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Production technology of hot-rolled high-strength fine-diameter steel bar by adopting drawing wire

A production process and thin-diameter technology, applied in the direction of metal rolling, can solve problems such as low production efficiency, high production cost, and large strength fluctuations, so as to improve production efficiency and production volume, improve the performance and performance of cleaning rods, and improve The effect of strength and toughness

Active Publication Date: 2015-06-24
江苏森林建筑新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the production process of high-strength 6-12mm thin-diameter steel bars at home and abroad is mainly through sending the steel billet into the hot-rolling unit, and the hot-rolled high-strength 6-12mm thin-diameter steel bars after rolling by the finishing mill enter the high-speed laying machine , the wire laying machine spits out 6-12mm thin-diameter steel bars at high temperature and high speed to form a ring shape, which cannot be heat-treated. At the same time, the strength and ductility of the steel bars are greatly affected by the ring-shaped accumulation, and a large amount of alloy elements must be added to make up for the strength. lack of
[0003] Due to the low production efficiency and high production cost of 6-12mm thin-diameter steel bars produced by steel mills, the 6-12mm thin-diameter steel bars rolled by steel mills are directly used for heat treatment. The production efficiency of the heat treatment production line is low and cannot reach the steel mill high production speed
The superposition of purchase cost and heat treatment cost leads to the cost of producing high-strength steel bars far greater than the cost of adding alloy elements in steel mills
There are disadvantages such as large consumption of alloy, large fluctuation of strength and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a production process for hot-rolled high-strength thin-diameter steel bars with a traction line. In this production process, the traction line drives the disc rod to pass through the induction heating unit, the rolling unit, the pinch roller, and the ultra-high pressure instantaneous quenching device. , flying shears and collecting trays. In the specific operation, the traction line is made of high carbon steel drawn into a linear shape and then annealed. The process specifically includes the following steps:

[0030] Step (1): Before starting the equipment, pass the traction line through the induction heating unit, rolling unit, pinch roller, ultra-high pressure instantaneous quenching device and flying shear along its length direction, and finally fix it in the collecting tray. Correct the entrance and exit of the aforementioned equipment so that the entrance and exit of all equipment are on the same center line;

[0031] Step (2): welding the...

Embodiment 2

[0037] The specific scheme of this embodiment is: the induction heating unit includes at least two 500KHZ preheating intermediate frequency heat treatment devices, at least five 250KHZ super audio heat treatment devices and at least two 160KHZ super audio heat treatment devices successively arranged along the length direction of the traction line, including The specific treatment is as follows:

[0038] First, the pinch roller drives the traction line to pull the thin-diameter steel bar through at least two 500KHZ preheating intermediate frequency heat treatment devices to heat the thin-diameter steel bar to at least 720°C, and then continuously pass through at least five 250KHZ super-audio frequency heat treatment devices to heat the thin-diameter steel bar to At least 900°C, and finally through at least two 160KHZ supersonic heat treatment devices to heat the thin-diameter steel bars to at least 1000°C, preferably 1150°C;

[0039] The ultra-high pressure instantaneous quench...

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PUM

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Abstract

The invention discloses a production technology of a hot-rolled high-strength fine-diameter steel bar by adopting a drawing wire. The production technology is that a disc rod is driven by the drawing wire to orderly pass through an inductive heating unit, a rolling unit, a pinch roll, an ultra-high pressure transient quenching device, a flying shear and a catch tray. The drawing wire is adopted in the production technology, so that the steel bar is ensured to run on a central line; the problem that the 6-12mm of fine-diameter steel bar cannot be subjected to online heating and online thermal treatment is solved. Thus, the strength and the ductility of the fine-diameter steel bar are ensured; alloy consumption is effectively reduced; the product strength is stable, and the production and operation are simple and convenient; the cost is saved.

Description

technical field [0001] The invention relates to the production process field of high-strength 6-12mm thin-diameter steel bars, in particular to a production process for hot-rolled high-strength 6-12mm thin-diameter steel bars with a drawing line. Background technique [0002] At present, the production process of high-strength 6-12mm thin-diameter steel bars at home and abroad is mainly through sending the steel billet into the hot-rolling unit, and the hot-rolled high-strength 6-12mm thin-diameter steel bars after rolling by the finishing mill enter the high-speed laying machine , the wire laying machine spits out 6-12mm thin-diameter steel bars at high temperature and high speed to form a ring shape, which cannot be heat-treated. At the same time, the strength and ductility of the steel bars are greatly affected by the ring-shaped accumulation, and a large amount of alloy elements must be added to make up for the strength. lack of. [0003] Due to the low production effic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/08C21D1/18B21B1/16
Inventor 吴海洋姚圣法
Owner 江苏森林建筑新材料股份有限公司