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Method for evaluating grain size in high-chromium steel roller

An evaluation method and high-chromium steel technology, which are applied in the preparation of test samples, testing of moving fluids/granular solids, etc., can solve the problems of cumbersome etching solution preparation process, complex etching solution components, and long time consumption. To achieve the effect of uniform force, fast detection and easy operation

Inactive Publication Date: 2019-03-29
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of the etching solution in this method is complicated, the preparation process of the etching solution is cumbersome, and heat treatment is required before the preparation of metallographic samples. The whole process takes a long time and is inefficient.

Method used

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  • Method for evaluating grain size in high-chromium steel roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for evaluating grain size in a high chromium steel roll, comprising the steps of:

[0037] A. First place the high chromium steel roll in the roll freezing equipment and freeze it for 3 hours at a freezing temperature of -15°C. Select the outer ring of the roll body at the top end for cutting and cut it into sample blocks of 20mm×15mm×70mm. Select the sample block close to One side of the core is subjected to coarse grinding and fine grinding. During coarse grinding, the speed of the grinding disc is 300rpm. First, grind with 200# silicon carbide water-resistant sandpaper for 1 minute, then use 400# silicon carbide water-resistant sandpaper for 2 minutes, and finally use Grind with 600# silicon carbide water-resistant sandpaper for 2 minutes; for fine grinding, the speed of the grinding disc is 200rpm, first grind with 800# aluminum oxide water-resistant sandpaper for 2 minutes, then use 1000# aluminum oxide water-resistant sandpaper for 3 minutes; Polishing ma...

Embodiment 2

[0041] A method for evaluating grain size in a high chromium steel roll, comprising the steps of:

[0042] A. First place the high chromium steel roll in the roll freezing equipment and freeze it for 5 hours at a freezing temperature of -5°C. Select the outer ring of the roll body at the top end for cutting, and cut it into sample blocks of 20mm×15mm×70mm. Select the sample block close to One side of the core is subjected to coarse grinding and fine grinding. During coarse grinding, the speed of the grinding disc is 400rpm. First, grind with 200# silicon carbide water-resistant sandpaper for 2 minutes, then use 400# silicon carbide water-resistant sandpaper for 4 minutes, and finally use Grind with 600# silicon carbide water-resistant sandpaper for 4 minutes; for fine grinding, the speed of the grinding disc is 300rpm, first grind with 800# alumina water-resistant sandpaper for 4 minutes, then use 1000# alumina water-resistant sandpaper for 6 minutes; Polishing machine and pol...

Embodiment 3

[0046] A method for evaluating grain size in a high chromium steel roll, comprising the steps of:

[0047] A. First place the high chromium steel roll in the roll freezing equipment and freeze it for 4 hours, the freezing temperature is -10°C, select the outer ring of the roll body at the top end for cutting, and cut it into sample blocks of 20mm×15mm×70mm, select the sample block close to One side of the core is subjected to rough grinding and fine grinding. During rough grinding, the speed of the grinding disc is 350rpm. First, grind with 200# silicon carbide water-resistant sandpaper for 1 minute, then use 400# silicon carbide water-resistant sandpaper for 3 minutes, and finally use Grind with 600# silicon carbide water-resistant sandpaper for 3 minutes; for fine grinding, the speed of the grinding disc is 250rpm, first grind with 800# alumina water-resistant sandpaper for 2 minutes, then use 1000# alumina water-resistant sandpaper for 4 minutes; Polishing machine and polis...

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Abstract

The invention discloses a method for evaluating grain size in a high-chromium steel roller, and belongs to the technical field of metal material detection. The method comprises the following steps of:A, cutting the high-chromium steel roller into a sample block, and performing rough grinding, fine grinding, and polishing on the sample block to obtain a mirror surface; B, carrying out immersion etching on the mirror surface, and observing the etching degree by using a metallographic microscope; and C, photographing by using the metallographic microscope to evaluate the grain size. The method for evaluating grain size in the high-chromium steel roller can conveniently and quickly analyze the grain size of the high-chromium steel roller to judge whether grain coarseness exists or not, thereby providing important basis for optimizing the high-chromium steel roller preparation process.

Description

technical field [0001] The invention relates to a method for evaluating a metallographic structure, in particular to an evaluation method for grain size, and belongs to the technical field of metal material detection. Background technique [0002] High chromium steel rolls have high hardness, good wear resistance and thermal crack resistance. The oxide film is formed by itself during rolling, which is beneficial to improve the surface quality of the rolled material. High chromium steel rolls have no special water cooling requirements, and have been widely used due to their good performance and service conditions. As we all know, the grain size and uniformity of steel have a great influence on various performance indicators of steel, which is of great significance in actual production. For high chromium steel, the matrix structure is martensite, retained austenite and carbides, and carbides are generally precipitated along the grain boundaries of the grains. Too small grai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N21/85
CPCG01N1/32G01N21/85
Inventor 高鑫
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL