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Metallographic corrosive agent and metallographic display method for primary banded structure of steel

A technology of strip structure and display method, applied in the field of metallographic inspection, can solve the problems of inability to corrode and display clear primary strip structure, primary strip structure corrosion and difficult display, etc.

Active Publication Date: 2020-10-27
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion and display of the primary banded structure has always been a difficult problem, and it is not yet possible to corrode and display a clear primary banded structure

Method used

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  • Metallographic corrosive agent and metallographic display method for primary banded structure of steel
  • Metallographic corrosive agent and metallographic display method for primary banded structure of steel
  • Metallographic corrosive agent and metallographic display method for primary banded structure of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Preparation of metallographic etchant for primary banded structure of steel according to the present invention: 25 ml of water, 25 ml of methanol, 20 g of copper chloride and 1 ml of hydrochloric acid with a mass percentage concentration of 36w% are uniformly mixed to obtain the metallographic etchant for primary banded structure of steel, and put into Reserve in container.

[0074] (1) Take 20CrMnTi steel (after heat treatment: heat to 930 degrees in the austenite zone, keep warm for 30 minutes, and then carry out water cooling treatment), obtain a longitudinal section along the direction parallel to the rolling direction of the steel, and obtain a 20CrMnTi steel sample. After inlaying, grinding and polishing, until the polished surface is smooth and free of obvious scratches and stains;

[0075] (2) adopt the metallographic etchant of the primary strip structure of the steel prepared above, the polished surface of the steel sample obtained in step (1) is rubbed for 10...

Embodiment 2

[0079] Preparation of metallographic etchant for primary banded structure of steel according to the present invention: 35 ml of water, 35 ml of methanol, 30 g of copper chloride and 3 ml of hydrochloric acid with a mass percent concentration of 38w% are uniformly mixed to obtain the metallographic etchant for primary banded structure of steel, and put into Reserve in container.

[0080] (1) Take Q420 steel, obtain a longitudinal section parallel to the rolling direction of the steel, and obtain a Q420 steel sample, which is inlaid, ground and polished until the polished surface is smooth and free of obvious scratches and stains;

[0081] (2) adopt the metallographic etchant of steel material primary strip structure of above-mentioned preparation, the polishing surface of the steel sample that step (1) obtains is carried out drop etching treatment 8 seconds, and polishing surface appears red, obtains metallographic corrosion sample;

[0082] (3) the metallographic corrosion sam...

Embodiment 3

[0085] Preparation of metallographic etchant for primary banded structure of steel according to the present invention: 30ml of water, 30ml of methanol, 25g of copper chloride and 2ml of hydrochloric acid with a mass percentage concentration of 36w% are uniformly mixed to obtain the metallographic etchant for primary banded structure of steel, and put into Reserve in container.

[0086] (1) Take Q420 steel, obtain a longitudinal section parallel to the rolling direction of the steel, and obtain a Q420 steel sample, which is inlaid, ground and polished until the polished surface is smooth and free of obvious scratches and stains;

[0087] (2) The polished surface of the steel sample that step (1) obtains is immersed in the metallographic etchant of the primary banded structure of the above-mentioned steel, and the polished surface of the steel sample is perpendicular to the liquid level of the metallographic etchant of the primary banded structure of the steel, and is carried out...

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Abstract

The invention belongs to the technical field of metallographic detection, and relates to a metallographic corrosive agent and metallographic display method for the primary banded structure of steel. The metallographic corrosive agent comprises water, methanol, copper chloride and hydrochloric acid; the ratio of the volume of the water to the volume of the methanol to the mass of the copper chloride to the volume of the hydrochloric acid is (25-35)ml to (25-35)ml to (20-30)g to (1-3)ml. The metallographic corrosive agent and the metallographic display method are mainly suitable for hot-rolled steel products subjected to rolling deformation, can also be used for steel products subjected to heat treatment after rolling, are convenient to operate and stable in corrosion effect, can clearly display a primary banded structure of a steel sample, and can be used for evaluating the quality and performance of the steel products.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection, and in particular relates to a metallographic etchant for a steel primary strip structure and a metallographic display method. Background technique [0002] Generally speaking, the banded structure is caused by the dendrite segregation of the steel ingot. Since molten steel selectively crystallizes during solidification, its components on the branches are relatively pure, while more impurities such as carbon, alloying elements, phosphorus and sulfur are enriched between the dendrites. When the steel ingot is deformed by forging and rolling, its trunk and dendrites are rolled and elongated into a fibrous structure, thus forming a so-called primary band structure, which is the original band formed by dendrite segregation extending along the thermal processing direction. The root cause of the secondary band structure is that carbon and other alloying elements segregate and concent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/2045G01N33/204G01N23/2252G01N23/2202G01N21/84G01N3/40G01N1/32G01N1/28
CPCG01N33/204G01N33/2045G01N21/84G01N23/2252G01N23/2202G01N3/40G01N1/28G01N1/32G01N2021/8477
Inventor 温娟来萍贾惠平鞠新华严春莲张莉霞
Owner SHOUGANG CORPORATION
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