High-tensile hot-rolled steel sheet and manufacturing method thereof

A hot-rolled steel plate and high-tension technology, which is applied in the direction of manufacturing tools, chemical instruments and methods, heat treatment furnaces, etc., can solve problems such as component distortion, and achieve good processability and excellent material stability

Inactive Publication Date: 2016-01-20
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, if steel plates with different local strengths are press-formed, the amount of springback will change in proportion to the strength, and the parts will be distorted.

Method used

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  • High-tensile hot-rolled steel sheet and manufacturing method thereof
  • High-tensile hot-rolled steel sheet and manufacturing method thereof
  • High-tensile hot-rolled steel sheet and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment

[0102] Molten steel having the composition shown in Table 1 was smelted and continuously cast by a generally known method to produce a billet (steel material) with a wall thickness of 250 mm. After heating these billets to 1250°C, rough rolling and finish rolling were carried out, and after finishing rolling, cooling and coiling were carried out to produce hot-rolled steel sheets with a thickness of 2.3 mm and a width of 1400 mm (hot-rolled numbers in Table 2: 1~24). Table 2 shows the finish rolling temperature, the average cooling rate of cooling (the average cooling rate from the finish rolling temperature to the coiling temperature) and the coiling temperature of the above-mentioned finish rolling.

[0103] Next, a part of the hot-rolled steel sheets (hot-rolled numbers in Table 2: 3, 5, and 15) obtained as above were pickled to remove surface scale, and then annealed (annealing temperature: 680° C., Holding time: 120 seconds), dipped in a hot-dip galvanizing bath (bath co...

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Abstract

The present invention relates to a hot-rolled steel sheet and a manufacturing method thereof. The hot-rolled steel sheet contains: in mass %, C: more than 0.05% and not more than 0.13%, Si: not more than 0.3%, and Mn: not less than 0.5% and 2.0% Below, P: 0.025% or less, S: 0.005% or less, N: 0.0060% or less, Al: 0.1% or less, Ti: 0.07% or more and 0.18% or less, V: more than 0.13% and 0.30% or less, and Ti and V satisfies 0.25<Ti+V≤0.45 (Ti, V: content of each element (mass %)), and solid solution V: 0.05% or more and less than 0.15%, and the balance contains Fe and unavoidable impurities; iron A matrix in which the area ratio of the element phase to the overall structure is 95% or more; and fine carbides containing Ti and V with an average particle size of less than 10 nm are dispersed and precipitated, and the volume ratio of the fine carbides to the overall structure is 0.0050 or more, A structure in which the number of carbides containing Ti and having a particle size of 30 nm or more accounts for less than 10% of the total number of carbides.

Description

technical field [0001] The present invention relates to a tensile strength suitable for raw materials of transportation equipment parts such as automobile parts, structural parts, etc., having excellent processability, especially excellent stretch flangeability and bending properties, and excellent material stability (TS): High-tensile hot-rolled steel sheet of 980 MPa or more and its manufacturing method. Background technique [0002] From the viewpoint of global environmental protection, in order to reduce CO 2 In terms of emissions, it is necessary to reduce the weight of the car body while maintaining the strength of the car body, thereby improving the fuel efficiency of the car, which has become a very important issue in the automotive industry. In order to reduce the weight of an automobile body while maintaining its strength, it is effective to increase the strength of a steel sheet used as a raw material for automobile parts to reduce the thickness of the steel shee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C18/04C22C38/14C22C38/60C23C2/06
CPCC23C2/02C23C2/06C21D9/46C22C18/04C22C38/14C22C38/60B32B15/013C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C21D8/0426C21D8/0463C21D8/0478C21D2211/004C21D2211/005C22C38/002C22C38/008C22C38/08C22C38/10C22C38/16C22C38/24C22C38/26C22C38/28C23C2/024C23C2/0224C21D8/0263
Inventor 有贺珠子船川义正内田康信
Owner JFE STEEL CORP
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