CN207567290U - On-line quenching device and production line for quenching and tempering heat treatment of steel pipe - Google Patents
On-line quenching device and production line for quenching and tempering heat treatment of steel pipe Download PDFInfo
- Publication number
- CN207567290U CN207567290U CN201721589194.9U CN201721589194U CN207567290U CN 207567290 U CN207567290 U CN 207567290U CN 201721589194 U CN201721589194 U CN 201721589194U CN 207567290 U CN207567290 U CN 207567290U
- Authority
- CN
- China
- Prior art keywords
- quenching
- steel pipe
- toroidal shell
- flat mouth
- production line
- 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.)
- Active
Links
- 238000010791 quenching Methods 0.000 title claims abstract description 72
- 230000000171 quenching effect Effects 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 44
- 239000010959 steel Substances 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 238000005496 tempering Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000498 cooling water Substances 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims description 23
- 238000004513 sizing Methods 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000007669 thermal treatment Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000005242 forging Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
The utility model discloses a production line of online guenching unit and steel pipe quenching and tempering thermal treatment, online guenching unit includes annular casing (3), and the internal surface of annular casing (3) is equipped with a plurality of flat mouthful of nozzles (1), is equipped with water inlet (31) on annular casing (3), is equipped with in annular casing (3) and flows in (30) with flat mouthful of nozzle (1) intercommunication, and the cooling water can be in proper order through water inlet (31) and flow in (30) back from flat mouthful of nozzle (1) blowout and be the slice, and the axis of annular casing (3) sets up for the plane slope at this flaky cooling water place. The online quenching device and the production line for quenching and tempering heat treatment of the steel pipe can replace the existing off-line quenching, thereby greatly saving the production cost; and the strength performance is improved, the ratio of unqualified quantity is reduced, the cooling temperature of the thick-wall pipe is greatly reduced, the subsequent processes of sawing and the like are facilitated, the loss is greatly reduced, the on-line cooling is controlled, and the economic benefit is remarkable.
Description
Technical field
The utility model is related to steel pipe Field of Heat-treatment, particularly a kind of press quenching device or a kind of steel pipe tune
The production line of matter heat treatment.
Background technology
For seamless steel pipe, generally use annealing, normalizing, quenching, tempering etc. come be heat-treated obtain needed for performance.Quenching is
Seamless steel pipe is heated to given temperature more than phase transition temperature, held for some time, a kind of heat treatment being then quickly cooled down
Technique is to obtain obtaining required mechanical property after martensite is tempered so as to proper temperature；Tempering is to heat seamless steel pipe
A certain temperature below to austenite-pearlite transformation temperature after suitably keeping the temperature, is cooled to the heat treatment process of room temperature, is
To obtain tissue and performance needed for seamless steel pipe；In order to obtain some strength and toughness, quenching and high tempering are combined
Come, referred to as quenching-and-tempering process.It is common quenched on the continuous stepping heat-treatment production line comprising glowing furnace and tempering furnace
It carries out, using out-line quenching, shortcoming is low production efficiency for quenching.
Utility model content
In order to solve the problems, such as steel pipe Tempering and Quenching low production efficiency, the utility model provides a kind of press quenching dress
The production line with steel pipe Tempering and Quenching is put, the production line of the press quenching device and steel pipe Tempering and Quenching can substitute existing
Out-line quenching, greatly save production cost；And improve strength character, reduce the accounting of unqualified amount, ensure thick-walled pipe
Cooling temperature is greatly lowered, and conducive to processes such as follow-up sawings, greatly reduces loss, remarkable in economical benefits cold in line traffic control.
Technical solution is used by the utility model solves its technical problem：
A kind of press quenching device, including at least one toroidal shell, the inner surface of toroidal shell is equipped with multiple flat mouth sprays
Mouth, toroidal shell are equipped with water inlet, are equipped with the inner flow passage connected with flat mouth nozzle in toroidal shell, cooling water can pass through successively
Cross after water inlet and inner flow passage and to be sprayed from flat mouth nozzle and in the form of sheets, the axis of toroidal shell relative to the sheet cooling water institute
Plane be obliquely installed.
Toroidal shell is cirque structure, and the section of toroidal shell is rectangular, and multiple flat mouth nozzles are in toroidal shell
Surface is staggered in the ranks of rule, along the axis direction of toroidal shell, the injection direction all same of all flat mouth nozzles.
Flat mouth nozzle contains sequentially connected fan-shaped section, changeover portion, twist-on section and thread segment, and flat mouth nozzle passes through thread segment
It is threadedly coupled with toroidal shell, the center line of thread segment is set along the radial direction of toroidal shell, and the jet port of flat mouth nozzle is located at fan
One end of shape section, jet port are arc.
A kind of production line of steel pipe Tempering and Quenching contains the first heater, punch, rolling and de- set gradually
Pipe device, sizing mill, secondary heating mechanism, quenching unit and third heating unit, the quenching unit are above-mentioned press quenching
Device.
The first heater is annular furnace or stepping furnace.
The rolling and de- pipe device are the tandem rolling tube machine and winding arbor extraction press or the rolling that set gradually and de- pipe device is oblique
Milling train or the rolling and de- pipe device are the CPE push-bench and rod stripping machine set gradually.
The secondary heating mechanism is induction heating apparatus.
The beneficial effects of the utility model are：The press quenching device, the production line of steel pipe Tempering and Quenching and production work
Artistic skill enough substitutes existing out-line quenching, greatlys save production cost；And improve strength character, reduce accounting for for unqualified amount
Than, ensure that the cooling temperature of thick-walled pipe is greatly lowered, conducive to processes such as follow-up sawings, greatly reduce loss, warp cold in line traffic control
Ji remarkable benefit.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality
Novel illustrative embodiments and their description do not form the improper restriction to the utility model for explaining the utility model.
Fig. 1 is the overall structure axonometric drawing of press quenching device described in the utility model.
Fig. 2 is the axonometric drawing of toroidal shell.
Fig. 3 is the front view of toroidal shell.
Fig. 4 is the sectional view of toroidal shell.
Fig. 5 is the front view of flat mouth nozzle.
Fig. 6 is the axonometric drawing of flat mouth nozzle.
Fig. 7 is the structure diagram of the production line of steel pipe Tempering and Quenching described in the utility model.
Fig. 8 is the flow chart of the production technology of steel pipe Tempering and Quenching described in the utility model.
1st, flat mouth nozzle；2nd, water inlet pipe；3rd, toroidal shell；4th, hot steel pipe；
10th, jet port；11st, fan-shaped section；12nd, changeover portion；13rd, twist-on section；14th, thread segment；
30th, inner flow passage；31st, water inlet；32nd, it is discharged screw hole.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of press quenching device, including at least one toroidal shell 3, the inner surface of toroidal shell 3 is equipped with multiple flat mouths
Nozzle 1, toroidal shell 3 are equipped with water inlet 31, the inner flow passage 30 connected with flat mouth nozzle 1, cooling water are equipped in toroidal shell 3
Can spray successively from flat mouth nozzle 1 after water inlet 31 and inner flow passage 30 and in the form of sheets, the axis of toroidal shell 3 relative to
Plane where the cooling water of the sheet is obliquely installed, as shown in Figure 1.
In the present embodiment, which can contain multiple toroidal shells 3, the size of each toroidal shell 3
With structure all same, the axis of each toroidal shell 3 overlaps.When carrying out quenching technical, hot steel pipe 4 is advanced along direction A,
So as to quickly be cooled near transformation temperature (phase transition temperature).The press quenching device can substitute out-line quenching device, so as to
Production cost is greatlyd save, improves production efficiency.
In the present embodiment, toroidal shell 3 is cirque structure, and the section of toroidal shell 3 is rectangular, multiple flat mouth nozzles
1 toroidal shell 3 inner surface in rule ranks it is staggered, along the axis direction of toroidal shell 3, all flat mouth nozzles
1 injection direction all same, i.e., the injection direction of flat mouth nozzle 1 is towards the paper of Fig. 3 outside, it is understood that is sprayed for flat mouth
The injection direction of mouth 1 is towards the right side of Fig. 4.
In the present embodiment, flat mouth nozzle 1 contains sequentially connected fan-shaped section 11, changeover portion 12, twist-on section 13 and screw thread
Section 14, flat mouth nozzle 1 is threadedly coupled by thread segment 14 with the water outlet screw hole 32 of toroidal shell 3, the center line edge of thread segment 14
The radial direction setting of toroidal shell 3, the jet port 10 of flat mouth nozzle 1 are located at one end of fan-shaped section 11, and jet port 10 is arc, is such as schemed
Shown in 5 and Fig. 6.
In the present embodiment, water inlet 31 is externally connected with water inlet pipe 2, inner surface of multiple flat mouth nozzles 1 along toroidal shell 3
Be circumferentially arranged, multiple flat mouth nozzles 1 toroidal shell 3 inner surface rule be arranged into fish scale stratiform, such as Fig. 2 to Fig. 4 institutes
Show.The jet port 10 of arc can spray the cooling water of slabbing towards the approaching side of hot steel pipe 4, as shown in Figure 1.The fan
Shape section 11 and the axis of twist-on section 13 tilt at an angle, are connected by changeover portion 12.The twist-on section 13 is used to make screw thread
Section 14 is screwed into the water outlet screw hole 32 of toroidal shell 3.
A kind of production line of steel pipe Tempering and Quenching is described below, the production line of the steel pipe Tempering and Quenching contains to be set successively
First heater, punch, rolling and de- pipe device, sizing mill, secondary heating mechanism, quenching unit and the third heating put
Device, the quenching unit are above-mentioned press quenching device.
In the present embodiment, which is the heating units such as annular furnace or stepping furnace.The rolling and de- pipe dress
Being set to the tandem rolling tube machine set gradually and winding arbor extraction press, either the rolling and de- pipe device are skew rolling mill or the rolling and de- pipe
Device is the CPE push-bench and rod stripping machine set gradually.The secondary heating mechanism can be that the sensing that can be heated to steel pipe adds
Thermal.Third heating unit may be the induction heating apparatus that can be heated to steel pipe.
The production line of the steel pipe Tempering and Quenching can also contain cold bed, which is located at after the third heating unit,
That is the production line of the steel pipe Tempering and Quenching contains the first heater set gradually, punch, milling train, winding arbor extraction press, sizing
Machine, secondary heating mechanism, quenching unit, third heating unit and cold bed, as shown in fig. 7, cold bed is used to implement the sky of hot steel pipe
Cold technique.Or i.e. the steel pipe Tempering and Quenching production line contain the first heater set gradually, punch, skew rolling mill,
Sizing mill, secondary heating mechanism, quenching unit, third heating unit and cold bed or the i.e. production line of the steel pipe Tempering and Quenching
Contain first heater, punch, CPE push-bench, rod stripping machine, sizing mill, secondary heating mechanism, the quenching dress set gradually
It puts, third heating unit and cold bed.
The production line of the steel pipe Tempering and Quenching can be also used for processing and only quench the steel pipe not being tempered, i.e., for not needing to
Quenched steel grade can take directly empty mistake, and the third heating unit does not work at this time, i.e., steel pipe after quenching unit no longer into
Row heating.
A kind of production technology of steel pipe Tempering and Quenching is described below, the production technology of the steel pipe Tempering and Quenching uses
The production line of above-mentioned steel pipe Tempering and Quenching, the production technology include the following steps：
Step 1, heating pipe；
Step 2, perforation；
Step 3, rolling；
Step 4, de- pipe；
Step 5, sizing；
Step 6, quenching；
Step 7, tempering, as shown in Figure 8.
Below to the production technology of above-mentioned steel pipe Tempering and Quenching, it is described in detail：
Step 1, pipe is heated；
Pipe enters first heater (such as annular furnace), the first heater by the heating of pipe blank to 1200 DEG C~
1300 DEG C of formation heat pipe bases, then come out of the stove and transport the heat pipe base to punch；
Step 2, it perforates；
The heat pipe base perforated machine pierced billet is into hollow billet, in the perforation procedure, the temperature of the hollow billet be in 1100 DEG C~
1200 DEG C, then the hollow billet is transported to milling train (such as tandem rolling tube machine) again；
Step 3, rolling；
The hollow billet is rolled into hollow forging through milling train (such as tandem rolling tube machine), and in the operation of rolling, the temperature of the hollow forging is in 950
DEG C~1050 DEG C, the hollow forging is then delivered to winding arbor extraction press again；
Step 4, de- pipe；
Winding arbor extraction press disengages the hollow forging from plug, then again transports the hollow forging to sizing mill；
Step 5, sizing；
The hollow forging obtains hot production tube on sizing mill by sizing, in the Sizing Process, the temperature of the hot production tube
In 760 DEG C~860 DEG C, because the size temperature of finished product thickness of pipe wall may have differences；
Step 6, quenching；
The hot production tube is after sizing mill comes out, using secondary heating mechanism (such as induction heating apparatus) by the hot production tube
It is heated to 950 DEG C or more；Then it is fast by the hot production tube with certain speed within tens of seconds to use above-mentioned press quenching device
Speed is cooled to less than 500 DEG C；
Step 7, tempering；
After completing press quenching, the hot production tube is heated to 650 using third heating unit (such as induction heating apparatus)
DEG C~700 DEG C, then the finished product heat pipe is air-cooled (can be in or be not on cold bed realize air-cooled).
Exist in above-mentioned sizing process (step), can be used and subtract technique.For not needing to quenched steel grade, can take directly
Empty mistake does not need to carrying out tempering process at this time, i.e. steel pipe is no longer heated after quenching unit.
In above-mentioned steps 6, when the hot production tube is by 950 DEG C or more the phase point temperature for being cooled to austenite (phase alternating temperatures
Degree) when, press quenching device cools down the hot production tube using the first cooling velocity, and the metallographic structure of the hot production tube is made to form iron
Ferritic and pearlite；Or the hot production tube is cooled down using the second cooling velocity, the metallographic structure of the hot production tube is made to form bayesian
Body and ferrite；Or the hot production tube is cooled down using third cooling velocity, the metallographic structure of the hot production tube is made to form martensite；
The third cooling velocity is more than the second cooling velocity, which is more than the first cooling velocity.Above-mentioned first cooling speed
Degree, the second cooling velocity, the concrete numerical value of third cooling velocity can be obtained by many experiments measurement.
I.e. in above-mentioned steps 6, when the hot production tube A tissue (austenite) be cooled near dynamic phase trasnsition point, use
First cooling velocity obtains F+P tissues (ferrite+pearlite)；B+F tissue (bainites+iron are obtained using the second cooling velocity
Ferritic)；M tissues (martensite) are obtained using third cooling velocity.
The above, only specific embodiment of the utility model, it is impossible to which the range of utility model implementation, institute are limited with it
The equivalent variations made with the displacement of its equivalent assemblies or according to the utility model patent protection domain and modification, should all still fall within
The scope that this patent is covered.In addition, between technical characteristic and technical characteristic in the utility model, technical characteristic and technical solution
Between, between technical solution and technical solution use can be freely combined.
Claims (7)
1. a kind of press quenching device, which is characterized in that the press quenching device includes at least one toroidal shell (3), ring
The inner surface of shape housing (3) is equipped with multiple flat mouth nozzles (1), and toroidal shell (3) is equipped with water inlet (31), toroidal shell (3)
It is interior equipped with the inner flow passage (30) connected with flat mouth nozzle (1), cooling water can pass through water inlet (31) and inner flow passage (30) successively
It is sprayed afterwards from flat mouth nozzle (1) and in the form of sheets, the axis of toroidal shell (3) inclines relative to the plane where the cooling water of the sheet
Tiltedly setting.
2. press quenching device according to claim 1, which is characterized in that toroidal shell (3) is cirque structure, annular
The section of housing (3) is rectangular, and multiple flat mouth nozzles (1) are staggered in the ranks of rule in the inner surface of toroidal shell (3),
Along the axis direction of toroidal shell (3), the injection direction all same of all flat mouth nozzles (1).
3. press quenching device according to claim 1, which is characterized in that flat mouth nozzle (1) contains sequentially connected fan
Shape section (11), changeover portion (12), twist-on section (13) and thread segment (14), flat mouth nozzle (1) pass through thread segment (14) and circular casing
Body (3) is threadedly coupled, and the center line of thread segment (14) is set along the radial direction of toroidal shell (3), the jet port of flat mouth nozzle (1)
(10) positioned at one end of fan-shaped section (11), jet port (10) is arc.
4. a kind of production line of steel pipe Tempering and Quenching, which is characterized in that the production line of the steel pipe Tempering and Quenching contains successively
The first heater of setting, punch, rolling and de- pipe device, sizing mill, secondary heating mechanism, quenching unit and third add
Thermal, the quenching unit are the press quenching device described in any one in claims 1 to 3.
5. the production line of steel pipe Tempering and Quenching according to claim 4, which is characterized in that the first heater is ring
Shape stove or stepping furnace.
6. the production line of steel pipe Tempering and Quenching according to claim 4, which is characterized in that the rolling and de- pipe device are
Either the rolling and de- pipe device are skew rolling mill or the rolling and de- pipe device to the tandem rolling tube machine and winding arbor extraction press set gradually
For the CPE push-bench and rod stripping machine set gradually.
7. the production line of steel pipe Tempering and Quenching according to claim 4, which is characterized in that the secondary heating mechanism is sense
Answer heating unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721589194.9U CN207567290U (en) | 2017-11-24 | 2017-11-24 | On-line quenching device and production line for quenching and tempering heat treatment of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721589194.9U CN207567290U (en) | 2017-11-24 | 2017-11-24 | On-line quenching device and production line for quenching and tempering heat treatment of steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207567290U true CN207567290U (en) | 2018-07-03 |
Family
ID=62691967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721589194.9U Active CN207567290U (en) | 2017-11-24 | 2017-11-24 | On-line quenching device and production line for quenching and tempering heat treatment of steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207567290U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107739794A (en) * | 2017-11-24 | 2018-02-27 | 北京京诚之星科技开发有限公司 | Online quenching device, production line and production process for quenching and tempering heat treatment of steel pipe |
| CN109957646A (en) * | 2018-07-26 | 2019-07-02 | 大圆应用工程公司 | The refrigerant injection modular system of metal product for being heat-treated |
-
2017
- 2017-11-24 CN CN201721589194.9U patent/CN207567290U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107739794A (en) * | 2017-11-24 | 2018-02-27 | 北京京诚之星科技开发有限公司 | Online quenching device, production line and production process for quenching and tempering heat treatment of steel pipe |
| CN109957646A (en) * | 2018-07-26 | 2019-07-02 | 大圆应用工程公司 | The refrigerant injection modular system of metal product for being heat-treated |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1127383C (en) | Seamless steel pipe manufacturing method and equipment | |
| JP5262949B2 (en) | Manufacturing method and equipment for seamless steel pipe | |
| CN102382962B (en) | Quick spheroidizing annealing technology for GCr15 bearing steel pipe | |
| JP2721861B2 (en) | Direct quenching method for hot rolled steel wire | |
| CN107739794A (en) | Online quenching device, production line and production process for quenching and tempering heat treatment of steel pipe | |
| CN207567290U (en) | On-line quenching device and production line for quenching and tempering heat treatment of steel pipe | |
| CN109590417A (en) | A kind of forging technology and equipment of high-temperature-resistant high-pressure-resistant stainless steel ring | |
| CN104894485A (en) | Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm | |
| CN104963225B (en) | Many steel wire induction heating water cooling production lines | |
| CN106269916A (en) | A kind of hot rolled seamless steel tube On-line Control cooling system and process | |
| CN101829679B (en) | Production method for improving impact toughness of hot-rolled oil well pipe coupling material | |
| CN110153199A (en) | A kind of controlled rolling method of large scale rod bar | |
| CN207770461U (en) | A kind of titanium alloy hot seamless tube production system | |
| CN102009069A (en) | Manufacturing process of small-caliber hot rolling seamless steel tubes | |
| CN102586565B (en) | Rapid cooling method and device after medium and thick plate heat treatment furnace | |
| JPS5725209A (en) | Production of seamless metallic pipe | |
| CN104087826B (en) | Large-caliber thin-walled X65 level hot-expanding seamless steel tubes and production method | |
| CN100457926C (en) | High-strength low-alloy steel temperature control plate blank acceleration cooling system | |
| CN102534156A (en) | Heat treatment method for improving comprehensive mechanical performance of heat expansion pipe | |
| CN106964658A (en) | A kind of hot rolled seamless steel tube processing method and its device | |
| CN103978038B (en) | A kind of confession is cold rolling or the production method of the stainless-steel seamless pipe pipe of cold-drawn | |
| CN219253673U (en) | Intelligent waste heat on-line heat treatment device for special steel bar | |
| CN106238465B (en) | A kind of preparation method of PH stainless steel seamless steel pipe | |
| JPS563626A (en) | Manufacture of seamless steel pipe excellent in toughness | |
| CN109201756A (en) | The controlled rolling and controlled cooling method of 30MnSi rod iron for building |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220221 Address after: 100176 room l1-1018, 7 Jian'an street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee after: CERI Long Product Co.,Ltd. Patentee after: Capital Engineering & Research Incorporation Limited Address before: 100176 No.7 Jian'an street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee before: CERI TECHNOLOGY Co.,Ltd. Patentee before: Capital Engineering & Research Incorporation Limited |