CN101745555B - Dephosphorization method of inner surface of steel tube blank - Google Patents
Dephosphorization method of inner surface of steel tube blank Download PDFInfo
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- CN101745555B CN101745555B CN200910229078XA CN200910229078A CN101745555B CN 101745555 B CN101745555 B CN 101745555B CN 200910229078X A CN200910229078X A CN 200910229078XA CN 200910229078 A CN200910229078 A CN 200910229078A CN 101745555 B CN101745555 B CN 101745555B
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Abstract
The invention provides a dephosphorization method of an inner surface of a steel tube blank, comprising the following steps: conveying a blank tube heated by a heating furnace to the roller of a rotary expanding machine through a heating furnace roller way and a foreground roller way of the rotary expanding machine; after being bitten by the roller of the rotary expanding machine, leading the blank tube to enter a sealed hole pattern composed of a roller, a top and a guide plate so as to ensure that the steel tube blank advances while rotating, and then rolling; preparing brine of which the density is 10-11%; pumping the brine into a brine pipeline by a brine pump, and sending the brine to a jet head on the front end of a mandril through the brine tube in the mandril; when the rotary expanding machine roller bites the blank tube, ejecting the brine to the inner surface of the blank tube; blasting a scale into powder and blowing out; and rolling the blank tube to meet the technical requirements. The method has the beneficial effect that the inner surface of the blank tube is dephosphorized so as to reduce the ratio of pockmark defects on the inner surface of the blank tube, thus greatly improving the quality of the inner surface of the steel tube, and reducing inside grinding and secondary transportation cost, namely grinding cost is 500 yuan/ton, thus saving by 440,000 yuan per month and 5280,000 yuan per year by calculating based on 4,000 tons/month.
Description
Technical field
The present invention relates to a kind of steel pipe's production Quality Control Technology, particularly a kind of dephosphorization method of inner surface of steel tube blank.
Background technology
720 units are since 2008 6 selenothermy is tried, gone into operation, and the steel pipe internal-surface pockmark is one of significant deficiency of tube quality always.Cause the reason of inner surface pockmark: the one, in the base pipe heating process, inner surface produces more iron scale, and the 2nd, at the follow-up expansion unit that revolves, the iron scale of inner surface is after revolving the top roll off that expands milling train, compress into tube wall, form pockmark, have a strong impact on the inner surface quality of steel pipe.
Summary of the invention
At the deficiency on the prior art, the purpose of this invention is to provide a kind of dephosphorization method of inner surface of steel tube blank, to get rid of the iron scale of base pipe internal surface, alleviate pockmark defective until thorough elimination inner surface.
For achieving the above object, the technical solution used in the present invention provides a kind of dephosphorization method of inner surface of steel tube blank, this method comprises a cover compression air system, a cover salt bath system, the supporting shower nozzle of push rod front end, behind the salt solution intensified pressure that compressed air system is used for the salt bath system is sent here, shower nozzle ejection through the push rod front end, high pressure brine is with after the iron scale of base pipe internal surface after the heating contacts, the quick-fried effect of salt takes place, iron scale is smashed, blow out through high pressure brine, this method may further comprise the steps:
(1) the base pipe after heating furnace heating through the heating furnace furnace delivery table, revolve expansion machine foreground roller-way, be transported to and revolve expansion machine roll place, after being revolved expansion machine roll and nipping, enter in the closed type of forming by roll, top and guide plate, steel tube blank is advanced while rotating, be rolled;
(2), be 10～11% salt solution with compound concentration, squeeze into saline line through brine pump, through Brine Pipe in the push rod, deliver to the shower nozzle place of push rod front end;
(3), when revolving expansion machine roll and nip the base pipe, the shower nozzle of push rod front end ejects compressed air pressurized to the salt solution of 39bar to the base pipe internal surface, and the salt ion in the salt solution runs into the iron scale of high temperature, produce the quick-fried effect of salt, the iron scale explosion is become the broken end of diameter 1～2cm;
(4), high pressure brine blows out the broken end of iron scale;
(5), the base pipe is through rolling, wall thickness reduction becomes hollow billet, the hollow billet wall thickness range should meet ± 10% specification requirement, after rolling end, salt solution stops to spray.
Effect of the present invention is to use this method to the dephosphorization of base pipe internal surface, reduced the ratio of inner surface of steel tube blank pockmark defective significantly, by original about 25%, drop to now about 3%, the steel pipe internal-surface quality is greatly improved, significantly reduced interior reconditioning and had bad luck cost, by 4000 tons of calculating of monthly output, 500 yuan of ton reconditioning expenses can be saved 440,000 yuan of reconditioning expenses in every month, can save 5,280,000 yuan of reconditioning expenses every year.
Description of drawings
Fig. 1 is a steel pipe internal-surface dephosphorization equipment structural representation of the present invention.
Among the figure:
1, revolve the base pipe 3, the shower nozzle 4 that expand after roll 2, the heating, revolve and expand the top
5, hollow billet 6, push rod 7, the interior Brine Pipe of push rod after the hole enlargement
8, compressed air system 9, salt bath system
The specific embodiment
Below in conjunction with accompanying drawing, dephosphorization method of inner surface of steel tube blank process of the present invention is illustrated.
As shown in Figure 1, arrow is a base pipe direct of travel among the figure.
Dephosphorization method of inner surface of steel tube blank of the present invention, this method comprises a cover compression air system, a cover salt bath system, the supporting shower nozzle of push rod front end, behind the salt solution intensified pressure that compressed air system is used for the salt bath system is sent here, shower nozzle ejection through the push rod front end, high pressure brine is with after the iron scale of base pipe internal surface after the heating contact, and iron scale is smashed in the quick-fried effect of generation salt, blow out through high pressure brine, this method specifically may further comprise the steps:
(1) the base pipe after heating furnace heating through the heating furnace furnace delivery table, revolve expansion machine foreground roller-way, be transported to and revolve expansion machine roll place, after being revolved expansion machine roll and nipping, enter in the closed type of forming by roll, top and guide plate, steel tube blank is advanced while rotating, be rolled;
(2), be 10～11% salt solution with compound concentration, squeeze into saline line through brine pump, through Brine Pipe in the push rod, deliver to the shower nozzle place of push rod front end;
(3), when revolving expansion machine roll and nip the base pipe, the shower nozzle of push rod front end ejects compressed air pressurized to the salt solution of 39bar to the base pipe internal surface, and the salt ion in the salt solution runs into the iron scale of high temperature, produce the quick-fried effect of salt, the iron scale explosion is become the broken end of diameter 1～2cm;
(4), high pressure brine blows out the broken end of iron scale;
(5), the base pipe is through rolling, wall thickness reduction becomes hollow billet, the hollow billet wall thickness range should meet ± 10% specification requirement, after rolling end, salt solution stops to spray.
Base pipe internal surface phosphorus removing method of the present invention is achieved in that
Dephosphorization method of inner surface of steel tube blank of the present invention, this method comprises a cover compression air system, a cover salt bath system, the supporting shower nozzle of push rod front end, behind the salt solution intensified pressure that compressed air system is used for the salt bath system is sent here, shower nozzle ejection through the push rod front end, high pressure brine is with after the iron scale of base pipe internal surface after the heating contact, and iron scale is smashed in the quick-fried effect of generation salt, blow out through high pressure brine, this method comprises following components:
1, compressed air system: comprise air compressor machine, pipeline, valve and control system etc., providing pressure for salt bath is 38～40bar, utilizes high pressure brine to get rid of the iron scale of inner surface.
2,, the base pipe 2 after heating furnace heating through the heating furnace furnace delivery table, revolve expansion machine foreground roller-way, be transported to and revolve expansion machine roll 1 place, after being nipped by roll, enter by roll, revolve and expand in the closed type that top 4 and guide plate form, rotation Yi Bian advance, realizes rolling on one side.
3,, salt bath system: comprise salt bath pump, brine tank, pipeline, valve and control system,, utilize the quick-fried effect of salt that the explosion of base pipe internal surface iron scale is become broken end, be beneficial to iron scale is blown out for dephosphorization provides salt solution.In salt bath system 9, preparation salt solution, it is 10～11% solution that common Yan Heshui is made into concentration, the quick-fried effect of the salt of this concentration is best.Prepare concentration and be 10～11% salt solution and squeeze into pipeline, deliver to shower nozzle 3 places through Brine Pipes 7 in the push rod 6 through brine pump.
4, from nipping that time, shower nozzle ejects the salt solution of pressurized with compressed air in the compressed air system 8 to the base pipe internal surface, and the salt ion in the salt solution runs into the iron scale of high temperature, produces the quick-fried effect of salt, and the iron scale explosion is become broken end.
5, high pressure brine blows out the broken end of iron scale.
6, steel tube blank is through rolling, and external diameter enlarges, and wall thickness reduction becomes hollow billet 5 after the hole enlargement, and the wall thickness range of hollow billet 5 should meet ± 10% specification requirement, after rolling end, salt solution stops to spray.
Claims (1)
1. dephosphorization method of inner surface of steel tube blank, this method comprises a cover compression air system, a cover salt bath system, the supporting shower nozzle of push rod front end, behind the salt solution intensified pressure that compressed air system is used for the salt bath system is sent here, shower nozzle ejection through the push rod front end, high pressure brine is with after the iron scale of base pipe internal surface after the heating contact, and iron scale is smashed in the quick-fried effect of generation salt, blow out through high pressure brine, this method may further comprise the steps:
(1) the base pipe after heating furnace heating through the heating furnace furnace delivery table, revolve expansion machine foreground roller-way, be transported to and revolve expansion machine roll place, after being revolved expansion machine roll and nipping, enter in the closed type of forming by roll, top and guide plate, steel tube blank is advanced while rotating, be rolled;
(2), be 10～11% salt solution with compound concentration, squeeze into saline line through brine pump, through Brine Pipe in the push rod, deliver to the shower nozzle place of push rod front end;
(3), when revolving expansion machine roll and nip the base pipe, the shower nozzle of push rod front end ejects compressed air pressurized to the salt solution of 39bar to the base pipe internal surface, and the salt ion in the salt solution runs into the iron scale of high temperature, produce the quick-fried effect of salt, the iron scale explosion is become the broken end of diameter 1～2cm;
(4), high pressure brine blows out the broken end of iron scale;
(5), the base pipe is through rolling, wall thickness reduction becomes hollow billet, the hollow billet wall thickness range should meet ± 10% specification requirement, after rolling end, salt solution stops to spray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200910229078XA CN101745555B (en) | 2009-12-10 | 2009-12-10 | Dephosphorization method of inner surface of steel tube blank |
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| CN200910229078XA CN101745555B (en) | 2009-12-10 | 2009-12-10 | Dephosphorization method of inner surface of steel tube blank |
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| CN101745555A CN101745555A (en) | 2010-06-23 |
| CN101745555B true CN101745555B (en) | 2011-09-28 |
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| CN102319734B (en) * | 2011-06-08 | 2013-08-14 | 秦皇岛首秦金属材料有限公司 | Method for effectively controlling small pockmark defects on surface of medium plate |
| DE102012019025A1 (en) * | 2012-09-26 | 2014-03-27 | Sms Meer Gmbh | Deoxidation of obliquely rolled hollow blocks |
| CN112718868A (en) * | 2020-12-10 | 2021-04-30 | 太原重工股份有限公司 | System and process for eliminating pockmarks on inner surface of hot rotary expansion steel pipe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086062A (en) * | 2007-07-09 | 2007-12-12 | 陈历泽 | Strong acid metal surface phosphor passivation and anti-rust agent and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086062A (en) * | 2007-07-09 | 2007-12-12 | 陈历泽 | Strong acid metal surface phosphor passivation and anti-rust agent and its production method |
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Effective date of registration: 20190626 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
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