CN114686669A - Online heat treatment method for low-temperature pipe and high-steel-grade pipeline pipe - Google Patents
Online heat treatment method for low-temperature pipe and high-steel-grade pipeline pipe Download PDFInfo
- Publication number
- CN114686669A CN114686669A CN202011644725.6A CN202011644725A CN114686669A CN 114686669 A CN114686669 A CN 114686669A CN 202011644725 A CN202011644725 A CN 202011644725A CN 114686669 A CN114686669 A CN 114686669A
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- Prior art keywords
- pipe
- steel
- heat treatment
- low
- treatment method
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Classifications
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- 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
- C21D9/085—Cooling or quenching
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/82—Descaling by thermal stresses
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to an on-line heat treatment method for low-temperature pipes and high-steel grade pipeline pipes. The hot-rolled pierced billet is heated to 950-1000 ℃ again, oxide skin on the outer surface of the pierced billet is removed through high-pressure water, and the pierced billet is rapidly cooled after sizing. The invention can economically produce high-quality cryogenic tubes and high-steel grade X60-X80 pipeline tubes by carrying out on-line heat treatment on pierced billets, and greatly improves the market competitiveness of large-caliber cryogenic tubes and pipeline tubes.
Description
Technical Field
The invention relates to the technical field of heat treatment of large-diameter seamless steel pipes, in particular to an on-line heat treatment method for low-temperature pipes and high-steel-grade pipeline pipes.
Background
The heat treatment of the large-caliber high-steel-grade pipeline steel pipe is mainly carried out by adopting a stepping furnace or a trolley furnace, and the surface oxidation of the steel pipe is heavy due to high heating temperature, the ovality of the steel pipe is large, and the heat treatment cost is high.
Disclosure of Invention
The invention aims to provide an online heat treatment method for a low-temperature pipe and a high-steel grade pipeline pipe, which aims to solve the problems in the prior art.
The technical scheme of the invention is as follows: an on-line heat treatment method for low-temperature pipes and high-steel-grade pipeline pipes is characterized in that hot-rolled pierced billets are heated to 950-1000 ℃, oxide skins on the outer surfaces of the pierced billets are removed through high-pressure water, and the pierced billets are quickly cooled after sizing.
Preferably, the steel pipe is rolled and then heated, and the heating temperature is 950-1000 ℃.
Preferably, the steel pipe is descaled by high-pressure water to remove scale on the outer surface.
Preferably, the steel pipe is rapidly cooled by a cooling water tank consisting of a plurality of rows of high-pressure nozzles to obtain a fine-grained ferrite and bainite strengthening phase structure.
Preferably, the steel pipe is a pipe with the diameter phi of 219-965 mm, the low-temperature pipe is Gr6, and the grade of pipeline steel is X60-X80.
The invention has the beneficial effects that: by carrying out on-line heat treatment on the pierced billet, a high-quality low-temperature pipe and a high-steel-grade pipeline pipe with the grade of X60-X80 can be economically produced, and the market competitiveness of the large-caliber low-temperature pipe and the pipeline pipe is greatly improved.
Detailed Description
An on-line heat treatment method for low-temperature pipes and high-steel-grade pipeline pipes is characterized in that hot-rolled pierced billets are heated to 950-1000 ℃, oxide skins on the outer surfaces of the pierced billets are removed through high-pressure water, and the pierced billets are quickly cooled after sizing.
And (3) rolling the steel pipe and then heating, wherein the heating temperature is 950-1000 ℃.
And descaling the steel pipe by high-pressure water to remove the oxide skin on the outer surface.
The steel pipe is rapidly cooled by a cooling water tank consisting of a plurality of rows of high-pressure nozzles to obtain a fine-grain ferrite and bainite strengthening phase structure.
The steel pipe has the diameter phi of 219-965 mm, the low-temperature pipe is Gr6, and the grade of pipeline steel is X60-X80.
Claims (5)
1. An on-line heat treatment method for low-temperature pipes and high-steel grade pipeline pipes is characterized by comprising the following steps: the hot-rolled pierced billet is heated to 950-1000 ℃ again, oxide skin on the outer surface of the pierced billet is removed through high-pressure water, and the pierced billet is rapidly cooled after sizing.
2. The on-line heat treatment method for the low-temperature pipe and the high-steel grade pipeline pipe according to claim 1, which is characterized in that: and (3) rolling the steel pipe and then heating, wherein the heating temperature is 950-1000 ℃.
3. The on-line heat treatment method for the low-temperature pipe and the high-steel grade pipeline pipe according to claim 1, which is characterized in that: and descaling the steel pipe by high-pressure water to remove the oxide skin on the outer surface.
4. The on-line heat treatment method for the low-temperature pipe and the high-steel grade pipeline pipe according to claim 1, which is characterized in that: the steel pipe is rapidly cooled by a cooling water tank consisting of a plurality of rows of high-pressure nozzles to obtain a fine-grain ferrite and bainite strengthening phase structure.
5. The on-line heat treatment method for the low-temperature pipe and the high-steel grade pipeline pipe according to claim 1, which is characterized in that: the steel pipe has the diameter phi of 219-965 mm, the low-temperature pipe is Gr6, and the grade of pipeline steel is X60-X80.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011644725.6A CN114686669A (en) | 2020-12-31 | 2020-12-31 | Online heat treatment method for low-temperature pipe and high-steel-grade pipeline pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011644725.6A CN114686669A (en) | 2020-12-31 | 2020-12-31 | Online heat treatment method for low-temperature pipe and high-steel-grade pipeline pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114686669A true CN114686669A (en) | 2022-07-01 |
Family
ID=82135719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011644725.6A Pending CN114686669A (en) | 2020-12-31 | 2020-12-31 | Online heat treatment method for low-temperature pipe and high-steel-grade pipeline pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114686669A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075041A (en) * | 1976-06-14 | 1978-02-21 | Nippon Steel Corporation | Combined mechanical and thermal processing method for production of seamless steel pipe |
| JPH1190511A (en) * | 1997-09-26 | 1999-04-06 | Sumitomo Metal Ind Ltd | Method and equipment for manufacturing seamless steel tube excellent in surface property |
| CN103866203A (en) * | 2014-01-15 | 2014-06-18 | 扬州龙川钢管有限公司 | Seamless steel pipe for large-aperture high-strength bridge and TMCP production method thereof |
| CN108531828A (en) * | 2018-02-23 | 2018-09-14 | 衡阳华菱连轧管有限公司 | Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application |
| CN108531806A (en) * | 2018-04-17 | 2018-09-14 | 东北大学 | A kind of high-strength tenacity hot rolled seamless steel tube and preparation method thereof |
| CN110404972A (en) * | 2019-07-15 | 2019-11-05 | 扬州诚德钢管有限公司 | A kind of production method for the seamless steel pipe that diameter is 1422mm |
-
2020
- 2020-12-31 CN CN202011644725.6A patent/CN114686669A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075041A (en) * | 1976-06-14 | 1978-02-21 | Nippon Steel Corporation | Combined mechanical and thermal processing method for production of seamless steel pipe |
| JPH1190511A (en) * | 1997-09-26 | 1999-04-06 | Sumitomo Metal Ind Ltd | Method and equipment for manufacturing seamless steel tube excellent in surface property |
| CN103866203A (en) * | 2014-01-15 | 2014-06-18 | 扬州龙川钢管有限公司 | Seamless steel pipe for large-aperture high-strength bridge and TMCP production method thereof |
| CN108531828A (en) * | 2018-02-23 | 2018-09-14 | 衡阳华菱连轧管有限公司 | Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application |
| CN108531806A (en) * | 2018-04-17 | 2018-09-14 | 东北大学 | A kind of high-strength tenacity hot rolled seamless steel tube and preparation method thereof |
| CN110404972A (en) * | 2019-07-15 | 2019-11-05 | 扬州诚德钢管有限公司 | A kind of production method for the seamless steel pipe that diameter is 1422mm |
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