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Sampling method and analyzing method for oxygen and nitrogen analysis samples

A technology for analyzing samples and analysis methods, which is applied in the field of sample preparation for oxygen and nitrogen analysis samples, and can solve problems affecting the accuracy of oxygen element analysis in steel, freezing liquid and oil pollution, and difficulty in sample preparation, etc., achieving advantages and disadvantages The judgment is intuitive, the preparation is convenient, and the effect of meeting the online inspection and guiding production

Inactive Publication Date: 2018-03-20
宣化钢铁集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, it is difficult to prepare samples. When sampling round steel, rod-shaped samples are used. For rod-shaped samples, the surface texture of the sample is deep during the process of peeling the skin, and the wire cutting process is polluted by freezing liquid and oil, which seriously affects the oxygen element in the steel. The accuracy of the analysis; secondly, a wire cutting machine is required to take rod-shaped samples of round steel, which takes a long time to prepare samples, and is not suitable for batch-by-batch online oxygen and nitrogen detection of round steel

Method used

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  • Sampling method and analyzing method for oxygen and nitrogen analysis samples
  • Sampling method and analyzing method for oxygen and nitrogen analysis samples
  • Sampling method and analyzing method for oxygen and nitrogen analysis samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The specific process of the sample preparation method and analysis method of the oxygen and nitrogen analysis sample is as follows.

[0021] Detect oxygen and nitrogen elements in φ35mm, GCr15 round steel. Use a metallographic cutting machine to cut off the end of the sample, and then cut it into 6 discs with a thickness of 2±0.5mm. Use a hand-held grinding tool for rough grinding on a 60-mesh abrasive belt, and then on a 120-mesh fine sandpaper. Finishing and grinding, surface roughness Ra<1.6μm (referring to the average convex and concave depth of the sample surface); finally use a punching machine to punch the sheet sample into a round cake-shaped analysis sample, with a thickness of 2±0.5mm and a weight of 0.5~1.0g (Punched samples have the same diameter, different thickness, and different quality). The analysis samples were soaked in acetone and ultrasonically cleaned for 5 minutes, dried with a hair dryer and weighed.

[0022] The analysis conditio...

Embodiment 2

[0025] Embodiment 2: The specific process of the sample preparation method and analysis method of the oxygen and nitrogen analysis sample is as follows.

[0026] Detect oxygen and nitrogen elements in φ32mm, HRB500E large thread. Use a metallographic cutting machine to cut off the end of the sample, and then cut it into 6 discs with a thickness of 2±0.5mm. Use a hand-held grinding tool to perform rough grinding on a 40-mesh abrasive belt, and then on a 180-mesh fine sandpaper. Finishing and grinding, the surface finish Ra<1.6μm; finally, use a punching machine to punch the flake-shaped sample into a round cake-shaped analysis sample, with a thickness of 2±0.5mm and a weight of 0.5-1.0g. The analysis samples were soaked in absolute ethanol, cleaned ultrasonically for 8 minutes, and dried with a hair dryer until the ethanol was completely volatilized, and weighed.

[0027] The same analysis conditions as in Example 1 were adopted (consistent equipment working conditions). Make...

Embodiment 3

[0030] Embodiment 3: The specific process of the sample preparation method and analysis method of the oxygen and nitrogen analysis sample is as follows.

[0031] Detect the oxygen and nitrogen content in the φ20mm, ER70S-6 racket sample before the furnace. First, remove the tail peduncle with a tail peduncle cutter, and remove 2 to 3 mm of oxide skin before slicing. Cut a sheet sample with a thickness of 10mm, and can slice 2 to 3 pieces. Use a hand-held grinding tool to perform rough grinding on a 50-mesh abrasive belt, and then finish grinding on a 180-mesh fine sandpaper, with a surface finish of Ra<1.6 μm; finally use a punching machine to punch the sheet sample into a round cake Analysis sample, thickness 2±0.5mm, weight 0.5~1.0g. Vacuum sampler is used for the analysis sample of the racket in front of the furnace. It is inevitable that there will be air holes or inclusions during the sampling process. When punching samples, the air holes or the positions of inclusions ...

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Abstract

The invention discloses a sampling method and analyzing method for oxygen and nitrogen analysis samples, wherein a flaky sample is cut from the cross section of a sample of above phi20mm, and after polishing, the flaky sample is stamped into a caky analysis sample. The sampling method aims at samples such as round steel of various specifications, large-specification screw-tread steel and racket samples, a rodlike sample is replaced by the flaky sample, and the original sampling process of linear cutting of rodlike sample and peeling is changed to the sampling process of slicing, polishing andstamping; the surface of the flaky sample is easier for polishing, the surface roughness Ra completely meets the requirement specified by standard, and observation for the sample surface is more intuitive; sample preparation is convenient and quick, and the efficiency is increased by about 3-4 times. The sampling method is anhydrous and greaseless in the whole process, and compared with the original linear cutting rodlike samples, sampling speed is greatly increased, judgement for the quality of the sample surface is more intuitive and better to control, and therefore, powerful guarantee is provided for subsequent oxygen and nitrogen analysis accuracy and oxygen and nitrogen analysis precision and accuracy are increased.

Description

technical field [0001] The invention relates to an analysis method for a steel sample, in particular to a sample preparation method and an analysis method for an oxygen and nitrogen analysis sample. Background technique [0002] Oxygen and nitrogen analysis is a commonly used quantitative analysis method, but there are many problems in the previous steel sample analysis process. First of all, it is difficult to prepare samples. When sampling round steel, rod-shaped samples are used. For rod-shaped samples, the surface texture of the sample is deep during the process of peeling the skin, and the wire cutting process is polluted by freezing liquid and oil, which seriously affects the oxygen element in the steel. The analysis accuracy is very high; secondly, wire cutting machine is required to take rod-shaped samples of round steel, which takes a long time to prepare samples, and is not suitable for batch-by-batch online oxygen and nitrogen detection of round steel. Contents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32G01N1/34G01N25/02
Inventor 许鸿英张育新赵兰季陈泽王哲超王海东马玉军
Owner 宣化钢铁集团有限责任公司
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