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Method for determining corresponding position relation between coil rod surface defect and continuous cast billet

A technology of corresponding position and continuous casting billet, which is applied in the field of determining the relationship between the surface defects of the wire rod and the corresponding position of the continuous casting billet, can solve the problems of difficulty in determining and finding the causes of the surface defects of the wire rod, and achieves the effect of facilitating analysis and optimization.

Inactive Publication Date: 2017-11-24
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no direct and effective characterization method for the relationship between the surface defects of the wire rod and the microstructure and properties of the continuous casting slab, which makes it difficult to determine and find the cause of the surface defects of the wire rod. Therefore, a method that can directly determine the relationship between the surface defects of the wire rod and the The method of the corresponding relationship between the position of the continuous casting slab has positive significance for the improvement of the surface defects of the wire rod and the optimization of the process

Method used

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  • Method for determining corresponding position relation between coil rod surface defect and continuous cast billet
  • Method for determining corresponding position relation between coil rod surface defect and continuous cast billet
  • Method for determining corresponding position relation between coil rod surface defect and continuous cast billet

Examples

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Embodiment 1

[0025] The analysis sample in this embodiment is SWRH82B wire rod produced by a steel factory, and the carbon content is 0.82wt%. Take the cross-section of the wire rod through a cutting machine, grind it with a grinding wheel, and then grind it on 180#, 400#, 800# and 1000# water sandpaper in turn, and then polish it with 2.5 μm and 1 μm diamond abrasive paste on the polishing disc. Until the cross-section of the sample is smooth without obvious scratches. After polishing, rinse the cross-section of the sample with alcohol, wipe the stains on the cross-section of the sample with cotton, and then dry it with a hair dryer;

[0026] Add 2g of water-sealed analytically pure picric acid (purity ≥ 99.8%) into 100ml of distilled water, then add 8ml of white cat detergent, stir evenly to prepare the corrosive agent, and put it into a constant temperature water bath at 65°C. The cross-section of the prepared sample is facing upwards, immersed in the etchant for 18 seconds, take out t...

Embodiment 2

[0029] The analysis sample in this embodiment is a 65Mn wire rod produced by a steel factory, and the carbon content is 0.64wt%. Take the cross-section of the wire rod through a cutting machine, grind it with a grinding wheel, and then grind it on 180#, 400#, 800# and 1000# water sandpaper in turn, and then polish it with 2.5 μm and 1 μm diamond abrasive paste on the polishing disc. Until the cross-section of the sample is smooth without obvious scratches. After polishing, rinse the cross-section of the sample with alcohol, wipe the stains on the cross-section of the sample with cotton, and then dry it with a hair dryer;

[0030] Add 4 g of analytically pure picric acid (purity ≥ 99.8%) sealed in water to 100 ml of distilled water, then add 10 ml of white cat detergent, and stir evenly to prepare the corrosive agent. Put the prepared corrosive agent into a constant temperature water bath, heat and stabilize at 75°C. Put the cross-section of the prepared sample facing up, imm...

Embodiment 3

[0033] The analysis sample in this embodiment is an SAE1022B wire rod produced by a steel factory, and the carbon content is 0.21wt%. Take the cross-section of the wire rod through a cutting machine, grind it with a grinding wheel, and then grind it on 180#, 400#, 800# and 1000# water sandpaper in turn, and then polish it with 2.5 μm and 1 μm diamond abrasive paste on the polishing disc. Until the cross-section of the sample is smooth without obvious scratches. After polishing, rinse the cross-section of the sample with alcohol, wipe the stains on the cross-section of the sample with cotton, and then dry it with a hair dryer;

[0034] Add 4 g of analytically pure picric acid (purity ≥ 99.8%) sealed in water to 100 ml of distilled water, then add 5 ml of white cat detergent, and stir evenly to prepare the corrosive agent. Put the prepared corrosive agent into a constant temperature water bath, heat and stabilize it at 80°C. Put the cross-section of the prepared sample upwards...

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Abstract

The invention discloses a method for determining a corresponding position relation between a coil rod surface defect and a continuous cast billet. The method sequentially comprises the following steps: preparing samples, preparing corrosive, performing corrosion and performing observation. The method has the advantages that the position relation between the coil rod surface defect and the continuous cast billet corner can be obtained be the method, so that analysis and improvement of the forming reason of the coil rod surface defect are benefited.

Description

technical field [0001] The present application particularly relates to a method for determining the corresponding positional relationship between the surface defect of the wire rod and the continuous casting slab. Background technique [0002] The solidification structure and properties of continuous casting slab have great influence on the structure and properties of rolled wire rod. When there is serious segregation in the center of the continuous casting slab, it is easy to form defects such as reticular cementite and martensite in the center of the wire rod; Scars, warped skin and other defects. However, the formation of defects on the surface and center of the wire rod is not only related to the defects in the continuous casting process, but also related to the steel rolling process, equipment status, and shipping and stacking. How to quickly find out the cause of the defects in the finished wire rod is an urgent problem to be solved in the production of iron and steel...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N1/28G01N1/32
CPCG01N1/286G01N1/32G01N21/84
Inventor 周青峰邹长东苏笃星王雷李解
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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