High-strength steel plate with excellent formability and stability of material properties, and method for manufacturing same

A technology of high-strength steel plate and manufacturing method, applied in chemical instruments and methods, manufacturing tools, hot-dip plating process, etc., can solve the problems of insufficient total elongation, difficulty in ensuring strength, etc., and achieve hole expandability and material stability. Excellent effect, improved fuel efficiency, and high utility value

Active Publication Date: 2014-01-08
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since it is a structure containing a lot of bainite or martensite tempered at a high temperature, it is difficult to sec

Method used

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  • High-strength steel plate with excellent formability and stability of material properties, and method for manufacturing same
  • High-strength steel plate with excellent formability and stability of material properties, and method for manufacturing same
  • High-strength steel plate with excellent formability and stability of material properties, and method for manufacturing same

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[0101] Example

[0102] The steel having the composition shown in Table 1 and the balance consisting of Fe and unavoidable impurities was smelted in a converter, and a cast piece was produced by a continuous casting method. The obtained cast slab was heated to 1250°C and hot rolled to a plate thickness of 3.2 mm. Hot rolling is performed under the conditions of a finishing rolling temperature of 900°C, a cooling rate after rolling of 10°C / sec, and a coiling temperature of 600°C. After pickling the hot-rolled steel sheet, it was cold-rolled to a thickness of 1.4 mm, and then annealed under the manufacturing conditions shown in Table 2. One part is then subjected to hot-dip galvanizing, hot-dip galvanizing, alloying of the hot-dip galvanized layer, and hot-dip aluminum. Nos. 35, 38, and 44 are hot-dip galvanized steel sheets, No. 36, 39, 41 to 43, and 47 are alloyed hot-dip galvanized steel sheets, and No. 37, 40, and 46 are hot-dip galvanized steel sheets.

[0103] The hot-dip ga...

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Abstract

Provided is a high-strength steel plate having excellent hole expandability as well as stability of material properties, and a method for manufacturing the same, the high-strength steel plate having a TS of at least 780 MPa and a TS*EL of at least 22,000 MPa DEG % in a low-C steel composition. The high-strength steel plate having excellent formability and stability of material properties has an ingredient composition including, in terms of mass%, 0.03%-0.25% C, 0.4%-2.5% Si, 3.5%-10.0% Mn, 0.1% or less P, 0.01% or less S, 0.01%-2.5% Al, 0.008% or less N, and Si+Al at least 1.0%, the remainder being Fe and unavoidable impurities, the steel structure having, by area ratio, 30%-80% ferrite, 0%-17% martensite, and, by volume ratio, 8% or more of residual austenite, and the average crystalline particle diameter of the residual austenite being 2[mu]m or less.

Description

technical field [0001] The present invention relates to a high-strength steel sheet which is suitable as a component used in industrial fields such as automobiles and electric appliances and has excellent workability and material stability, and a method for producing the same. Background technique [0002] In recent years, improving the fuel efficiency of automobiles has become an important issue from the viewpoint of protecting the global environment. Therefore, studies on reducing the weight of the vehicle body itself by reducing the thickness of the vehicle body itself by increasing the strength of the vehicle body material have been active. However, since the increase in the strength of the steel sheet leads to a decrease in formability, it is currently desired to develop a material having both high strength and high formability. In addition, when high-strength steel sheets are formed into complex shapes such as automobile parts, cracks or necking at protruding parts or...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D9/46C22C38/06C22C38/58
CPCC21D2211/008C22C38/04C23C2/12C23C2/40C21D9/46C22C38/001B32B15/013C22C38/06C21D6/005C21D2211/005C22C38/38C22C38/14B32B15/012C23C2/02C23C2/28C21D2211/001C23C2/06C22C38/005C22C38/12C21D8/0263C22C38/002C22C38/02C22C38/16C22C38/08C22C38/24C22C38/00Y10T428/12799Y10T428/12757C23C2/024C23C2/0224C22C38/58
Inventor 川崎由康长谷川宽金子真次郎长泷康伸
Owner JFE STEEL CORP
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