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Hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet

A hot-dip galvanized steel sheet and hot-dip galvanized steel technology are applied in the fields of high-strength hot-dip galvanized steel sheet, high-strength alloyed hot-dip galvanized steel sheet, and high-strength alloyed hot-dip galvanized steel sheet, which can solve the problem of high-strength hot-dip galvanized steel sheet. Problems such as difficulty in chemical conversion, etc., to achieve the effects of excellent impact absorption, excellent press formability, high yield strength and tensile strength

Active Publication Date: 2020-09-18
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in steel sheets, the improvement of uniform ductility and local ductility and high strength, and the improvement of low-temperature impact properties and high strength are all contradictory matters, and it is difficult to realize these matters at the same time.
In addition, steel sheets for automobiles require corrosion resistance, but maintaining the desired corrosion resistance makes it more difficult to increase strength while ensuring ductility and low-temperature impact properties

Method used

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  • Hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet
  • Hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet
  • Hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet

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Embodiment 1

[0201] Molten steel was cast using a vacuum melting furnace, and steels A to U having the component compositions shown in Table 1 were produced. Ac in Table 1 1 point and Ac 3 The points are obtained from thermal expansion changes when the cold-rolled steel sheets of steels A to P are heated at 2°C / sec. Steels A to U were heated to 1200° C. and kept for 60 minutes, and then hot rolled under the hot rolling conditions shown in Tables 2-1 and 2-2.

[0202]

[0203] Specifically, in Ar 3 Steels A to U were subjected to 10-pass rolling in the temperature range above the temperature point to obtain hot-rolled steel sheets with a thickness of 2.5 to 3.0 mm. After hot rolling, the hot-rolled steel plate is cooled to 500-680°C by spraying water, the cooling end temperature is set as the coiling temperature, and the hot-rolled steel plate is loaded into the electric heating furnace kept at the coiling temperature, and kept After 60 minutes, the hot-rolled steel sheet was furnace...

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Abstract

A hot-dip galvanized steel sheet and an alloyed hot-dip galvanized steel sheet exhibiting an improved uniform ductility and local ductility, an improved yield strength and tensile strength, and improved low-temperature impact properties are characterized by having a prescribed component composition, and are characterized in that the metallographic structure of the steel sheets contains, in volume%, more than 5.0% retained austenite and more than 5.0% tempered martensite, the retained austenite contains at least 0.85 mass% C, and the ratio between the amount of C segregation (number of atoms / nm<2>>), [C]gamma gb and the amount of P segregation (number of atoms / nm<2>), [P]gamma gb at the prior austenite grain boundaries, i.e. [C]gamma gb / [P]gamma gb is at least 4.0.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet suitable for press forming and a high-strength alloyed hot-dip galvanized steel sheet, in particular to a high-strength hot-dip galvanized steel sheet excellent in ductility and low-temperature impact properties and a high-strength alloyed hot-dip galvanized steel sheet. Dip galvanized steel sheet. Background technique [0002] Today, after the industrial technology field is highly differentiated, special and high-performance materials are being sought in each technical field. Regarding steel sheets for automobiles, in order to improve fuel efficiency by reducing the weight of the vehicle body, it is required to increase both the yield strength and the tensile strength. [0003] If a high-strength steel sheet is applied to a vehicle body, it is possible to impart desired strength to the vehicle body while reducing the weight of the vehicle body by reducing the thickness of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/58C21D9/46C23C2/06
CPCC22C38/00C23C2/06C22C38/58C21D9/46C22C38/06C22C38/002C22C38/38C22C38/08C22C38/32C22C38/22C21D6/002C21D6/005C22C38/16C22C38/001C22C38/02C21D6/008C22C38/005C22C38/14B32B15/013C23C2/40C23C2/28C23C2/02C23C2/29C23C2/0224C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C21D8/0247C21D2211/008C21D2211/001C22C38/26B32B15/04C23C30/005C22C38/34B32B15/043C22C38/24C23C30/00C21D8/0226C23C28/3225C21D8/0205C21D8/0221C22C38/12C21D8/0268C23C28/025C22C38/20C22C38/18C21D8/0236C22C38/40C22C38/28C21D8/0231C22C38/04C21D8/005B32B15/18Y10T428/12972Y10T428/12951Y10T428/12958Y10T428/12979Y10T428/12799Y10T428/12965
Inventor 芳贺纯佐野幸一林宏太郎林邦夫龟田正春上西朗弘川田裕之
Owner NIPPON STEEL CORP
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