CN109988890A - A kind of steel pipe process for quenching - Google Patents
A kind of steel pipe process for quenching Download PDFInfo
- Publication number
- CN109988890A CN109988890A CN201711474051.8A CN201711474051A CN109988890A CN 109988890 A CN109988890 A CN 109988890A CN 201711474051 A CN201711474051 A CN 201711474051A CN 109988890 A CN109988890 A CN 109988890A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- quenching
- water quenching
- interior
- cooling
- 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.)
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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
- 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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray 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
- 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
Abstract
The invention discloses a kind of steel pipe process for quenching, this method cools down the inner surface for the steel pipe being located in water quenching system first, in accordance with the interior spray delay time of setting, then cooling to the surfaces externally and internally of steel pipe simultaneously again, the surfaces externally and internally temperature difference to control the steel pipe stops the cooling treatment to the surfaces externally and internally of steel pipe when the temperature of steel pipe is cooled to martensite transformation temperature or less no more than 30 DEG C.This method can efficiently control its interior appearance cooling velocity, to achieve the purpose that reduction water quenching cracking risk and diminution section hardness are poor.
Description
Technical field
The present invention relates to seamless steel pipe entirety water quenching fields, and in particular to a kind of steel pipe process for quenching.
Background technique
During the modifier treatment of steel pipe, for the tube product with important use, such as oil well pipe, boiler tube,
It is generally required to be quenched to obtain ideal mechanical property, the cooling key link as quenching treatment is for Steel Pipe Heat
Production efficiency, end product quality and the economic benefit of processing all have important influence.Pass through the water quenching to seamless steel pipe
Fire processing, can be improved the hardness and wearability of steel pipe；Or quenching and the tempering cooperation of different temperatures can increase substantially
Steel pipe toughness and fatigue strength, to obtain the preferable steel pipe of comprehensive mechanical performance.
In the various quenching technologies of steel pipe, water can reduce environmental pollution as hardening media, reduce steel pipe cost, mention
High pipe performance.The middle carbon CrMo series steel pipe that seamless steel pipe entirety water quenching practical technique has been widely used in stronger harden ability is quenched
Fire production, capital equipment are horizontal steel pipe quenching press, water circulation system etc., currently, common water quenching both at home and abroad mainly have dipping,
Dipping plus interior axial injection (the outer immersion of spray in i.e.), outer surface laminated flow spray and outer surface section cooling add interior axially injection
(drenching formula outside i.e. interior spray) four kinds of modes, wherein leaching two kinds of cooling effects of formula are more quite a lot of outside the outer immersion of interior spray and interior spray, use scope
Also wide.It is more to be directed to the improvement of water quenching equipment, such as document " seamless steel at present in terms of the improvement of water quenching technology
State is used in the design and application of pipe water quenching equipment " (Xu Xianghong, Yang Likun, Zu Jiale, " metallurgical equipment ", 02 phase in 2010)
Inside and outside advanced " outer leaching+rotation+interior spray " quenching technical, has carried out a large amount of structure of modification, technological innovation to water quenching equipment,
The precision and mechanical performance for effectively raising steel pipe, the defects of greatly reducing hardening crack, bending, ellipse.For being soaked outside interior spray
Two kinds of water quenching methods of formula are drenched outside formula and interior spray, are all made of mode that is inside and outside cooling while carrying out in industry at present, i.e., for interior spray
Action sequence between time, outer leaching (leaching) time, interior spray and outer leaching (leaching) does not have the defects of default manual control, this is right
Cracking and section hardness unevenness have a significant impact after steel pipe water quenching.
Summary of the invention
It is an object of the invention to overcome the shortage of prior art, a kind of steel pipe process for quenching is provided, this method is suitable for interior
It sprays and drenches two kinds of water quenching methods of formula outside outer immersion and interior spray.
When due to steel pipe water quenching cracking and section hardness unevenness being mostly water quenching caused by interior appearance inhomogeneous cooling, the present invention
It is biggish for specification span by spray and outer leaching (leaching) time, the action sequence of two processes of reasonable arrangement in independent control
For steel pipe (such as outer diameter 76-273mm, wall thickness 7-80mm), its interior appearance cooling velocity can be efficiently controlled, to reach
It reduces water quenching cracking risk and reduces the purpose of section hardness difference.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of steel pipe process for quenching, in order to reduce appearance inhomogeneous cooling in steel pipe as far as possible, the present invention by according to supplied materials specification,
Different interior spray delay times (time of outer leaching (leaching) i.e. since interior be sprayed onto) Lai Shixian is selected, as thickness of steel pipe increases,
Spray delay time also gradually increases in it, so that the interior appearance temperature difference is as small as possible after guaranteeing water quenching, general control is within 30 DEG C.
This method is specific as follows:
The inner surface for the steel pipe being located in water quenching system is cooled down first, in accordance with the interior spray delay time of setting, it is then same again
When it is cooling to the surfaces externally and internally of steel pipe, to control the surfaces externally and internally temperature difference of the steel pipe no more than 30 DEG C, when the temperature of steel pipe is cold
Stop the cooling treatment to the surfaces externally and internally of steel pipe when but to below martensite transformation temperature.
In the above-mentioned methods, the water quenching system is that common interior spray in the art drenches formula water quenching system outside outer immersion or interior spray
System, such as the documented outer leaching internal combustion water quenching system in the utility model patent of Patent No. ZL201020117079.3.
In the above-mentioned methods, the outer diameter of the steel pipe is preferably 76-273mm, and wall thickness is preferably 7-80mm.
In the above-mentioned methods, the interior spray delay time of the setting is preferably 1-40s, and interior spray delay time is with steel pipe walls
Thick increase and increase.
In the above-mentioned methods, the material of the preferably described steel pipe is 4330VMOD or 13Cr.
Beneficial effects of the present invention: the present invention makes to spray in scene by the technological innovation of spray delay time setting in water quenching
The outer leaching practical controlled level of (leaching) water quenching has the raising of matter, quench split waste product by before technological innovation (i.e. without interior spray delay time
Setting, but directly to be located at water quenching system in steel pipe inner and outer surface layers simultaneously cool down) 3.5% or more, be reduced to
2.1% hereinafter, by 80,000 tons, 10,000 yuan/ton of quenched pipe selling price, 4000 yuan/ton of waste steel recycling calculating, Nian Chuanxiao 6720000 is produced per year
Member.In addition, being successfully applied to the steel grades such as strong harden ability seamless steel pipe 4330VMOD, 13Cr using this technological innovation water quenching
Water quenching production breaks colleague and unanimously thinks that the strong harden ability steel such as 4330VMOD, 13Cr is unable to the thinking of water quenching, there is wide hair
Exhibition prospect.
Specific embodiment
Below by way of specific embodiment, the present invention is described in detail, but the present invention is not limited thereto.
Embodiment 1
Within spray Water Quenching carried out to seamless steel pipe 13Cr for outer leaching water quenching method, wherein the outer diameter of steel pipe is 273mm, wall
Thickness is 30mm.The specific method is as follows:
When the complete steel pipe of heating is transported to water quenching system, interior water spray movement, preferential cooling pipe inner wall, by 12s are opened
Interior spray delay time after, steel pipe is immersed outside sink and is soaked with its cooling outer surface (water spray work always in during entire outer leaching
Make), surfaces externally and internally while cooling (the surfaces externally and internally temperature difference of steel pipe has descended to 30 DEG C or less), outer leaching after cooling 45s at this time
Interior spray stops, and for the temperature of steel pipe at 150 DEG C hereinafter, realizing the complete transformation of martensite, entire water quenching process is complete at this time
At.
Using the method coprocessing steel pipe of 100 tons of above-mentioned specifications of the present embodiment, it is 2.1% that rejection rate is split in quenching, although
Those skilled in the art unanimously think that the strong harden ability steel of 13Cr is unable to water quenching, but preferable water may be implemented using method of the invention
It quenches effect.
Embodiment 2
Within spray Water Quenching carried out to seamless steel pipe 4330VMOD for outer leaching water quenching method, wherein the outer diameter of steel pipe is
200mm, wall thickness 20mm.
The specific method is as follows:
When the complete steel pipe of heating is transported to water quenching system, interior water spray movement, preferential cooling pipe inner wall, by 8s's are opened
After interior spray delay time, steel pipe is immersed outside sink and is soaked with its outer surface (entirely interior work always of spraying water during outer leaching of cooling
Make), surfaces externally and internally cooling (the surfaces externally and internally temperature difference of steel pipe has descended to 30 DEG C or less) simultaneously at this time, after cooling 35 in outer leaching
Spray stops, and the temperature of steel pipe at 130 DEG C hereinafter, realizing the complete transformation of martensite, complete by entire water quenching process at this time.
Using the method coprocessing steel pipe of 100 tons of above-mentioned specifications of the present embodiment, it is 2.0% that rejection rate is split in quenching, although
Those skilled in the art unanimously think that the strong harden ability steel of 4330VMOD is unable to water quenching, but may be implemented preferably using method of the invention
Water quenching effect.
Embodiment 3
Within spray Water Quenching carried out to seamless steel pipe 4145H for outer leaching water quenching method, wherein the outer diameter of steel pipe is 80mm, wall
Thickness is 10mm.
The specific method is as follows:
When the complete steel pipe of heating is transported to water quenching system, interior water spray movement, preferential cooling pipe inner wall, by 4s's are opened
After interior spray delay time, opens external spray and act with cooling pipe outer surface (entirely interior work always of spraying water during outer spray
Make), surfaces externally and internally while cooling (the surfaces externally and internally temperature difference of steel pipe has descended to 30 DEG C or less), outer leaching after cooling 18s at this time
Interior spray stops, and for the temperature of steel pipe at 110 DEG C hereinafter, realizing the complete transformation of martensite, entire water quenching process is complete at this time
At.
Using the method coprocessing steel pipe of 100 tons of above-mentioned specifications of the present embodiment, it is 1.8% that rejection rate is split in quenching.
Comparative example
Within spray Water Quenching carried out to seamless steel pipe 4145H for outer leaching water quenching method, wherein the outer diameter of steel pipe is 80mm, wall
Thickness is 10mm.
The specific method is as follows:
When the complete steel pipe of heating is transported to water quenching system, opens interior water spray movement and simultaneously open outer leaching movement, i.e., simultaneously
The cooling of surfaces externally and internally is carried out, spray stops in outer leaching after cooling 20s, and the temperature of steel pipe is at 110 DEG C hereinafter, realize at this time
The complete transformation of martensite, entire water quenching process are completed.
Using the method coprocessing steel pipe of 100 tons of above-mentioned specifications of comparative example, it is 3.6% that rejection rate is split in quenching.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, the art
Those of ordinary skill, within the essential scope of the present invention, the variations, modifications, additions or substitutions made all should belong to the present invention
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, described in above embodiments and description
Merely illustrate the principles of the invention, without departing from the spirit and scope of the present invention, the present invention also has various change
And improvement, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended
Claims and its equivalent thereof.
Claims (5)
1. a kind of steel pipe process for quenching, which is characterized in that first, in accordance with the interior spray delay time of setting in water quenching system
The inner surface of steel pipe cooled down, it is then cooling to the surfaces externally and internally of steel pipe simultaneously again, to control the interior appearance of the steel pipe
The face temperature difference is not more than 30 DEG C, stops when the temperature of steel pipe is cooled to martensite transformation temperature or less to the surfaces externally and internally of steel pipe
Cooling treatment.
2. a kind of steel pipe process for quenching according to claim 1, which is characterized in that the water quenching system is the outer immersion of interior spray
Or formula water quenching system is drenched outside interior spray.
3. steel pipe process for quenching according to claim 1, which is characterized in that the outer diameter of the steel pipe is 76-273mm, wall
Thickness is 7-80mm.
4. steel pipe process for quenching according to claim 1, which is characterized in that the interior spray delay time set is 1-
40s。
5. steel pipe process for quenching according to claim 1, which is characterized in that the material of the steel pipe be 4330VMOD or
13Cr。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711474051.8A CN109988890A (en) | 2017-12-29 | 2017-12-29 | A kind of steel pipe process for quenching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711474051.8A CN109988890A (en) | 2017-12-29 | 2017-12-29 | A kind of steel pipe process for quenching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109988890A true CN109988890A (en) | 2019-07-09 |
Family
ID=67108680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711474051.8A Pending CN109988890A (en) | 2017-12-29 | 2017-12-29 | A kind of steel pipe process for quenching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109988890A (en) |
-
2017
- 2017-12-29 CN CN201711474051.8A patent/CN109988890A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190709 |