CN111020161A - Quenching treatment method of seamless stainless steel tube for fluid - Google Patents
Quenching treatment method of seamless stainless steel tube for fluid Download PDFInfo
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- CN111020161A CN111020161A CN201911420451.XA CN201911420451A CN111020161A CN 111020161 A CN111020161 A CN 111020161A CN 201911420451 A CN201911420451 A CN 201911420451A CN 111020161 A CN111020161 A CN 111020161A
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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
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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
- 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
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a quenching treatment method of a seamless stainless steel pipe for fluid, belonging to the technical field of steel pipe quenching. The method comprises the steps of immersing the bottom of the steel pipe heated to the temperature above the austenite temperature in a quenching medium, rotating the steel pipe simultaneously, and spraying the outside of the steel pipe until the temperature of the steel pipe is reduced to the temperature below the martensite transformation temperature. Compared with the existing quenching treatment method of external spraying and internal spraying or external soaking and internal spraying, the method has the advantages that the quenching cooling speed is high, the cooling is uniform, the cost is low, the quenching cracking phenomenon can be effectively reduced, the surface quality of the stainless steel pipe is improved, and the cracking rejection rate of the seamless stainless steel pipe is reduced by adopting a mode of bottom immersion and rotary external spraying.
Description
Technical Field
The invention belongs to the technical field of steel pipe quenching, and particularly relates to a quenching treatment method of a seamless stainless steel pipe for fluid.
Background
The quenching can improve the hardness and the wear resistance of the metal workpiece, and the cooling as a key link of the quenching treatment has important influence on the production efficiency, the final product quality and the economic benefit of the steel pipe heat treatment. In various quenching technologies of the steel pipe, water is used as a quenching medium, so that the environmental pollution can be reduced, the cost of the steel pipe can be reduced, and the performance of the pipe can be improved. When the steel pipe is quenched, water on the surface of the steel pipe is heated and vaporized to isolate the steel pipe from the water, and the steam film is a poor conductor of heat, so that the cooling rate of the steel pipe is reduced. The cooling speed of the steel pipe during quenching exceeds the critical cooling speed, so that the required martensite structure can be obtained, and therefore, the steam film generated on the surface of the steel pipe during quenching needs to be continuously scattered in the quenching process, the surface heat exchange condition of the steel pipe is improved, the cooling speed of the steel pipe is increased, and the quenched martensite structure is ensured to be obtained.
At present, water quenching commonly used at home and abroad mainly comprises four modes of dipping, dipping and internal axial spraying (namely, an internal spraying and external dipping mode), external surface laminar spraying and external surface laminar cooling and internal axial spraying (namely, an internal spraying and external spraying mode), wherein the internal spraying and external dipping mode and the internal spraying and external spraying mode have better cooling effects and wider application range. In the aspect of improvement of water quenching technology, the improvement of water quenching equipment is more directed at the present, for example, in the design and application of seamless steel pipe water quenching equipment (xu hong, yan li kun, zu jia le, metallurgical equipment, 2010 year 02) in the literature, an advanced external spraying, rotating and internal spraying quenching process is adopted at home and abroad, a great amount of structural transformation and technical innovation are carried out on the water quenching equipment, the precision and mechanical properties of a steel pipe are effectively improved, and the defects of quenching cracks, bending, ovality and the like are greatly reduced. However, the two processes are more suitable for quenching the steel pipe with thicker wall thickness, the corresponding quenching devices have larger equipment, large occupied area and higher requirements on the heating furnace, and the two quenching devices have low investment return rate aiming at the thin-wall steel pipe.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the technical problems, the invention provides a quenching treatment method of a seamless stainless steel pipe for fluid, which has the advantages of high quenching cooling speed, uniform cooling and low cost, can effectively reduce the quenching cracking phenomenon and improve the surface quality of the stainless steel pipe.
The technical scheme is as follows: a method for quenching seamless stainless steel tube for fluid includes immersing the bottom of steel tube heated to austenite temp or higher in quenching medium, rotating the steel tube, and spraying the liquid outside until the temp of steel tube is lower than the martensite transformation temp.
Preferably, the quenching medium is water or oil.
Preferably, the wall thickness of the steel pipe is not more than 10 mm.
Preferably, the steel pipe is moved in a downward inclination of 5 to 10 ° in the direction of the heated outlet.
Preferably, the quenching medium is arranged in a quenching tank, the side wall of the quenching tank is provided with overflow holes parallel to the moving direction of the steel pipe, the top of the quenching tank is provided with a plurality of groups of annular spray pipes at intervals, and the spray pipes are provided with nozzles.
Preferably, an overflow tank is arranged at the bottom of the quenching tank.
Preferably, the spray pipe is connected with a high-pressure water supply pipe, and a water supply pump driven by a variable frequency motor is arranged on the high-pressure water supply pipe.
Has the advantages that: the invention improves the quenching method aiming at the seamless stainless steel pipe for the fluid, and compared with the existing quenching treatment method of external spraying and internal spraying or external soaking and internal spraying, the invention realizes rapid and uniform cooling and reduces the quenching cost by a mode of bottom immersion and rotary external spraying. The quenching crack rejection rate of the seamless stainless steel pipe subjected to quenching treatment is greatly reduced to be within 2 percent.
Through proper quenching medium selection, the cooling effect of the invention is particularly remarkable for stainless steel pipes with thin wall thickness.
The steel pipe is slightly inclined downwards, so that the quenching medium can be effectively prevented from flowing back to the quenching heating furnace.
The overflow holes on the quenching tank and the overflow tank at the bottom can control the water level of the immersed steel pipe and realize the retreatment and the cyclic utilization of the spraying sewage.
Water spray pressure can be adjusted to different positions of steel pipe through inverter motor drive working shaft, realizes even cooling.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A seamless stainless steel pipe for fluid use, which is made of Cr13 and has an outer diameter of 102mm and a wall thickness of 6.5mm, is quenched by the following method: and immersing the bottom of the steel pipe heated to the temperature above the austenite temperature in water, inclining downwards by 5 degrees along the heated outlet direction, moving in the quenching tank, rotating the steel pipe, spraying the outside of the steel pipe, and overflowing water flow to an overflow pool at the bottom of the quenching tank through overflow holes in the side wall of the quenching tank until the temperature of the steel pipe is reduced to the temperature below the martensite transformation temperature.
Wherein, the spraying to the steel pipe outside is carried out through the nozzle that can adjust water pressure and direction. The nozzles are arranged on 7 groups of annular spray pipes arranged at intervals at the top of the quenching tank, and the intervals of the spray pipes are from dense to sparse along the moving direction of the steel pipe. The spray pipe is connected with a high-pressure water supply pipe, and a water supply pump driven by a variable frequency motor is arranged on the high-pressure water supply pipe, so that the water pressure is adjusted from high to low along the moving direction of the steel pipe.
100 groups of steel pipes with the specifications are treated by adopting the embodiment of the method, and the quench cracking rejection rate after quenching is 1.3 percent.
Example 2
A seamless stainless steel pipe for fluid use, which is ZG35 in material quality, has an outer diameter of 63.5mm and a wall thickness of 4mm, is quenched by the following method: and immersing the bottom of the steel pipe heated to the temperature above the austenite temperature in water, inclining downwards by 7 degrees along the heated outlet direction, moving in the quenching tank, rotating the steel pipe, spraying the outside of the steel pipe, and overflowing water flow to an overflow pool at the bottom of the quenching tank through overflow holes in the side wall of the quenching tank until the temperature of the steel pipe is reduced to the temperature below the martensite transformation temperature.
Wherein, the spraying to the steel pipe outside is carried out through the nozzle that can adjust water pressure and direction. The nozzles are arranged on 7 groups of annular spray pipes arranged at intervals at the top of the quenching tank, and the intervals of the spray pipes are from dense to sparse along the moving direction of the steel pipe. The spray pipe is connected with a high-pressure water supply pipe, and a water supply pump driven by a variable frequency motor is arranged on the high-pressure water supply pipe, so that the water pressure is adjusted from high to low along the moving direction of the steel pipe.
100 groups of steel pipes with the specifications are treated by adopting the embodiment of the method, and the quench cracking rejection rate after quenching is 1.0 percent.
Example 3
A fluid seamless stainless steel pipe which is made of 30Mn, has an outer diameter of 180mm and a wall thickness of 10mm is taken for quenching treatment, and the method comprises the following steps: and immersing the bottom of the steel pipe heated to the temperature above the austenite temperature in water, inclining downwards by 6 degrees along the heated outlet direction, moving in the quenching tank, rotating the steel pipe, spraying the outside of the steel pipe, and overflowing water flow to an overflow pool at the bottom of the quenching tank through overflow holes in the side wall of the quenching tank until the temperature of the steel pipe is reduced to the temperature below the martensite transformation temperature.
Wherein, the spraying to the steel pipe outside is carried out through the nozzle that can adjust water pressure and direction. The nozzles are arranged on 7 groups of annular spray pipes arranged at intervals at the top of the quenching tank, and the intervals of the spray pipes are from dense to sparse along the moving direction of the steel pipe. The spray pipe is connected with a high-pressure water supply pipe, and a water supply pump driven by a variable frequency motor is arranged on the high-pressure water supply pipe, so that the water pressure is adjusted from high to low along the moving direction of the steel pipe.
100 groups of steel pipes with the specifications are treated by adopting the embodiment of the method, and the quench cracking rejection rate after quenching is 1.6%.
The results of comparing the examples of the present invention with the prior art are shown in table 1:
TABLE 1
| Example 1 | Example 2 | Example 3 | Prior Art | |
| Rate of quench cracking rejects | 1.3% | 1.0% | 1.6% | 10% |
| Degree of curvature per meter | 0.5mm/m | 0.3 mm/m | 0.7 mm/m | 1.5 mm/m |
The above examples are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A method for quenching seamless stainless steel tube for fluid, which is characterized in that the bottom of the steel tube heated to above the austenite temperature is immersed in a quenching medium, the steel tube is rotated at the same time, and the exterior of the steel tube is sprayed until the temperature of the steel tube is reduced to below the martensite transformation temperature.
2. The quenching treatment method of the seamless stainless steel pipe for fluid according to claim 1, wherein the quenching medium is water or oil.
3. The quenching treatment method of a seamless stainless steel pipe for fluids according to claim 1, wherein the wall thickness of the steel pipe is not more than 10 mm.
4. The quenching treatment method of a seamless stainless steel pipe for fluids according to claim 1, wherein the steel pipe is moved in a downward inclination of 5 to 10 ° in the heated outlet direction.
5. The quenching treatment method of the seamless stainless steel tube for fluid according to claim 1, wherein the quenching medium is arranged in a quenching tank, the side wall of the quenching tank is provided with overflow holes parallel to the moving direction of the steel tube, the top of the quenching tank is provided with a plurality of groups of annular spray pipes at intervals, and the spray pipes are provided with nozzles.
6. The quenching treatment method of seamless stainless steel pipe for fluid according to claim 5, wherein an overflow tank is provided at the bottom of the quenching tank.
7. The quenching treatment method of seamless stainless steel pipe for fluid according to claim 5, wherein the shower pipe is connected to a high pressure water supply pipe, and the high pressure water supply pipe is provided with a water supply pump driven by a variable frequency motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911420451.XA CN111020161A (en) | 2019-12-31 | 2019-12-31 | Quenching treatment method of seamless stainless steel tube for fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911420451.XA CN111020161A (en) | 2019-12-31 | 2019-12-31 | Quenching treatment method of seamless stainless steel tube for fluid |
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| CN111020161A true CN111020161A (en) | 2020-04-17 |
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| CN201911420451.XA Pending CN111020161A (en) | 2019-12-31 | 2019-12-31 | Quenching treatment method of seamless stainless steel tube for fluid |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177644A (en) * | 1996-06-05 | 1998-04-01 | 住友金属工业株式会社 | Method for cooling steel pipe |
| CN101109039A (en) * | 2007-08-31 | 2008-01-23 | 西安重型机械研究所 | Rotation lifting mechanism in steel tube guenching device and steel tube transformation hardening method thereof |
| CN101423887A (en) * | 2008-12-02 | 2009-05-06 | 攀钢集团成都钢铁有限责任公司 | Method for cooling steel pipe |
| 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 |
| CN201276583Y (en) * | 2008-09-29 | 2009-07-22 | 衡阳华菱连轧管有限公司 | Apparatus for quenching steel pipe by external showering, internal spraying and dipping bath |
| CN101942554A (en) * | 2010-07-27 | 2011-01-12 | 湖北新冶钢有限公司 | Technology for heating processing and quenching of thick-wall seamless steel tube |
-
2019
- 2019-12-31 CN CN201911420451.XA patent/CN111020161A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177644A (en) * | 1996-06-05 | 1998-04-01 | 住友金属工业株式会社 | Method for cooling steel pipe |
| CN101109039A (en) * | 2007-08-31 | 2008-01-23 | 西安重型机械研究所 | Rotation lifting mechanism in steel tube guenching device and steel tube transformation hardening method thereof |
| 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 |
| CN201276583Y (en) * | 2008-09-29 | 2009-07-22 | 衡阳华菱连轧管有限公司 | Apparatus for quenching steel pipe by external showering, internal spraying and dipping bath |
| CN101423887A (en) * | 2008-12-02 | 2009-05-06 | 攀钢集团成都钢铁有限责任公司 | Method for cooling steel pipe |
| CN101942554A (en) * | 2010-07-27 | 2011-01-12 | 湖北新冶钢有限公司 | Technology for heating processing and quenching of thick-wall seamless steel tube |
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Application publication date: 20200417 |