exists in excess. As a result, sufficient impact resistance cannot be obtained.

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Abstract

A steel sheet has a prescribed chemical composition. A microstructure of the steel sheet is, by volume fraction, 10%-75% ferrite, 20% -90% martensite, 0%-5% retained austenite, a total of 0%-50% bainite and bainitic ferrite, and 0%-5% pearlite. Unrecrystallized ferrite is 0%-25% of the ferrite. Cementite included in the martensite satisfies a prescribed relational expression. The density of transient carbides included in the martensite is at least 1.0*1013 / m3. The density of coarse inclusions that have a circle equivalent diameter of at least 10 micrometers is no more than 0.50 / mm2. The ratio between the maximum value for the Vickers hardness and the minimum value for the Vickers hardness at a plane that is parallel to the surface of the steel sheet and is 1 / 4 of the sheet thickness from the surface of the steel sheet in the sheet thickness direction is no more than 1.40, and the average value of the minimum distance between peaks on a distribution map for the Vickers hardness is no more than 1.00 mm.

Description

technical field [0001] The present invention relates to a steel plate and a manufacturing method thereof. [0002] This application claims priority based on Patent Application No. 2019-075691 filed in Japan on April 11, 2019, the contents of which are cited here. Background technique [0003] In recent years, in automobiles, high-strength steel plates have been widely used in order to reduce the weight of the car body, improve fuel economy and reduce carbon dioxide emissions, and in order to absorb collision energy during collisions and ensure the protection and safety of drivers and passengers. ground use. However, in general, when the strength of a steel sheet is increased, the deformability (ductility, bendability, etc.) decreases, and fracture tends to occur in a local large strain region generated by impact deformation. This becomes an obstacle to weight reduction based on high strength, and various countermeasures have been proposed. [0004] For example, Patent Doc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C22C18/00C22C18/04C22C38/00C22C38/60B22D11/124
CPCC21D9/46C22C38/60C23C2/06B22D11/225C22C38/02C22C38/04C22C38/38C22C38/06C22C38/14C22C38/12C22C38/28C22C38/08C22C38/50C22C38/26C22C38/16C22C38/008C22C38/002C21D8/0226C21D8/0236C21D8/0263C21D8/0273C21D2211/001C21D2211/002C21D2211/003C21D2211/005C21D2211/008C21D2211/009B32B15/013C21D8/021C23C2/40C23C30/00C22C38/58C22C38/46C22C38/42C22C38/44B22D11/124C22C38/001C22C38/005C22C38/48C22C38/54
Inventor 川田裕之
Owner NIPPON STEEL CORP
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