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A Method for Eliminating Defects of 590mpa Duplex Steel Hot Coil Flat Coil

A dual-phase steel and flat coil technology, applied in the field of steel rolling, can solve problems such as flat coil defects

Active Publication Date: 2020-07-17
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for eliminating the defects of 590Mpa-level dual-phase steel hot coils and flat coils, and solves the technical problem that 590Mpa-level dual-phase steel hot coils are prone to produce flat coil defects in the prior art

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  • A Method for Eliminating Defects of 590mpa Duplex Steel Hot Coil Flat Coil
  • A Method for Eliminating Defects of 590mpa Duplex Steel Hot Coil Flat Coil
  • A Method for Eliminating Defects of 590mpa Duplex Steel Hot Coil Flat Coil

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Embodiment Construction

[0022] The embodiments of the present application provide a method for eliminating defects in flat coils of hot coils of 590Mpa dual-phase steel to solve the technical problem in the prior art that hot coils of 590Mpa dual-phase steel are prone to defects in flat coils.

[0023] In order to solve the above technical problems, the general idea of ​​the technical solution provided by the embodiment of the present application is as follows:

[0024] With the rolling process of the hot-rolled strip steel, the temperature of the strip steel gradually decreases, and the austenite gradually transforms into other structures with lower phase transition temperatures, some of which have very low phase transition temperatures, which will lead to After coiling, a certain degree of phase change process is still maintained, resulting in a local uneven temperature field, resulting in uneven thermal expansion of the hot-rolled coil due to uneven heating, resulting in the volume expansion of the...

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Abstract

The invention belongs to the technical field of rolling steel, and discloses a method for eliminating a flat coil defect of a 590Mpa dual-phase steel hot coil. The method includes controlling the hotrolling finishing temperature according to the ferritiszation phase transition starting temperature of austenite to promote transformation of the austenite into ferrite; dividing a hot rolling coolingsection into a fast cooling section and a slow cooling section and cooling a hot rolled plate to the cold intermediate temperature in the fast cooling section to promote transformation of the austenite to the ferrite and promote transformation of the austenite to pearlite in the slow cooling section. According to the method, high proportion transformation of the austenite to the ferrite and the perarlite with higher stability in the rolling process is achieved by finishing temperature control and subsection cooling and cooling target temperature control, the ratio of the residual austenite isreduced, so that phase change expansion caused by transformation of the austenite to bainite in the hot coil cooling process and the corresponding flat coil defect are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for eliminating defects of 590Mpa dual-phase steel hot coil flat coils. Background technique [0002] 590Mpa grade dual-phase steel is a kind of high-strength steel. Its microstructure is characterized by the coexistence of ferrite and martensite, and is composed of ferrite soft phase and more than 20% martensite hard phase. After the rolled plate coil is unloaded from the coiler, the shape of the hot coil is good at this time, but after a few days of storage, flat coils often appear, also known as the phenomenon of collapse, and the steel coil changes from round at the end of coiling to The oval shape makes the subsequent cold rolling process unable to be rolled smoothly. Contents of the invention [0003] The invention provides a method for eliminating defects in hot coils of 590Mpa dual-phase steel hot coils, and solves the technical problem in the prior art ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04
CPCC21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04
Inventor 陈瑾焦会立商光鹏王明哲张誉公杨华辛艳辉刘丰
Owner BEIJING SHOUGANG CO LTD
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