CN111020159A - Heat treatment process for thin-wall rectangular and square welded steel pipe - Google Patents
Heat treatment process for thin-wall rectangular and square welded steel pipe Download PDFInfo
- Publication number
- CN111020159A CN111020159A CN201911289603.7A CN201911289603A CN111020159A CN 111020159 A CN111020159 A CN 111020159A CN 201911289603 A CN201911289603 A CN 201911289603A CN 111020159 A CN111020159 A CN 111020159A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- welded steel
- welded
- welding seam
- heat treatment
- 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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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000010438 heat treatment Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 238000004381 surface treatment Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 229910000746 Structural steel Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000012937 correction Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- 229910000734 martensite Inorganic materials 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- 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 discloses a heat treatment process for a thin-wall rectangular and square welding seam steel pipe, which comprises the following steps: 1) heating: placing the welded steel pipe on a supporting wheel with adjustable speed, and continuously passing through 4-8 medium-frequency heating furnace chambers at the speed of 1.5-4 m/min to heat the welded steel pipe, wherein the heating temperature is 800-; 2) and (3) cooling: spraying water on the surface of the heated welded steel pipe for cooling, so that the welded steel pipe is cooled to below 100 ℃ within 1-10 s; 3) and (3) correction: straightening the cooled welding seam steel pipe by using 2-5 groups of straightening roll shafts with corresponding specifications; 4) surface treatment: and polishing the straightened welding seam steel pipe by using a steel wire brush. The invention can improve the tensile strength of the welded steel pipe by 1300 MPa to 2000 MPa, improves the service strength of the welded steel pipe, and is beneficial to improving the strength and the safety of a vehicle applying the welded steel pipe.
Description
Technical Field
The invention relates to the technical field of heat treatment of welded seam steel pipes, in particular to a heat treatment process of thin-wall rectangular and square welded seam steel pipes.
Background
When the thin-wall welding seam steel pipe produced by plain carbon steel and low-alloy carbon structural steel is subjected to heat treatment, the thin-wall welding seam steel pipe has the advantages of fast heat dissipation, difficult temperature control, uneven heating temperature, uneven water spraying and cooling, uneven performance after heat treatment and bending deformation. Therefore, the process control difficulty is very high, and at present, the domestic market of the heat treatment process of the square steel pipe for the thin-wall welding seam rectangle still has a blank.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a heat treatment process for thin-wall rectangular and square welded steel pipes, aiming at improving the physical properties of the thin-wall rectangular and square welded steel pipes, and having good straightness and high service strength.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a heat treatment process for a thin-wall rectangular and square welding seam steel pipe, which comprises the following steps:
1) heating: placing the welded steel pipe on a speed-adjustable stripping wheel, enabling the welded steel pipe to continuously pass through 4-8 medium-frequency heating furnace chambers at the speed of 1.5-4 m/min, heating the welded steel pipe at the temperature of 800-;
2) and (3) cooling: spraying water on the surface of the heated welded seam steel pipe for cooling, so that the welded seam steel pipe is cooled to be below 100 ℃ within 1-10s, and the welded seam steel pipe material is changed into a martensite structure;
3) and (3) correction: straightening the cooled welding seam steel pipe by using 2-5 groups of straightening roll shafts with corresponding specifications;
4) surface treatment: and polishing the straightened welding seam steel pipe by using a steel wire brush to remove oxides on the surface of the steel pipe.
Preferably, the welded steel pipe has a wall thickness of 1-2 mm.
Preferably, the welded steel pipe is made of plain carbon steel or low-alloy carbon structural steel.
The invention has the beneficial effects that: the invention can improve the strength of the welding seam steel pipe produced by plain carbon steel and low-alloy carbon structural steel to 1300 MPa to 2000 MPa, improve the service strength and straightness of the welding seam steel pipe, and is beneficial to improving the strength and safety of vehicles using the welding seam steel pipe.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A heat treatment process for thin-wall rectangular and square welded steel pipes comprises the following steps:
1) heating: placing the welded steel pipe on a speed-adjustable stripping wheel, and continuously passing through 4 groups of medium-frequency heating at the speed of 1.5m/min, wherein the heating temperature is 800 ℃, the medium-frequency heating rate frequency is controlled at 2500Hz, and the length of each furnace chamber is 50 cm;
2) and (3) cooling: spraying water on the surface of the heated welded seam steel pipe for cooling, so that the welded seam steel pipe is cooled to be below 100 ℃ within 1s, and the welded seam steel pipe material is changed into a martensite structure;
3) and (3) correction: straightening the cooled welding seam steel pipe by using 2 or 3 groups of straightening roll shafts with corresponding specifications;
4) surface treatment: and polishing the straightened welding seam steel pipe by using a steel wire brush to remove oxides on the surface of the steel pipe.
Furthermore, the welding seam steel pipe is a rectangular steel pipe with the wall thickness of 1.0 mm.
Example 2
A heat treatment process for thin-wall rectangular and square welded steel pipes comprises the following steps:
1) heating: placing the welded steel pipe on a speed-adjustable stripping wheel, and continuously passing through 6 medium-frequency heating furnace chambers at a speed of 2.5m/min to heat the welded steel pipe, wherein the heating temperature is 900 ℃, the medium-frequency heating rate frequency is controlled at 2700Hz, and the length of each furnace chamber is 35 cm;
2) and (3) cooling: spraying water on the surface of the heated welded seam steel pipe for cooling, so that the welded seam steel pipe is cooled to be below 100 ℃ within 5 seconds, and the welded seam steel pipe material is changed into a martensite structure;
3) and (3) correction: straightening the cooled welding seam steel pipe by utilizing 2 groups or 3 groups of straightening roll shafts with corresponding specifications;
4) surface treatment: and polishing the straightened welding seam steel pipe by using a steel wire brush to remove oxides on the surface of the steel pipe.
Furthermore, the welding seam steel pipe is a square steel pipe with the wall thickness of 1.5 mm.
Example 3
A heat treatment process for thin-wall rectangular and square welded steel pipes comprises the following steps:
1) heating: placing the welded steel pipe on a speed-adjustable stripping wheel, and continuously passing through 8 furnace chambers at a speed of 4m/min to heat the welded steel pipe, wherein the heating temperature is 970 ℃, the frequency of the medium-frequency heating rate is controlled at 3200Hz, and the length of each furnace chamber is 25 cm;
2) and (3) cooling: spraying water on the surface of the heated welded seam steel pipe for cooling, so that the welded seam steel pipe is cooled to be below 100 ℃ within 10 seconds, and the welded seam steel pipe material is changed into a martensite structure;
3) and (3) correction: straightening the cooled welding seam steel pipe by utilizing 2 groups or 5 groups of straightening roll shafts with corresponding specifications;
4) surface treatment: and polishing the straightened welding seam steel pipe by using a steel wire brush to remove oxides on the surface of the steel pipe.
Furthermore, the welding seam steel pipe is a rectangular steel pipe with the wall thickness of 2 mm.
And (3) performance test: GB/T228-2002 is adopted to detect the tensile strength of the product of the welding seam steel pipe treated in the embodiment 1-3 of the invention, and the test shows that the tensile strength is 1300 MPa-2000 MPa, and the service strength of the welding seam steel pipe is greater than that of the base material before treatment.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A heat treatment process for thin-wall rectangular and square welded steel pipes is characterized by comprising the following steps:
1) heating: placing the welded steel pipe on a speed-adjustable stripping wheel, enabling the welded steel pipe to continuously pass through 4-8 medium-frequency heating furnace chambers at the speed of 1.5-4 m/min, heating the welded steel pipe at the temperature of 800-;
2) and (3) cooling: spraying water on the surface of the heated welded steel pipe for cooling, so that the welded steel pipe is cooled to below 100 ℃ within 1-10 s;
3) straightening: straightening the cooled welding seam steel pipe by using 2-5 groups of straightening roll shafts with the corresponding specifications of the welding seam steel pipe;
4) surface treatment: and polishing the straightened welding seam steel pipe by using a steel wire brush.
2. The heat treatment process of the thin-walled rectangular and square welded steel tube according to claim 1, wherein the wall thickness of the welded steel tube is 1-2 mm.
3. The heat treatment process of claim 1, wherein the welded steel tube is made of plain carbon steel or low alloy carbon structural steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911289603.7A CN111020159A (en) | 2019-12-14 | 2019-12-14 | Heat treatment process for thin-wall rectangular and square welded steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911289603.7A CN111020159A (en) | 2019-12-14 | 2019-12-14 | Heat treatment process for thin-wall rectangular and square welded steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111020159A true CN111020159A (en) | 2020-04-17 |
Family
ID=70210894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911289603.7A Pending CN111020159A (en) | 2019-12-14 | 2019-12-14 | Heat treatment process for thin-wall rectangular and square welded steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111020159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375879A (en) * | 2020-11-30 | 2021-02-19 | 韩广海 | Rectangular square tube quenching treatment system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481995A (en) * | 2008-01-11 | 2009-07-15 | 江苏嘉宝科技制管有限公司 | High steel level petroleum casing pipe and oil pipe manufacturing process |
| CN102363835A (en) * | 2011-10-28 | 2012-02-29 | 东北大学 | Intermediate frequency induction heat treatment device for steel tubes, and heat treatment method of the same |
| CN102586568A (en) * | 2012-03-22 | 2012-07-18 | 内蒙古包钢钢联股份有限公司 | Intermediate frequency induction heat-treatment process for seamless steel pipe |
| CN105925883A (en) * | 2016-05-27 | 2016-09-07 | 宝鸡石油钢管有限责任公司 | High-strength and high-toughness N80Q petroleum casing pipe and manufacturing method thereof |
-
2019
- 2019-12-14 CN CN201911289603.7A patent/CN111020159A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481995A (en) * | 2008-01-11 | 2009-07-15 | 江苏嘉宝科技制管有限公司 | High steel level petroleum casing pipe and oil pipe manufacturing process |
| CN102363835A (en) * | 2011-10-28 | 2012-02-29 | 东北大学 | Intermediate frequency induction heat treatment device for steel tubes, and heat treatment method of the same |
| CN102586568A (en) * | 2012-03-22 | 2012-07-18 | 内蒙古包钢钢联股份有限公司 | Intermediate frequency induction heat-treatment process for seamless steel pipe |
| CN105925883A (en) * | 2016-05-27 | 2016-09-07 | 宝鸡石油钢管有限责任公司 | High-strength and high-toughness N80Q petroleum casing pipe and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375879A (en) * | 2020-11-30 | 2021-02-19 | 韩广海 | Rectangular square tube quenching treatment system |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20220104 Address after: 272000 east section of East Road, Liangshan sub district office, Liangshan County, Jining City, Shandong Province Applicant after: Liangshan Jifu New Material Co.,Ltd. Address before: 253600 No.79, hanyoufang village, Xiduan Township, Leling City, Dezhou City, Shandong Province Applicant before: Han Guanghai |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200417 |