Unlock instant, AI-driven research and patent intelligence for your innovation.

Slit steel bar with small performance line difference

A technology of steel bar and line difference, which is applied in the field of segmented steel bar, and can solve the problems of large line difference of mechanical properties of each line of steel bar and fluctuation of steel bar performance

Active Publication Date: 2020-12-29
LIUZHOU IRON & STEEL
View PDF19 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a split steel bar with small performance line difference to solve the problems of performance fluctuation of the steel bar between the split lines and large line difference of the mechanical properties of each line of the steel bar

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Slit steel bar with small performance line difference
  • Slit steel bar with small performance line difference
  • Slit steel bar with small performance line difference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 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:

[0067] 1) Billet smelting composition control: carbon: 0.24%, silicon: 0.55%, manganese: 1.34%, phosphorus: 0.023%, sulfur: 0.028%, niobium: 0.025%;

[0068] 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;

[0069] 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

[0078] 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:

[0079] 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%

[0080] 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;

[0081] 3) The heating time of the billet in the furnace is 62min, 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 the pass system are adopted, and the rolling speed of the finished stand is controlled at 13m / s, upper cooling bed temperature ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a slit steel bar with small performance line difference. The slit steel bar comprises the components of 0.18% - 0.25% of carbon, 0.20% - 0.80% of silicon, 1.20% - 1.60% of manganese, less than or equal to 0.0045% of phosphorus and less than or equal to 0.0045% of sulfur; and after slitting, the weight deviation of steel bars in a middle line is 2.5% - 3.5% larger than that of steel bars in two side lines. According to the slit steel bar with the small performance line difference, the performance fluctuation of the slitting lines is reduced, and the performance stabilityof the steel bars is improved.

Description

technical field [0001] The invention relates to the field of steel rolling, in particular to a steel bar with reduced mechanical property line difference of each line after splitting, that is, a split steel bar with small performance line difference. 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 process for production, especially for small-sized steel bars...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/18C22C38/02C22C38/04C22C38/12
CPCB21B1/18C22C38/02C22C38/04C22C38/002C22C38/12C22C38/001
Inventor 何维邓深樊雷钱学海李崇赵贤平廖耀俊庞锐
Owner LIUZHOU IRON & STEEL