CN102218392B - Method for repairing surface crack of continuous casting loop-forming element - Google Patents
Method for repairing surface crack of continuous casting loop-forming element Download PDFInfo
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- CN102218392B CN102218392B CN 201110103051 CN201110103051A CN102218392B CN 102218392 B CN102218392 B CN 102218392B CN 201110103051 CN201110103051 CN 201110103051 CN 201110103051 A CN201110103051 A CN 201110103051A CN 102218392 B CN102218392 B CN 102218392B
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- annular element
- pasty liquid
- steel billet
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Abstract
The invention discloses a method for repairing the surface crack of a continuous casting loop-forming element. The method comprises the following steps: mixing sodium silicate and silicon dioxide into a pasty liquid with water, and coating the pasty liquid uniformly on the crack part of the surface of a continuous casting billet steel, or coating the pasty liquid uniformly on the whole surface ofthe continuous casting billet steel of the continuous casting loop-forming element, wherein the content of the sodium silicate in the pasty liquid is 20-40wt%, the content of silicon dioxide is 10-30wt%, and the balance of water; and the material of the continuous casting billet steel is Q345E steel. After the continuous casting element is repaired by the method, the quality for manufacturing products by the continuous casting element is improved, and the safety and reliability of the operation for wind power devices are ensured; and the yield of the products caused by crack is improved to more than 99.8% at present from around 60% originally, thus greater influences for improving the economic efficacy of enterprises can be generated.
Description
Technical field
The present invention relates to the method that a kind of cracks of metal surface is repaired, be specifically related to the restorative procedure that a kind of wind power flange is used continuous casting annular element spare face crack.
Background technology
The steel blank that adopts continuous cast method to make in the prior art occurs crackle on its surface through regular meeting.The section of cracking main cause is that foundry goods is in the process of cooling, and is surface-cooled fast, and the surface begins earlier to shrink, and is inner colded slow, inner after-contraction.Because the speed difference of inside and outside contraction, therefore will produce bigger internal stress in the inside of metal, this internal stress can make the metalwork distortion that is distorted, and also can make the surface of metalwork crackle occur, and this crackle had generally just formed before foundry goods does not cool down fully.And in each manufacturing procedure thereafter as technologies such as cutting, forge hot, backing, machineds in above-mentioned crackle will be difficult to be eliminated, people are at a complete loss as to what to do to this crackle at present, generally believe it is metallurgical imperfection, carrying out along with processing technology, the finished product that finally is processed into detects through ultrasonic examination and to be identified as defective work and to scrap.
Be used for connecting the large-sized flange of tower tube in existing wind-powered electricity generation industry, employed material mostly is the Q345E steel greatly, and namely yield strength is 345 E level steel, owing to added some trace elements in the smelting of steel, is beneficial to improve its low temperature toughness.But it is thick also to have brought molten steel to become sticky thus, with the steel billet that this molten steel continuous casting goes out, can more or less occur central pipe and centre burst (being perforation or a section generation) inevitably.And these crackles add and pine at high temperature furnace (1200 ℃), crackle depths expanded by heating, and crackle broadens, CO, CO
2Carry out oxidation reaction generation iron scale (Fe Deng high temperature furnace gas and molten steel
2O
3, Fe
3O
4, FeO), and in the process of subsequent compression, jumping-up, punching, can't remove these center field trashes, then be retained in ring inside, detect the defective that will present band shape or ring-type finally by ultrasonic examination, cause product rejection.Because the size of wind power flange is bigger, general all at 3～5 meters diameter, billet weight is at 2～6 tons.If underproof scrap products often occurs, will cause great waste.Therefore, be necessary above-mentioned rift defect, adopt effective method to be repaired.
Summary of the invention
The objective of the invention is to overcome the defective that exists in the prior art, design and a kind ofly repair the crack that occurs on its surface behind the metalwork continuous casting, thereby improve the qualification rate of product.
For achieving the above object, technical scheme of the present invention has provided a kind of restorative procedure of continuous casting annular element face crack, it is characterized in that, described method comprises sodium metasilicate and silica water furnishing pasty liquid, described pasty liquid is coated in the cracks on described continuous casting steel billet surface equably, or is coated in the whole surface of described continuous casting steel billet equably; Content at described pasty liquid mesosilicic acid sodium is 20～40wt%, and the content of silica is 10～30wt%, and all the other are water.
Because large-sized flange spare can make the bonding reparation of micro-crack in the steel in the process of big ratio of forging reduction, but its prerequisite is that the centre burst place is totally pollution-free.According to this prerequisite, the present invention is by applying coating in cracks, and the steel billet that will have crackle is isolated with furnace gas in heating process, makes it can not generate (Fe
2O
3, Fe
3O
4, FeO) etc. field trash.Therefore the qualification rate of product is greatly enhanced
Optimized technical scheme is in the present invention, and the material of described continuous casting annular element is the Q345E steel.
Further optimized technical scheme is also to be added with micro-niobium, vanadium, titanium in described Q345E steel in the present invention.
Further optimized technical scheme is that described continuous casting annular element is the flange annular element in the present invention.
Further optimized technical scheme is that described surface is the inner surface of continuous casting steel billet cross section in the present invention.
Further optimized technical scheme is in the present invention, described coating is to apply under the condition of normal temperature and pressure, before coating, need the inner surface of continuous casting steel billet is cleaned out, with dust catcher the dirt in the described crackle is exhausted, and then apply described pasty liquid, apply back drying in natural environment.
Advantage of the present invention and beneficial effect are: continuously cast has improved the quality that is processed into product with continuously cast after adopting said method to repair, and has guaranteed the security reliability of wind power equipment operation.The qualification rate that its product causes because of crackle is by original about 60%, brings up to present more than 99.8%.Owing to be used in one 20,000 yuans at least of flanges on the wind-power tower, 5～60,000 yuans at most.Therefore, improve the product quality of flange, reduce percent defective, will produce bigger influence to improving economic benefit of enterprises.
The specific embodiment
Following embodiment is further described the specific embodiment of the present invention.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
The present invention is a kind of restorative procedure of continuous casting annular element face crack, and this method comprises sodium metasilicate (Na
2SiO
3) and silica (SiO
2) water furnishing pasty liquid, described pasty liquid is coated in the cracks on described continuous casting steel billet surface equably, or is coated in the whole surface of described continuous casting steel billet equably; Content at described pasty liquid mesosilicic acid sodium is 30wt%, and the content of silica is 20wt%, and all the other are water.Sodium metasilicate (Na wherein
2SiO
3) water-soluble back forms viscous fluid and be commonly referred to as waterglass, is alkalescence, its fusing point is 1088 ℃ (1291k), silica (SiO
2) fusing point be 1670 ℃, its chemical property is very stable, it is different from quartz sand fine silica powder, bulk density (g/cm
3): 2.65.These two kinds of materials all can be high temperature resistant.
Because large-sized flange spare can make the bonding reparation of micro-crack in the steel in the process of big ratio of forging reduction, but its prerequisite is that the centre burst place is totally pollution-free.According to this prerequisite, the present invention is by applying coating in cracks, and the steel billet that will have crackle is isolated with furnace gas in heating process, makes it can not generate (Fe
2O
3, Fe
3O
4, FeO) etc. field trash.Therefore the qualification rate of product is greatly enhanced
On the basis of above-described embodiment, the material of described continuous casting steel billet is the Q345E steel.
On the basis of above-described embodiment, in described Q345E steel, also be added with micro-niobium, vanadium, titanium.
On the basis of above-described embodiment, described continuous casting steel billet is the blank of flange annular element.
On the basis of above-described embodiment, described surface is the inner surface of continuous casting steel billet.
On the basis of above-described embodiment, described coating is to apply under the condition of normal temperature and pressure, needs the inner surface of annular element is cleaned out before coating, with dust catcher the dirt in the described crackle is exhausted, and then apply described pasty liquid, apply back drying in natural environment.
The above only is preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. the restorative procedure of a continuous casting annular element face crack, it is characterized in that, described method comprises sodium metasilicate and silica water furnishing pasty liquid, described pasty liquid is coated in equably the cracks on described continuous casting steel billet surface, or being coated in the whole surface of described continuous casting steel billet equably, described surface is the inner surface of continuous casting steel billet cross section; Content at described pasty liquid mesosilicic acid sodium is 20～40wt%, and the content of silica is 10～30wt%, and all the other are water.
2. the restorative procedure of continuous casting annular element face crack as claimed in claim 1 is characterized in that, the material of described continuous casting steel billet is the Q345E steel.
3. the restorative procedure of continuous casting annular element face crack as claimed in claim 2 is characterized in that, also is added with micro-niobium, vanadium, titanium in described Q345E steel.
4. the restorative procedure of continuous casting annular element face crack as claimed in claim 3 is characterized in that, described continuous casting steel billet is the blank of flange annular element.
5. as the restorative procedure of any described continuous casting annular element face crack in the claim 1 to 4, it is characterized in that, described coating is to apply under the condition of normal temperature and pressure, before coating, need the inner surface of annular element continuous casting steel billet is cleaned out, with dust catcher the dirt in the described crackle is exhausted, and then apply described pasty liquid, apply back drying in natural environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110103051 CN102218392B (en) | 2011-04-25 | 2011-04-25 | Method for repairing surface crack of continuous casting loop-forming element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110103051 CN102218392B (en) | 2011-04-25 | 2011-04-25 | Method for repairing surface crack of continuous casting loop-forming element |
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| CN102218392A CN102218392A (en) | 2011-10-19 |
| CN102218392B true CN102218392B (en) | 2013-09-11 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907552A (en) * | 2015-06-02 | 2015-09-16 | 遵义金业机械铸造有限公司 | Casting gap repairing device |
| CN110238007B (en) * | 2019-07-19 | 2023-10-10 | 吴忠仪表有限责任公司 | Preparation method of cladding coating on surface of ball core of high-end ball valve and cooling device for preparation |
| CN114538790A (en) * | 2021-12-31 | 2022-05-27 | 安徽登云玻璃科技有限公司 | Method for treating inner surface of warm glass container and glass container |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007734A (en) * | 2006-01-26 | 2007-08-01 | 宝山钢铁股份有限公司 | High temperature-resistant coating material for hot continuous rolling steel billet or continuous rolling blank |
| CN101585988A (en) * | 2008-05-22 | 2009-11-25 | 徐芗明 | A kind of high-temperature resistant coating and preparation method thereof |
-
2011
- 2011-04-25 CN CN 201110103051 patent/CN102218392B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007734A (en) * | 2006-01-26 | 2007-08-01 | 宝山钢铁股份有限公司 | High temperature-resistant coating material for hot continuous rolling steel billet or continuous rolling blank |
| CN101585988A (en) * | 2008-05-22 | 2009-11-25 | 徐芗明 | A kind of high-temperature resistant coating and preparation method thereof |
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Address after: 214423 A zone, European Industrial Park, Zhouzhuang Town, Jiangsu, Jiangyin, China Applicant after: JIANGYIN HENGRUN HEAVY INDUSTRY CO., LTD. Address before: 214423 A zone, European Industrial Park, Zhouzhuang Town, Jiangsu, Jiangyin, China Applicant before: Jiangyin Hengrun Flange Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: JIANGYIN HENGRUN FLANGE CO., LTD. TO: JIANGYIN HENGRUN HEAVY INDUSTRY CO., LTD. |
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