Method for measuring nonmetallic inclusion in steel

Inactive Publication Date: 2012-08-01
DONGGUAN KELEE STEEL WIRE
View PDF4 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this prior art is: adopt common metallographic sample, its surface roughness is relatively low, may cause a large amount of inclusions to peel off, or cause serious " trailing " phenomenon and phase boundary unclear, for accurately observing inclusions The distribution, size and shape of the
The disadvantages of this prior art are: 1), the measurement standard adopted is American ASTME768 standard, which is different from the Chinese national standard; 2), because the plasticine is soft and non-rigid, it will have an impact on the stability of the formed image, It is not e

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The method for measuring non-metallic inclusions in steel of the present invention comprises the following steps: (1) Sampling: intercept the sample along the rolling direction or the stretching direction, so that the polished surface area of ​​the sample is 50mm 2 ;(2) Mounting: Put the intercepted sample flat into the mounting machine, put bakelite powder filler, set the temperature at 130±5°C, close the mounting machine, pressurize and keep warm for 5 minutes to form the sample; (3) Grinding: Grind the inlaid sample on the water-grinding sandpaper of the grinder. The water-grinding sandpaper is ground from coarse (80 mesh) to fine (1500 mesh) water-grinding sandpaper to grind off the deformed layer on the surface of the sample until The surface of the sample is smooth; (4) Polishing: the sample is polished on the polishing cloth of the polishing machine, and the polishing liquid is used for polishing. Make the grinding surface a smooth mirror surface without scratche...

Embodiment 2

[0061] The method for measuring non-metallic inclusions in steel of the present invention comprises the following steps: (1) Sampling: intercept the sample along the rolling direction or the stretching direction, so that the polished surface area of ​​the sample is 54mm 2 ;(2) Mounting: Put the intercepted sample flat into the mounting machine, put bakelite powder filler, set the temperature at 130±5°C, close the mounting machine, pressurize and keep warm for 8 minutes to form the sample; (3) Grinding: Grind the inlaid sample on the water-grinding sandpaper of the grinder. The water-grinding sandpaper is ground from coarse (80 mesh) to fine (1500 mesh) water-grinding sandpaper to grind off the deformed layer on the surface of the sample until The surface of the sample is smooth; (4) Polishing: Polish the sample on the polishing cloth of the polishing machine. Polishing liquid is used for polishing. Make the grinding surface a smooth mirror surface without scratches, and the po...

Embodiment 3

[0063] The method for measuring non-metallic inclusions in steel of the present invention comprises the following steps: (1) Sampling: intercept the sample along the rolling direction or the stretching direction, so that the polished surface area of ​​the sample is 54mm 2 ; (2) Mounting: Put the intercepted sample flat into the mounting machine, put in the electric jade powder filler, set the temperature at 120±5°C, close the mounting machine, pressurize and keep warm for 10 minutes to form the sample; (3 ) Grinding: Grind the inlaid sample on the water-grinding sandpaper of the grinder. The water-grinding sandpaper is ground from coarse (80 mesh) to fine (1500 mesh) water-grinding sandpaper to grind off the deformed layer on the surface of the sample. Until the surface of the sample is smooth; (4) Polishing: Polish the sample on the polishing cloth of the polishing machine, and use polishing liquid for polishing during polishing. , so that the grinding surface becomes a smoot...

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

No PUM Login to view more

Abstract

The invention relates to the technical field of measurement of nonmetallic inclusion, and in particular relates to a method for measuring nonmetallic inclusion in steel. The method comprises the following steps of: (1) sampling; (2) embedding; (3) grinding; (4) polishing; (5) cleaning; (6) corroding; and (7) carrying out microscopic metallurgic detection. The method for detecting the nonmetallic inclusion has the advantages of simplicity in operation, mature process and high measurement accuracy of the inclusion, and can meet the using requirements of most manufacturers in China.

Description

technical field [0001] The invention relates to the technical field of measuring non-metallic inclusions, in particular to a method for measuring non-metallic inclusions in steel. Background technique [0002] During the steelmaking process, a small amount of slag, refractory materials and reaction products during smelting may enter molten steel to form non-metallic inclusions. They will reduce the mechanical properties of steel, especially reduce the plasticity, toughness and fatigue limit. In severe cases, they will also cause cracks in the steel during hot working and heat treatment or suddenly brittle fracture during use. Non-metallic inclusions can also promote the formation of hot-processed fibrous and banded structures in steel, making the material anisotropic. In severe cases, the transverse plasticity is only half of the longitudinal plasticity, and the impact toughness of the steel is greatly reduced. Although the content of non-metallic inclusions in steel is sma...

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): G01N21/88G01N1/28
Inventor 刘金泉
Owner DONGGUAN KELEE STEEL WIRE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap