CN100513648C - Borax preblowing technological process - Google Patents
Borax preblowing technological process Download PDFInfo
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- CN100513648C CN100513648C CNB2007100575085A CN200710057508A CN100513648C CN 100513648 C CN100513648 C CN 100513648C CN B2007100575085 A CNB2007100575085 A CN B2007100575085A CN 200710057508 A CN200710057508 A CN 200710057508A CN 100513648 C CN100513648 C CN 100513648C
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- borax
- hollow billet
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- pipe
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Abstract
The technological process of pre-blowing borax includes the following steps; 1. blowing inside the roughened pipe with gas in 2.0-6.0 bar pressure without borax to form forward gas flow in 2 sec before blowing borax; and 2. blowing borax into the roughened pipe with gas in 0.5-2.0 bar from one end to the other while rotating the pipe for fill the inner wall of the pipe with borax. The said process can ensure the spread of borax stably in the inner wall of the roughened pipe so as to react completely with iron scale for elimination. The present invention has best utilization of borax and good borax blowing effect.
Description
Technical field
The present invention relates to the borax preblowing technological process in a kind of steel pipe's production.
Background technology
In seamless steel tube production, need carry out anti-oxidation processing to the hollow billet after the perforation, promptly blow the technology of borax to the hollow billet internal surface.Iron scale reaction by borax and steel pipe internal-surface reaches the purpose of removing iron scale.Initial blowing method is that a certain amount of borax is purged with a kind of pressure, but since the perforation after the hollow billet temperature inside up to more than 1100 ℃, the internal high temperature air-flow has stoped the purging of borax, most of borax is gone to the outside of hollow billet.Therefore, can only strengthen the pressure that purges borax.But the consequence of intensified pressure is, hollow billet purging effect end to end is inconsistent, and head pressure is big, and afterbody pressure is little, is easy to cause steel pipe internal-surface to scab.To this mass defect, the pipe that situation is light needs reconditioning or excision, and the pipe that situation is serious just causes waste product.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this invention is to provide a kind of borax preblowing technological process, guarantee that borax blows to the hollow billet internal surface with a kind of pressure stable in purge, thereby do not produce the surface lap defective, improved pipe quality and production efficiency.
For achieving the above object, the technical solution used in the present invention provides a kind of borax preblowing technological process, and this method may further comprise the steps:
1. sky blows
In blowing preceding 2 seconds of borax, be that gas sky in hollow billet of 2.0-6.0bar blows with pressure, do not add borax this moment, makes that hollow billet is inner will to form forward air-flow along the empty direction of blowing;
2. blow borax
Be that 0.5-2.0bar blows borax again with pressure in hollow billet, make borax blow to the other end from hollow billet one end, along with the rotation of hollow billet, borax is full of whole hollow billet inwall equably.
Effect of the present invention is that this technology breaks through the high temperature gas flow more than 1100 ℃ in the hollow billet, has guaranteed that borax blows to the hollow billet internal surface with pressure stable.And along with the rotation of hollow billet, borax arrives whole hollow billet inwall equably, has really reached the complete reaction of borax and iron scale, thereby has removed iron scale.
According to this technology hollow billet is carried out anti-oxidation purging, not only solved most of borax, also solved the hollow billet inconsistent difficult problem of purging effect end to end by the wasting phenomenon of hollow billet hot gas flow retaining (blowback) in the hollow billet outside.Thereby, reduced the defective that steel pipe internal-surface scabs effectively.Improved the quality of steel pipe internal-surface.Alleviated pressure for the production of back operation.Also reduced the expense of scab defects in the reconditioning.
Embodiment
Use is described in detail to borax preblowing technology of the present invention in conjunction with the embodiments.
Borax preblowing technological process of the present invention, this method may further comprise the steps:
1. sky blows
In blowing preceding 2 seconds of borax, be that gas sky in hollow billet of 2.0-6.0bar blows with pressure, do not add borax this moment, makes that hollow billet is inner will to form forward air-flow along the empty direction of blowing;
2. blow borax
Be that 0.5-2.0bar blows borax again with pressure in hollow billet, make borax blow to the other end from hollow billet one end, along with the rotation of hollow billet, borax is full of whole hollow billet inwall equably.
To produce 177.8 * 8.05 telescopic production processes is example, and the capillary outer diameter that tapping machine passes is 294mm, and wall thickness is 25mm, and hollow billet length is 6m, between 1200 ℃～1215 ℃ of the hollow billet temperature.At this moment, setting processing condition is:
The borax amount is 1100g
Empty blow pressure power 2.2bar
Blast pressure is 1.2bar
The normal fluctuation range of pressure is 0.1bar
Carry out borax with the parameter of above-mentioned setting and purge, the phenomenon of seeing through observation is a sufficient combustion, purges effectively, has only borax seldom to return the hollow billet outside.
Then, the production tube protonatomic mass is followed the tracks of.Each stove (more than 200) has only the defective that appearance slightly scabs in 2～3, and online just reconditioning in time processing, has guaranteed hollow billet is carried out the quality of anti-oxidation processing.
Claims (1)
1, a kind of borax preblowing technological process, this method may further comprise the steps:
1. sky blows
In blowing preceding 2 seconds of borax, be that gas sky in hollow billet of 2.0-6.0bar blows with pressure, do not add borax this moment, makes that hollow billet is inner will to form forward air-flow along the empty direction of blowing;
2. blow borax
Be that 0.5-2.0bar blows borax again with pressure in hollow billet, make borax blow to the other end from hollow billet one end, along with the rotation of hollow billet, borax is full of whole hollow billet inwall equably.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100575085A CN100513648C (en) | 2007-05-31 | 2007-05-31 | Borax preblowing technological process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100575085A CN100513648C (en) | 2007-05-31 | 2007-05-31 | Borax preblowing technological process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101067208A CN101067208A (en) | 2007-11-07 |
| CN100513648C true CN100513648C (en) | 2009-07-15 |
Family
ID=38879897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100575085A Active CN100513648C (en) | 2007-05-31 | 2007-05-31 | Borax preblowing technological process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100513648C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703918B (en) * | 2012-07-05 | 2013-12-11 | 包头市和润冶金润滑材料有限公司 | Borax oxide remover for internal surface of hot continuous rolled steel pipe and method for preparing same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135336A (en) * | 1983-02-24 | 1984-08-30 | Dalmine Spa | Hot deoxidation of semifinished metal tubes |
| CN1968766A (en) * | 2004-06-18 | 2007-05-23 | 住友金属工业株式会社 | Process for producing seamless steel pipe |
-
2007
- 2007-05-31 CN CNB2007100575085A patent/CN100513648C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135336A (en) * | 1983-02-24 | 1984-08-30 | Dalmine Spa | Hot deoxidation of semifinished metal tubes |
| CN1968766A (en) * | 2004-06-18 | 2007-05-23 | 住友金属工业株式会社 | Process for producing seamless steel pipe |
Non-Patent Citations (2)
| Title |
|---|
| 除氧化物剂影响钢管内结疤的试验研究. 曾朝晖.新技术新工艺，第11期. 2001 |
| 除氧化物剂影响钢管内结疤的试验研究. 曾朝晖.新技术新工艺，第11期. 2001 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101067208A (en) | 2007-11-07 |
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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: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Steel Pipe Group Co., Ltd. |