CN110684890A - Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method - Google Patents

Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method Download PDF

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Publication number
CN110684890A
CN110684890A CN201911056525.6A CN201911056525A CN110684890A CN 110684890 A CN110684890 A CN 110684890A CN 201911056525 A CN201911056525 A CN 201911056525A CN 110684890 A CN110684890 A CN 110684890A
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CN
China
Prior art keywords
nozzle
cryogenic
cold roll
forged steel
cryogenic treatment
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CN201911056525.6A
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Chinese (zh)
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CN110684890B (en
Inventor
陈伟
乔建平
丁贵擎
兰勇
罗昌
崔海峰
侯兴慧
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BAOGANG ROLLER TECHNOLOGY Co Ltd
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BAOGANG ROLLER TECHNOLOGY Co Ltd
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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/04Hardening by cooling below 0 degrees Celsius

Abstract

The invention discloses a cryogenic treatment method of a forged steel cold roll and a novel nozzle adopted by the cryogenic treatment method, wherein the nozzle is provided with an installation part and a nozzle head, the nozzle head is provided with 1 large nozzle with the diameter of 0.8-1.2 mm and a plurality of small nozzles with the diameter of 0.4-0.6 mm arranged around the large nozzle, the cryogenic treatment method comprises the steps of ① placing the forged steel cold roll in a cryogenic box, closing the cryogenic box, ② spraying liquid nitrogen into the cryogenic box from the nozzle, reducing the temperature in the cryogenic box to-160-120 ℃ through 1-2 h, ③ preserving the temperature for 2-5 h at the temperature, after ④ preserving the temperature, opening the cryogenic box, placing the forged steel cold roll in a room temperature environment, and naturally recovering to the room temperature.

Description

Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method
Technical Field
The invention belongs to the technical field of cryogenic treatment, and particularly relates to a cryogenic treatment method for a forged steel cold roll and a novel nozzle adopted by the cryogenic treatment method.
Background
The forged steel cold roll is the most important part of a rolling mill in a cold rolling mill, most of the cold roll manufacturing process is subjected to cryogenic treatment, which is an extension of the cold roll heat treatment cooling process, and the cryogenic treatment is to place the cold roll in a specific low-temperature environment to change the microstructure of the cold roll so as to achieve the purpose of improving the comprehensive performance of the cold roll.
At present, the cryogenic treatment of the forged steel cold roll mainly adopts a liquid nitrogen direct spraying mode, and the cryogenic treatment equipment mainly comprises: the system comprises a liquid nitrogen storage tank, a cryogenic tank, a liquid nitrogen spray pipe and nozzle, an ultralow temperature electromagnetic valve and a control system.
At present, the problems of the direct liquid nitrogen spraying cryogenic treatment mode are as follows: the hardness uniformity of the finished product is poor, and the applicant finds that the problem is greatly related to the existing liquid nitrogen nozzle structure through a large amount of research.
As shown in figures 1-2, the conventional liquid nitrogen nozzle structure comprises a mounting part 1 'and a nozzle head 2', wherein the mounting part 1 'comprises a threaded connection part 11' and a hexagon screw rotating part 12 ', only 1 nozzle 21' with the diameter of about 2mm is arranged on the nozzle head 2 ', and a cavity 3' in the nozzle is only about 4 mm. The liquid nitrogen sprayed out by the nozzle is concentrated, the cooling strength is high, the temperature of the local area of the forged steel cold roll is low, so that a soft belt and even cracks are generated, and the nozzle blockage phenomenon is easy to generate.
Chinese patent document CN103468918A discloses a method for spraying liquid nitrogen into a fine mist by installing a mesh at the nozzle of a liquid nitrogen spray pipe, however, this method does not solve the above problems well.
Disclosure of Invention
The invention aims to solve the problems and provides a cryogenic treatment method for a forged steel cold roll, which can effectively improve the hardness uniformity of a forged steel cold roll finished product, and a novel nozzle adopted by the cryogenic treatment method.
The technical scheme for achieving the purpose of the invention is that the cryogenic treatment method of the forged steel cold roll comprises the following steps of ① placing the forged steel cold roll in a cryogenic box, closing the cryogenic box, ② spraying liquid nitrogen into the cryogenic box from a nozzle, reducing the temperature in the cryogenic box to-160 to-120 ℃ through 1-2 hours, ③ preserving heat for 2-5 hours at the temperature of-160 to-120 ℃, opening the cryogenic box after ④ preserving heat, and naturally recovering the forged steel cold roll to the room temperature under the environment of the room temperature (15-25 ℃ and the same below).
The novel nozzle that above-mentioned forged steel cold roll cryogenic treatment method adopted has installation department and nozzle head, the installation department includes threaded connection portion and hex bolts rotating part, it sets up to be equipped with 1 big spout and a plurality of on the nozzle head big spout little spout all around.
The diameter of the large nozzle is 0.8-1.2 mm, and the diameter of the small nozzle is 0.4-0.6 mm.
The cavity inside the nozzle is 5.5-7 mm.
The invention has the following positive effects: by designing a novel nozzle and matching with a corresponding cryogenic treatment method, the sprayed liquid nitrogen can be dispersed and uniform, so that the surface hardness of the forged steel cold roll is uniform, the hardness uniformity of a finished product is greatly improved, and the nozzle blockage phenomenon is also greatly reduced.
Drawings
Fig. 1 is a schematic structural view of a conventional liquid nitrogen nozzle.
Fig. 2 is a right side view of fig. 1.
FIG. 3 is a schematic view of the structure of the liquid nitrogen nozzle of the present invention.
Fig. 4 is a right side view of fig. 3.
FIG. 5 is a graph of the cooling process of the cryogenic treatment of example 1.
Detailed Description
(example 1)
Referring to fig. 3 and 4, the novel nozzle of the present embodiment has a mounting portion 1 and a nozzle head 2, the mounting portion 1 includes a threaded connection portion 11 and a hexagon screw rotating portion 12, a cavity 3 inside the nozzle can reach 6mm, and the nozzle head 2 is provided with 1 large nozzle 21 having a diameter of about 1mm and a plurality of small nozzles 22 having a diameter of about 0.5mm and disposed around the large nozzle 21.
The cryogenic treatment method of the embodiment is as follows:
① the cold roll of forged steel is first placed in the cryogenic box and the cryogenic box is closed.
② controlling the ultralow temperature electromagnetic valve by the control system, spraying liquid nitrogen into the cryogenic box from the liquid nitrogen storage tank through the liquid nitrogen spray pipe and the spray nozzle, and reducing the temperature in the cryogenic box to-140 +/-1 ℃ for 1.5 h;
③ is kept at 140 ℃ below zero plus or minus 1 ℃ for 3.5h, and the temperature in the box is kept unchanged by spraying liquid nitrogen in the cryogenic box during the heat preservation process.
④ after the heat preservation is finished (total 5 h), the cryogenic box is opened, and the forged steel cold roll is placed in the room temperature environment and naturally returns to the room temperature.
The cooling process curve of the cryogenic treatment of the embodiment is shown in figure 5.

Claims (6)

1. A cryogenic treatment method for a forged steel cold roll is characterized by comprising the following steps:
① placing the cold roll of forged steel in a cryogenic box, closing the cryogenic box;
②, spraying liquid nitrogen into the cryogenic box from a nozzle, and reducing the temperature in the cryogenic box to-160 to-120 ℃ after 1-2 hours;
③ is kept at the temperature of-160 to-120 ℃ for 2 to 5 hours;
④ after the heat preservation is finished, opening the cryogenic box, placing the forged steel cold roll in the room temperature environment, and naturally recovering to the room temperature;
in the step ②, the nozzle is provided with an installation part (1) and a nozzle head (2), the installation part (1) comprises a threaded connection part (11) and a hexagon screw rotating part (12), and the nozzle head (2) is provided with 1 large nozzle (21) and a plurality of small nozzles (22) arranged around the large nozzle (21).
2. The cryogenic treatment method for the cold roll of forged steel according to claim 1, characterized by comprising the following steps: the diameter of the large nozzle (21) is 0.8-1.2 mm, and the diameter of the small nozzle (22) is 0.4-0.6 mm.
3. The cryogenic treatment method for the cold roll of forged steel according to claim 1 or 2, characterized by comprising the following steps: the cavity (3) inside the nozzle is 5.5-7 mm.
4. A novel nozzle adopted by the cryogenic treatment method for the forged steel cold roll according to claim 1, which is provided with an installation part (1) and a nozzle head (2), wherein the installation part (1) comprises a threaded connection part (11) and a hexagon screw rotating part (12), and is characterized in that: the nozzle head (2) is provided with 1 large nozzle (21) and a plurality of small nozzles (22) arranged around the large nozzle (21).
5. The novel nozzle of claim 4, wherein: the diameter of the large nozzle (21) is 0.8-1.2 mm, and the diameter of the small nozzle (22) is 0.4-0.6 mm.
6. The novel nozzle of claim 4 or 5, characterized in that: the cavity (3) inside the nozzle is 5.5-7 mm.
CN201911056525.6A 2019-10-31 2019-10-31 Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method Active CN110684890B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911056525.6A CN110684890B (en) 2019-10-31 2019-10-31 Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method

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Application Number Priority Date Filing Date Title
CN201911056525.6A CN110684890B (en) 2019-10-31 2019-10-31 Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method

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CN110684890A true CN110684890A (en) 2020-01-14
CN110684890B CN110684890B (en) 2021-08-03

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Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1174521A (en) * 1995-01-09 1998-02-25 贝特喷雾嘴公司 Improved flat fan spray nozzle
JPH11226459A (en) * 1998-02-12 1999-08-24 Kako Zoki Kk Coating gun
US20060027679A1 (en) * 2004-08-03 2006-02-09 Mr. Jack Gratteau Ejector Nozzle
CN201567350U (en) * 2009-12-07 2010-09-01 昆明理工大学 Atomizing gas quenching device
CN201632338U (en) * 2009-10-15 2010-11-17 川圆科技股份有限公司 Water mist nozzle
CN102286654A (en) * 2010-02-23 2011-12-21 气体产品与化学公司 Method of metal processing using cryogenic cooling
US20120247627A1 (en) * 2011-03-28 2012-10-04 Werner Hendrik Grobler Quenching Process and Apparatus for Practicing Said Process
CN103468918A (en) * 2013-09-29 2013-12-25 宝钢轧辊科技有限责任公司 Subzero treatment method for large-diameter cold rolling work roller and copious cooling box thereof
CN103834780A (en) * 2014-03-10 2014-06-04 宜兴市永昌轧辊有限公司 Horizontal liquid nitrogen direct injection type subzero treatment equipment of steel forging cold roll
CN104032117A (en) * 2014-05-12 2014-09-10 宜兴市永昌轧辊有限公司 Heat treatment method for ultra-high-hardness nonferrous-metal cold roll
CN104775011A (en) * 2015-04-28 2015-07-15 辽宁工业大学 Quick quenching device and method for shaft parts
CN105080740A (en) * 2014-05-14 2015-11-25 湖南科伦制药有限公司 Novel washing bottle shower nozzle
CN105420613A (en) * 2015-12-02 2016-03-23 中钢集团邢台机械轧辊有限公司 Cold rolling roller with high-roughness surface and manufacturing method of cold rolling roller
CN107345730A (en) * 2017-07-21 2017-11-14 中国科学院理化技术研究所 A kind of cryogenic treatment apparatus
CN107429308A (en) * 2015-06-05 2017-12-01 哈利伯顿能源服务公司 The downhole tool axle region of compressive residual stress hardening

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1174521A (en) * 1995-01-09 1998-02-25 贝特喷雾嘴公司 Improved flat fan spray nozzle
JPH11226459A (en) * 1998-02-12 1999-08-24 Kako Zoki Kk Coating gun
US20060027679A1 (en) * 2004-08-03 2006-02-09 Mr. Jack Gratteau Ejector Nozzle
CN201632338U (en) * 2009-10-15 2010-11-17 川圆科技股份有限公司 Water mist nozzle
CN201567350U (en) * 2009-12-07 2010-09-01 昆明理工大学 Atomizing gas quenching device
CN102286654A (en) * 2010-02-23 2011-12-21 气体产品与化学公司 Method of metal processing using cryogenic cooling
US20120247627A1 (en) * 2011-03-28 2012-10-04 Werner Hendrik Grobler Quenching Process and Apparatus for Practicing Said Process
CN103468918A (en) * 2013-09-29 2013-12-25 宝钢轧辊科技有限责任公司 Subzero treatment method for large-diameter cold rolling work roller and copious cooling box thereof
CN103834780A (en) * 2014-03-10 2014-06-04 宜兴市永昌轧辊有限公司 Horizontal liquid nitrogen direct injection type subzero treatment equipment of steel forging cold roll
CN104032117A (en) * 2014-05-12 2014-09-10 宜兴市永昌轧辊有限公司 Heat treatment method for ultra-high-hardness nonferrous-metal cold roll
CN105080740A (en) * 2014-05-14 2015-11-25 湖南科伦制药有限公司 Novel washing bottle shower nozzle
CN104775011A (en) * 2015-04-28 2015-07-15 辽宁工业大学 Quick quenching device and method for shaft parts
CN107429308A (en) * 2015-06-05 2017-12-01 哈利伯顿能源服务公司 The downhole tool axle region of compressive residual stress hardening
CN105420613A (en) * 2015-12-02 2016-03-23 中钢集团邢台机械轧辊有限公司 Cold rolling roller with high-roughness surface and manufacturing method of cold rolling roller
CN107345730A (en) * 2017-07-21 2017-11-14 中国科学院理化技术研究所 A kind of cryogenic treatment apparatus

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