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High-strength hot-dip galvanized steel sheet with excellent processability and process for producing the same

A technology of excellent workability, hot-dip galvanized steel sheet, applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as strength and ductility that cannot be said to be obtained, achieve excellent deep drawing, improved impact stability, Excellent stretch flangeability

Active Publication Date: 2010-12-29
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the tensile strength is about 600 MPa, and the balance of tensile strength and elongation (TS×EL) is about 19000 MPa·%, so it cannot be said that sufficient strength and ductility have been obtained.

Method used

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  • High-strength hot-dip galvanized steel sheet with excellent processability and process for producing the same
  • High-strength hot-dip galvanized steel sheet with excellent processability and process for producing the same
  • High-strength hot-dip galvanized steel sheet with excellent processability and process for producing the same

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Embodiment

[0106] Steel having the composition shown in Table 1, with the balance consisting of iron and unavoidable impurities was melted in a converter, and cast into billets by continuous casting. The obtained slab was hot-rolled to a plate thickness of 3.0 mm. Hot rolling was carried out at a finishing temperature of 900°C, a cooling rate after rolling of 10°C / sec, and a coiling temperature of 60°C. Next, the hot-rolled steel sheet was pickled and then cold-rolled to a thickness of 1.2 mm to manufacture a cold-rolled steel sheet. In addition, some steel sheets hot-rolled to a plate thickness of 2.3 mm were used for annealing after pickling. Next, the cold-rolled steel sheet or hot-rolled sheet obtained above was annealed under the conditions shown in Table 2 using a continuous hot-dip galvanizing line, hot-dip galvanized at 460°C, and then alloyed at 520°C , and cooled at an average cooling rate of 10°C / sec. In addition, for some steel sheets, hot-dip galvanized steel sheets witho...

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Abstract

A high-strength hot-dip galvanized steel sheet is provided which has a TS of 590 MPa or higher and is excellent in ductility and stretch flangeability. Also provided is a process for producing the steel sheet. The steel sheet has a composition comprising, in terms of mass%, 0.05-0.3% carbon, 0.01-2.5% silicon, 0.5-3.5% manganese, 0.003-0.100% phosphorus, up to 0.02% sulfur, and 0.010-1.5% aluminum, provided that the sum of the silicon and the aluminum is 0.5-2.5%, with the remainder being iron and incidental impurities. The structure thereof comprises, in terms of areal proportion, at least 20% ferrite phase, up to 10% (including 0%) martensite phase, and 10-60% tempered martensite and has, in terms of volumetric proportion, 3-10% retained austenite phase, the retained austenite having anaverage crystal-grain diameter of 2.0 [mu]m or smaller. The retained austenite preferably has an average concentration of carbon in a solid solution state of 1% or higher.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet with excellent workability, which is suitable for components mainly used in industrial fields such as automobiles and electric power, and a method for producing the same. Background technique [0002] In recent years, improving the fuel consumption of automobiles has become an important issue from the viewpoint of protecting the global environment. Accordingly, studies are being actively conducted to reduce the weight of the vehicle body itself by increasing the strength of the vehicle body material to achieve thinning. However, the increase in strength of steel sheets leads to a decrease in ductility, that is, a decrease in formability. Therefore, the development of a material having both high strength and high processability is currently desired. [0003] In addition, recently, the demand for improvement of corrosion resistance of automobiles has increased, and developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/58C21D9/46
CPCC21D2211/008C23C2/02C21D8/0436C22C38/04C22C38/06C21D2211/001C21D8/0447C21D8/0263C22C38/001C21D2211/005C21D1/25C21D9/48C22C38/02C22C38/002C22C38/005C22C38/12C22C38/14C22C38/16C22C38/18C22C38/38Y10T428/12799C23C2/024C23C2/0224
Inventor 中垣内达也松冈才二金子真次郎川崎由康铃木善继
Owner JFE STEEL CORP
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