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HiB steel decarburization and nitridation annealing roll sample preparation method and nitrogen content detection method

A decarburization and nitriding technology, which is used in the preparation, sampling, and measuring devices of test samples, and can solve problems such as affecting the accuracy of test results.

Pending Publication Date: 2020-10-30
湖南华菱涟源钢铁有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiment of the present application is to provide a sample preparation method for HiB steel decarburization and nitriding annealing coils, so as to solve the technical problems in the prior art that the sampling affects the accuracy of the test results and the operation is easy

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  • HiB steel decarburization and nitridation annealing roll sample preparation method and nitrogen content detection method
  • HiB steel decarburization and nitridation annealing roll sample preparation method and nitrogen content detection method
  • HiB steel decarburization and nitridation annealing roll sample preparation method and nitrogen content detection method

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Experimental program
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Effect test

Embodiment 1

[0048]The sample preparation method of HiB steel decarburization and nitriding annealing coil comprises the following steps:

[0049] Use scissors to cut out a sample of about 24mm×10mm on the template, and control the weight at about 0.35g±0.02g.

[0050] The sample was crimped into a ball with needle nose pliers.

[0051] Clean the sample with ultrasound and ethanol for 3 minutes, take it out, and dry it with a hair dryer for inspection.

[0052] Compared with the prior art, the sample preparation method of this embodiment will not jam the sample, completely retain the surface nitriding layer, and there is no adhesion of foreign matter such as absorbent cotton. And the sample preparation speed is fast, the whole process only takes about 4 minutes.

[0053] The decarburization and nitriding annealing coil of HiB steel No. 27TW was sampled and treated by the above method, and 8 samples were prepared, and the nitrogen content of the prepared samples was detected by the implem...

Embodiment 2

[0057] Adopt the sample preparation method of embodiment 1 to carry out sample preparation to the HiB steel decarburization nitriding annealing coil that number is 0003TC, 0003TD, 27WD, 27TD-1, 27TD-2, adopt thin sample punch sample preparation method in the prior art simultaneously Samples were specifically prepared by punching pellets with a MLF-BLF punch, and the samples were also cleaned in the same manner as in Example 1. The specific meaning of each sample number is as follows: the number represents the roll number; the first letter T represents the head, W represents the tail; the second letter D represents the transmission side, C represents the middle part, and W represents the working side.

[0058] The nitrogen content of the samples prepared in the above two ways was tested using the implementation standard GB / T20124-2006.

[0059] The comparison data are shown in Table 2. The comparison deviation between this method and the sample preparation method of flushing pe...

Embodiment 3

[0065] In this embodiment, the decarburization and nitriding annealing coil of HiB steel numbered 20TM-2 is sample prepared, and the sample preparation steps are the same as in embodiment 1 except for the cleaning step of the crimped sample. In this embodiment, different methods are used to clean the curled samples, and the influence of the cleaning methods on the detection results is investigated.

[0066] 1. Experimental design

[0067] 1.1 Use hydrochloric acid, sodium bicarbonate, ethanol + ultrasonic three cleaning agents (methods) to clean the same steel coil sample, and then repeatedly detect the nitrogen element on the oxygen and nitrogen analyzer. The data are as follows:

[0068] 1.1.1 10% dilute hydrochloric acid cleaning

[0069] The sample was soaked in 10% dilute hydrochloric acid for 3 minutes. The reaction was violent during soaking. After soaking, the surface of the sample changed significantly.

[0070] Table 3 Precision test w / % after soaking in 10% dilute...

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Abstract

The invention provides a HiB steel decarburization and nitridation annealing roll sample preparation method and a nitrogen content detection method. The sample preparation method comprises the following steps of shearing a sample from a HiB steel decarburization and nitridation annealing roll by using scissors, and controlling the weight of the sample to be 0.35 g + / -0.02 g, curling the sample into a mass, and cleaning the curled sample. According to the HiB steel decarburization and nitridation annealing roll sample preparation method, the sample is cut off by scissors, and a nitridation layer on the surface of the sample is completely reserved. The weight of the sample is controlled to be 0.35 g + / -0.02 g, so that the stability of detection result data can be guaranteed, the reproducibility is good, meanwhile, the sample is curled into a mass to facilitate sample injection, and the sample cannot be clamped at a sample injection port. And detection can be carried out after cleaning iscompleted. The treatment method is simple and convenient to operate, simple in treatment device, low in cost and high in test result accuracy.

Description

technical field [0001] The application belongs to the field of sample processing, and more specifically, relates to a sample preparation method of HiB steel decarburization and nitriding annealing coils and a nitrogen content detection method. Background technique [0002] Nitriding is a chemical heat treatment process that infiltrates nitrogen atoms into the surface of the workpiece in a certain medium at a certain temperature. After nitriding is completed, it is necessary to test the nitrogen content of workpiece samples to check the nitriding effect. [0003] After decarburization and nitriding of HiB steel coils, the thickness of the surface nitride layer is about 40 μm. In China, hand-held electric punching shears are used to cut small fragments along the DS or OS side of the coil. However, during the detection process, it is found that the nitrogen content measured by this method is The accuracy is not high. However, when using a punching machine for particle analysi...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/34
CPCG01N1/28G01N1/286G01N1/34G01N2001/2873
Inventor 李新家苏红梅张文慧王神武杨秀芝王自荣
Owner 湖南华菱涟源钢铁有限公司
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