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A method for distinguishing red scale and red corrosion products of hot-rolled steel

A technology for corrosion products and hot-rolled steel, which is used in the analysis of materials, the preparation of test samples, and the material analysis by optical means. , to achieve the effect of short test time, reduced rejection rate and convenient operation

Active Publication Date: 2021-07-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the X-ray diffraction method is often used to distinguish whether the red substance is scale or corrosion products, but the sample preparation will cause damage to the original sample, and in-situ analysis cannot be performed.
And the sample preparation is cumbersome, and the test analysis process is long

Method used

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  • A method for distinguishing red scale and red corrosion products of hot-rolled steel
  • A method for distinguishing red scale and red corrosion products of hot-rolled steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The X65 pipeline steel plate produced by hot rolling controlled rolling and controlled cooling process has a thickness of 16mm and a reddish color. Using a ZEISS Axio Imager M2m metallurgical microscope equipped with a polarizer and an analyzer, this method is used to distinguish red substance types, including the following steps:

[0016] (1) Sample preparation. Cut the X65 steel with red surface into 30×30×16mm samples by machine, and keep the original surface state of the samples from damage.

[0017] (2) Observe the sample with parallel light. Disable the polarizer and analyzer, pull out the polarizer, switch to the bright field imaging mode, observe the surface of the sample with the parallel light of the microscope, adjust the microscope imaging mode to color, adjust the magnification to 100 times as needed, and find the object to be observed the target area;

[0018] (3) Observe the sample with polarized light. Use the polarizer and analyzer, push the polariz...

Embodiment 2

[0022] The AH36 ship plate steel produced by the hot rolling process, the thickness of the steel plate is 16mm, and it is placed in the warehouse for 60 days. Using a ZEISS Axio Imager M2m metallurgical microscope equipped with a polarizer and an analyzer, this method is used to distinguish red substance types, including the following steps:

[0023] (1) Sample preparation. Seal the surface of the red X65 steel with epoxy resin to keep the original surface state of the sample undamaged, and cut it into 30×30×16mm samples by machine.

[0024] (2) Observe the sample with parallel light. Disable the polarizer and analyzer, pull out the polarizer, switch to the bright field imaging mode, observe the surface of the sample with the parallel light of the microscope, adjust the microscope imaging mode to color, adjust the magnification to 200 times as needed, find the object to observe the target area;

[0025] (3) Observe the sample with polarized light. Use the polarizer and ana...

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Abstract

The invention discloses a method for distinguishing red scale and red corrosion products of hot-rolled steel, comprising the following steps: sample preparation: cutting the hot-rolled steel with red surface into individual samples; using parallel light to find the target area: using Observe with a microscope with polarizer and analyzer, draw out the polarizer during observation, stop using the polarizer and analyzer, switch the microscope to bright field imaging mode, observe the surface or section of the sample, and adjust the microscope imaging mode For color, adjust the magnification to find the target area; use polarized light to observe the target area: push the polarizer to the bottom of the microscope, enable the polarizer and analyzer, switch the microscope to polarized light imaging mode, adjust the microscope polarizer and detector The polarizers are in an orthogonal state, and the target area is photographed with orthogonally polarized light to obtain a polarized image; the results are classified. The method can quickly distinguish the types of red substances on the surface, and the test time is short.

Description

technical field [0001] The invention relates to a steel analysis and detection method, in particular to a method for distinguishing red oxide scales and red corrosion products of hot-rolled steel. Background technique [0002] Hot-rolled steel will corrode during shipping or storage, and the surface oxide scale has a great influence on the corrosion resistance of the matrix, which is closely related to the microstructure and chemical composition of the oxide scale itself. Studies have shown that the oxide skin phases are FeO, Fe 3 o 4 and Fe 2 o 3 , whose color states are blue, black, red. If the scale is red Fe formed at high temperature 2 o 3 At the same time, hot-rolled steel is in contact with production water, or yellow or red corrosion products are formed during placement in humid air, it is difficult to distinguish the cause of the red substance. When hot-rolled steel leaves the factory, it generally has strict surface quality requirements, and it is usually no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N1/28
CPCG01N1/286G01N21/84G01N2001/2873
Inventor 蔡佳兴代芹芹范益陈林恒赵柏杰
Owner NANJING IRON & STEEL CO LTD
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