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High-strength hot-rolled steel sheet and manufacturing method therefor

A technology for a hot-rolled steel sheet and a manufacturing method, applied in the field of high-strength hot-rolled steel sheet and its manufacturing, can solve problems such as toughness and reduced punching workability, achieve excellent punching workability and toughness, reduce costs, and reduce vehicle body weight Effect

Active Publication Date: 2016-11-09
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, as the strength of the steel sheet increases, the toughness and punchability generally decrease

Method used

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  • High-strength hot-rolled steel sheet and manufacturing method therefor
  • High-strength hot-rolled steel sheet and manufacturing method therefor
  • High-strength hot-rolled steel sheet and manufacturing method therefor

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Embodiment

[0110] The molten steel with the composition shown in Table 1 was smelted in a converter, and a billet (steel raw material) was produced by a continuous casting method. During continuous casting, electromagnetic stirring (EMS) was performed on steel plates other than hot-rolled steel plate No. 6' (steel F) in Tables 1 to 3 described later in order to perform component segregation reduction treatment. Next, these raw steel materials were heated under the conditions shown in Table 2, and subjected to hot rolling including rough rolling and finish rolling under the conditions shown in Table 2. After finish rolling, cooling and coiling were performed under the conditions shown in Table 2 to produce hot-rolled steel sheets with thicknesses shown in Table 2. Test pieces were taken from the hot-rolled steel sheets obtained above, and microstructure observations, tensile tests, Charpy impact tests, and punching tests were performed. The tissue observation method and various test meth...

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Abstract

Provided are: a high-strength hot-rolled steel sheet having excellent punchability and toughness; and a manufacturing method therefor. The present invention comprises C: 0.060-0.140% inclusive, Si: 1.00% or less, Mn: 1.30-2.50% inclusive, P: 0.030% or less, S: 0.0050% or less, Al: 0.070% or less, N: 0.010% or less, Ti: 0.060-0.140% inclusive, Cr: 0.10-0.50% inclusive, B: 0.0002-0.0020% inclusive, 5.0<=18C+Mn+1.3Cr+1500B<=6.0, with the remainder comprising Fe and unavoidable impurities. The present invention includes a bainite phase having a main phase in an area ratio exceeding 90% or further includes one or more from among a ferrite phase, a martensite phase, and a residual austenite phase in an area ratio of less than 10% total. The average particle size of the bainite phase is 2.5 [mu]m or less, and Fe-based carbide intervals precipitating in bainitic ferrite particles in the bainite phase are 600 nm or less.

Description

technical field [0001] The invention relates to a high-strength hot-rolled steel plate and a manufacturing method thereof. The high-strength hot-rolled steel plate has a tensile strength of more than 980 MPa, and is suitable for use as structural components, skeleton components, suspension components and other running parts of automobiles, and trucks. Raw materials for frame parts and steel pipes, etc. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, regulations on exhaust gas from automobiles have been strengthened. In addition, the increase in fuel consumption of automobiles has become an important issue. Therefore, further high strength and thinner walls are required for the materials used. Along with this, high-strength hot-rolled steel sheets are actively used as raw materials for automobile parts. The high-strength hot-rolled steel sheet is not only used in structural members and skeleton members of automobiles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/38C22C38/58
CPCC22C38/38C22C38/005C22C38/04C22C38/12C22C38/14C21D8/0226C21D8/0263C21D8/105C21D2211/002C21D2211/004C21D1/02C21D1/20C21D9/46C21D8/0221C21D8/0247C21D2211/001C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/42C22C38/50C22C38/54C22C38/58
Inventor 山崎和彦奥田金晴
Owner JFE STEEL CORP
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