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Method for rolling high-precision alloy steel wire rod

A technology for rolling alloy steel rods and wire rods, which is applied in the field of steel rolling, can solve the problems that the dimensional tolerance and ellipticity of finished products cannot be guaranteed, the mechanical properties and dimensional tolerances of special steel products are restricted, and the temperature and rolling control cannot be realized. Improved yield limit, improved mechanical properties, and less modification

Inactive Publication Date: 2015-08-19
CHINA NAT HEAVY MACHINERY RES INSTCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this kind of rolling production line cannot realize temperature control and rolling, and cannot guarantee the tolerance and ovality of finished product size, which seriously restricts the mechanical properties and dimensional tolerance of special steel products.

Method used

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  • Method for rolling high-precision alloy steel wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The process of rolling the continuous casting billet with incoming raw material of 150mm×150mm into Φ14mm bar is as follows:

[0018] Step 1: Send the 150mm×150mm billet cold material into the walking heating furnace for heating, the heating temperature is controlled at 950°C, and then transported to six flat vertical roller rough rolling units for rolling to a circular section of Φ71mm, which is the best possible The size closest to the finished product, then fly cut the head and tail;

[0019] Step 2: Send the rough-rolled steel billet obtained in Step 1 into the middle rolling unit of six flat vertical rollers, and roll it into a Φ30mm circular cross section, which is the closest to the size of the finished product, and then fly the shearing head to enter the 1# wear Water cooling device to cool the rolled piece to 850°C;

[0020] Step 3: Send the steel billet obtained in step 2 into six three-roller reducing and sizing units, and roll the billet into a hot circle o...

Embodiment 2

[0023] The process of rolling the continuous casting billet with incoming raw material of 150mm×150mm into Φ15mm bar is as follows:

[0024] Step 1: Send the 150mm×150mm square billet cold material into the walking heating furnace for heating, the heating temperature is controlled at 1000°C, and then transported to six flat vertical roller rough rolling units, and rolled to a circular section of Φ71mm, as far as possible The size closest to the finished product is reached, and then fly-cut head and tail;

[0025] Step 2: Send the rough-rolled steel billet obtained in Step 1 into the middle rolling unit of six flat vertical rollers, and roll it into a Φ30mm circular cross section, which is the closest to the size of the finished product, and then fly the shearing head to enter the 1# wear Water cooling device to cool the rolled piece to 800°C;

[0026] Step 3: Send the steel billet obtained in step 2 into six three-roller sizing units, adjust the opening degree of the rolls on...

Embodiment 3

[0029] The process of rolling the continuous casting billet with incoming raw material of 150mmx150mm into Φ20mm bar is as follows:

[0030] Step 1: Send the 150mm×150mm square billet cold material into the walking heating furnace for heating, the heating temperature is controlled at 1150°C, and then transported to six flat and vertical roll roughing units, rolling to a circular section of Φ71mm, as far as possible The size closest to the finished product is reached, and then fly-cut head and tail;

[0031] Step 2: Send the rough-rolled steel billet obtained in Step 1 into the middle rolling unit of six flat vertical rollers, and roll it into a Φ30mm circular cross section, which is the closest to the size of the finished product, and then fly the shearing head to enter the 1# wear Water cooling device to cool the rolled piece to 830°C;

[0032] Step 3: Send the steel billet obtained in step 2 into six three-roller reducing and sizing units. On the basis of Example 1, it is n...

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Abstract

The invention discloses a method for rolling a high-precision alloy steel wire rod. The rolling method is characterized in that a six-shelf precise rolling rack is removed on the basis of a traditional rolling technology, a six-shelf three-roller reducing sizing mill and an online diameter measurement device are adopted to freely adjust the rolling size, so that the surface quality of the final product is relatively good, and the tolerance precision of the size is relatively high, meanwhile one group of water penetration cooling devices are respectively arranged at front and rear sides of the six-shelf three-roller reducing sizing mill to realize low temperature rolling and controlled rolling and controlled cooling, so that the mechanical performance of a rolling line product can be greatly increased; the rolling method is slightly changed based on an original production line, temperature and rolling control and precision rolling of the finished size can be realized, the improvement cost is simultaneously greatly reduced, the additional value of the product is increased, and the finished product is high in precision, and thus the change from plain carbon steel to special steel can be quickly realized in a steel plant.

Description

technical field [0001] The invention belongs to the technical field of iron and steel rolling, in particular to a method for rolling high-precision alloy steel rods and wires. Background technique [0002] With the continuous and in-depth development of my country's steel industry, special steel is sought after by major steel mills for its superior metal properties and high added value. However, most of the current rod and wire production lines are too old to meet the requirements of producing high-performance special steel. Even though the new production line in recent years adopts flat-vertical alternately arranged short stress line rolling mill without torsion rolling, nearly 1 / 2 of the cross-sectional contour line in the round hole of the rolled piece is caused by the free width of the rolled piece. Formation, and the amount of free expansion is relatively large, which makes it difficult to precisely control the ellipticity of the final product size. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B45/02
CPCB21B1/16B21B15/0007B21B45/004B21B45/0215
Inventor 王仕杰赵西韩马强贾尚武刘磊周文浩陈灿卢星
Owner CHINA NAT HEAVY MACHINERY RES INSTCO
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