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Novel hot-rolled steel bar production process

A production process and steel bar technology, applied in the field of new hot-rolled steel bar production process, can solve the problems of steel bar deformation, stability, fatigue resistance, cooling liquid cannot be replaced in time, gas cannot be recycled, etc., to ensure performance and avoid waste gas Influence, the effect of easy disassembly

Pending Publication Date: 2022-04-12
云南玉溪玉昆钢铁集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hot-rolled steel bars are finished steel bars that have been hot-rolled and naturally cooled. They are made of low-carbon steel and ordinary alloy steel at high temperatures. They are mainly used for reinforcement of reinforced concrete and prestressed concrete structures. They are used in civil engineering One of the most used types of steel, hot-rolled steel bars should have a certain strength, that is, yield point and tensile strength, which are the main basis for structural design. Hot-rolled steel bars are soft and rigid, and necking occurs when they break. Cooling and shaping after rolling can effectively avoid the deformation of hot-rolled steel bars. Hot-rolling is a common processing method for non-ferrous metals. The temperature of hot-rolling is higher than the recrystallization temperature just now, and the rolling temperature is higher. Cool the steel bar to avoid the deformation of the steel bar and affect the performance of the steel bar. When the existing cooling equipment is in use, the residual stress is often generated inside the steel plate due to uneven heat dissipation at various parts, which affects the deformation, stability, and fatigue resistance of the steel bar. All aspects are affected, and the gas generated during the cooling process cannot be recovered, the cooling liquid cannot be replaced in time, and there are many inconveniences in operation

Method used

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  • Novel hot-rolled steel bar production process
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The steps of the novel hot-rolled steel bar production process mainly include:

[0043] (1) Continuous casting slab heating: The continuous casting slab enters the heating furnace for heating:

[0044](2) Forming: a forming mold is set in the heating furnace, and the heated continuous casting slab is formed through the forming mold;

[0045] (3) Phosphorus removal: the formed continuous casting slab enters the high-pressure phosphorus removal box for phosphorus removal operation;

[0046] (4) Rough rolling: the continuous casting slab after dephosphorization is sent into the rolling mill for rolling, and the rolling mill is rolled into an intermediate slab 5 times;

[0047] (5) Finish rolling: the intermediate body passes through the head cutting, flying and cutting off the head, and then enters the finish rolling descaling box, and the intermediate billet after dephosphorization is sent to the finish rolling unit for rolling, and the finish rolling unit rolls 3 times;...

Embodiment 2

[0055] (1) Continuous casting slab heating: The continuous casting slab enters the heating furnace for heating:

[0056] (2) Forming: a forming mold is set in the heating furnace, and the heated continuous casting slab is formed through the forming mold;

[0057] (3) Phosphorus removal: the formed continuous casting slab enters the high-pressure phosphorus removal box for phosphorus removal operation;

[0058] (4) Rough rolling: the continuous casting slab after dephosphorization is sent into the rolling mill for rolling, and the rolling mill is rolled into an intermediate billet through 6 times;

[0059] (5) Finish rolling: the intermediate body is cut and cut off the head, and then enters the finish rolling descaling box, and the intermediate billet after dephosphorization is sent to the finish rolling unit for rolling, and the finish rolling unit rolls 5 times;

[0060] (6) Stretching: After the intermediate body after finishing rolling is left still, stretching is carried...

Embodiment 3

[0065] (1) Continuous casting slab heating: The continuous casting slab enters the heating furnace for heating:

[0066] (2) Forming: a forming mold is set in the heating furnace, and the heated continuous casting slab is formed through the forming mold;

[0067] (3) Phosphorus removal: the formed continuous casting slab enters the high-pressure phosphorus removal box for phosphorus removal operation;

[0068] (4) Rough rolling: the continuous casting slab after dephosphorization is sent into the rolling mill for rolling, and the rolling mill is rolled into an intermediate slab 4 times;

[0069] (5) Finish rolling: the intermediate body is cut and cut off the head, and then enters the finish rolling descaling box, and the intermediate billet after dephosphorization is sent to the finish rolling unit for rolling, and the finish rolling unit rolls 4 times;

[0070] (6) Stretching: After the intermediate body after finishing rolling is left still, stretching is carried out by st...

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Abstract

The invention relates to a novel hot-rolled steel bar production process, and belongs to the technical field of steel production, the novel hot-rolled steel bar production process comprises the following steps: heating a continuous casting blank, then carrying out rough rolling and finish rolling treatment, carrying out secondary stretching and secondary cooling on the treated intermediate to ensure the use performance of the steel bar, and stretching the rolled intermediate to ensure the service life of the steel bar. The intermediate can be shaped again in the stretching process, the influence of thermal expansion and cold contraction is considered, then the intermediate enters a cooling device to be cooled, secondary stretching is carried out after cooling, the intermediate can be shaped in the secondary stretching process, the intermediate subjected to secondary stretching is cooled again, and natural cooling is carried out after secondary cooling; according to the treatment mode recorded by the invention, the hot-rolled steel bars can be subjected to secondary stretching and three-time cooling, the performance of the hot-rolled steel bars can be effectively ensured, and the cooling device is arranged corresponding to the technical scheme recorded by the invention, and the cooling device is used for cooling the hot-rolled steel bars.

Description

technical field [0001] The invention belongs to the technical field of steel production, in particular, the invention relates to a novel hot-rolled steel bar production process. Background technique [0002] Hot-rolled steel bars are finished steel bars that have been hot-rolled and naturally cooled. They are made of low-carbon steel and ordinary alloy steel at high temperatures. They are mainly used for reinforcement of reinforced concrete and prestressed concrete structures. They are used in civil engineering One of the most used types of steel, hot-rolled steel bars should have a certain strength, that is, yield point and tensile strength, which are the main basis for structural design. Hot-rolled steel bars are soft and rigid, and necking occurs when they break. Cooling and shaping after rolling can effectively avoid the deformation of hot-rolled steel bars. Hot-rolling is a common processing method for non-ferrous metals. The temperature of hot-rolling is higher than th...

Claims

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Application Information

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IPC IPC(8): B21C37/04
Inventor 林宇范世雄计剑平陈丕锦刘小苗
Owner 云南玉溪玉昆钢铁集团有限公司