Method for quantitatively examining center segregations of wire rod

An inspection method and center positioning technology, applied in the direction of measuring devices, analyzing materials, and using wave/particle radiation for material analysis, etc., can solve the problems of shallowness and inability to quantitatively evaluate, so as to improve accuracy, improve the level of analysis and detection, and save energy. Analyzing the effect of time

Inactive Publication Date: 2013-03-06
ANGANG STEEL CO LTD
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Problems solved by technology

This method is relatively shallow, and there is a problem that it cannot be quantitatively evaluated.

Method used

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  • Method for quantitatively examining center segregations of wire rod
  • Method for quantitatively examining center segregations of wire rod
  • Method for quantitatively examining center segregations of wire rod

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Embodiment Construction

[0012] Below in conjunction with specific embodiment the present invention is further described:

[0013] Apply the wire rod center segregation evaluation method of the present invention to evaluate the LX80A cord steel wire rod with a diameter of 5.5mm, and its composition is as follows: C: 0.82%, Si: 0.19%, Mn: 0.52%, P: 0.0068%, S: 0.0072 %, O: 14%, Ni: 0.0055%, Als: <0.0005%, Cr: 0.021%, N: 0.0027%, and the balance is Fe and unavoidable impurities.

[0014] 1) Center positioning: Take two 10mm long wire rod samples. Grind the cross-section of one wire rod sample flat, cut the other sample along the longitudinal 2 / 3 of the wire rod, and grind the section of the larger sample flat. Place the above two flattened planes next to each other on the same plane and inlay them with conductive resin such as figure 1 shown. Grind the sample and pay attention to observation. When the width of the longitudinal section is equal to the diameter of another wire rod, polish the plane, an...

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Abstract

The invention discloses a method for quantitatively examining the center segregation of a wire rod. The method comprises the following steps: taking two wire rod samples, rubbing down the cross section of one of the wire rod samples, splitting the other sample at the 2 / 3 position along the vertical direction of the wire rod sample, rubbing down the profile of the lager sample, putting the two rubbed surfaces next to each other in a same plane, inlaying through using a conductive resin, grinding the samples, polishing the plane when the width of the vertical profile of the wire rod sample is equal to the diameter of the other wire rod sample, and corroding the samples through using an alcohol solution of nitric acid; marking through drawing a line at the severest segregation position, and polishing the samples; and putting the samples in an electronic probe analyzer, finding the made mark through using a secondary electron image, carrying out C and Mn element X-ray intensity line analysis measurement of the full width of the samples through utilizing element characteristic X-ray spectrum analysis under an acceleration voltage of 10-20kV, an electron beam current of above 100nA and a beam spot dimension of 20-50mum, recording through using curves, testing the X-ray intensities of a standard sample of the analytic elements under same test conditions, converting the X-ray intensities in the curves into concentration contents, obtaining maximum concentrations and average concentrations from the curves, and obtaining the center segregation rates through calculating according to a formula of the center segregation rate=(the maximum value / the average value)*100%.

Description

technical field [0001] The invention relates to a quality inspection method for steel products, in particular to a quantitative inspection method for center segregation of wire rods. Background technique [0002] High-carbon wire rods are prone to center segregation during the production process, resulting in uneven transformation of the product during heat treatment and intermediate annealing, and brittle zones and early damage in the next processing step, affecting the quality and processing performance of the final product. A typical internal defect. So far, there are many studies on the process of improving the center segregation of the continuous casting slab, and less research on the evaluation method of the segregation degree of the continuous casting slab, and there is no report on the inspection method of the center segregation of the wire rod. Patent CN101949851A "A method for quickly inspecting slab segregation by using a direct-reading spectrometer" uses a direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/225
Inventor 李文竹严平沅马惠霞黄磊
Owner ANGANG STEEL CO LTD
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