Heating process before rolling to control the size of titanium inclusions in hypereutectoid cord steel wire rod

A technology of heating process and cord steel, applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve the problem of sensitive size of brittle inclusions, and achieve the effect of small size, reliable process and high feasibility

Inactive Publication Date: 2014-10-22
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as the strength level of the cord increases, it becomes more and more sensitive to the size of brittle inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A pre-rolling heating process for controlling the size of titanium inclusions in hypereutectoid cord steel wire rods. First heat the continuous casting slab of hypereutectoid cord steel to 1150~1200℃ in the steel rolling heating furnace for 4~6 hours, then cool the hypereutectoid cord steel slab heated at high temperature to the hypereutectoid Analysis of the normal rolling temperature of cord steel. Then enter the high wire rolling mill for rolling.

[0020] The hypereutectoid cord steel described in this example is SWRH82A, and its continuous casting slab is: the impurity element Ti in the molten steel before casting is 4~6ppm, and the N is 35~40ppm, and the molten steel is cast into 150×150mm by continuous casting machine 2 billet.

[0021] The normal starting temperature of the hypereutectoid cord steel described in this embodiment is 1000-1020°C.

Embodiment 2

[0023] A pre-rolling heating process for controlling the size of titanium inclusions in hypereutectoid cord steel wire rods. First heat the continuous casting slab of hypereutectoid cord steel to 1200~1250℃ in the steel rolling heating furnace for 2~4 hours, then cool the hypereutectoid cord steel slab heated at high temperature to the hypereutectoid Analysis of the normal rolling temperature of cord steel. Then enter the high wire rolling mill for rolling.

[0024] The hypereutectoid cord steel described in this example is SWRH82A, and its continuous casting slab is: the impurity element Ti in the molten steel before casting is 4~6ppm, and the N is 35~40ppm, and the molten steel is cast into 200×200mm by continuous casting machine 2 billet.

[0025] The normal starting temperature of the hypereutectoid cord steel described in this embodiment is 1000-1020°C.

Embodiment 3

[0027] A pre-rolling heating process for controlling the size of titanium inclusions in hypereutectoid cord steel wire rods. First heat the continuous casting slab of hypereutectoid cord steel to 1180~1230℃ in the steel rolling heating furnace for 3~5 hours, then cool the hypereutectoid cord steel slab heated at high temperature to the hypereutectoid Analysis of the normal rolling temperature of cord steel. Then enter the high wire rolling mill for rolling.

[0028] The hypereutectoid cord steel described in this example is SWRH92A, and its continuous casting slab is: the impurity element Ti in the molten steel before casting is 4~6ppm, and the N is 30~35ppm, and the molten steel is cast into 200×200mm by continuous casting machine 2 Billets.

[0029] The normal starting temperature of the hypereutectoid cord steel described in this embodiment is 990-1010°C.

[0030] In this specific embodiment, the soaking temperature of the hypereutectoid cord steel slab in the steel roll...

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Abstract

The invention relates to a rolling preheating process for controlling the sizes of titanium inclusions in a hypereutectoid tire cord steel wire rod. The technical scheme of the rolling preheating process is characterized by comprising the following steps of: heating a hypereutectoid tire cord steel continuous casting blank to 1150-1250 DEG C in a steel rolling heating furnace, wherein the heating time is 2-6 hours, the titanium inclusion (TiN or Ti(C,N)) in the casting blank is decomposed (namely solid dissolving) in the heating process, small inclusions disappear, and the sizes of the larger-size titanium inclusions are reduced; cooling the high-temperature-heated hypereutectoid tire cord steel continuous casting blank to the normal rolling temperature of hypereutectoid tire cord steel in a water mist cooling or air mist cooling manner; and carrying out rolling by utilizing a high-speed rolling mill. According to the rolling preheating process for controlling the sizes of the titanium inclusions in the hypereutectoid tire cord steel wire rod, the titanium inclusions in the super-strength hypereutectoid tire cord steel wire rod are diffused and distributed, and the number and the sizes of the titanium inclusions in casting blank are effectively controlled. The rolling preheating process has the characteristics that the titanium inclusions are small in number and sizes and are diffused and distributed, and the process is reliable; and according to the rolling preheating process, the penalty point rate of the titanium inclusions of the hypereutectoid tire cord steel wire rod can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of heating technology before cord steel rolling. In particular, the invention relates to a pre-rolling heating process for controlling the size of titanium inclusions in a hypereutectoid cord steel wire rod. Background technique [0002] Cord steel is a high-tech product, mainly used in the production of tire radials, commonly known as steel cords. Steel cord is used to reinforce the frame of the tire, which has the characteristics of high strength and good toughness. The process of producing steel cord is to draw the cord steel wire rod of φ5.5mm into filaments of φ0.15~φ0.38. This process increases the length of the wire by 1000~1400 times and reduces the cross section to 0.08% of the original. It is close to the limit of high-carbon steel drawing process, and it is required to draw broken wires no more than once per 100km. [0003] With the lightening of automobiles and the improvement of car safety, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/70
Inventor 张京熊锐邹峰雷家柳蒋跃东薛正良
Owner WUHAN UNIV OF SCI & TECH
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