CN104404561B - Method for treating inner pit defect inside continuous rolling carbon steel tube or low-alloy steel tube - Google Patents
Method for treating inner pit defect inside continuous rolling carbon steel tube or low-alloy steel tube Download PDFInfo
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- CN104404561B CN104404561B CN201410728059.2A CN201410728059A CN104404561B CN 104404561 B CN104404561 B CN 104404561B CN 201410728059 A CN201410728059 A CN 201410728059A CN 104404561 B CN104404561 B CN 104404561B
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Abstract
The invention discloses a method for treating inner pit defects inside a continuous rolling carbon steel tube or a low-alloy steel tube. The method comprises the following steps: pickling by using an acid liquid which is prepared from the following components in parts by volume for the first time: 10-15 parts of 33% technical hydrochloric acid, 1-3 parts of nitric acid and 20 parts of water, subsequently performing grinding wheel polishing on the continuous rolling carbon steel tube with inner pit defects or inner pit areas of the low-alloy steel tube, and further pickling for a second time by using another acid liquid which is prepared from the following components in parts by volume: 10-15 parts of 33% technical hydrochloric acid and 20 parts of water, wherein the concentration of FeCl2 in the acid liquids for pickling is controlled to be 35-75g/L each time. By adopting the method of twice pickling and once grinding wheel polishing, the inner pit defects distributed in the inner surfaces of the continuous rolling carbon steel tube and the low-alloy steel tube are eliminated, the quality of the inner surfaces of cold-drawn steel tubes is improved, and the purpose of completely eliminating oxidized iron skin on inner surfaces of steel tubes is achieved.
Description
Technical field
Embodiments of the present invention are related to the metal material field that metallurgical industry is produced, more specifically, implementation of the invention
Mode is related to a kind of processing method of pit defect in tandem rolling carbon steel or low alloy steel steel pipe.
Background technology
Pit defect refers in tandem rolling carbon steel or low alloy steel steel pipe internal-surface in tandem rolling carbon steel or low alloy steel steel pipe
The pit being distributed in banding or sheet that one region occurs.The generation of interior pit defect is mainly with hollow forging except used by iron scale
Except oxidant is relevant, do not conform to when composition, the caking that makes moist except oxidant is injected into after hollow billet endoporus, it is impossible to completely and iron oxide
Skin is reacted, and lump can be formed on the contrary.Equally, when the injection amount except oxidant is unreasonable, will also result in except oxidant and iron oxide
Skin reaction not exclusively forms lump.These lump rolling when be pressed into waste pipe internal surface will be formed steel pipe interior pockmark lack
Fall into.
Interior pit defect is typically distributed in steel pipe internal-surface in longitudinal banding or sheet, appears in the second half section of steel pipe more.
The general color that is dispersed with is in taupe or the foreign matter of grey black in interior pit defect, the foreign matter be except oxidant and iron scale not
The product for reacting completely.
Tandem rolling carbon steel or low alloy steel steel pipe need to carry out pickling to remove the iron oxide of steel pipe internal-surface before cold-drawn is carried out
Skin.Because the foreign matter in interior pit defect is slower with the reaction speed of acid, so when the iron oxide at remaining position of steel pipe internal-surface
After skin has been removed, the iron scale of interior pit defect region is not removed totally yet.Thoroughly to remove interior pit defect place
The iron scale in region, need to further increase pickling time, will so cause the bad result of three below：1st, when interior pit defect
After the iron scale of region is removed totally, other positions occur the excessive erosion phenomenon that degree differs, and will influence cold-drawn
The inner surface quality of steel pipe afterwards.2nd, pickling time will be increased considerably.3rd, because interior pockmark surface is coated with except oxidant and oxygen
Change the product of iron sheet incomplete reaction, so, crevice corrosion will be produced inside interior pockmark in pickling, cause interior pockmark bottom
Corrosion rate is substantially accelerated, and causes the depth of interior pockmark after pickling significantly to be deepened, the inner surface quality of steel pipe after influence cold-drawn.
For the tandem rolling carbon steel or low alloy steel steel pipe that inner surface is dispersed with interior pit defect, should be using corresponding before cold-drawn
Method is processed it, with meet improve cold drawing steel tube quality the need for.
The content of the invention
Instant invention overcomes the deficiencies in the prior art, there is provided pit defect in a kind of tandem rolling carbon steel or low alloy steel steel pipe
The implementation method of processing method, the inner surface quality of steel pipe after cold-drawn can be improved with expectation.
To solve above-mentioned technical problem, one embodiment of the present invention uses following technical scheme：
The processing method of pit defect in a kind of tandem rolling carbon steel or low alloy steel steel pipe, it is comprised the following steps：
A, first time pickling
10~15 parts of concentration of measurement basis first be 33% technical hydrochloric acid, 1~3 part of nitric acid and 20 parts of water it is uniform
Acid solution is mixed with, first time pickling is then carried out to tandem rolling carbon steel or low alloy steel steel pipe, pickling time is 10~25 minutes,
The FeCl of the acid solution is controlled in acid cleaning process2Concentration is 35~75g/L；Tandem rolling carbon steel or low alloy steel is washed away after the completion of pickling
Acid solution on steel pipe；
B, emery wheel reconditioning
Tandem rolling carbon steel or low alloy steel steel pipe by first time pickling is checked, is found out with interior pit defect
Tandem rolling carbon steel or low alloy steel steel pipe simultaneously carries out reconditioning with emery wheel to its interior pockmark region, removes interior pockmark region surface covering
Material, then with high pressure water washing by the tandem rolling carbon steel or low alloy steel steel pipe of emery wheel reconditioning inner surface；
C, second pickling
Then 10~15 parts of concentration of measurement basis are that 33% technical hydrochloric acid and 20 parts of water are uniformly mixed with acid solution,
Then second pickling is carried out to the tandem rolling carbon steel or low alloy steel steel pipe obtained by step B, pickling time is 20~50 minutes, acid
The FeCl of the acid solution is controlled during washing2Concentration is 35~75g/L；Tandem rolling carbon steel or low alloy steel steel is washed away after the completion of pickling
Acid solution on pipe obtains the tandem rolling carbon steel or low alloy steel steel pipe without interior pit defect.
For tandem rolling carbon steel, low alloy steel tube that inner surface is dispersed with interior pit defect, to improve steel pipe after its cold-drawn
Inner surface quality, present invention employs pickling twice and the method for an emery wheel reconditioning.Wherein, the main mesh of first time pickling
Be：Preliminary pickling is carried out to tandem rolling carbon steel, low alloy steel tube, the interior pit defect of steel pipe is found；When pockmark lacks in discovery
After falling into, carry out reconditioning to foregoing interior pit defect with emery wheel, remove in the covering of pit defect surface except oxidant and oxidation
The product of iron sheet incomplete reaction；The main purpose of second pickling is the iron scale for removing steel pipe internal-surface completely.
Because interior pockmark surface is coated with the product except oxidant and iron scale incomplete reaction, therefore, in pickling
Interior pockmark inside will produce crevice corrosion, cause the corrosion rate of interior pockmark bottom substantially to accelerate, and cause interior pockmark after pickling
Depth is significantly deepened.The present invention employs hydrochloric acid with the mixed aqueous solution of nitric acid as pickling solution in first time pickling.Should
Compared with the pickling solution such as the usual hydrochloric acid for using or aqueous sulfuric acid, its acid etching speed dramatically speeds up pickling solution, so that logical
Cross the influence for shortening the time that crevice corrosion occurs to mitigate crevice corrosion.The FeCl of acid solution is controlled in acid cleaning process2Concentration is
35~75g/L can ensure the speed of pickling, shorten pickling time.The present invention can be by changing acid solution or addition hydrochloric acid
To reach control FeCl2The purpose of concentration.
After through first time pickling, the steel pipe internal-surface without interior pit defect is more smooth, and the interior pockmark of steel pipe internal-surface lacks
Place is fallen into, still adheres to the product except oxidant and iron scale incomplete reaction.Because interior pit defect is general in banding or piece
Shape is distributed, so, after detecting by an unaided eye, easily find the interior pit defect of mandrel mill-rolled steel pipe inner surface.In finding after pit defect,
Carry out reconditioning to foregoing interior pit defect with emery wheel, remove in the covering of pit defect surface except oxidant and iron scale not
The product for reacting completely.
Due to the covering of interior pit defect surface except oxidant has been removed with the product of iron scale incomplete reaction, institute
So that in second acid cleaning process, the inside of interior pit defect will not produce crevice corrosion.
Further technical scheme is：The temperature of the first time pickling and second pickling is 60~80 DEG C.
Preferably, the temperature of the first time pickling and second pickling is 70 DEG C.
Further technical scheme is：The pickling time of the first time pickling is 15~20 minutes.
Further technical scheme is：The pickling time of second pickling is 25~30 minutes.
Further technical scheme is：The acid on tandem rolling carbon steel or low alloy steel steel pipe is washed away described in step A and step C
The method of liquid is first to be rinsed with water, then uses high pressure water washing.
Further technical scheme is：The material of interior pockmark region surface covering is except oxidant and company described in step B
Roll the product of the iron scale incomplete reaction on carbon steel or low alloy steel steel pipe.
Compared with prior art, one of beneficial effects of the present invention are：The present invention is repaiied using pickling twice and an emery wheel
The method of mill, had both eliminated the interior pit defect of mandrel mill-rolled steel pipe and the distribution of low alloy stell pipe internal surface, improve steel after cold-drawn
The inner surface quality of pipe, has reached the purpose for removing steel pipe internal-surface iron scale completely again.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
The treatment of interior pit defect before 20# steel mandrel mill-rolled steel pipe cold-drawns
After macro -graph, it is found that specification lacks for the inner surface of the 20# steel mandrel mill-rolled steel pipes of Φ 559 × 18 is dispersed with interior pockmark
Fall into, the processing method taken before the Tube Drawing is as follows：
First time pickling：First time pickling is carried out to 20# steel mandrel mill-rolled steel pipe, the formula of acid solution is：12 parts of measurement basis
Concentration is 33% technical hydrochloric acid, 1 part of nitric acid, (technical hydrochloric acid, nitric acid, the volumetric ratio of water are 12 to 20 parts of water:1:20, mixing is equal
It is even to obtain acid solution), pickling temperature is 60 DEG C, and pickling time is 25 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2Concentration
It is 35~75g/L；After the completion of pickling, 20# steel mandrel mill-rolled steel pipes first are rinsed with water, then with high pressure water washing 20# steel mandrel mill-rolled steel pipes, make
The acid solution obtained on 20# steel mandrel mill-rolled steel pipes is washed away.
Emery wheel reconditioning：20# steel mandrel mill-rolled steel pipes by first time pickling are checked, is found out with interior pit defect
Region, then carries out reconditioning with emery wheel to the region, remove in the covering of pit defect surface except oxidant and iron scale not
The product for reacting completely, then with high pressure water washing by the 20# steel mandrel mill-rolled steel pipes of emery wheel reconditioning inner surface.Interior pit defect table
After what face covered is removed except oxidant and the product of iron scale incomplete reaction by emery wheel reconditioning, 20# steel mandrel mill-rolled steel pipes are passed through again
Second pickling is crossed to can reach completely except the purpose of removing iron scale.
Second pickling：Second pickling is carried out to 20# steel mandrel mill-rolled steel pipe, the formula of acid solution is：12 parts of measurement basis
Concentration is 33% technical hydrochloric acid, (volumetric ratio of technical hydrochloric acid and water is 12 to 20 parts of water:20, well mixed to obtain acid solution), acid
It is 60 DEG C to wash temperature, and pickling time is 50 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2Concentration is 35~75g/L；Acid
After the completion of washing, 20# steel mandrel mill-rolled steel pipes first are rinsed with water, then with high pressure water washing 20# steel mandrel mill-rolled steel pipes so that 20# steel tandem rolling steel
Acid solution on pipe is washed away, and now, 20# steel mandrel mill-rolled steel pipes have been reached completely except the purpose of removing iron scale, and its inner surface do not have
There is interior pit defect.
Embodiment 2
The treatment of interior pit defect before 20# steel mandrel mill-rolled steel pipe cold-drawns
After macro -graph, it is found that specification lacks for the inner surface of the 20# steel mandrel mill-rolled steel pipes of Φ 559 × 18 is dispersed with interior pockmark
Fall into, the processing method taken before the Tube Drawing is as follows：
First time pickling：First time pickling is carried out to 20# steel mandrel mill-rolled steel pipe, the formula of acid solution is：10 parts of measurement basis
Concentration is 33% technical hydrochloric acid, 3 parts of nitric acid, (technical hydrochloric acid, nitric acid, the volumetric ratio of water are 10 to 20 parts of water:3:20, mixing is equal
It is even to obtain acid solution), pickling temperature is 70 DEG C, and pickling time is 20 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2Concentration
It is 35~75g/L；After the completion of pickling, 20# steel mandrel mill-rolled steel pipes first are rinsed with water, then with high pressure water washing 20# steel mandrel mill-rolled steel pipes, make
The acid solution obtained on 20# steel mandrel mill-rolled steel pipes is washed away.
Emery wheel reconditioning：20# steel mandrel mill-rolled steel pipes by first time pickling are checked, is found out with interior pit defect
Region, then carries out reconditioning with emery wheel to the region, remove in the covering of pit defect surface except oxidant and iron scale not
The product for reacting completely, then with high pressure water washing by the 20# steel mandrel mill-rolled steel pipes of emery wheel reconditioning inner surface.Interior pit defect table
After what face covered is removed except oxidant and the product of iron scale incomplete reaction by emery wheel reconditioning, 20# steel mandrel mill-rolled steel pipes are passed through again
Second pickling is crossed to can reach completely except the purpose of removing iron scale.
Second pickling：Second pickling is carried out to 20# steel mandrel mill-rolled steel pipe, the formula of acid solution is：10 parts of measurement basis
Concentration is 33% technical hydrochloric acid, (volumetric ratio of technical hydrochloric acid and water is 10 to 20 parts of water:20, well mixed to obtain acid solution), acid
It is 70 DEG C to wash temperature, and pickling time is 25 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2Concentration is 35~75g/L；Acid
After the completion of washing, 20# steel mandrel mill-rolled steel pipes first are rinsed with water, then with high pressure water washing 20# steel mandrel mill-rolled steel pipes so that 20# steel tandem rolling steel
Acid solution on pipe is washed away, and now, 20# steel mandrel mill-rolled steel pipes have been reached completely except the purpose of removing iron scale, and its inner surface do not have
There is interior pit defect.
Embodiment 3
The treatment of interior pit defect before 12Cr1MoV mandrel mill-rolled steel pipe cold-drawns
After macro -graph, it is found that specification is dispersed with interior pockmark for the inner surface of the 12Cr1MoV mandrel mill-rolled steel pipes of Φ 219 × 16
Defect, the processing method taken before the Tube Drawing is as follows：
First time pickling：First time pickling is carried out to 12Cr1MoV mandrel mill-rolled steel pipes, the formula of acid solution is：The 15 of measurement basis
Part concentration is 33% technical hydrochloric acid, 2 parts of nitric acid, (technical hydrochloric acid, nitric acid, the volumetric ratio of water are 15 to 20 parts of water:2:20, mixing
Uniformly obtain acid solution), pickling temperature is 70 DEG C, and pickling time is 15 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2It is dense
It is 35~75g/L to spend；After the completion of pickling, 12Cr1MoV mandrel mill-rolled steel pipes first are rinsed with water, then connected with high pressure water washing 12Cr1MoV
Steel rolling tube so that the acid solution on 12Cr1MoV mandrel mill-rolled steel pipes is washed away.
Emery wheel reconditioning：12Cr1MoV mandrel mill-rolled steel pipes by first time pickling are checked, is found out and is lacked with interior pockmark
Sunken region, then carries out reconditioning with emery wheel to the region, remove in the covering of pit defect surface except oxidant and iron oxide
The product of skin incomplete reaction, then with high pressure water washing by emery wheel reconditioning 12Cr1MoV mandrel mill-rolled steel pipes.Interior pit defect table
After what face covered is removed except oxidant and the product of iron scale incomplete reaction by emery wheel reconditioning, 12Cr1MoV mandrel mill-rolled steel pipes are again
It is that can reach completely except the purpose of removing iron scale by second pickling.
Second pickling：Second pickling is carried out to 12Cr1MoV mandrel mill-rolled steel pipes, the formula of acid solution is：The 15 of measurement basis
Part concentration is 33% technical hydrochloric acid, (volumetric ratio of technical hydrochloric acid and water is 15 to 20 parts of water:20, well mixed to obtain acid solution),
Pickling temperature is 70 DEG C, and pickling time is 30 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2Concentration is 35~75g/L；
After the completion of pickling, 12Cr1MoV mandrel mill-rolled steel pipes first are rinsed with water, then with high pressure water washing 12Cr1MoV mandrel mill-rolled steel pipes so that
Acid solution on 12Cr1MoV mandrel mill-rolled steel pipes is washed away, and now, 12Cr1MoV mandrel mill-rolled steel pipes have been reached completely except removing iron scale
Purpose, and without interior pit defect.
Embodiment 4
The treatment of interior pit defect before 12Cr1MoV mandrel mill-rolled steel pipe cold-drawns
After macro -graph, it is found that specification is dispersed with interior pockmark for the inner surface of the 12Cr1MoV mandrel mill-rolled steel pipes of Φ 219 × 16
Defect, the processing method taken before the Tube Drawing is as follows：
First time pickling：First time pickling is carried out to 12Cr1MoV mandrel mill-rolled steel pipes, the formula of acid solution is：The 13 of measurement basis
Part concentration is 33% technical hydrochloric acid, 2 parts of nitric acid, (technical hydrochloric acid, nitric acid, the volumetric ratio of water are 13 to 20 parts of water:2:20, mixing
Uniformly obtain acid solution), pickling temperature is 80 DEG C, and pickling time is 10 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2It is dense
It is 35~75g/L to spend；After the completion of pickling, 12Cr1MoV mandrel mill-rolled steel pipes first are rinsed with water, then connected with high pressure water washing 12Cr1MoV
Steel rolling tube so that the acid solution on 12Cr1MoV mandrel mill-rolled steel pipes is washed away.
Emery wheel reconditioning：12Cr1MoV mandrel mill-rolled steel pipes by first time pickling are checked, is found out and is lacked with interior pockmark
Sunken region, then carries out reconditioning with emery wheel to the region, remove in the covering of pit defect surface except oxidant and iron oxide
The product of skin incomplete reaction, then with high pressure water washing by emery wheel reconditioning 12Cr1MoV mandrel mill-rolled steel pipes.Interior pit defect table
After what face covered is removed except oxidant and the product of iron scale incomplete reaction by emery wheel reconditioning, 12Cr1MoV mandrel mill-rolled steel pipes are again
It is that can reach completely except the purpose of removing iron scale by second pickling.
Second pickling：Second pickling is carried out to 12Cr1MoV mandrel mill-rolled steel pipes, the formula of acid solution is：The 13 of measurement basis
Part concentration is 33% technical hydrochloric acid, (volumetric ratio of technical hydrochloric acid and water is 13 to 20 parts of water:20, well mixed to obtain acid solution),
Pickling temperature is 80 DEG C, and pickling time is 20 minutes, and the FeCl of the acid solution is controlled in acid cleaning process2Concentration is 35~75g/L；
After the completion of pickling, 12Cr1MoV mandrel mill-rolled steel pipes first are rinsed with water, then with high pressure water washing 12Cr1MoV mandrel mill-rolled steel pipes so that
Acid solution on 12Cr1MoV mandrel mill-rolled steel pipes is washed away, and now, 12Cr1MoV mandrel mill-rolled steel pipes have been reached completely except removing iron scale
Purpose, and without interior pit defect.
In above-described embodiment, the FeCl of acid solution2Concentration is controlled in the range of 35~75g/L, and each embodiment can lead to
Replacing acid solution or addition hydrochloric acid is crossed to reach control FeCl2The purpose of concentration.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementation methods, and these modifications and implementation method will fall in this Shen
Please be within disclosed spirit and spirit.More specifically, in the range of disclosure and claim, can be to master
The building block and/or layout for inscribing composite configuration carry out various variations and modifications.Except what is carried out to building block and/or layout
Outside variations and modifications, to those skilled in the art, other purposes also will be apparent.
Claims (6)
1. in a kind of tandem rolling carbon steel or low alloy steel steel pipe pit defect processing method, it is characterised in that it include following step
Suddenly：
A, first time pickling
10~15 parts of concentration of measurement basis first are that 33% technical hydrochloric acid, 1~3 part of nitric acid and 20 parts of water uniformly mixes
Prepare acid solution, then carry out first time pickling to tandem rolling carbon steel or low alloy steel steel pipe, pickling temperature is 60~80 DEG C, pickling when
Between be 10~25 minutes, the FeCl of the acid solution is controlled in acid cleaning process2Concentration is 35~75g/L；The company of washing away after the completion of pickling
Roll the acid solution on carbon steel or low alloy steel steel pipe；
B, emery wheel reconditioning
Tandem rolling carbon steel or low alloy steel steel pipe by first time pickling is checked, the tandem rolling with interior pit defect is found out
Carbon steel or low alloy steel steel pipe simultaneously carries out reconditioning with emery wheel to its interior pockmark region, removes the thing of interior pockmark region surface covering
Matter, then with high pressure water washing by the tandem rolling carbon steel or low alloy steel steel pipe of emery wheel reconditioning inner surface；
C, second pickling
Then 10~15 parts of concentration of measurement basis are that 33% technical hydrochloric acid and 20 parts of water are uniformly mixed with acid solution, then
Second pickling is carried out to the tandem rolling carbon steel or low alloy steel steel pipe obtained by step B, pickling temperature is 60~80 DEG C, pickling time
It is 20~50 minutes, the FeCl of the acid solution is controlled in acid cleaning process2Concentration is 35~75g/L；Tandem rolling is washed away after the completion of pickling
Acid solution on carbon steel or low alloy steel steel pipe obtains the tandem rolling carbon steel or low alloy steel steel pipe without interior pit defect.
2. in tandem rolling carbon steel or low alloy steel steel pipe according to claim 1 pit defect processing method, its feature exists
In the temperature of the first time pickling and second pickling be 70 DEG C.
3. in tandem rolling carbon steel or low alloy steel steel pipe according to claim 1 pit defect processing method, its feature exists
In the pickling time of the first time pickling be 15~20 minutes.
4. in tandem rolling carbon steel or low alloy steel steel pipe according to claim 1 pit defect processing method, its feature exists
In the pickling time of second pickling be 25~30 minutes.
5. in tandem rolling carbon steel or low alloy steel steel pipe according to claim 1 pit defect processing method, its feature exists
It is first to be rinsed with water in the method for washing away the acid solution on tandem rolling carbon steel or low alloy steel steel pipe described in step A and step C, then with height
Blow wash.
6. in tandem rolling carbon steel or low alloy steel steel pipe according to claim 1 pit defect processing method, its feature exists
The material covered in interior pockmark region surface described in step B is except the oxidation on oxidant and tandem rolling carbon steel or low alloy steel steel pipe
The product of iron sheet incomplete reaction.
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| CN201410728059.2A CN104404561B (en) | 2014-12-03 | 2014-12-03 | Method for treating inner pit defect inside continuous rolling carbon steel tube or low-alloy steel tube |
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| CN111485242A (en) * | 2020-06-15 | 2020-08-04 | 建龙北满特殊钢有限责任公司 | Low-carbon steel surface treatment method |
| CN112847061A (en) * | 2020-12-31 | 2021-05-28 | 浦项(张家港)不锈钢股份有限公司 | Method for removing cracks on surface of super austenitic stainless steel strip steel and product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534152A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN103831303A (en) * | 2014-02-21 | 2014-06-04 | 内蒙古包钢钢联股份有限公司 | Method for reducing pits in surface of wide and thick plate |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534152A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN103831303A (en) * | 2014-02-21 | 2014-06-04 | 内蒙古包钢钢联股份有限公司 | Method for reducing pits in surface of wide and thick plate |
Non-Patent Citations (1)
| Title |
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| "中轧车间大规格圆钢表面麻坑产生原因分析";韩兴军 等;《山东冶金》;19991031;第21卷(第5期);第45-46页 * |
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