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Thin steel sheet, plated steel sheet, manufacturing method thereof, and manufacturing method of hot-rolled steel sheet, cold-rolled full-hard steel sheet, and heat-treated sheet

A manufacturing method and technology for hot-rolled steel sheets, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as increased deviation, poor shape, and reduced mass production efficiency, and achieve improved fuel efficiency, in-plane directions The effect of excellent heterosexuality and high utilization value

Active Publication Date: 2021-03-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the yield stress (YP) of the steel plate changes, the deviation from the estimated value to make it constant increases, and shape defects occur. After press forming, it is indispensable to perform sheet metal processing on each shape, which reduces the efficiency of mass production. Significantly reduced

Method used

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  • Thin steel sheet, plated steel sheet, manufacturing method thereof, and manufacturing method of hot-rolled steel sheet, cold-rolled full-hard steel sheet, and heat-treated sheet
  • Thin steel sheet, plated steel sheet, manufacturing method thereof, and manufacturing method of hot-rolled steel sheet, cold-rolled full-hard steel sheet, and heat-treated sheet
  • Thin steel sheet, plated steel sheet, manufacturing method thereof, and manufacturing method of hot-rolled steel sheet, cold-rolled full-hard steel sheet, and heat-treated sheet

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Embodiment

[0162] The composition having the composition shown in Table 1 consists, the remaining amount of steel is smelted by the steel which is made of Fe and the inevitable impurities, and is made into a slab by a continuous casting method. After heat rolling, after hot rolling under the conditions shown in Table 2, the acid washing treatment was carried out, and the No. 1 to 18, 20 to 25, 27, 28, 30 to 35 shown in Table 2 was cooled. Rolled.

[0163] Next, annealing treatment was performed under the conditions shown in Table 2 to obtain a thin steel sheet (a secondary method according to the pre-relief bar).

[0164] Further, a part of the thin steel sheet is plated to obtain a hot-dip galvanized steel plate (GI), alloy hot galvanized steel plate (Ga), electroplated steel plate (EG), hot galvanized-aluminum-magnesium alloy steel plate (ZAM), etc. . Regarding the hot-dip galvanized bath, for GI, the zinc bath containing Al: 0.14 ~ 0.19% by weight is used, and the bath containing Al: 0.14...

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Abstract

The present invention provides a thin steel sheet having a TS of 590 MPa or more, an excellent strength-ductility balance, a low yield ratio, an excellent in-plane anisotropy of YP, and excellent platability. A thin steel plate having a specific composition and having a steel structure that contains predetermined amounts of ferrite and martensite in terms of area ratio, the average grain size of ferrite is 20 μm or less, and the The average size is 15 μm or less, the ratio of the average grain size of ferrite to the average size of martensite (average grain size of ferrite / average size of martensite) is 0.5 to 10.0, and the above-mentioned martensite and The above ferrite hardness ratio (hardness of martensite / hardness of ferrite) is not less than 1.0 and not more than 5.0, and the texture of ferrite is measured by the inverse strength ratio of γ-fibers to α-fibers It is 0.8 or more and 7.0 or less, and the tensile strength 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 heat-treated sheet, a method for manufacturing a thin steel sheet, and a method for manufacturing a coated steel sheet. The thin steel sheet and the like of the present invention can be suitably used as structural members such as automotive parts. Background technique [0002] In recent years, due to the improvement of the awareness of the protection of the global environment, there has been a strong demand for reducing CO emissions from automobiles. 2 Fuel efficiency improvements in emissions. Along with this, there is an active trend of increasing the strength of the body material and reducing the thickness of the body, thereby reducing the weight of the body. However, there is concern about a decrease in ductility due to the incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/06C22C38/60C23C2/02C23C2/06
CPCC23C2/06C21D9/46C22C38/00C22C38/06C22C38/60C21D8/0226C21D8/0236C21D8/0263C21D8/0273C21D8/0426C21D8/0436C21D8/0473C21D8/1244C22C38/02C22C38/04C21D2211/005C21D2211/008C23C2/28C23C2/024C23C2/0224C23C2/02C22C38/001C21D8/0247C22C38/002C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54
Inventor 南秀和船川义正金子真次郎
Owner JFE STEEL CORP
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