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Controlled-cooling method for rolled high carbon steel wire rod

A technology of controlled cooling, high carbon steel, applied in the direction of temperature control, etc., can solve the problem of low sorbite rate and strength of the edge wire rod, uneven structure and performance of the edge part of the wire rod, and slow cooling speed of the edge wire rod And other issues

Active Publication Date: 2013-07-03
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large-scale high-carbon steel wire rods, the air-cooling speed after spinning often cannot meet the process requirements, and the precipitation of cementite cannot be completely suppressed. The density is high, so that the cooling speed of the wire rod at the edge is slow, and the cooling speed of the wire rod in the middle is fast, resulting in a low sorbite rate and strength of the wire rod at the edge, resulting in uneven structure and performance at the edge and middle of the wire rod. , it is easy to cause wire breakage during drawing, and the current cooling process cannot solve the above problems well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Φ10mm wire rod with 0.8% carbon content is spun at 916°C;

[0012] After spinning, the wire rod enters the water tank to cool within 3 seconds, and the water temperature is 96°C;

[0013] When the temperature of the wire rod drops to 643°C, it exits the water tank;

[0014] After leaving the water tank, the wire rod is air-cooled to room temperature;

[0015] The metallographic examination was carried out on the Φ10mm wire rod sampling. The metallographic structure of the sample is uniform sorbite, and the sorbite rate reaches 97%.

Embodiment 2

[0017] Φ13mm wire rod with 0.8% carbon content is spun at 908°C;

[0018] After spinning, the wire rod enters the water tank to cool within 4 seconds, and the water temperature is 97°C;

[0019] When the temperature of the wire rod drops to 616°C, it exits the water tank;

[0020] After leaving the water tank, the wire rod is air-cooled to room temperature;

[0021] The metallographic examination was carried out on the Φ13mm wire rod sampling, and the metallographic structure of the sample was uniform sorbite, and the sorbite rate reached 97%.

Embodiment 3

[0023] Φ16mm wire rod with 0.8% carbon content is spun at 912°C;

[0024] After spinning, the wire rod enters the water tank to cool within 5 seconds, and the water temperature is 96°C;

[0025] When the temperature of the wire rod drops to 609°C, it exits the water tank;

[0026] After leaving the water tank, the wire rod is air-cooled to room temperature;

[0027] The metallographic inspection was carried out on the Φ16mm wire rod sampling, and the metallographic structure of the sample was uniform sorbite, and the sorbite rate reached 96%.

[0028] The specific parameters and beneficial effects of each embodiment can be found in Table 1.

[0029] Table 1 Sorbitization rate of each embodiment and comparison table with the original process

[0030] Example

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PUM

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Abstract

The invention discloses a controlled-cooling method for a rolled high carbon steel wire rod, which comprises controlled-cooling on a roller way after spinning. The method is characterized in that: the cooling roller way is sunken; a water tank is arranged at a sunken part; the roller way is accommodated in the water tank containing water; and the spun wire rod enters the water tank for the controlled-cooling, and is discharged out of the water tank and cooled to room temperature. The controlled-cooling method for the rolled high carbon steel wire rod increases the sorbitizing rate of the highcarbon steel wire rod from 80 to 85 percent in an air cooling process to over 95 percent.

Description

technical field [0001] The invention relates to a post-rolling controlled cooling process for wire rods, in particular to a method for controlled cooling after high-carbon steel wire rods are rolled. Background technique [0002] High-carbon steel wire rods generally have unavoidable segregation of central carbon, manganese and other elements. During the phase transformation process after rolling, if the cooling process is unreasonable, reticular cementite will appear in the wire rod structure, and the Reticular cementite becomes one of the main causes of wire breakage in the drawing process. In order to prevent the precipitation of reticular cementite in high carbon steel wire rod, in addition to further reducing the segregation of billet. In terms of the controlled cooling technology of the wire rod after rolling, the current process generally adopts a large flow fan to carry out the air-cooled controlled cooling of the wire rod, so as to inhibit the precipitation of ceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/76
Inventor 王秉喜任玉辉郭大勇白喜峰常桂华高航薛军耿继双
Owner ANGANG STEEL CO LTD
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