Thin steel sheet and plated steel sheet, and manufacturing method of thin steel sheet and plated steel sheet
A manufacturing method and technology for thin steel sheets, which can be used in manufacturing tools, hot-dip plating processes, furnaces, etc., and can solve problems such as poor fatigue properties and practical obstacles.
Active Publication Date: 2021-11-05
JFE STEEL CORP
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Problems solved by technology
[0004] However, such DP steel has a composite structure of a hard phase and a soft phase as its basic structure, so it has a problem of poor fatigue properties, which hinders its practical use in parts that require fatigue properties.
Method used
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Embodiment 1
[0130] Steels having the composition shown in Table 1 were melted in a converter and cast into slabs by continuous casting. The obtained slabs were hot-rolled under the conditions shown in Table 2 to a plate thickness of 3.0 mm. Next, after pickling, it was cold-rolled to a plate thickness of 1.4 mm to manufacture a cold-rolled steel sheet, and it was subjected to annealing. For non-coated steel sheets, continuous annealing lines (CAL) are used for annealing, and for hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets, continuous hot-dip galvanizing lines (CGL) are used for annealing. Table 2 shows the pass-through conditions of CAL and CGL. Regarding the conditions of the hot-dip galvanizing treatment, after dipping the steel sheet in a plating bath with a bath temperature of 475° C., it was pulled up, and various adjustments were made to the deposition amount of the plating layer by gas wiping. In addition, some steel sheets were alloyed under the c...
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Abstract
The object of the present invention is to provide a thin steel sheet having excellent fatigue resistance as a raw material for automobile parts and having a TS of 590 MPa or more, a manufacturing method thereof, a plated steel sheet obtained by coating the above thin steel sheet, and a method for obtaining the above thin steel sheet. A method of manufacturing hot-rolled steel sheets, a method of manufacturing cold-rolled full-hard steel sheets, and a method of manufacturing plated steel sheets required for steel sheets. A thin steel plate characterized by having the following composition: by mass %, C: 0.04% to 0.15%; Si: 0.3% or less; Mn: 1.0% to 2.6%; P: 0.1% or less. , S: not more than 0.01%, Al: not less than 0.01% and not more than 0.1%, N: not more than 0.015% and containing one or both of Ti and Nb in a total of not less than 0.01% and not more than 0.2%, and the balance is composed of Fe and Consists of unavoidable impurities, and has a steel structure as follows: 50% or more of ferrite and 10% or more and 50% or less of martensite in terms of the area ratio relative to the entire steel plate, the standard deviation of the nanohardness of the steel structure 1.50 GPa or less, and the tensile strength of the thin steel sheet is 590 MPa or more.
Description
technical field [0001] The present invention relates to a thin steel sheet, a coated steel sheet, a method for manufacturing a hot-rolled steel sheet, a method for manufacturing a cold-rolled full-hard steel sheet, a method for manufacturing a thin steel sheet, and a method for manufacturing a coated steel sheet. 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, there is an active trend to reduce the weight of the vehicle body itself by increasing the strength of the vehicle body material to achieve thinning. However, increasing the strength of a steel sheet leads to a decrease in ductility, that is, a decrease in formability, and therefore, development of a material having both high strength and high formability has been desired. For such requirements, so far, ferrite-martensitic dual-phase steel (DP steel) has been developed. [0003...
Claims
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IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60C22C18/00C22C18/04
CPCC21D9/46C22C18/00C22C18/04C22C38/00C22C38/14C22C38/60C21D8/0236C21D8/0273C23C2/06C23C2/40C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/26C22C38/28C22C38/38C21D2211/005C21D2211/008C23C2/28C21D8/0226C22C38/22C22C38/24
Inventor 中垣内达也船川义正小野义彦长谷川宽
Owner JFE STEEL CORP