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Production method for reducing rebar performance line difference

A production method and technology for steel bars, applied in the direction of metal rolling, etc., can solve the problems of fluctuations in the performance of steel bars and large differences in the mechanical properties of each line of steel bars.

Active Publication Date: 2020-12-29
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a production method for reducing the performance line difference of steel bars, so as to solve the problems of fluctuations in the performance of steel bars between the cutting lines and large line differences in the mechanical properties of each line of steel bars

Method used

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  • Production method for reducing rebar performance line difference
  • Production method for reducing rebar performance line difference
  • Production method for reducing rebar performance line difference

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Effect test

Embodiment 1

[0061] According to the GB / T1499.2-2018 standard, it is applied to the Φ12mm and HRB400E steel bars produced by the four-cutting process. The specific steps are as follows:

[0062] 1) Billet smelting composition control: carbon: 0.24%, silicon: 0.55%, manganese: 1.34%, phosphorus: 0.023%, sulfur: 0.028%, niobium: 0.025%;

[0063] 2) The pass design and production requirements of the pre-cut hole K4, the split hole K3, the finished front hole K2 and the finished hole K1 in the rolling process: the inner diameter of the middle two holes of the four-segmented hole is enlarged by 3% compared with the holes on both sides;

[0064] 3) The heating time of the steel billet in the furnace is 65min, using three-stage heating, the temperature in the soaking section is controlled at 1150±40°C, the starting rolling temperature is 1050°C, the four-cutting process and the pass system are adopted, and the rolling speed of the finished stand is controlled at 13m / s, upper cooling bed temperatu...

Embodiment 2

[0073] It is applied in the Φ18mm and HRB400E steel bars produced by Liuzhou Steel according to the GB / T1499.2-2018 standard and the three-cut process. The specific steps are:

[0074] 1) Billet smelting composition control: carbon: 0.23%, silicon: 0.46%, manganese: 1.44%, phosphorus: 0.026%, sulfur: 0.027%, vanadium: 0.026%, nitrogen: 0.0088%

[0075] 2) The pass design and production requirements of the pre-cut hole K4, the split hole K3, the finished front hole K2 and the finished hole K1 in the rolling process: the inner diameter of the three-segmented middle hole is enlarged by 3% compared with the holes on both sides;

[0076] 3) The heating time of the steel billet in the furnace is 62 minutes, using three-stage heating, the temperature of the soaking section is controlled at 1150±40°C, the starting rolling temperature is 1060°C, the three-cut process and pass system are adopted, and the rolling speed of the finished stand is controlled at 13m / s, upper cooling bed tempe...

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Abstract

The invention provides a production method for reducing a rebar performance line difference. The production method for reducing the rebar performance line difference comprises the following steps of:A, controlling the components of a rebar blank: 0.18 percent to 0.25 percent of carbon, 0.20 percent to 0.80 percent of silicon, 1.20 percent to 1.60 percent of manganese, less than or equal to 0.0045percent of phosphorus and less than or equal to 0.0045 percent of sulfur; and B, adopting a three-slitting or four-slitting process for rolling of rebars with the specification of phi 12 mm to phi 20mm, wherein in the three-slitting or four-slitting process, the hole pattern design and manufacturing requirements of a pre-slitting hole K4, a slitting hole K3, a finished product front hole K2 anda finished product hole K1 are as follows: in all the hole patterns, the hole inner diameter of a middle hole is increased by 3 percent than the inner diameters of two side holes. According to the production method for reducing the rebar performance line difference provided by the invention, the performance fluctuation of each slitting line is reduced, and the performance stability of the rebars is improved.

Description

technical field [0001] The invention relates to the field of steel rolling, in particular to a production method for reducing the line difference of mechanical properties of each line after the steel bar is cut, that is, a production method for reducing the line difference of the performance of the steel bar. Background technique [0002] In order to increase the output and production efficiency of small-sized steel bars, and realize energy saving and consumption reduction, the split rolling technology is mostly used in the production of steel bars. At present, domestic steel bars with specifications of φ25 mm and below tend to be produced in two-cut, three-cut, four-cut and other cutting methods according to different specifications. The output of steel bars produced by cutting technology can be increased by 10-30%. Corresponding At the same time, the energy consumption can be reduced by 10-20%. Therefore, the domestic production of steel bars generally adopts the cutting p...

Claims

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Application Information

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IPC IPC(8): B21B1/18C22C38/02C22C38/04C22C38/12
CPCB21B1/18C22C38/02C22C38/04C22C38/002C22C38/12C22C38/001Y02P10/20
Inventor 何维邓深樊雷钱学海李崇赵贤平廖耀俊庞锐
Owner LIUZHOU IRON & STEEL