Hot stamp molded article, and method for producing hot stamp molded article

A technology of hot stamping forming, manufacturing method, applied in the direction of manufacturing tools, chemical instruments and methods, furnace types, etc., can solve problems such as difficult to cope with the shape of automobile parts

Active Publication Date: 2014-09-10
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, even with these existing technologies, it is difficult to meet today's demands for further weight reduction of automobiles and further complexity of component shapes.

Method used

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  • Hot stamp molded article, and method for producing hot stamp molded article
  • Hot stamp molded article, and method for producing hot stamp molded article
  • Hot stamp molded article, and method for producing hot stamp molded article

Examples

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Effect test

Embodiment

[0125] After continuous casting of the steel with the composition shown in Table 1 at a casting speed of 1.0 m / min to 2.5 m / min, it is directly or temporarily cooled, and then the slab is heated in a heating furnace according to the conditions in Table 2 according to a conventional method, at a temperature of 910 to 2.5 m / min. Hot rolling was performed at a finish rolling temperature of 930° C. to produce a hot-rolled steel sheet. Then, this hot-rolled steel sheet was coiled at the coiling temperature CT shown in Table 1. Thereafter, pickling is performed to remove scale on the surface of the steel sheet, and the sheet is cold rolled to a thickness of 1.2 to 1.4 mm. At this time, cold rolling was performed so that the value of Formula (E) might become the value shown in Table 5. After cold rolling, annealing was performed at the annealing temperature shown in Table 2 in a continuous annealing furnace. Hot-dip galvanizing is further performed on a part of the steel sheets dur...

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Abstract

When the carbon content, silicon content and manganese content of this hot stamp molded article are expressed as [C], [Si] and [Mn], respectively, in terms of unit mass%, a relationship of (5 × [Si] + [Mn]) / [C] > 11 holds; and the metal structure after hot stamping contains ferrite at 40% to 90% and martensite at 10% to 60% by area ratio, and the sum of the area ratio of ferrite and the area ratio of martensite is at least 60%. Furthermore, the hardness of the martensite, as measured by a nanoindenter, satisfies H2 / H1 < 1.10 and sigmaHM < 20, and TS × lambda, which is the product of the tensile strength (TS) and hole expansion rate (lambda), is at least 50000 MPa.%.

Description

technical field [0001] The present invention relates to a hot-stamped formed body using a cold-rolled steel sheet for hot-stamping excellent in formability after hot-stamping, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. 2012-004550 for which it applied in Japan on January 13, 2012, and uses the content here. Background technique [0003] Currently, steel sheets for automobiles are required to improve their crash safety and reduce their weight. Under such circumstances, hot stamping (also referred to as hot pressing, hot forging, press quenching, press quenching, etc.) has recently attracted attention as a method for obtaining high strength. Hot stamping refers to a forming method in which a steel plate is heated to a high temperature such as 700° C. or higher and then formed by hot rolling to improve the formability of the steel plate. After forming, it is cooled and quenched to obtain a desired mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06B21D22/20C21D1/18C21D8/02C21D9/00C21D9/46C22C38/58C23C2/06C23C2/12C23C2/28
CPCC21D9/46C21D8/0236C22C38/14C23C2/405C22C38/002C23C2/02C22C38/18C23C2/28C23C2/06C23C2/12C22C38/12C21D2211/005C22C38/04C23C2/26C21D2211/008C21D1/673C22C38/06C21D8/0226C22C38/02C21D8/0247C22C38/58C22C38/001C21D8/0273C22C38/00Y10T428/12757Y10T428/12799B32B15/01C21D8/0263C21D2211/001C21D2211/002C21D2211/009C22C38/005C22C38/08C22C38/16C22C38/22C22C38/28C22C38/32C22C38/38C23C2/29C23C2/024C23C2/0224C25D5/36
Inventor 野中俊树加藤敏川崎薰友清寿雅
Owner NIPPON STEEL CORP
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