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High-strength steel sheet and method for producing same

A technology of high-strength steel plate and manufacturing method, which is applied in the direction of manufacturing tools, coatings, furnace types, etc., can solve the problems of inability to use walking parts, etc., and achieve the effect of improving reliability and remarkable effect.

Active Publication Date: 2017-11-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steel sheets with insufficient stretch flangeability cannot be applied to running parts that require flange forming, etc.

Method used

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  • High-strength steel sheet and method for producing same
  • High-strength steel sheet and method for producing same
  • High-strength steel sheet and method for producing same

Examples

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Effect test

Embodiment

[0104] A steel raw material with a wall thickness of 250mm having the composition shown in Table 1 is made into a hot-rolled steel sheet under the hot rolling process conditions shown in Table 2 (the conditions for rough rolling are omitted), and the rolling ratio is 40% or more and 65% or less cold rolling to make the plate thickness 1.0-2.0mm, use the continuous annealing production line or continuous hot-coating production line to process under the annealing process conditions shown in Table 2, and then perform the tempering process conditions as shown in Table 2 Tempering is carried out to obtain cold-rolled steel sheets. In addition, the average cooling rate of the hot rolling process of Table 2 is the average cooling rate from the finish temperature of finish rolling to 580 degreeC. In addition, in the temperature range from the Ms transformation point to (Ms transformation point-200)°C in the annealing process, the average cooling rate shown in the average cooling rate ...

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Abstract

Provided is a high-strength steel sheet having: an element composition that includes, in mass%, C: 0.09-0.17% of C, Si: 0.6-1.7% of Si, 3.5% or less of Mn, 0.03% or less of P, 0.005% or less of S, 0.08% or less of Al, 0.006% or less of N, 0.05% or less of Ti, and 0.0002-0.0030% of B, the balance being Fe and unavoidable impurities; and a steel sheet structure that includes, in area percentage, less than 20% (including 0%) of a ferrite phase, 75% or more (including 100%) of a tempered martensite phase, 10% or less (including 0%) of a non-tempered martensite phase, and less than 5% (including 0%) of a residual austenite phase, the Vickers hardness of the tempered martensite phase being 280-340, and the tensile strength of the sheet being 950-1,120 MPa.

Description

technical field [0001] The invention relates to a high-strength steel plate and a manufacturing method thereof. The high-strength steel sheet of the present invention is useful for automotive components. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, to limit CO 2 Emissions are aimed at improving the fuel efficiency of vehicles throughout the automotive industry. To improve the fuel efficiency of automobiles, the weight reduction of automobiles by thinning the parts used is the most effective. Therefore, in recent years, the usage of high-strength steel sheets as raw materials for automobile parts has been increasing. [0003] On the other hand, the formability of steel sheets tends to deteriorate as the strength increases. Therefore, there is a demand for a steel plate that is excellent in formability in addition to high strength. A steel plate with insufficient stretch flangeability cannot be applied to running p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60C23C2/06C23C2/28C23C2/40C22C18/00
CPCC23C2/06C23C2/28C23C2/40C22C18/00C22C38/00C22C38/14C22C38/60C21D9/46C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D8/0263C21D8/0278C22C18/04C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/12C21D1/18C21D8/0247C21D2211/008
Inventor 高坂典晃船川义正樱井理孝铃木克一
Owner JFE STEEL CORP
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