CN86101533A - The method of testing of chromium bearing steel hot rolling microstructure band shape - Google Patents
The method of testing of chromium bearing steel hot rolling microstructure band shape Download PDFInfo
- Publication number
- CN86101533A CN86101533A CN86101533.9A CN86101533A CN86101533A CN 86101533 A CN86101533 A CN 86101533A CN 86101533 A CN86101533 A CN 86101533A CN 86101533 A CN86101533 A CN 86101533A
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- China
- Prior art keywords
- bearing steel
- etching pit
- reagent
- chromium bearing
- hot rolling
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- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Theme of the present invention is relevant metallography technical field of measurement and test.Adopt a kind of new etching pit reagent to show the structural banding of chromium bearing steel hot-rolled state, start a simple new detection approach for the quality control of bearing steel, also helped to control the qualification rate of research, control and the raising annealing bearing steel carbide strip of bearing steel annealed condition carbide strip quality.New etching pit reagent is by sodium molybdate (Na
2MO
42H
2O), distilled water (H
2O), nitric acid (HNO
3), ammonium bifluoride compositions such as (NH4FHF) is formulated.This method can be widely used in the production of steel mill's bearing steel, and detection department also is applicable to the detection department of the manufacturing factory of each class bearing.
Description
The method of testing of metal structure belongs to the metallography technical field.A kind of new etching pit reagent that is adopted in this method of testing belongs to the application technology of chemical deposited film.
When showing that the steel hot rolling state is organized, generally all adopt nitric acid-alcohol or picric acid-alcoholic solution, but all can not demonstrate its banded structure well.D33 regulation in the technical standard of the time-honored Sweden SKF of world's famous brand bearing steel: adopt a kind of satisfactory mordant, normally salpeter solution shows that usefulness 90 ml ethanols and 10 milliliters of red fuming nitric acid (RFNA)s of its carbide network and banded structure (series 5～7) (CZ5～7) carry out deep-etching.
The present inventor is in daily production practices process, the carbonide of finding the bearing steel annealed condition has defective phenomenon, associate the structural banding of its hot-rolled state of check thus, be intended to adopt a kind of new etching pit reagent, taking this can the clearly colored structural banding that demonstrates chromium bearing steel hot-rolled state.The research work of the structural banding of relevant hot-rolled state is looked into newly according to available data, does not also carry out as yet.
As everyone knows, the formation reason of carbide strip in the chromium bearing steel mainly is because steel ingot extends to the zone of enrichment of carbonide during in hot-working in cast, the dendritic segregation that forms in the process of setting, becomes the carbide strip form at last and distributes.Therefore we can say that bearing steel also exists same structural banding in the longitudinal tissue after the hot rolling.
Almost the metallographic structure method of testing of all metals all be unable to do without etching pit reagent.A kind of new etching pit reagent that shows chromium bearing steel hot rolling microstructure band shape is by sodium molybdate (Na
2MoO
42H
2O), distilled water (H
2O), nitric acid (HNO
3), ammonium bifluoride (NH
4FHF) etc. composition is formed, and its matching method is: get 0.5～1.5 gram sodium molybdate (Na
2MoO
42H
2O) be dissolved in 100 milliliters distilled water or tap water (H
2O) in, wait to dissolve the nitric acid (HNO that the back adds 0.5～1.5 milliliter
3) this moment solution be faint yellow weakly acidic solution, add 2～8 gram ammonium bifluoride (NH again
4FHF).
The new etching pit reagent that said method is mixed with, its using method is as common etching pit reagent, hot-rolled state sample to be measured through grind, after the conventional preparation such as polishing, carrying out corrosion in 1.5～2 minutes with this reagent is to the surface and has macroscopic obvious slice-group to be woven to end, place sample microscopically (100 times get final product) to observe then, just can see on the matrix that the fine pearlite band tissue with color is distributed in the coarse pearlity that is black (seeing figure).This reagent can both demonstrate the structural banding of different in width effectively to the chromium bearing steel of various different sizes, and its susceptibility is strong, and reproducibility is also good.
The employing of new etching pit reagent has been started simple new detection approach for showing chromium bearing steel hot-rolled state longitudinal tissue band shape.As everybody knows, the carbide strip rank of bearing steel is one of main performance assessment criteria of bearing steel quality, and exist mutual corresponding relation between the banded carbide strip with its annealed condition of the longitudinal tissue of hot-rolled state, because the both is the segregated zone of rich carbon, Fu Ge.The discovery of this corresponding relation helps to control the quality of annealed condition carbide strip, bearing steel is carried out the control of carbide strip rank have practical value in actual production process.We can check directly that the width of the structural banding of its hot-rolled state gives the rank of choosing (showing) steel annealing state carbide strip, thereby successfully improve the first-time qualification rate of bearing steel finished steel annealed condition carbide strip, it is to shortening the production cycle, energy efficient, it is all very favourable to increase economic benefit.
Passed through a large amount of contrast tests, it is corresponding relation between the rank of the width of hot rolling state group ribbon shape and annealed condition carbide strip, done simultaneously demonstration test abreast, on the basis of accumulation data, drawn the corresponding relation such as the following table of rank of the carbide strip of the width of structural banding of bearing steel hot-rolled state and its annealed condition:
Table 1
Realize the present invention, as long as handle by above-mentioned preparation technology and metallographic test specification.
Be three embodiment below:
Claims (3)
1, a kind of etching pit reagent that is used for the chromium bearing steel is characterized in that being used to show the hot rolling microstructure band shape of chromium bearing steel.
2, etching pit reagent according to claim 1, the composition of this reagent is by sodium molybdate (Na
2MoO
42H
2O), distilled water (H
2O), nitric acid (HNO
3), ammonium bifluoride (NH
4Composition such as FHF).
3, according to the preparation method of claim 1 and 2 described etching pit reagent, its proportioning components is as follows:
Na
2MoO
42H
2O 0.5～1.5 gram
H
2100 milliliters of O
HNO
30.5～1.5 milliliters
NH
4FHF 2～8 grams
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86101533 CN1011915B (en) | 1986-07-29 | 1986-07-29 | Corrosion reagent to display the structural banding of chrominium bearing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86101533 CN1011915B (en) | 1986-07-29 | 1986-07-29 | Corrosion reagent to display the structural banding of chrominium bearing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86101533A true CN86101533A (en) | 1987-02-11 |
| CN1011915B CN1011915B (en) | 1991-03-06 |
Family
ID=4801433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86101533 Expired CN1011915B (en) | 1986-07-29 | 1986-07-29 | Corrosion reagent to display the structural banding of chrominium bearing steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1011915B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102822668A (en) * | 2010-02-01 | 2012-12-12 | 梅西耶-布加蒂-道提公司 | Non-destructive method for detecting machining burns of a very-high-strength steel, and colour chart for calibrating machining burns of said steel |
| CN111830229A (en) * | 2020-07-12 | 2020-10-27 | 首钢集团有限公司 | Metallographic corrosive agent for primary banded structure of steel and metallographic display method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101144762B (en) * | 2006-09-13 | 2010-05-12 | 鞍钢股份有限公司 | Corrosive agent for displaying silicon steel coagulation tissue and its preparation method |
-
1986
- 1986-07-29 CN CN 86101533 patent/CN1011915B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102822668A (en) * | 2010-02-01 | 2012-12-12 | 梅西耶-布加蒂-道提公司 | Non-destructive method for detecting machining burns of a very-high-strength steel, and colour chart for calibrating machining burns of said steel |
| CN111830229A (en) * | 2020-07-12 | 2020-10-27 | 首钢集团有限公司 | Metallographic corrosive agent for primary banded structure of steel and metallographic display method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1011915B (en) | 1991-03-06 |
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