Double-phase stainless steel casting blank microstructure display chromatic corrosive and corrosion method

A duplex stainless steel and microstructure technology, which is applied in the field of duplex stainless steel billet microstructure display color etchant and corrosion, can solve the problems of poor thermal processing performance and surface cracks of duplex stainless steel, and achieve good erosion effect and easy corrosion. Operational, easy-to-control effects

Inactive Publication Date: 2012-11-07
ZHENSHI GROUP EASTERN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor thermal processing performance of duplex stainless steel, edge cracks and surface cracks tend to occur during thermal processing, and the thermal processing performance has a certain relationship with the original structure of the billet and the transformation of the billet structure after heating. Observation of the metallographic structure of the slab
However, there is still no good corrosion solution and corrosion method to detect duplex stainless steel

Method used

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  • Double-phase stainless steel casting blank microstructure display chromatic corrosive and corrosion method
  • Double-phase stainless steel casting blank microstructure display chromatic corrosive and corrosion method
  • Double-phase stainless steel casting blank microstructure display chromatic corrosive and corrosion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The following part of this example describes a duplex stainless steel slab microstructure revealing color etchant.

[0027] This metallographic etching agent is made of hydrochloric acid, nitric acid, potassium metabisulfite and deionized water, and each composition is respectively: potassium metabisulfite 6g; Hydrochloric acid (mass percentage concentration is 40%) 15ml and nitric acid (mass percentage concentration is 40%) 68%) 10ml, deionized water 150ml.

[0028] The following part of this embodiment describes a method for disposing a colored etchant for displaying the microstructure of a cast slab of duplex stainless steel.

[0029] Prepare corrosive agent according to the following order: first weigh potassium metabisulfite 6g; measure hydrochloric acid (mass percentage concentration is 40%) 15ml and nitric acid (mass percentage concentration is 68%) 10ml, then measure deionized water 150ml, in After mixing in a glass, stir well with a glass rod and let it stand...

Embodiment 2

[0035] The following part of this example describes a duplex stainless steel slab microstructure revealing color etchant.

[0036] This metallographic etching agent is made of hydrochloric acid, nitric acid, potassium metabisulfite and deionized water, and each composition is respectively: potassium metabisulfite 6g; Hydrochloric acid (mass percentage concentration is 40%) 10ml and nitric acid (mass percentage concentration is 40%) 68%) 5ml, deionized water 200ml.

[0037] The following part of this embodiment describes a method for disposing a colored etchant for displaying the microstructure of a cast slab of duplex stainless steel.

[0038] Prepare corrosive agent according to the following order: first weigh potassium metabisulfite 6g; measure hydrochloric acid (mass percentage concentration is 40%) 10ml and nitric acid (mass percentage concentration is 68%) 5ml, then measure deionized water 200ml, in After mixing in a glass, stir well with a glass rod and let it stand f...

Embodiment 3

[0044] The following part of this example describes a duplex stainless steel slab microstructure revealing color etchant.

[0045] This metallographic etching agent is made of hydrochloric acid, nitric acid, potassium metabisulfite and deionized water, and each composition is respectively: potassium metabisulfite 5g; Hydrochloric acid (mass percentage concentration is 40%) 15ml and nitric acid (mass percentage concentration is 40%) 68%) 10ml, deionized water 150ml.

[0046] The following part of this embodiment describes a method for disposing a colored etchant for displaying the microstructure of a cast slab of duplex stainless steel.

[0047] Prepare corrosive agent according to the following order: first weigh potassium metabisulfite 5g; measure hydrochloric acid (mass percentage concentration is 40%) 15ml and nitric acid (mass percentage concentration is 68%) 10ml, then measure deionized water 150ml, in After mixing in a glass, stir well with a glass rod and let it stand...

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Abstract

The present invention relates to a double-phase stainless steel casting blank microstructure display chromatic corrosive and a corrosion method, and is suitable for the detection of double-phase stainless steel. The corrosive comprises components of: 1-8g of potassium metabisulfite, 10-25ml of hydrochloric acid with mass percent concentration of 40%, 5-5ml of nitric acid with mass percent concentration of 68% and 150-230ml of deionized water. The invention has advantages of reasonably designed formula, good corrosion effect, good display effect of structure of a corroded specimen, no pollution, stable corrosion reaction, and easy configuration.

Description

technical field [0001] The invention relates to a dual-phase stainless steel billet microstructure display color etchant and a corrosion method, which are suitable for the detection of duplex stainless steel. Background technique [0002] Since the advent of duplex stainless steel, due to the performance advantages of both ferritic and austenitic stainless steel, it has excellent corrosion resistance, mechanical properties and welding properties. The combination of these excellent properties makes it widely used in petroleum, chemical, electric power and other fields. However, due to the poor thermal processing performance of duplex stainless steel, edge cracks and surface cracks tend to occur during thermal processing, and the thermal processing performance has a certain relationship with the original structure of the billet and the transformation of the billet structure after heating. The metallographic structure of the slab was observed. However, there is still no good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
Inventor 杨振颜海涛刘腾飞袁辉申鹏王士瑞
Owner ZHENSHI GROUP EASTERN SPECIAL STEEL
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