CN112609069A - Controlled cooling method for through type high temperature steel pipe quenching - Google Patents
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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
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- C21D11/005—Process control or regulation for heat treatments for cooling
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- 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
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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
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Abstract
The invention discloses a controlled cooling method for through type high temperature steel pipe quenching, which solves the problems of unsatisfactory cooling rate control and poor circumferential cooling uniformity of the conventional through type quenching device. The V-shaped conveying track (18) for conveying the high-temperature steel pipe (1) sequentially penetrates through the high-temperature section through type cooling unit (2) and the low-temperature section through type cooling unit (3), the left pipe section (4) and the right pipe section (5) are connected into a through linear cylindrical cavity through a middle sleeve (7), a left end sleeve (6) is arranged at the left port of the left pipe section (4), a right end sleeve (8) is arranged at the right port of the right pipe section (5), a forward rotational flow type nozzle (9) is arranged in the inner cavity of the left end sleeve (6), and a reverse rotational flow type nozzle (10) is arranged in the inner cavity of the right end sleeve (8); the device has simple structure and convenient assembly and disassembly.
Description
Technical Field
The invention relates to seamless steel pipe production equipment, in particular to a through type high-temperature steel pipe quenching device capable of effectively regulating and controlling the cooling rate of a quenched steel pipe and a cooling control regulation and control method.
Background
After the seamless steel tube is rolled, quenching and cooling treatment are needed to obtain excellent comprehensive mechanical properties; in the quenching and cooling treatment process, how to effectively, scientifically and reasonably control the cooling rate and the cooling uniformity of the steel pipe is the key point of high-temperature steel pipe quenching, and the process is directly related to the mechanical comprehensive performance of the quenched steel pipe; through preliminary analysis, the main factors influencing the quenching quality of the high-temperature steel pipe comprise: (1) whether the quenching cooling rate of the high-temperature steel pipe can be effectively controlled; the high-temperature steel pipe with the initial temperature of about 950 ℃ can obtain ideal quenched martensite structure in the initial high-temperature section (temperature range 950-; (2) the circumferential cooling uniformity of the steel pipe in the high-temperature steel pipe quenching process; when the circumferential cooling temperature of the steel pipe is not uniform in the quenching process of the high-temperature steel pipe, the nonuniform microstructure is easily caused, and the bending deformation and even cracking of the steel pipe are caused along with the generation of internal stress; (3) the cooling capacity of the cooling device; in the process of quenching and cooling the steel pipe, because the temperature of the surface of the steel pipe is far higher than the temperature of cooling water, the cooling water is sprayed on the outer surface of the steel pipe and then heated and vaporized, a layer of steam film can be formed on the surface of the outer side wall of the high-temperature steel pipe, the outer side wall of the steel pipe is isolated from the cooling water by the steam film, the surface of the steel pipe is converted into film boiling with weak heat exchange capacity from nuclear boiling of strong heat exchange, and the heat exchange efficiency between the steel pipe and the cooling water is greatly reduced. How to efficiently break up the steam film formed on the surface of the outer side wall of the high-temperature steel pipe, avoid the generation of film boiling in quenching, realize comprehensive nucleate boiling, and improve the cooling capacity of cooling equipment is also an important factor for determining the quenching quality of the steel pipe. At present, the common seamless steel pipe units in the field of 'external spraying + internal spray quenching' and 'immersion quenching + internal spray quenching' have the problems of complex equipment structure, large occupied area, high investment cost, large cooling water consumption and poor cooling uniformity of the steel pipe, and are easy to cause bending deformation of the steel pipe; the external spraying type quenching unit sprays pressurized cooling water to the surface of the steel pipe through the nozzle, so that the problems of short contact time of the cooling water and the steel pipe, uneven cooling and insufficient cooling capacity exist, the splashing phenomenon of the cooling water is serious, and water sealing treatment and collection are needed. Meanwhile, the existing quenching cooling device does not effectively control the quenching cooling rate of the high-temperature steel pipe in different temperature sections, so that the quenching quality of the steel pipe cannot be guaranteed, and the mechanical performance of the quenched steel pipe is reduced.
Disclosure of Invention
The invention provides a controlled cooling method for through type high temperature steel pipe quenching, which solves the technical problems of unsatisfactory cooling rate control and poor circumferential cooling uniformity of the conventional through type quenching device.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is as follows: (1) the through type (tunnel type) quenching device is set into a high-temperature section quenching part and a low-temperature section quenching part, so that the high-temperature steel pipe is rapidly cooled when passing through the high-temperature section cooling unit, and is slowly cooled when passing through the low-temperature section cooling unit; (2) the jet mode of cooling water in the through type quenching device is designed into a spiral jet water flow mode, and the diameter of an inscribed circle of the formed spiral jet water flow is smaller than the outer diameter of the high-temperature steel pipe and larger than the inner diameter of the high-temperature steel pipe, so that the boiling area of a strong heat exchange core on the surface of the steel pipe is increased, and the heat exchange efficiency is improved; (3) the structure of the high-temperature section cooling unit is completely the same as that of the low-temperature section cooling unit; the inlet end and the outlet end of the cooling unit are both provided with the spiral-flow type nozzles, so that the rotating direction of spiral jet water flow sprayed by the spiral-flow type nozzles is opposite to the rotating direction of the steel pipe in the cooling unit, and the outer wall of the steel pipe is efficiently and uniformly cooled; (4) the cooling unit middle part is provided with a cooling water collecting port with a downward opening and a water vapor outlet with an upward opening, high-speed water flow ejected towards the middle part in the cooling unit tunnel can form a negative pressure area at the port part of the cooling unit, so that a large amount of air enters the tunnel under the action of pressure, the disorder degree of the cooling water is increased, the heat exchange of the cooling water is accelerated, meanwhile, the problems of outflow and splashing of the cooling water at the port of the cooling unit are also avoided, and a water sealing and recycling device is not required to be additionally arranged at the port part of the cooling unit.
A through type high-temperature steel pipe quenching device capable of effectively controlling cooling comprises a V-shaped conveying roller way, wherein a high-temperature steel pipe is conveyed on the V-shaped conveying roller way, the V-shaped conveying roller way for conveying the high-temperature steel pipe sequentially penetrates through a high-temperature section through type cooling unit and a low-temperature section through type cooling unit, and the mechanical structure of the high-temperature section through type cooling unit is completely the same as that of the low-temperature section through type cooling unit; the high-temperature section through type cooling unit consists of a left pipe section, a right pipe section, a left sleeve, a middle sleeve and a right sleeve, wherein the left pipe section and the right pipe section are connected into a through cylindrical cavity through the middle sleeve; the left end sleeve is provided with a left pipe section cooling water inlet, and the right end sleeve is provided with a right pipe section cooling water inlet.
The forward rotational flow type nozzle is sprayed with forward rotational flow water flow which is rotationally sprayed towards the middle sleeve in the left pipe section; the reverse rotational flow type nozzle is sprayed with reverse rotational flow water which is rotationally sprayed to the middle sleeve in the right pipe section; a drainage water flow is formed above the drainage port.
A controlled cooling method for through type high temperature steel pipe quenching is characterized by comprising the following steps:
after the head of the self-rotating high-temperature steel pipe conveyed by the V-shaped conveying roller way enters the high-temperature section through type cooling unit, a forward rotational flow type nozzle on a sleeve at the left end of the high-temperature section through type cooling unit sprays forward rotational flow water flow to the high-temperature steel pipe, the spiral advancing direction of the forward rotational flow water flow is the same as that of the high-temperature steel pipe, and the spiral rotating direction of the forward rotational flow water flow is opposite to that of the high-temperature steel pipe; the diameter of an inscribed circle of the spiral jet water flow formed by the forward rotational flow water flow is smaller than the outer diameter of the high-temperature steel pipe and larger than the inner diameter of the high-temperature steel pipe;
after the head of the high-temperature steel pipe passes through the middle sleeve of the high-temperature section through type cooling unit, a reverse rotational flow type nozzle is arranged on a sleeve at the right end of the high-temperature section through type cooling unit, and sprays reverse rotational flow water flow to the high-temperature steel pipe, wherein the spiral advancing direction of the reverse rotational flow water flow is opposite to the spiral advancing direction of the high-temperature steel pipe, and the spiral rotating direction of the reverse rotational flow water flow is opposite to the self-rotating direction of the high-temperature steel pipe; the diameter of an inscribed circle of the spiral jet water flow formed by the reverse rotational flow water flow is smaller than the outer diameter of the high-temperature steel pipe and larger than the inner diameter of the high-temperature steel pipe;
respectively setting the water pressure of cooling water entering the forward vortex nozzle through a cooling water inlet of the left pipe section of the high-temperature section passing type cooling unit, and the water pressure of cooling water entering the reverse vortex nozzle through a cooling water inlet of the right pipe section of the high-temperature section passing type cooling unit, so that the temperature of the pipe wall of the high-temperature steel pipe quenched and cooled by the high-temperature section passing type cooling unit is reduced from 1000 ℃ to 500 ℃ at 400 ℃ at the temperature of the high-temperature steel pipe wall, and the cooling rate of the temperature of the pipe wall of the high-temperature steel pipe is greater than 50 ℃/per second;
respectively setting the water pressure of cooling water entering the forward vortex nozzle through a cooling water inlet of the left pipe section of the low-temperature section pass-type cooling unit, and the water pressure of cooling water entering the reverse vortex nozzle through a cooling water inlet of the right pipe section of the low-temperature section pass-type cooling unit, so that the temperature of the pipe wall of the high-temperature steel pipe passing through the low-temperature section pass-type cooling unit is reduced from 500 ℃ at 400 ℃ to 200 ℃ at 100 ℃ at 200 ℃, and the cooling rate of the pipe wall temperature of the high-temperature steel pipe is smaller than 25 ℃/per second;
and (IV) a spacing distance is reserved between the high-temperature section pass cooling unit and the low-temperature section pass cooling unit, the high-temperature steel pipe is conveyed out of the high-temperature section pass cooling unit and enters the low-temperature section pass cooling unit, and the high-temperature steel pipe is in an air cooling state in the process.
The high-temperature section through type cooling unit and the low-temperature section through type cooling unit are both installed on the lifting base so as to meet the requirement on quenching treatment adjustment of high-temperature steel pipes with different diameters, and the central axis of the high-temperature steel pipe is coincided with the central axes of the high-temperature section through type cooling unit and the low-temperature section through type cooling unit through adjustment of the lifting base, so that the cooling uniformity of the high-temperature steel pipes is ensured.
The quenching and cold control of the high-temperature steel pipe are realized by regulating the speed of the V-shaped conveying roller way for conveying the high-temperature steel pipe and respectively controlling the water pressure of quenching cooling water entering the high-temperature section through type cooling unit and the water pressure of quenching cooling water entering the low-temperature section through type cooling unit.
The invention adopts a sectional quenching cold control mode of fast cooling at a high-temperature section and slow cooling at a low-temperature section for the high-temperature steel pipe, and can change the heat exchange capacity of cooling water and the surface of the steel pipe by adjusting the advancing speed of the steel pipe, the pressure of the cooling water, the water flow and the number of cooling units, thereby realizing the control of the cooling speed in the cooling process of the steel pipe, achieving the control of the phase change and the tissue form involved in the cooling process of the steel pipe and realizing the flexible regulation and control of the cooling process of the steel pipe; the spiral high-pressure cooling water sprayed from the spiral-flow type nozzle generates a spiral-flow effect in the cooling sleeve, the turbulence degree of water flow is enhanced, a steam film on the surface of the steel pipe is broken, heat exchange between the steel pipe and the cooling water is greatly improved, the high cooling speed and the cooling uniformity of the steel pipe are realized, and bending deformation and even cracking of the steel pipe caused by uneven cooling are inhibited. According to the invention, through the high-temperature steel pipe red-returning stage, the uniformity of the temperature in the wall thickness direction of the inner and outer steel pipes is realized, the uniformity of the structure performance of the steel pipe after heat treatment is improved, and the difference of the inner and outer performance of the pipe wall is reduced. The invention realizes the high-efficiency recovery of cooling water without sealing water positions, avoids the outflow and splashing of the cooling water at the inlet and the outlet ends of the cooler steel pipe, is beneficial to the high-efficiency recovery of the cooling water, and does not need sealing water treatment at the port; the invention has the advantages of simple equipment structure, convenient assembly and disassembly, small occupied area, low investment cost, small cooling water consumption, easy recovery and energy conservation and environmental protection.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the high-temperature zone pass cooling unit 2 of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a through type high-temperature steel pipe quenching device capable of effectively controlling cooling comprises a V-shaped conveying roller way 18, wherein a high-temperature steel pipe 1 is conveyed on the V-shaped conveying roller way 18, the V-shaped conveying roller way 18 conveying the high-temperature steel pipe 1 sequentially penetrates through a high-temperature section through type cooling unit 2 and a low-temperature section through type cooling unit 3, and the mechanical structure of the high-temperature section through type cooling unit 2 is completely the same as that of the low-temperature section through type cooling unit 3; the high-temperature section through type cooling unit 2 is composed of a left pipe section 4, a right pipe section 5, a left sleeve 6, a middle sleeve 7 and a right sleeve 8, wherein the left pipe section 4 and the right pipe section 5 are connected into a through cylindrical cavity through the middle sleeve 7, the left end sleeve 6 is arranged on the left port of the left pipe section 4, the right sleeve 8 is arranged on the right port of the right pipe section 5, a forward vortex nozzle 9 is arranged in the inner cavity of the left sleeve 6, a reverse vortex nozzle 10 is arranged in the inner cavity of the right sleeve 8, and a water outlet 14 and a steam outlet 15 are respectively arranged on the middle sleeve 7; a left pipe section cooling water inlet 16 is arranged on the left end sleeve 6, and a right pipe section cooling water inlet 17 is arranged on the right end sleeve 8.
The forward rotational flow type nozzle 9 is sprayed with forward rotational flow water flow 11, and the forward rotational flow water flow 11 is rotationally sprayed towards the middle sleeve 7 in the left pipe section 4; a reverse rotational flow water flow 12 is sprayed on the reverse rotational flow type nozzle 10, and the reverse rotational flow water flow 12 is rotationally sprayed in the right pipe section 5 towards the middle sleeve 7; a drainage water flow 13 is formed above the drainage port 14.
A controlled cooling method for through type high temperature steel pipe quenching comprises the steps that a V-shaped conveying roller way 18 for conveying a high temperature steel pipe 1 sequentially penetrates through a high temperature section through type cooling unit 2 and a low temperature section through type cooling unit 3, and the mechanical structure of the high temperature section through type cooling unit 2 is completely the same as that of the low temperature section through type cooling unit 3; the high-temperature section through type cooling unit 2 consists of a left pipe section 4, a right pipe section 5, a left sleeve 6, a middle sleeve 7 and a right sleeve 8, wherein the left pipe section 4 and the right pipe section 5 are connected into a through cylindrical cavity through the middle sleeve 7, the left end sleeve 6 is arranged on the left port of the left pipe section 4, the right end sleeve 8 is arranged on the right port of the right pipe section 5, a forward spiral-flow type nozzle 9 is arranged in the inner cavity of the left sleeve 6, a reverse spiral-flow type nozzle 10 is arranged in the inner cavity of the right sleeve 8, and a water outlet 14 and a steam outlet 15 are respectively arranged on the middle sleeve 7; a left pipe section cooling water inlet 16 is arranged on the left end sleeve 6, and a right pipe section cooling water inlet 17 is arranged on the right end sleeve 8; the method is characterized by comprising the following steps:
after the head of the self-rotating high-temperature steel pipe 1 conveyed by the V-shaped conveying roller way 18 enters the high-temperature section through type cooling unit 2, a forward rotational flow type nozzle 9 on a left end sleeve 6 of the high-temperature section through type cooling unit 2 sprays forward rotational flow water flow 11 to the high-temperature steel pipe 1, the spiral advancing direction of the forward rotational flow water flow 11 is the same as that of the high-temperature steel pipe 1, and the spiral rotating direction of the forward rotational flow water flow 11 is opposite to that of the self-rotating high-temperature steel pipe 1; the diameter of an inscribed circle of the spiral jet water flow formed by the forward rotational flow water flow 11 is smaller than the outer diameter of the high-temperature steel pipe 1 and larger than the inner diameter of the high-temperature steel pipe 1;
after the head of the high-temperature steel pipe 1 passes through a middle sleeve 7 of the high-temperature section through type cooling unit 2, a reverse rotational flow type nozzle 10 on a right sleeve 8 of the high-temperature section through type cooling unit 2 sprays reverse rotational flow water flow 12 to the high-temperature steel pipe 1, the spiral advancing direction of the reverse rotational flow water flow 12 is opposite to the spiral advancing direction of the high-temperature steel pipe 1, and the spiral rotating direction of the reverse rotational flow water flow 12 is opposite to the self-rotating direction of the high-temperature steel pipe 1; the diameter of an inscribed circle of the spiral jet water flow formed by the reverse rotational flow water flow 12 is smaller than the outer diameter of the high-temperature steel pipe 1 and larger than the inner diameter of the high-temperature steel pipe 1;
respectively setting the water pressure of the cooling water entering the forward vortex nozzle 9 through the cooling water inlet 16 of the left pipe section of the high-temperature section passing type cooling unit 2, and the water pressure of the cooling water entering the reverse vortex nozzle 10 through the cooling water inlet 17 of the right pipe section of the high-temperature section passing type cooling unit 2, so that the pipe wall temperature of the high-temperature steel pipe 1 quenched and cooled by the high-temperature section passing type cooling unit 2 is reduced from 1000 ℃ to 500 ℃ at 400 ℃ and the pipe wall temperature cooling rate of the high-temperature steel pipe 1 is greater than 50 ℃/per second;
respectively setting the water pressure of cooling water entering the forward vortex nozzle through the cooling water inlet of the left pipe section of the low-temperature section pass-type cooling unit 3, and the water pressure of cooling water entering the reverse vortex nozzle through the cooling water inlet of the right pipe section of the low-temperature section pass-type cooling unit 3, so that the temperature of the pipe wall of the high-temperature steel pipe 1 passing through the low-temperature section pass-type cooling unit 3 is reduced to 200 ℃ from 500 ℃ of 400 ℃ of plus materials, and the cooling speed of the pipe wall temperature of the high-temperature steel pipe 1 is smaller than 25 ℃/per second;
(IV), there is certain spacing distance between high temperature section through cooling unit 2 and the low temperature section through cooling unit 3, high temperature steel pipe 1 is in the air cooling state after being conveyed out from high temperature section through cooling unit 2, before entering low temperature section through cooling unit 3, this in-process high temperature steel pipe 1 is in the air cooling state, the steel pipe returns red at this in-process promptly, it is red in-process to return red the stage and has reduced high temperature steel pipe because high temperature steel pipe outer wall cooling rate is far more than inner wall cooling rate and cause the great difference in temperature of high temperature steel pipe inside and outside wall in the high temperature section quenching cooling process, realize the homogeneity of inside and outside steel pipe wall thickness direction temperature, and then improved the homogeneity of steel pipe heat treatment back microstructure, reduce the difference of the inside and outside performance.
The high-temperature section through type cooling unit 2 and the low-temperature section through type cooling unit 3 are both installed on a lifting base to meet the quenching treatment adjustment requirements of high-temperature steel pipes 1 with different diameters and specifications, and the central axes of the high-temperature steel pipes coincide with the central axes of the high-temperature section through type cooling unit 2 and the low-temperature section through type cooling unit 3 through adjustment of the lifting base, so that the cooling uniformity of the high-temperature steel pipes 1 is ensured.
The quenching and cold control of the high-temperature steel pipe 1 is realized by regulating the speed of the V-shaped conveying roller way 18 for conveying the high-temperature steel pipe 1 and respectively controlling the water pressure of the quenching cooling water entering the high-temperature section through type cooling unit 2 and the water pressure of the quenching cooling water entering the low-temperature section through type cooling unit 3.
Claims (3)
1. A controlled cooling method for through type high temperature steel pipe quenching comprises the steps that a V-shaped conveying roller way (18) for conveying a high temperature steel pipe (1) sequentially penetrates through a high temperature section through type cooling unit (2) and a low temperature section through type cooling unit (3), and the mechanical structure of the high temperature section through type cooling unit (2) is completely the same as that of the low temperature section through type cooling unit (3); the high-temperature section through type cooling unit (2) is composed of a left side pipe section (4), a right side pipe section (5), a left end sleeve (6), a middle sleeve (7) and a right end sleeve (8), the left side pipe section (4) and the right side pipe section (5) are connected into a through cylindrical cavity through the middle sleeve (7), the left end sleeve (6) is arranged on the left port of the left side pipe section (4), the right end sleeve (8) is arranged on the right port of the right side pipe section (5), a forward rotational flow type nozzle (9) is arranged in the inner cavity of the left end sleeve (6), a reverse rotational flow type nozzle (10) is arranged in the inner cavity of the right end sleeve (8), and a water outlet (14) and a steam outlet (15) are respectively arranged on the middle sleeve (7); a left pipe section cooling water inlet (16) is arranged on the left end sleeve (6), and a right pipe section cooling water inlet (17) is arranged on the right end sleeve (8); the method is characterized by comprising the following steps:
after the head of a self-rotating high-temperature steel pipe (1) conveyed by a V-shaped conveying roller way (18) enters a high-temperature section through type cooling unit (2), a forward rotational flow type nozzle (9) on a left end sleeve (6) of the high-temperature section through type cooling unit (2) sprays forward rotational flow water flow (11) to the high-temperature steel pipe (1), the spiral advancing direction of the forward rotational flow water flow (11) is the same as that of the high-temperature steel pipe (1), and the spiral rotating direction of the forward rotational flow water flow (11) is opposite to that of the high-temperature steel pipe (1); the diameter of an inscribed circle of a spiral jet water flow formed by the forward rotational flow water flow (11) is smaller than the outer diameter of the high-temperature steel pipe (1) and larger than the inner diameter of the high-temperature steel pipe (1);
after the head of the high-temperature steel pipe (1) passes through a middle sleeve (7) of the high-temperature section through type cooling unit (2), a reverse rotational flow type nozzle (10) is arranged on a right end sleeve (8) of the high-temperature section through type cooling unit (2) to spray reverse rotational flow water flow (12) to the high-temperature steel pipe (1), the spiral advancing direction of the reverse rotational flow water flow (12) is opposite to the spiral advancing direction of the high-temperature steel pipe (1), and the spiral rotating direction of the reverse rotational flow water flow (12) is opposite to the self-rotating direction of the high-temperature steel pipe (1); the diameter of an inscribed circle of the spiral jet water flow formed by the reverse rotational flow water flow (12) is smaller than the outer diameter of the high-temperature steel pipe (1) and larger than the inner diameter of the high-temperature steel pipe (1);
respectively setting the water pressure of cooling water entering the forward vortex nozzle (9) through the cooling water inlet (16) of the left pipe section of the high-temperature section passing type cooling unit (2), and the water pressure of cooling water entering the reverse vortex nozzle (10) through the cooling water inlet (17) of the right pipe section of the high-temperature section passing type cooling unit (2), so that the temperature of the pipe wall of the high-temperature steel pipe (1) quenched and cooled by the high-temperature section passing type cooling unit (2) is reduced from 1000 ℃ to 500 ℃ in 400 ℃, and the cooling rate of the temperature of the pipe wall of the high-temperature steel pipe (1) is greater than 50 ℃/per second;
respectively setting the water pressure of cooling water entering the forward vortex nozzle through a cooling water inlet of the left pipe section of the low-temperature section pass-type cooling unit (3), and the water pressure of cooling water entering the reverse vortex nozzle through a cooling water inlet of the right pipe section of the low-temperature section pass-type cooling unit (3), so that the temperature of the pipe wall of the high-temperature steel pipe (1) passing through the low-temperature section pass-type cooling unit (3) is reduced from 500 ℃ of 400-;
and (IV) a spacing distance is reserved between the high-temperature section passing type cooling unit (2) and the low-temperature section passing type cooling unit (3), after the high-temperature steel pipe (1) is conveyed out of the high-temperature section passing type cooling unit (2), the high-temperature steel pipe enters the low-temperature section passing type cooling unit (3), and the high-temperature steel pipe (1) is in an air cooling state in the process.
2. The controlled cooling method for through type high temperature steel pipe quenching according to claim 1, characterized in that the high temperature section through type cooling unit (2) and the low temperature section through type cooling unit (3) are both mounted on a liftable base to meet the quenching treatment adjustment requirements of high temperature steel pipes (1) with different diameters, and the central axis of the high temperature steel pipe is coincided with the central axes of the high temperature section through type cooling unit (2) and the low temperature section through type cooling unit (3) through adjustment of the liftable base, so that the cooling uniformity of the high temperature steel pipe (1) is ensured.
3. The controlled cooling method for through type high temperature steel pipe quenching according to claim 1, characterized in that the quenching cooling control of the high temperature steel pipe (1) is realized by controlling the speed of the V-shaped conveying roller way (18) for conveying the high temperature steel pipe (1) and respectively controlling the water pressure of the quenching cooling water entering the high temperature section through type cooling unit (2) and the water pressure of the quenching cooling water of the low temperature section through type cooling unit (3).
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