Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for distinguishing red oxide skin and red corrosion product 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: 2019-08-27
NANJING IRON & STEEL CO LTD
View PDF7 Cites 1 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for distinguishing red oxide skin and red corrosion product of hot rolled steel
  • Method for distinguishing red oxide skin and red corrosion product 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for distinguishing red oxide skin and a red corrosion product of hot rolled steel. The method comprises the steps of preparing samples: cutting the hot rolled steel with red substances on the surface into single samples; searching for a target area by adopting parallel light: carrying out observation by using a microscope with a polarizer and a polarization analyzer, drawing out the polarizer during the observation, stopping use of the polarizer and the polarization analyzer, switching the microscope to be in a bright field imaging mode, observing the surfacesor sections of the samples, adjusting an imaging mode of the microscope to be a color mode, and adjusting a magnification factor to find the target area; observing the target area by adopting polarized light: pushing the polarizer to the bottom of the microscope, starting use of the polarizer and the polarization analyzer, switching the microscope to be in a polarized light imaging mode, adjustingthe polarizer and the polarization analyzer of the microscope to be in an orthogonal state, and shooting the target area by adopting orthogonal polarized light to obtain a polarized light picture; and classifying results. According to the method, the types of the red substances on the surface can be rapidly distinguished, 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com