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Hot-rolled complex phase steel plate with good broaching performance and production method thereof

A production method and performance technology, applied in the field of ferrite/bainite multiphase steel and its production, can solve the problems of low strength level, and achieve the effect of reducing the difference in mechanical properties

Inactive Publication Date: 2017-11-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this invention, due to the addition of Cr and Ti elements, the transformation of bainite and martensite at a higher coiling temperature is realized, which is easier to control in actual production, but the strength level of this invention is lower

Method used

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  • Hot-rolled complex phase steel plate with good broaching performance and production method thereof
  • Hot-rolled complex phase steel plate with good broaching performance and production method thereof
  • Hot-rolled complex phase steel plate with good broaching performance and production method thereof

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Embodiment Construction

[0031] The technical problems involved in the present invention are solved by the following technical solutions: a hot-rolled multiphase steel plate with good hole expansion performance and its manufacturing method, the mass percentage of its chemical composition is: C: 0.03%~0.12%, Si: 0.1%~ 0.7%, Mn: 1.2%~2.2%, P≤0.012%, S≤0.005%, Cr: 0.25%~0.70%, V: 0.05%~0.25%, Ti: 0.06%~0.16%, Als: 0.015%~ 0.060%, the rest is Fe and unavoidable impurities. The continuous casting slab with the above composition is heated to 1170-1270°C, and the slab is rolled in multiple passes on the rolling mill. ℃, cooling after rolling is divided into three sections: Section I: Cooling rate: 15~25℃ / s, temperature: 650~700℃; Section II: air cooling: 3~8s; Section III: not less than 30℃ / s The cooling speed is cooled to the coiling temperature of 400-550°C, and then air-cooled to room temperature.

[0032] The following examples are used to specifically illustrate the contents of the present invention, ...

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Abstract

The invention discloses a hot-rolled complex phase steel plate with good broaching performance and a production method thereof. The steel comprises the following chemical components in percentage by mass: 0.03-0.12% of C, 0.1-0.7% of Si, 1.2-2.2% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.25-0.70% of Cr, 0.05-0.25% of V, 0.06-0.16% of Ti, 0.015-0.060% of Als and the balance of Fe and inevitable impurities. The billet is heated to the temperature of 1170-1270 DEG C and subjected to multi-pass rolling, the thickness of intermediate billet is 40mm, the finish rolling total reduction is more than or equal to 85%, the hot-rolled finish rolling temperature is 840-920 DEG C, cooling after rolling is divided into three sections: section I: the cooling rate is 15-25 DEG C per second, and the temperature is reduced to 650-700 DEG C; a section II, air cooling is performed by 3-8 seconds; a section III, the steel is cooled to a coiling temperature of 400-550 DEG C at a cooling rate of not less than 30 DEG C per second, and then air-cooled to a room temperature. The steel plate is applied to the field of automobile making.

Description

technical field [0001] The invention belongs to the technical field of steel production for automobiles, and particularly relates to a ferrite / bainite composite steel with good hole expansion performance produced by controlled rolling and controlled cooling and a production method thereof. Background technique [0002] The R&D and application of advanced high-strength and ultra-high-strength steels is an effective means to realize the lightweight of automobiles. It is in line with the development trend of energy saving, consumption reduction, environmental protection and safety of the new generation of automobiles, and is the leading direction of future material technology development. Advanced high-strength steel can reach 500-1600MPa through the comprehensive application of phase transformation strengthening, fine-grain strengthening and precipitation strengthening through reasonable chemical composition design and controlled cooling control means. High weight reduction po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/14C22C38/18C22C38/02C22C38/04C22C38/06C21D8/02
CPCC22C38/18C21D8/0226C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 张宇时晓光董毅韩斌孙成钱刘仁东徐鑫高磊刘跃华袁皓
Owner ANGANG STEEL CO LTD
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