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Plain carbon steel wire rod for wire drawing and production process

A production process, the technology of ordinary carbon steel, applied in the direction of metal rolling, etc., can solve problems such as head and tail fractures

Active Publication Date: 2021-11-23
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Φ6.5mm wire rod is directly drawn to the steel wire with a diameter of Φ2.5mm and above, and there is no quality problem in use, but when it is roughly drawn to Φ2.2mm-Φ2.3mm, the head and tail break, and there are triangular cracks on the surface of the fracture of the process line. Drawing broken wire rate 5-6 times / disk

Method used

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  • Plain carbon steel wire rod for wire drawing and production process
  • Plain carbon steel wire rod for wire drawing and production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Production specification: Ф6.5mm wire rod

[0023] Steel grade: Q235L

[0024] Rolling mills in use: Stands 1 to 26

[0025] Production furnace number: 2102892

[0026] Chemical composition: C: 0.14%; Si: 0.18%; Mn: 0.43%; P: 0.022%; S: 0.012%; N: 0.0035%.

[0027] Heating in a 150 billet heating furnace to a rolling start temperature of 1005°C, entering the rough rolling unit for rolling in the first to sixth stands, 1# cutting the head and tail, and then entering the middle rolling mill for rolling in the seventh to 12th stands, 2# After cutting the head, the shearing machine enters the 4 pre-finishing rolling mills for rolling, opens the 1# water tank, controls the temperature of the rolled piece to enter the finishing rolling mill at 996°C, and the 3# flying shear head enters the 10-stand finishing rolling mill and rolls it into wire rod , turn on the 2# water tank, control the spinning temperature to 1038°C, the speed of the air-cooling line roller table is 0.40...

Embodiment 2

[0030] Production specification: Ф6.5mm wire rod

[0031] Steel grade: Q235L

[0032] Rolling mills in use: Stands 1 to 26

[0033] Production furnace number: 1102840

[0034] Chemical composition: C: 0.17%; Si: 0.19%; Mn: 0.43%; P: 0.024%; S: 0.017%; N: 0.0041%.

[0035]Heating in a 150 billet heating furnace to a rolling start temperature of 1022°C, entering the rough rolling unit for rolling at the first to sixth stands, 1# cutting the head and tail, and then entering the middle rolling mill for rolling at the seventh to 12th stands, 2# After cutting the head of the shearing machine, enter the 4 pre-finishing rolling mills for rolling, open the 1# water tank, control the temperature of the rolled piece entering the finishing rolling mill at 1005°C, and then enter the 10-stand rolling mill of the 3# fly-shearing mill to make wire rods , turn on the 2# water tank, control the spinning temperature at 1035°C, the speed of the air-cooling line roller table is 0.40m / s, the coi...

Embodiment 3

[0038] Production specification: Ф6.5mm wire rod

[0039] Steel grade: Q235L

[0040] Rolling mills in use: Stands 1 to 26

[0041] Production furnace number: 2102397

[0042] Chemical composition: C: 0.15%; Si: 0.15%; Mn: 0.46%; P: 0.026%; S: 0.015%; N: 0.0040%.

[0043] Heating in a 150 billet heating furnace to the rolling start temperature of 1035°C, entering the rough rolling mill stand 1-6 for rolling, 1# cutting the head and tail, entering the intermediate rolling mill stand 7-12 for rolling, 2# After cutting the head, the shearing machine enters the 4 pre-finishing rolling mills for rolling, opens the 1# water tank, controls the temperature of the rolled piece to enter the finishing rolling mill at 1006°C, and the 3# flying shear head enters the 10-stand finishing rolling mill and rolls it into wire rod , turn on the 2# water tank, control the spinning temperature to 1040°C, the speed of the air-cooled line roller table is 0.40m / s, collect the wire rod on the reel c...

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Abstract

The invention discloses a plain carbon steel wire rod for wire drawing. The plain carbon steel wire rod has the steel mark of Q235L and comprises the following components of, by mass, 0.14%-0.18% of C, 0.12%-0.30% of Si, 0.40%-0.60% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, less than or equal to 0.005% of N, and the balance iron. The invention further discloses a production process of the plain carbon steel wire rod for wire drawing. The production process comprises the following steps of adjusting the initial rolling temperature from 980-1030 DEG C to 1000-1050 DEG C; adjusting the temperature of a finishing mill group from 950 + / -20 DEG C to 1000 + / -10 DEG C; adjusting the spinning temperature from 930 + / -20 DEG C to 1040 + / -10 DEG C; and adjusting the speed of an air cooling line roller way from 0.18 m / s to 0.40 m / s. After adjustment, the tensile strength of the wire rod produced by using the process is 437 MPa, the elongation is 32.5%, the grain size is 8.0 grade, and the thickness of scale on the surface of the wire rod is 24-30 microns; and the drawing wire breakage rate of a downstream user is reduced from 5-6 times per disc to 1-2 times per disc, or the phenomenon of wire breakage does not exist.

Description

technical field [0001] The invention belongs to the technical field of steel wire rod production, and in particular relates to a common carbon steel wire rod for wire drawing and a production process. Background technique [0002] The applicant currently owns two high-speed wire rod production lines imported from abroad, with an annual design output of 1.5 million tons. The billet is 150 square billets. The product specifications are Ф5.5mm~Φ15mm smooth wire rod and Ф6mm~Φ12mm coil screw, and the highest rolling speed is 135m / s . Among them, the high-speed line produces ordinary carbon steel Q235 wire rods for drawing raw materials, and produces end products such as air nails and wire mesh. The commonly used specifications are Φ6.5mm wire rods. The processing technology of downstream users is usually divided into two categories: wire rod pay-off →Mechanical phosphorus removal→rough drawing (≥Φ2.2mm)→winding→annealing→galvanizing→finish drawing (≥Φ0.6mm)→making row nails; wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/20C22C38/02C22C38/04
CPCB21B1/20C22C38/02C22C38/04C22C38/001Y02P70/10
Inventor 阚永海刘桂华张勇梁立棉王佩鑫
Owner TIANJIN IRON & STEEL GRP
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