CN105714082A - Bright annealing process for seamless steel tube - Google Patents
Bright annealing process for seamless steel tube Download PDFInfo
- Publication number
- CN105714082A CN105714082A CN201610116655.4A CN201610116655A CN105714082A CN 105714082 A CN105714082 A CN 105714082A CN 201610116655 A CN201610116655 A CN 201610116655A CN 105714082 A CN105714082 A CN 105714082A
- Authority
- CN
- China
- Prior art keywords
- seamless steel
- steel pipe
- cylindrical body
- sleeve pipe
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
Abstract
The invention discloses a bright annealing process for a seamless steel tube. The bright annealing process comprises the following steps of a) manufacturing a sleeve; b) combining the sleeve; c) discharging air; d) sealing an open end; e) carrying out annealing treatment, f) carrying out cooling treatment; and g) checking to prepare a finished product. Compared with the prior art, the bright annealing process has the advantages that the sleeve sleeves the outside of the seamless steel tube to be treated, air in the sleeve and the seamless steel tube is discharged by pressing by virtue of protective gases, only the seamless steel pipe to be subjected to thermal treatment and protective argon exist in the sleeve and external gases cannot enter the sleeve when the sleeve enters a continuous annealing furnace and is subjected to thermal treatment, so that the seamless steel tube is in an oxygen-free environment in the thermal treatment process, the condition that the protective gases are charged into a thermal treatment furnace in the thermal treatment process is avoided, the manufacturing and using costs of the thermal treatment furnace are reduced, the steel tube treated in such a way is favorable in inner and outer surfaces and relatively low in roughness, and the processing efficiency is increased.
Description
[technical field]
The present invention relates to process for heat treatment of steel pipe technical field, particularly the busbar bright annealing technology of a kind of seamless steel pipe.
[background technology]
Seamless steel pipe is heat treatment under oxidation hot conditions, ferrum and various metallic alloying element in steel will with oxygen generation oxidation reactions, generate ferrum oxide, ferrous oxide and other metal-oxide, steel pipe surfaces externally and internally is made to affect roughness because of oxidation, further need exist for pickling processes or other method removes oxide, cause the surfaces externally and internally roughness of environmental pollution and product to be unable to reach customer requirement.
In order to ensure roughness requirements, general steel pipe carries out heat treatment in vacuum or controlled atmosphere furnace, such as the Chinese invention patent application file that number of patent application is 201410011836.1, it discloses steel pipe the first heating region sequentially passing through in heat-treatment furnace, second heating region, 3rd heating region, 4th heating region and heat preservation zone, close in heat treatment process and be filled with protective gas in heat-treatment furnace, but vacuum or controlled atmosphere furnace manufacturing cost and use cost are all high, the technique of pipe of this particular/special requirement is had and economically all inapplicable for small lot, send outer committee processing date of delivery and processing cost also impacted.
[summary of the invention]
The purpose of the present invention solves the problems of the prior art exactly, it is proposed to the busbar bright annealing technology of a kind of seamless steel pipe, it is possible to reach the annealing of non-oxidation, makes steel pipe surfaces externally and internally smooth, improves product quality, reduces processing cost.
For achieving the above object, the present invention proposes the busbar bright annealing technology of a kind of seamless steel pipe, comprises the steps:
A) sleeve pipe makes: adopting a sleeve pipe with hollow cavity, the one end open at sleeve pipe seals so that it is become the cylindrical body sleeve pipe with blind end and opening；
B) sleeve combination: by pending seamless steel pipe in described opening is sieved into the hollow cavity of the cylindrical body sleeve pipe described in step a), seamless steel pipe is included in interior combination and forms pipe box group by described cylindrical body sleeve pipe；
C) air is discharged: pass into protective gas in one end of seamless steel pipe, until the air that described protective gas is oppressed in the pipe box group of described step b) in cylindrical body sleeve pipe and seamless steel pipe is discharged from the opening of described cylindrical body sleeve pipe；
D) closing open end: after the opening emptying of described cylindrical body sleeve pipe, the opening of cylindrical body sleeve pipe is sealed until the air in cylindrical body sleeve pipe and seamless steel pipe, the closed casing that seamless steel pipe is accommodated in the inner by composition one；
E) annealing: by the closed casing described in step d) as carrying out heat treatment in annealing furnace；
F) cooling processes: the closed casing after being completed by heat treatment takes out from annealing furnace and cools down；
G) inspection prepares finished product: by closed casing one tip cut-off after cooling, and then will be placed in hollow cavity seamless steel pipe and take out, the prepared finished product through carrying out aligning, after Pipe Cutting and inspection.
As preferably, described step a) middle sleeve one end open adopts steel plate sealing to reach to seal so that it is become the cylindrical body sleeve pipe with blind end and opening.
As preferably, in described step b), the caliber of cylindrical body sleeve pipe is more than the caliber of pending seamless steel pipe, and the length of cylindrical body sleeve pipe is more than the length of pending seamless steel pipe.
As preferably, in described step c), protective gas reaches the blind end of cylindrical body sleeve pipe by the inside of seamless steel pipe, and the air that protective gas is oppressed in cylindrical body sleeve pipe and seamless steel pipe after blind end is discharged from the opening of described cylindrical body sleeve pipe.
As preferably, in described step d), the opening of cylindrical body sleeve pipe adopts steel plate sealing to reach to seal, the closed casing that seamless steel pipe is accommodated in the inner by composition one.
As preferably, in described step e), heat treatment is stagewise heat treatment, and in annealing furnace, heating-up temperature is progressively incremented by.
As preferably, in described step f), cooling adopts water-cooled to process.
As preferably, described protective gas is argon.
Beneficial effects of the present invention: compared with prior art, the present invention adopts sleeve pipe to be nested with outside pending seamless steel pipe, the air that protective gas compressing is closed in sleeve pipe and seamless steel pipe is utilized to discharge, when sleeve pipe entrance continuous annealing furnace carries out heat treatment, seamless steel pipe only to be heated in sleeve pipe and protection argon, extraneous gas cannot be introduced into, seamless steel pipe is made to reach oxygen-free environment in heat treatment process, avoid being filled with in heat-treatment furnace protective gas in heat treatment process, reduce heat-treatment furnace manufacturing cost and use cost, through the steel pipe of this process, there is good surfaces externally and internally, roughness is relatively low, and improve working (machining) efficiency.
Inventive feature and advantage will be described in detail by embodiment.
[detailed description of the invention]
The present invention comprises the steps:
A) sleeve pipe makes: adopt a sleeve pipe with hollow cavity, and the one end open at sleeve pipe adopts steel plate sealing to reach to seal so that it is become the cylindrical body sleeve pipe with blind end and opening；
B) sleeve combination: by pending seamless steel pipe in described opening is sieved into the hollow cavity of the cylindrical body sleeve pipe described in step a), wherein the caliber of cylindrical body sleeve pipe is more than the caliber of pending seamless steel pipe, the length of cylindrical body sleeve pipe is more than the length of pending seamless steel pipe, and seamless steel pipe is included in interior combination and forms pipe box group by described cylindrical body sleeve pipe；
C) air is discharged: pass into protective gas in one end of seamless steel pipe; this protective gas is argon; until the air that described protective gas is oppressed in the pipe box group of described step b) in cylindrical body sleeve pipe and seamless steel pipe is discharged from the opening of described cylindrical body sleeve pipe; in this process, protective gas reaches the blind end of cylindrical body sleeve pipe by the inside of seamless steel pipe, and protective gas is oppressed the air in cylindrical body sleeve pipe and seamless steel pipe after blind end and discharged；
D) closing open end: adopt steel plate sealing to reach to seal the opening of cylindrical body sleeve pipe until the air in cylindrical body sleeve pipe and seamless steel pipe after the opening emptying of described cylindrical body sleeve pipe, the closed casing that seamless steel pipe is accommodated in the inner by composition one；
E) annealing: by the closed casing described in step d) as carrying out heat treatment in annealing furnace, heat treatment is stagewise heat treatment, and in annealing furnace, heating-up temperature is progressively incremented by；
F) cooling processes: the closed casing after being completed by heat treatment takes out from annealing furnace and cools down, owing to being the cylinder body closed, heat treatment heating process cannot produce convection current, heating the conduction of heat after only being heated by sleeve and heat radiation completes, heat treatment time is a little longer, after heated soaking, sleeve is come out of the stove, if steel pipe stainless steel tube to be heated, the precipitation for reducing chromium carbide produces intercrystalline corrosion, and sleeve must be hoisted in water vat quick cooling by water；If steel pipe to be heated is carbon steel tubing or low alloy steel can be come out of the stove natural cooling；
G) inspection prepares finished product: by closed casing one tip cut-off after cooling, and then will be placed in hollow cavity seamless steel pipe and take out, the prepared finished product through carrying out aligning, after Pipe Cutting and inspection.
Above-described embodiment is the description of the invention, is not limitation of the invention, any scheme after simple transformation of the present invention is belonged to protection scope of the present invention.
Claims (8)
1. a busbar bright annealing technology for seamless steel pipe, comprises the steps:
A) sleeve pipe makes: adopting a sleeve pipe with hollow cavity, the one end open at sleeve pipe seals so that it is become the cylindrical body sleeve pipe with blind end and opening；
B) sleeve combination: by pending seamless steel pipe in described opening is sieved into the hollow cavity of the cylindrical body sleeve pipe described in step a), seamless steel pipe is included in interior combination and forms pipe box group by described cylindrical body sleeve pipe；
C) air is discharged: pass into protective gas in one end of seamless steel pipe, until the air that described protective gas is oppressed in the pipe box group of described step b) in cylindrical body sleeve pipe and seamless steel pipe is discharged from the opening of described cylindrical body sleeve pipe；
D) closing open end: after the opening emptying of described cylindrical body sleeve pipe, the opening of cylindrical body sleeve pipe is sealed until the air in cylindrical body sleeve pipe and seamless steel pipe, the closed casing that seamless steel pipe is accommodated in the inner by composition one；
E) annealing: by the closed casing described in step d) as carrying out heat treatment in annealing furnace；
F) cooling processes: the closed casing after being completed by heat treatment takes out from annealing furnace and cools down；
G) inspection prepares finished product: by closed casing one tip cut-off after cooling, and then will be placed in hollow cavity seamless steel pipe and take out, the prepared finished product through carrying out aligning, after Pipe Cutting and inspection.
2. the busbar bright annealing technology of a kind of seamless steel pipe according to claim 1, it is characterised in that: described step a) middle sleeve one end open adopts steel plate sealing to reach to seal so that it is become the cylindrical body sleeve pipe with blind end and opening.
3. the busbar bright annealing technology of a kind of seamless steel pipe according to claim 2, it is characterized in that: in described step b), the caliber of cylindrical body sleeve pipe is more than the caliber of pending seamless steel pipe, and the length of cylindrical body sleeve pipe is more than the length of pending seamless steel pipe.
4. the busbar bright annealing technology of a kind of seamless steel pipe according to claim 3; it is characterized in that: in described step c), protective gas reaches the blind end of cylindrical body sleeve pipe by the inside of seamless steel pipe, the air that protective gas is oppressed in cylindrical body sleeve pipe and seamless steel pipe after blind end is discharged from the opening of described cylindrical body sleeve pipe.
5. the busbar bright annealing technology of a kind of seamless steel pipe according to claim 1,2,3 or 4, it is characterised in that: in described step d), the opening of cylindrical body sleeve pipe adopts steel plate sealing to reach to seal, the closed casing that seamless steel pipe is accommodated in the inner by composition one.
6. the busbar bright annealing technology of a kind of seamless steel pipe according to claim 5, it is characterised in that: in described step e), heat treatment is stagewise heat treatment, and in annealing furnace, heating-up temperature is progressively incremented by.
7. the busbar bright annealing technology of a kind of seamless steel pipe according to claim 6, it is characterised in that: in described step f), cooling adopts water-cooled to process.
8. the busbar bright annealing technology of a kind of seamless steel pipe according to claim 1, it is characterised in that: described protective gas is argon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610116655.4A CN105714082A (en) | 2016-03-02 | 2016-03-02 | Bright annealing process for seamless steel tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610116655.4A CN105714082A (en) | 2016-03-02 | 2016-03-02 | Bright annealing process for seamless steel tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105714082A true CN105714082A (en) | 2016-06-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610116655.4A Pending CN105714082A (en) | 2016-03-02 | 2016-03-02 | Bright annealing process for seamless steel tube |
Country Status (1)
| Country | Link |
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| CN (1) | CN105714082A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109266818A (en) * | 2018-11-14 | 2019-01-25 | 浙江中达特钢股份有限公司 | A kind of seamless pipe bright annealing device |
| CN109897951A (en) * | 2019-04-24 | 2019-06-18 | 浙江海亮股份有限公司 | Expect frame and copper tube vacuum annealing furnace |
| CN110760663A (en) * | 2019-10-11 | 2020-02-07 | 江苏科技大学 | Anti-oxidation high-temperature heat treatment method for metal pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1224065A (en) * | 1998-01-22 | 1999-07-28 | 上海奉贤钢管厂 | Process for treatment of precision bright seamless steel tube |
| CN101768707A (en) * | 2008-12-30 | 2010-07-07 | 新疆众和股份有限公司 | Anti-oxidation method of metal foil |
| CN102230061A (en) * | 2011-07-14 | 2011-11-02 | 内蒙古包钢钢联股份有限公司 | Anti-oxidation heat treatment method of thin plate sample with thickness of less than 1 mm |
-
2016
- 2016-03-02 CN CN201610116655.4A patent/CN105714082A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1224065A (en) * | 1998-01-22 | 1999-07-28 | 上海奉贤钢管厂 | Process for treatment of precision bright seamless steel tube |
| CN101768707A (en) * | 2008-12-30 | 2010-07-07 | 新疆众和股份有限公司 | Anti-oxidation method of metal foil |
| CN102230061A (en) * | 2011-07-14 | 2011-11-02 | 内蒙古包钢钢联股份有限公司 | Anti-oxidation heat treatment method of thin plate sample with thickness of less than 1 mm |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109266818A (en) * | 2018-11-14 | 2019-01-25 | 浙江中达特钢股份有限公司 | A kind of seamless pipe bright annealing device |
| CN109897951A (en) * | 2019-04-24 | 2019-06-18 | 浙江海亮股份有限公司 | Expect frame and copper tube vacuum annealing furnace |
| CN110760663A (en) * | 2019-10-11 | 2020-02-07 | 江苏科技大学 | Anti-oxidation high-temperature heat treatment method for metal pipe |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20160629 |