CN201447494U - Water spray system of seamless steel tube high-temperature fast quenching device - Google Patents
Water spray system of seamless steel tube high-temperature fast quenching device Download PDFInfo
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- CN201447494U CN201447494U CN2009200464373U CN200920046437U CN201447494U CN 201447494 U CN201447494 U CN 201447494U CN 2009200464373 U CN2009200464373 U CN 2009200464373U CN 200920046437 U CN200920046437 U CN 200920046437U CN 201447494 U CN201447494 U CN 201447494U
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Abstract
The utility model discloses a water spray system of a seamless steel tube high-temperature fast quenching device, which relates to the processing technology of a seamless steel tube, in particular to the high-temperature fast quenching process technology. The water spray system comprises three groups of water spray devices, each group of water spray device comprises twelve steel tubes which are distributed in two rows with six at the upper row and six at the lower row, two rows of water spray holes are arranged on each steel tube along the lengthwise direction and are distributed in equal distance, and each group of water spray device is respectively provided with a control valve. The water spray system has the advantages that the investment of quenching heat-treatment equipment is greatly reduced, the quenching heat-treatment ability of an oil pipe can be effectively improved, the quenching quality is stable, the production efficiency is improved and the production cost is lowered.
Description
Technical field
The utility model relates to a kind of complete processing of weldless steel tube, particularly its high-temperature fast quenching Technology.
Background technology
Thermal treatment is the important procedure during the steel pipe cold-drawn is produced, and also can think the most important procedure in cold-drawn workshop, is called as special control operation.Heat treated first procedure of steel pipe is heating; Second operation work is insulation; Three process is cooling.Process of cooling is a steel pipe thermal treatment most critical operation, and it is determining steel pipe in cooled metallographic structure and mechanical property.Process for heat treatment of steel pipe in conjunction with different steel pipe speed of cooling, is divided into normalizing, annealing, tempering, quenching and other technology according to different steel pipe thermal treatment temps.It is most important a kind of technology in several technologies that steel pipe quenches, and steel pipe can make the over-all properties of steel pipe be greatly enhanced after quenching.Because the modified thermal treatment machinery of steel performance is relevant with the martensite percentage amounts that quenching obtained of steel, the martensite percentage amounts that the steel quenching is obtained is high more, and the comprehensive mechanical performance of steel is good more after modified thermal treatment.CCT curve and hardening capacity according to the 30Mn steel.Pass through relative method, can be similar to and draw 28Mn2 steel CCT curve and hardening capacity, promptly when speed of cooling during greater than 60 ℃/s, can obtain the martensitic stucture more than 50%, the through hardening performance satisfies high temperature and cools off Φ 114.3 * 6.35 following specification oil well pipe quenching hardness requirements fast.
Producing the metallurgical technology route that is adopted with the 28Mn2 steel is: blast furnace ironmaking, hot metal pretreatment, top-blown converter steelmaking, LF external refining, VD handle and round billet continuous casting.The chemical ingredients of steel is: C:0.30, and Si:0.28, Mn:1.5, P :≤0.018, S :≤0.008, Cr:0.20, Mo:0.014, Al:0.15, Ni:0.005, inclusion and five-harmful elements content all meet the regulation of API standard.Hardness test is carried out on the TH300 Rockwell hardometer.Adopt water quenching technology to need the steel grade that is suitable for this technology.And CCT curve and hardening capacity are the important evidence that can this steel grade of check satisfy the water quenching technology requirement, also are simultaneously the bases of formulating corresponding heat treating regime.CCT curve according to the 30Mn steel adopts similar relative method, can be similar to the CCT curve that draws the 28Mn2 steel.According to the related request of API standard,, should obtain the martensitic stucture more than 50% after the quenching for the N80Q grade of steel.Therefore, determine to obtain the speed of cooling of 50% martensitic stucture, have important directive significance for hardening capacity and the actual production of checking steel grade.After the complete austenitizing of 28Mn2 steel, when speed of cooling is the 60 ℃/S left and right sides, can obtain 50% martensitic stucture.Therefore selecting suitable quenching device is relevant important with water quenching technology to the martensitic stucture that obtains greater than 50%.
In the various quenching technologies of steel pipe, can reduce environmental pollution with water as quenchant, reduce production costs, improve pipe performance.3 kinds of forms that the steel pipe shrend mainly contains the quench rings quenching, tank quenches and stand quenches.
It is outer surface of steel tube or surfaces externally and internally to be sprayed quench that quench rings is quenched, and quenches while steel pipe advances on roller-way.This kind quenching mode production efficiency is lower, and production specification is more single, seldom adopts in recent years.
The tank quenching is that the steel pipe after the heating is placed the tank that is full of quenchant, utilizes the water cooling steel pipe inner and outer surface in the tank.The steel pipe that adopts this mode to quench is very easily crooked, the easier bending of particularly small-bore steel pipe.
It is a kind of novel steel tube quench cooled form that occurs in recent years that stand quenches, it is steel pipe to be placed on the quenching stand compress, in the steel pipe rotation, steel pipe is carried out the cooling of internal surface axial flow, outside surface laminar flow refrigerative shrend technology, this kind quenching mode can make steel pipe obtain comparatively ideal cooling performance, but this device structure complexity need take bigger place, and the cost of equipment own is very high, later maintenance and use cost are higher.
Oil well pipe is as a kind of comparatively special tube product, usually adopt low-carbon alloy or steel alloy manufacturing, the overwhelming majority is suitable to be that quenchant carries out quench cooled to handle the .28Mn2 steel be to be used for the steel grade that water quenching technology is produced N80 steel grade oil well casing body with water. according to the requirement of API standard, the steel grade of N80 grade of steel should obtain greater than 50% martensitic stucture after quenching, and this moment, the minimum hardness of material was determined by following formula: HRC
Min=52X (%C)+21.Can calculate the HRC of 28Mn2 steel according to this formula
MinBe about HRC36.Under different quenching, pairing apart from quenched end distance (hardenability index) by the 30Mn steel with HRC36.Adopt similar relative method, just can obtain the hardenability index Changing Pattern of 28Mn2 steel.Along with the rising of quenching temperature, the hardenability index of material also increases to 6.79mm from 4.78mm, promptly in this thickness range, contains 50% martensitic stucture in the sample tissue.
By above-mentioned the CCT curve of 28Mn2 material and the analytical results of hardening capacity are shown, select suitable system of heat treatment process, adopting the single face Cooling Quenching for wall thickness less than the 28Mn2 material steel pipe of 6.79mm is to contain greater than the martensitic stucture more than 50% in can guaranteeing fully to organize everywhere with the cross section.Thereby just can satisfy the structure property requirement of API 5CT/N80-Q by suitable tempering.
But adopt water as quenchant have that subcooling speed is too fast, cooling characteristic changes too characteristics such as sensitivity to water temperature, cause easily that hardening crack appears in tube product in the quench cooled process, hardness is uneven and distort phenomenon such as serious.
The utility model content
The utility model purpose is a kind of good combination property of utility model, oil well Φ 114.3 * 6.35 following specification high-temperature fast quenching of seamless steel pipes devices that cost is low, efficient is high.
The technical solution of the utility model is: comprise three groups of waterworkss, every group of waterworks is made up of 12 steel pipes, 12 steel pipes are divided into two rows, 6 of last rows, under arrange 6, it vertically offers two row's water spray eyes in every steel pipe upper edge, equidistantly arranges between the water spray eye, and every group of waterworks is provided with control valve respectively.
Three groups of waterworkss are arranged side by side the exit of stove at the bottom of roller, open three groups of waterworkss respectively by control valve when arriving fire door, remain at steel pipe and directly carry out high-temperature fast quenching under the pyritous situation when steel pipe thermal treatment in stove at the bottom of the roller is intact.Through suitable tempering, every mechanical performance index of steel pipe reaches the N80-Q grade of steel requirement of stipulating in the API standard fully to the steel pipe after quenching.The utility model has reduced the investment of quenching heat treatment equipment widely, can enlarge the oil pipe quenching heat treatment capacity effectively, and stable in quenching quality is enhanced productivity, and reduces production costs.
Be ejected into steel tube surface water-cooled area and anti-sealing to the stove internal reflux in order to increase, the every row of the utility model eye of spraying water is 30 ° along vertical curve to the angle that Way out tilts.
Described steel pipe is 60～100mm apart from the distance of quenching steel pipe.
Description of drawings
Fig. 1 is the structural representation of one group of waterworks of the present utility model.
Embodiment
As shown in Figure 1, every group of waterworks is made up of 12 steel pipes 1,12 steel pipes 1 are divided into two rows, 6 of last rows, under arrange 6, it vertically offers two row water spray eyes 2 in every steel pipe 1 upper edge, equidistantly arranges between the water spray eye 2, every row eye 2 of spraying water is 30 ° along vertical curve to the angle A that Way out tilts, and every group of waterworks is provided with control valve respectively.Steel pipe 1 is 60～100mm apart from the distance of quenching steel pipe 3.
Control method:
1, original state: by control valve water first and second group waterworks cuts out water spray, the 3rd group of waterworks opens, all can cut out.
2, working order:
(1) treat that the quench steel pipe advances the stove heating by material loading part, head advances to outlet of still, after the baffle plate alignment, promotes baffle plate, makes baffle plate do the circular arc upward movement, improves the roller-way rotating speed simultaneously and reaches 5m/ minute, makes steel pipe enter quenching device fast.
(2) when the steel pipe head arrives the middle part of first and second group waterworks, the control valve of first and second group waterworks is all opened, and first and second group waterworks begins water spray, and shrend begins.
When (3) steel pipe broke away from the 3rd group of waterworks by high-speed cruising to steel pipe afterbody, speed-raising roller-way reduction of speed was reduced to usual dispatch, and first and second group waterworks control valve is closed simultaneously.
(4) steel pipe advances to discharging roller-way, blanking.
(5) next circulation beginning, the second stove steel pipe is waited to quench.
Claims (3)
1. the water spray system of high-temperature fast quenching of seamless steel pipes device, it is characterized in that comprising three groups of waterworkss, every group of waterworks is made up of 12 steel pipes, 12 steel pipes are divided into two rows, 6 of last rows, 6 of following rows, it vertically offers two row's water spray eyes in every steel pipe upper edge, equidistantly arrange between the water spray eye, every group of waterworks is provided with control valve respectively.
2. according to the water spray system of the described high-temperature fast quenching of seamless steel pipes device of claim 1, it is characterized in that every row eye of spraying water is 30 ° along vertical curve to the angle that Way out tilts.
3. according to the water spray system of the described high-temperature fast quenching of seamless steel pipes device of claim 1, it is characterized in that described steel pipe is 60～100mm apart from the distance of quenching steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200464373U CN201447494U (en) | 2009-06-10 | 2009-06-10 | Water spray system of seamless steel tube high-temperature fast quenching device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200464373U CN201447494U (en) | 2009-06-10 | 2009-06-10 | Water spray system of seamless steel tube high-temperature fast quenching device |
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| Publication Number | Publication Date |
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| CN201447494U true CN201447494U (en) | 2010-05-05 |
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| CN2009200464373U Expired - Fee Related CN201447494U (en) | 2009-06-10 | 2009-06-10 | Water spray system of seamless steel tube high-temperature fast quenching device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433419A (en) * | 2011-12-29 | 2012-05-02 | 上海交通大学 | Water-through quenching cooling device and method capable of realizing rapid cooling through slit water injection |
| US11492680B2 (en) | 2020-07-14 | 2022-11-08 | Northeastern University | Water spray system for heat treatment of metal plate strips and control method |
-
2009
- 2009-06-10 CN CN2009200464373U patent/CN201447494U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433419A (en) * | 2011-12-29 | 2012-05-02 | 上海交通大学 | Water-through quenching cooling device and method capable of realizing rapid cooling through slit water injection |
| CN102433419B (en) * | 2011-12-29 | 2013-08-07 | 上海交通大学 | Water-through quenching cooling device and method capable of realizing rapid cooling through slit water injection |
| US11492680B2 (en) | 2020-07-14 | 2022-11-08 | Northeastern University | Water spray system for heat treatment of metal plate strips and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TAIZHOU CHENGDE STEEL TUBE CO., LTD. Free format text: FORMER OWNER: JIANGSU CHENGDE STEEL PIPE CO., LTD. Effective date: 20120305 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 225200 YANGZHOU, JIANGSU PROVINCE TO: 225300 TAIZHOU, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120305 Address after: 225300 No. 28 Yongsheng Road, Gaogang hi tech Zone, Jiangsu, Taizhou Patentee after: Taizhou Chengde Steel Tube Co., Ltd. Address before: 225200 Jiangsu Province Jiangdu Cheng Road No. 1 Patentee before: Jiangsu Chengde Steelpipe Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100505 Termination date: 20180610 |
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| CF01 | Termination of patent right due to non-payment of annual fee |