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Production method for controlling cup-cone-shaped fracture of steel wire rope SWRH82B

A production method and wire rope technology, which are applied in the field of production technology of high carbon steel wire rods, can solve the problems of poor plasticity, low tensile strength, and great influence on the performance of wire rope SWRH82B, and achieve the effect of improving the cup-cone fracture defect of SWRH82B

Inactive Publication Date: 2021-10-01
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] SWRH82B is a steel type specified in the Japanese standard JIS G3506-2004 high carbon steel wire rod standard. At present, many domestic steel mills use this standard composition for production. The wire rod is mainly used to produce steel strands, prestressed steel rods, etc. products, but there are generally problems such as low tensile strength and easy fracture during drawing. The current defect rate of drawing fracture is about 10%.
[0003] The inventors of this application found that the cup-cone fracture of the steel wire rope SWRH82B in the production process is mainly affected by two factors: one is the cleanliness of molten steel, and MgO, Al 2 o 3 , CaO, SiO 2 The large brittle inclusions formed have a large size, which has a great influence on the performance of the steel wire rope SWRH82B, especially when it is brittle when it is drawn; the second is the influence of element segregation, such as C segregation leads to a network fracture morphology, S Segregation leads to poor plasticity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 implements as follows:

[0029] 1. The chemical composition of the molten steel for controlling the end point of the converter is: C content 0.05wt%, P content ≤ 0.08wt%, and the sliding plate slag blocking process is adopted when tapping;

[0030] 2. Add 300kg active lime and 100kg fluorite during tapping;

[0031] 3. Using ferrosilicon for deoxidation and alloying;

[0032] 4. After arriving at the LF station, carry out slag making, the alkalinity is controlled at 2.4, and the S content of the molten steel leaving the station is 0.010wt%;

[0033] 5. RH refining is carried out under the condition of RH vacuum degree ≤ 3mbar, and the vacuum treatment time is 10min.

[0034] 6. Calcium treatment is carried out before RH leaves the station, and it is fed into the silicon-calcium line for 200m;

[0035] 7. During continuous casting, the casting is strictly protected throughout the process; the specific water volume of the secondary cooling water for contin...

Embodiment 2

[0038] Embodiment 2 implements as follows:

[0039] 1. The chemical composition of the molten steel for controlling the end point of the converter is: C content 0.06wt%, P content 0.010wt%, and the sliding plate slag blocking process is adopted when tapping;

[0040] 2. Add 300kg active lime and 100kg fluorite during tapping;

[0041] 3. Using ferrosilicon for deoxidation and alloying;

[0042] 4. After arriving at the LF station, carry out slag making, the alkalinity is controlled at 2.7, and the S content of molten steel leaving the station is 0.005wt%;

[0043] 5. RH refining is carried out under the condition of RH vacuum degree ≤ 3mbar, and the vacuum treatment time is 15min.

[0044] 6. Calcium treatment is carried out before RH leaves the station, and it is fed into the silicon-calcium line for 200m;

[0045] 7. During continuous casting, the casting is strictly protected throughout the process; the specific water volume of the secondary cooling water for continuous ...

Embodiment 3

[0048] Embodiment 3 implements as follows:

[0049] 1. The chemical composition of the molten steel for controlling the end point of the converter is: C content 0.06wt%, P content 0.007wt%, and the sliding plate slag blocking process is adopted when tapping;

[0050] 2. Add 300kg active lime and 100kg fluorite during tapping;

[0051] 3. Using ferrosilicon for deoxidation and alloying;

[0052] 4. After arriving at the LF station, carry out slag making, the alkalinity is controlled at 2.6, and the S content of molten steel leaving the station is 0.003wt%;

[0053] 5. RH refining is carried out under the condition of RH vacuum degree ≤ 3mbar, and the vacuum treatment time is 13 minutes.

[0054] 6. Calcium treatment is carried out before RH leaves the station, and it is fed into the silicon-calcium line for 200m;

[0055] 7. During continuous casting, the casting is strictly protected throughout the process; the specific water volume of the secondary cooling water for contin...

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PUM

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Abstract

The invention relates to a production method for controlling cup-cone-shaped fracture of a steel wire rope SWRH82B, and belongs to the technical field of production processes of high-carbon steel wire rods. According to the method, after the reasons of the cup-cone-shaped fracture of the steel wire rope SWRH82B are analyzed and researched by combining actual problems occurring in the production process, the cup-cone-shaped fracture defects of the SWRH82B are overcome through the measures of converter end point control optimizing, an LF slagging process, an RH refining process, continuous casting quality control and the like. Through batch production verification, the drawing fracture defect rate can be reduced to 1% or below.

Description

technical field [0001] The invention relates to a production method for controlling the cup-cone fracture of a steel wire rope SWRH82B, and belongs to the technical field of production technology of high-carbon steel wire rods. Background technique [0002] SWRH82B is a steel type specified in the Japanese standard JIS G3506-2004 high carbon steel wire rod standard. At present, many domestic steel mills use this standard composition for production. The wire rod is mainly used to produce steel strands, prestressed steel rods, etc. products, but there are generally problems such as low tensile strength and easy fracture during drawing. The current defect rate of drawing fracture is about 10%. [0003] The inventors of this application found that the cup-cone fracture of the steel wire rope SWRH82B in the production process is mainly affected by two factors: one is the cleanliness of molten steel, and MgO, Al 2 o 3 , CaO, SiO 2 The large brittle inclusions formed have a larg...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C7/10C21C7/06C21C7/00C21C5/28B22D11/22B22D11/18
CPCC22C33/06C21C5/28C21C7/0006C21C7/06C21C7/10C21C7/0056B22D11/18B22D11/225
Inventor 高翔
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM