CN100368793C - Method for detecting net type carbide of bearing semi-finished product by annealing corroding method - Google Patents
Method for detecting net type carbide of bearing semi-finished product by annealing corroding method Download PDFInfo
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- CN100368793C CN100368793C CNB2004100828780A CN200410082878A CN100368793C CN 100368793 C CN100368793 C CN 100368793C CN B2004100828780 A CNB2004100828780 A CN B2004100828780A CN 200410082878 A CN200410082878 A CN 200410082878A CN 100368793 C CN100368793 C CN 100368793C
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Abstract
The present invention relates to a method for detecting a net type carbide of bearing steel in the process of annealing operation by heat treatment, which comprises the specific steps: a test sample is put in an alkaline sodium picrate solution to be boiled for 12 minutes to 18 minutes after the test sample is polished, the boiled test sample is flushed by clear water after being taken out and is observed by a microscope after being dried by blowing, and the black net type carbide is clearly and easily seen. The severest viewing field is found to be graded by comparison, wherein the alkaline sodium picrate solution comprises the components of picric acid, sodium hydroxide and water, wherein the weight ratio of the picric acid to the sodium hydroxide to the water is 1:5:20. The best effect is obtained when 5 g of picric acid, 25 g of sodium hydroxide and 100 g of water are selected to be used as the components of the alkaline sodium picrate solution.
Description
Technical field
The present invention relates to a kind of in heat-treatment of annealing operation process the method for check bearing steel mesh shape carbonide, especially a kind of method with annealing etch check bearing semi-manufacture net carbide.
Background technology
After adopting heating quenching, bearing parts net carbide after the bearing industry annealing at present corrodes through 4% nital, the check net carbide, this kind method must be with the bearing parts heating quenching, and bearing parts is waited for check result at annealing furnace, if qualified, can large quantities ofly process.This method has been wasted a large amount of energy, influence manufacturing schedule, the semi-manufacture annealing net carbide of bearing industry checks physics and chemistry chamber, main dependence center to carry out, all there be every day 3-10 sample to need the not timing chemical examination, all need drive electric furnace like this every day quenches, waste a large amount of electric energy and manpower, and each round of visits needs 4 hours, normal production of influence and technology adjustment approximately.Press for a kind of new method and replace it.
For this reason, through long-term a large amount of work, we test out a kind of is power saving, saving of labor, the timesaving method of inspection picric acid etch check net carbide of promptly annealing again.
Summary of the invention
Purpose of the present invention just provides a kind of method with annealing etch check bearing semi-manufacture net carbide, replaces the method for existing quench method check bearing semi-manufacture net carbide.This method can shorten proving time and round of visits, reduces inspection cost.
Technical solution of the present invention is, a kind of method with annealing etch check bearing semi-manufacture net carbide, the concrete operations step of this method is, after the sample polishing, put into the alkaline picric acid sodium solution and boiled 12-18 minute, take out the back flushing with clean water, after drying up, use microscopic examination, net carbide is black, and is clear and easy to see.Find out the most serious visual field, net carbide after workpiece after the annealing corrodes with picric acid is graded by corresponding picture rank with the net carbide in the JB1255-2001 standard of being formulated with the corrosion of quench method nitric acid, wherein, each component of alkaline picric acid sodium solution and weight ratio are picric acid: NaOH: water is 1: 5: 20.Each composition weight of selecting the alkaline picric acid sodium solution is picric acid 5 grams, NaOH 25 grams, and during water 100 grams, effect is best.
The net carbide of bearing steel generally be the carbonide uneven distribution that makes of the composition influence by Cr and final forging temperature is too high and cooling velocity too slowly and factor such as annealing temperature height cause.In the spheroidizing process, disrumpent feelings and nodularization can take place in net carbide.Because net carbide is often thick than the carbide platelets in the lamellar pearlite, so the time of nodularization process is longer, and the particle of carbonide is bigger, often is polygon, also may be sometimes: one: font and " people " font.
The GCr15 steel can obtain suitable hardness (179HB) and satisfied nodulizing grade (2-3 level) after general normal spheroidizing, and carbonide quantity accounts for about 18%.And the GCr15 steel does not dissolve carbonide quantity and accounts for about 7-8% after 840 ℃ of quenchings.This explanation has a small part carbonide, particularly net carbide to be dissolved into again in the austenite in quenching heating process again, makes that netted continuity and the closure when the netted ratio in quenching back is annealed makes moderate progress, and has alleviated net level.Netted qualified sample must be qualified after quenching when therefore annealing.Annealing etch workpiece does not need to quench, and only needs with the alkaline picric acid sodium solution as mordant.It can make the net carbide blackening, and the be stale-proof test of losing capital is found out when annealing net carbide and the rank corresponding relation of net carbide when quenching by repeatedly practising demonstration to matrix.Table 1 is the contrast of the corresponding quenching nitric acid of same sample annealing picric acid corrosion net carbide rank deep etch net carbide rank, the net carbide rank of same as can be known from Table 1 sample under annealed condition matches than the result of serious 0.5-1 level of the net carbide rank under the as-quenched and theoretical explanation.From daily metal lographic examination, the net carbide rank under the general normal condition is all about the 1-3 level, so this kind method utilization factor is high.And do not equal or exceed 2.5 grades sample for netted carbide grade under the annealed condition, the check net carbide rank of can quenching.This kind method has been guaranteed the rationality and the accuracy of check.
| Annealing picric acid etch net carbide rank | Corresponding quenching nitric acid deep etch net of justice shape carbonide rank | ||
| The net carbide rank | Sample quantities (individual) | The net carbide rank | Sample quantities (individual) |
| 1 | 117 | 0.5 | 117 |
| 2 | 258 | 1 | 150 |
| 1.5 | 108 | ||
| 3 | 43 | 2 | 31 |
| 2.5 | 12 | ||
| 4 | 4 | 3 | 3 |
| 3.5 | 1 | ||
| 5 | 2 | 4 | 2 |
Table 1
The invention has the beneficial effects as follows: corrode net carbide with picric acid under the annealed condition, clear and easy to see, judge that rank is accurate, save proving time and cycle, owing to reduce the supply delay time of opening in electric furnace time and the production run, therefore, can save the energy, reduce cost.
Embodiment
Alkaline picric acid sodium solution component and ratio: picric acid 5 grams, play the oxygenant effect; NaOH 25 grams play the chemical stain effect; Water plays diluting effect for 100 milliliters.
Specific operation process: after the sample polishing, put into the alkaline picric acid sodium solution and boiled 15 minutes, take out the back flushing with clean water, dry up the back and observe with 500 power microscopes, net carbide is black, and is clear and easy to see.Find out the most serious visual field, compare grading by the JB1255-2001 standard.
Claims (2)
1. method with annealing etch check bearing semi-manufacture net carbide, it is characterized in that, the concrete operations step of this method is, after the sample polishing, putting into the alkaline picric acid sodium solution boiled 12-18 minute, take out the back flushing with clean water, after drying up, use microscopic examination, net carbide is a black, clear and easy to see, find out the most serious visual field, the net carbide after the workpiece after the annealing corrodes with picric acid is graded by corresponding picture rank with the net carbide in the JB1255-2001 standard of being formulated with the corrosion of quench method nitric acid, wherein, each component of alkaline picric acid sodium solution and weight ratio are picric acid: NaOH: water is 1: 5: 20.
2. a kind of method with annealing etch check bearing semi-manufacture net carbide according to claim 1 is characterized in that each component and the weight of described alkaline picric acid sodium solution are: picric acid 5 grams, NaOH 25 grams, water 100 grams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100828780A CN100368793C (en) | 2004-12-05 | 2004-12-05 | Method for detecting net type carbide of bearing semi-finished product by annealing corroding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100828780A CN100368793C (en) | 2004-12-05 | 2004-12-05 | Method for detecting net type carbide of bearing semi-finished product by annealing corroding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1616952A CN1616952A (en) | 2005-05-18 |
| CN100368793C true CN100368793C (en) | 2008-02-13 |
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| CNB2004100828780A Active CN100368793C (en) | 2004-12-05 | 2004-12-05 | Method for detecting net type carbide of bearing semi-finished product by annealing corroding method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749280A (en) * | 2012-07-31 | 2012-10-24 | 内蒙古包钢钢联股份有限公司 | Method for measuring corrosion performance of materials |
| CN103308514B (en) * | 2013-05-09 | 2015-08-19 | 中原特钢股份有限公司 | A kind of method adopting annealed state normal temperature etch testing tool steel carbonide unevenness |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05163590A (en) * | 1991-12-13 | 1993-06-29 | Nippon Steel Corp | Etching solution for steel material with composite structure and etching method |
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- 2004-12-05 CN CNB2004100828780A patent/CN100368793C/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05163590A (en) * | 1991-12-13 | 1993-06-29 | Nippon Steel Corp | Etching solution for steel material with composite structure and etching method |
Non-Patent Citations (5)
| Title |
|---|
| GCr15钢网状碳化物细化工艺. 苗乃元.轴承，第12期. 1998 * |
| 关于正确评定带状炭化物的试验小结. 陈琪璋.轴承，第3期. 1964 * |
| 长时间加热对18-8钢组织和性能的影响. 袁文剑.材料工程，第4期. 1958 * |
| 高碳铬轴承奥氏体晶粒度显示. 樊爱民等.轴承，第4期. 1986 * |
| 高碳铬轴承奥氏体晶粒度的显示方法及其应用. 孙希坤等.轴承，第6期. 1979 * |
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