In situ quantitative determination method for large-sized metallic inclusion

An in-situ quantification and inclusion technology, which is used in testing metals, preparation of samples for testing, material inspections, etc. It can solve problems such as inability to ensure consistent distribution and inability to accurately analyze the in-situ distribution of inclusions in steel.

Inactive Publication Date: 2008-07-09
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: due to the requirements of "conventional analysis methods", microscopes, in-situ analyzers, and spectrometers on the size of the sample, the sample is still an ordinary small sample; the particle size of the inclusions is derived through the mathematical analysis model The distribution information of various inclusions can be obtained, and the mathematical model derivation cannot guarantee that it is consistent with the actual distribution, and cannot accurately analyze the in-situ distribution state of steel inclusions

Method used

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  • In situ quantitative determination method for large-sized metallic inclusion

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Determination of SS400 slab inclusions, the sampling is shown in Figure 1.

Embodiment 2

[0026] Example 2: Determination of inclusions in 20MnSi rods, the sampling is shown in Figure 2.

Embodiment 3

[0027] Example 3: Determination of inclusions in Q235B H-shaped steel, as shown in Figure 3 for sampling.

[0028] The chemical composition of embodiment 1-3 steel kind is shown in Table 1:

[0029] Table 1

[0030] C(％)

Si(%)

Mn(%)

P(％)

S(％)

SS400 slab

0.17

0.12

0.40

0.025

0.01

20MnSi rod

0.21

0.65

1.55

0.045

0.045

Q235B H-beam

0.14

0.18

0.50

0.018

0.02

[0031] The method for in-situ quantitative detection of large metal inclusions, the steps are as follows:

[0032] (1) Sampling and sample preparation

[0033] For the continuous casting slabs, bars or H-beams of Examples 1-3, respectively cut 200mm long cross-sections, cut 20mm wide samples longitudinally from the surface to the core, clean the surface, coat the resin adhesive layer, and only keep The surface of the original steel is not...

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Abstract

The invention relates to a method for quantitatively determining inclusion in large-scale metal at original position, which belongs to the field of steel determination and analysis technology. The method comprises the following steps of: respectively intercepting a cross section with a length of 100 to 500 mm for continuous casting slab, bar material, H-shaped steel or plate material, longitudinally intercepting a sample with a width of 10 to 20 mm from the surface to the core portion, cleaning the surface of the steel sample, applying a resin adhesive layer except for the original surface of the steel, electrolyzing the sample for 4 to 10 times until the portion of the sample in the electrolyte is completely electrolyzed, and subjecting inclusions collected by each electrolysis step and the each electrolyzed sample layer to routine analysis by using a microscope, an original position analyzer and a spectrometer. Since the sample and the electrolyzed steel material is an integral sample from the surface to the core portion, the method can determine the change of inclusions and precipitates from the surface to the core portion of the steel sample, thus factually representing the distribution of inclusions and precipitates in large-scale metal.

Description

technical field [0001] The patent of the present invention relates to a method for detecting metal inclusions, in particular to a method for in-situ quantitative detection of large metal inclusions. Background technique [0002] The quality of iron and steel products is becoming more and more important to iron and steel enterprises. The content distribution of inclusions in metals is an important part of evaluating product quality. In-situ quantitative detection of inclusions in metals has always been a difficult problem. For large metal (here, large metal refers to metal with a mass of more than 20Kg per meter) structural components, continuous casting slabs, round steel, section steel, plate and strip large steel, in-situ detection of inclusions from the surface to the core , precipitates, and composition changes, the method adopted in the prior art is to take samples at different parts, and use instruments such as in-situ analyzers, microscopes, and spectra to analyze and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20G01N1/32
Inventor 许荣昌蒋鲤平孙会朝李春传
Owner SHANDONG IRON & STEEL CO LTD
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