CN1031419C - Cleaning method for surface of stainless steel to get bright appearance - Google Patents
Cleaning method for surface of stainless steel to get bright appearance Download PDFInfo
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- CN1031419C CN1031419C CN 92100200 CN92100200A CN1031419C CN 1031419 C CN1031419 C CN 1031419C CN 92100200 CN92100200 CN 92100200 CN 92100200 A CN92100200 A CN 92100200A CN 1031419 C CN1031419 C CN 1031419C
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- steel
- stainless steel
- aqueous solution
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Abstract
The present invention relates to a peeling method making a stainless steel surface silvery and bright, which is especially suitable for the production process of stainless steel cold drawn materials. The method can be used for steel containing nickel and chromium, and is free from the limitation of steel shapes. The present invention is fundamentally characterized in that steel is soaked in a prewashing solution for 10 to 30 minutes, and heated to 800 to 120 DEG C in a furnace for 0.5 to 2.5 hours; after the steel is discharged from the furnace, iron scale can automatically fall off in water or air cooling, so the surface of the steel is silvery and bright.
Description
The invention relates to a process method for removing iron sheet on the surface of stainless steel and enabling the surface to present a silvery and bright effect.
In the production of stainless steelcold-drawn materials, two conditions must be met for realizing cold drawing: one is that the blank must be annealed in a furnace to soften it; and the other is that the iron scale on the surface of the steel material formed by softening must be removed so as to coat a proper amount of cold-drawing lubricating layer on the surface of the steel material. At present, two methods are commonly used for removing the oxide scales on the surface of the stainless steel, wherein the first method is to grind the oxide scales of the steel after heat treatment by a coreless grinding machine after rough correction and fine correction; the second is to use molten sodium hydroxide and sodium nitrate (ratio is 7: 3, heating to 400-550 ℃) for alkali boiling, water quenching and acid pickling for peeling after heat treatment. The first method has the disadvantages of multiple working procedures, high noise and high cost, and is more difficult to implement especially when the blank has larger ovality; the second method has the disadvantages that the working environment is polluted by acid gas and has large irritation to skin, and the alkali tank is frequently damaged. Therefore, both methods have limitations in industrial production. Chemical methods for removing stainless steel scale have been reported at home and abroad, for example: 87105097, the pickling agent for removing the oxide layer on the surface of stainless steel is only suitable for hot-rolled plates and sections, and the concentrated acid component is still remained in the pickling agent.
The invention aims to provide a reliable process which is simple and easy to implement and can thoroughly remove the iron scale on the surface of stainless steel.
The specific contents are as follows: preparing saturated aqueous solution of potassium permanganate, sodium hydroxide and sodium nitrate, heating the aqueous solution to 70-90 ℃, soaking the steel in the aqueous solution for 10-30 minutes before the steel is softened by furnace heat treatment, and then performing furnace heat treatment. In the heat treatment process, under the high temperature condition of 800-:
the reaction destroys the compactness of spinel type iron scale on the surface of stainless steel, so that the iron scale becomes loose and naturally loosens in quenching or air cooling after heat treatment, and then the iron scale on the surface of steel can be completely removed by only slightly adding acid washing in common sulfuric acid solution (without any additive). The steel material has a bright and clean surface after the process.
Compared with the commonly used peeling process, the method has the advantages of strong capability of removing the oxide skin, short time, low cost, no pollution, simple and convenient operation and the like.
The invention can be used for peeling stainless steel, and is also applicable to other nickel-chromium-containing steel grades without being limited by the shape of steel.
Example 1:
removal of 5Cr21Mn9Ni4Surface scale of N Steel (438 batches), the steel was treated with NaOH and NaNO3、NaCl、KMnO3Soaking in water solution for 10-30 min, solid-dissolvingin high-temperature solid-dissolving furnace for 2.5 hr, cooling with water to remove scale, and acid washing2SO4The solution has the concentration of 15-20 percent and the temperature of 70-90 ℃ and the surface of the steel presents silver bright color.
Example 2:
removal of 4Cr9Si2Iron scale on the surface of steel: the steel material is added with NaOH and NaNO3、KMnO3Soaking in water solution for 20 min, heating in a furnace at 880 + -10 deg.C for half an hour, discharging, air cooling, pickling for 2.5 hr, cooling with water to remove scale, and pickling (H)2SO4The solution has the concentration of 15-20 percent and the temperature of 70-90 ℃ and the iron sheet on the surface of the steel is completely peeled off and presents silver bright color.
Example 3:
compared with the prior peeling method, the invention has the following advantages:
the original peeling process comprises the following steps: the working procedure of 11-roller straightening → large two-roller polishing → coreless grinding by a grinder is three steps, wherein the grinding consumes 2% of the blank and the scrappage is about 8%.
The process of the invention is that the blank is soaked in prewashing aqueous solution for 10-30 minutes, and then is annealed in a furnace, and then peeled by water cooling or air cooling, the process only has one step, and the peeling consumption is not about 1.2%. Substantially no irritating odor is present in the aqueous solution at 70-90 deg.C.
Claims (2)
1. A method for peeling stainless steel surface to obtain silvery bright surface includes immersing blank in saturated aqueous solution of potassium permanganate, sodium hydroxide and sodium nitrate, annealing or solid solution treatment, and removing iron oxide scale from the blank by natural falling off in water or air cooling.
2. The method as claimed in claim 1, wherein the saturated aqueous solution is prepared at a temperature of 70-90 ℃, the steel is etched in the saturated aqueous solution for 10-30 minutes and then is subjected to furnace heat treatment at an annealing temperature of 800-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100200 CN1031419C (en) | 1992-01-08 | 1992-01-08 | Cleaning method for surface of stainless steel to get bright appearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100200 CN1031419C (en) | 1992-01-08 | 1992-01-08 | Cleaning method for surface of stainless steel to get bright appearance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1063124A CN1063124A (en) | 1992-07-29 |
| CN1031419C true CN1031419C (en) | 1996-03-27 |
Family
ID=4938427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92100200 Expired - Fee Related CN1031419C (en) | 1992-01-08 | 1992-01-08 | Cleaning method for surface of stainless steel to get bright appearance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031419C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105297045B (en) * | 2015-11-23 | 2017-11-07 | 佛山市高明俊品金属制品有限公司 | A kind of stainless steel pipe surface cleaning method |
| CN105586603B (en) * | 2015-11-23 | 2018-10-09 | 佛山市高明俊品金属制品有限公司 | A kind of stainless steel oxidation skin minimizing technology |
| CN109207930A (en) * | 2018-08-31 | 2019-01-15 | 江苏鼎启科技有限公司 | A kind of surface of metal product processing method |
| CN112064043B (en) * | 2020-09-07 | 2022-05-27 | 北京首钢吉泰安新材料有限公司 | Method for removing oxide film on surface of iron-chromium-aluminum wire rod and heating container |
-
1992
- 1992-01-08 CN CN 92100200 patent/CN1031419C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1063124A (en) | 1992-07-29 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |