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HRB600E general-speed hot-rolled ribbed steel bar with a strength-to-yield ratio greater than 1.26 and its production method

A technology of hot-rolled ribbed steel bars, production methods, applied in the field of metallurgy

Active Publication Date: 2022-04-29
广西柳钢华创科技研发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a HRB600E normal-speed hot-rolled ribbed steel bar with a yield ratio greater than 1.26 and a production method thereof to solve the problem of the HRB600E ordinary hot-rolled ribbed steel bar with a yield ratio R° m / R° eL Questions below 1.25

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  • HRB600E general-speed hot-rolled ribbed steel bar with a strength-to-yield ratio greater than 1.26 and its production method
  • HRB600E general-speed hot-rolled ribbed steel bar with a strength-to-yield ratio greater than 1.26 and its production method

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Embodiment Construction

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention is now described.

[0022] This application is applicable to ordinary bars, and the finish rolling speed is relatively slow. According to different specifications, the finish rolling speed (the exit speed of the finishing rolling unit of hot continuous rolling) is only 1 / 3 to 1 / 2 of high-speed bars. At the same time, due to the different production lines, more alloys need to be added to achieve the same performance, and the specifications that can be produced are more than high-speed bars.

[0023] The principle of the invention is: improve the hardenability of the steel in composition design to shift the CCT curve of the steel to the right, and use the controlled rolling and controlled cooling process to refine the crystal grains in the steel rolling process and control the formation of bainite structure. The stronger controlled rolli...

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Abstract

The invention provides a HRB600E normal-speed hot-rolled ribbed steel bar with a yield ratio greater than 1.26 and a production method thereof. The production method of the HRB600E normal-speed hot-rolled ribbed steel bar with a yield ratio greater than 1.26 comprises the following steps: Process stage: blast furnace hot metal smelting, hot metal desulfurization pretreatment, converter molten steel smelting, LF refining, billet continuous casting, hot continuous rolling, cut-to-length cutting and inspection; the temperature control in hot continuous rolling is: control the casting slab heating temperature to 1150-1200°C, billet heating time 60-90 minutes, rolling start temperature 1020-1080°C. Normal speed hot-rolled ribbed steel bar adopts the above-mentioned production method.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a normal-speed or ordinary hot-rolled ribbed steel bar, especially a HRB600E normal-speed hot-rolled ribbed steel bar with a strength-to-yield ratio greater than 1.26 and a production method thereof. Background technique [0002] Strength-to-yield ratio R°m / R°e of HRB600E seismic reinforcement in China Iron and Steel Industry Association group standard T / CISA 026—2020 "HRB600E seismic hot-rolled ribbed steel bar for reinforced concrete" L The requirement is greater than or equal to 1.25, but HRB600E ordinary hot-rolled ribbed steel bars often have a strength-to-yield ratio R° during normal production m / R° eL Cases below 1.25. [0003] To sum up, there are the following problems in the prior art: HRB600E ordinary hot-rolled ribbed steel bars normally produce strength-to-yield ratio R° m / R° eL lower than 1.25. Contents of the invention [0004] The present invention provides a HR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/08
CPCC22C38/02C22C38/04C22C38/12C22C38/002C21D8/08C21D2211/002C22C38/001Y02P10/20
Inventor 钱学海李西德文震李宗强何维陈学良肖娟蒙曰睿赵贤平廖耀俊温小园
Owner 广西柳钢华创科技研发有限公司
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