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Method for producing good-quality high-carbon steel green rod for drawing

A technology of hot-rolled wire rod and production method, which is applied in the direction of metal rolling, metal rolling, workpiece surface treatment equipment, etc., and can solve the problem of undisclosed control of sorbite lamellar gap technology, poor comprehensive performance of pearlite, and very poor It is difficult to accurately control the gap size of the sorbite lamellae to achieve excellent comprehensive mechanical properties, small sorbite lamellae spacing, and easy control

Inactive Publication Date: 2008-12-24
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The shortcomings of the above two generation methods are: first, the interlamellar spacing of pearlite is greater than that of sorbite, and the comprehensive performance of pearlite is worse than that of sorbite; second, this method only proposes the average interlamellar interval λ and The relationship between the tensile strength Rm, but the process method for controlling the interlamellar gap of sorbite is not disclosed, and it is also difficult to accurately control the amount of sorbite and the size of interlamellar interstitial space in actual production

Method used

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  • Method for producing good-quality high-carbon steel green rod for drawing
  • Method for producing good-quality high-carbon steel green rod for drawing
  • Method for producing good-quality high-carbon steel green rod for drawing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the production method of Φ14mm specification hot-rolled wire rod

[0029] 1) Heating 150mm×150mm continuous casting high-quality carbon 70 steel billet, after heating, start rolling in the high-temperature recrystallization zone of 1050°C, carry out rough rolling, intermediate rolling and pre-finish rolling, after rolling through 17 rolling mills, the diameter of the rolled piece is Φ20.8mm, area 339.8mm 2 , cumulative elongation n 1 = 66.2 times;

[0030] 2) Water-through cooling (pre-water cooling) is performed after the pre-finish rolling to adjust the temperature of the core and surface of the billet. The cooling rate of the pre-water cooling is controlled at 35.7°C / s, and the cooling time is 1.3s;

[0031] 3) Carry out 4 passes of finish rolling, the start temperature of finish rolling is 925°C, and the temperature after finish rolling is 930°C (finish rolling temperature), the size (mm) and elongation n of each pass after rolling 2 See Table 1;

...

Embodiment 2

[0037] Embodiment 2: the production method of Φ5.5mm specification hot-rolled wire rod

[0038] 1) Heating 150mm continuous casting high-quality carbon 70 steel billet, starting rolling at 1072°C, after rough rolling, intermediate rolling and pre-finish rolling, the diameter of the rolled piece is Φ16mm, and the area is 201.1mm 2 , cumulative elongation n 1 = 111.9 times;

[0039] 2) Water-through cooling (pre-water cooling) is performed after the pre-finish rolling to adjust the temperature of the core and surface of the billet. The cooling rate of the pre-water cooling is controlled at 30.1°C / s, and the cooling time is 1.8s;

[0040] 3) Perform 10 passes of finish rolling, the start temperature of finish rolling is 930°C, the temperature after finish rolling is 1010°C (finish rolling temperature), the size (mm) and elongation n of each pass after rolling 2 See Table 2;

[0041] 4) After the finish rolling, the rolled piece is subjected to accelerated cooling through water...

Embodiment 3

[0045] Embodiment 3: the production method of Φ8mm specification hot-rolled wire rod

[0046] 1) Heating 150mm continuous casting high-quality carbon 70 steel billet, starting rolling at 998°C, after rough rolling, intermediate rolling and pre-finish rolling, the diameter of the rolled piece is Φ18.5mm, and the area is 268.6mm 2 , cumulative elongation n 1 = 83.7 times;

[0047] 2) Water-through cooling (pre-water cooling) is carried out after the pre-finish rolling to adjust the temperature of the core and surface of the billet. The cooling rate of the pre-water cooling is controlled at 12.0°C / s, and the cooling time is 1.7s;

[0048] 3) Carry out 8 passes of finish rolling, the start temperature of finish rolling is 950°C, the temperature after finish rolling is 982°C (finish rolling temperature), the size (mm) and elongation n of each pass after rolling 2 See Table 3;

[0049] 4) After the finishing rolling, the rolled piece is subjected to water-through accelerated cool...

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Abstract

The invention discloses a production method to draw high-quality high-carbon steel green rod, which includes the following steps: firstly, the high-carbon continuous cast steel is heated, and then goes through the treatment processes of rough rolling, medium rolling and prefinishing rolling so that the cumulative rolling elongation n1 equals 65 to 120 times; secondly, the rolled pieces are prewatercooled; and then the rolled pieces go through the prefinishing rolling process for 4 to 10 times, wherein, the elongation n2 equals to 1. 1 to 1. 3 times each time and the finishing temperature is 920 to 1090 degrees centigrade; and then the rolled pieces are prewatercooled for a second time, wherein, the rolled pieces reach a drawing out temperature of 830 to 900 degrees centigrade and are made into scattered rolls; in the end, the scattered rolls are air-cooled, wherein, the temperature of the scattered rolls at the outlet of the air cooling roll table is 330 to 450 degrees centigrade; the rolls are cooled in the air environment to room temperature to produce high quality high-carbon steel green rods for drawing, which have large numbers of sorbites, small interlamellar spacing and stable mechanical properties and are not apt to brittle fracture in the production process.

Description

technical field [0001] The invention relates to the production and processing of steel wire rods, in particular to a production method of high-quality high-carbon steel hot-rolled wire rods for drawing. Background technique [0002] Carbon structural steel wire rods, especially high-quality high-carbon steel wire rods with a carbon content of 0.6-0.8%, are important raw materials for manufacturing screws, bolts, nuts, steel wires, wire ropes, drill bits, balls, welding rods, and spring steel wires. High-quality high-carbon steel wire rods with different needs and uses have different mechanical performance standards. The chemical composition, structure and grain size of steel play a decisive role in the mechanical properties of steel, especially for high-quality high-carbon steel wires drawn into different specifications of steel wires, not only require high strength, but also It is required to have good extensibility and toughness. [0003] For conventionally produced high...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B45/02B21B37/74
Inventor 陈庆丰严钢周新龙熊永强张青山谈知良熊玉彰杨友明吴卫明劭主彪张彦文
Owner WUHAN IRON & STEEL (GROUP) CORP
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