CN112916645A - High-strength steel pipe machining process - Google Patents
High-strength steel pipe machining process Download PDFInfo
- Publication number
- CN112916645A CN112916645A CN201911242668.6A CN201911242668A CN112916645A CN 112916645 A CN112916645 A CN 112916645A CN 201911242668 A CN201911242668 A CN 201911242668A CN 112916645 A CN112916645 A CN 112916645A
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- Prior art keywords
- steel pipe
- work
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- heating
- temperature
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Abstract
The invention provides a processing technology of a high-strength steel pipe, which comprises the following steps: the method comprises the steps of firstly cleaning and inspecting blanks, preheating the blanks which are qualified in inspection and have no quality problem, aligning after heating, performing truncation work, heating the processed blanks, performing thermal centering work after heating, performing perforation work after thermal centering is finished, performing hot rolling work after perforation is finished, cutting off the head and the tail of a steel pipe after the hot rolling work is finished, heating the steel pipe with the head and the tail cut off, descaling with high-pressure water after heating is finished, performing tension reducing work after descaling is finished, performing carburizing and quenching after the tension reducing work is finished, performing air cooling after the carburizing and quenching is finished, cutting off the head and the tail of the steel pipe after cooling is finished, straightening the steel pipe after the cutting-off work is finished, performing flaw detection work after the steel pipe is straightened, and performing surface treatment work on qualified products. The invention has the beneficial effect of improving the strength of the steel pipe.
Description
Technical Field
The invention belongs to the field of steel pipes, and particularly relates to a high-strength steel pipe machining process.
Background
Along with the development of the existing science and technology, the types and the strength of steel pipes are also enhanced, the seamless steel pipes and the welded steel pipes need to be improved in strength, a large amount of requirements are provided for the yield of the steel pipes, but the existing technological method cannot ensure the rapid production of the high-strength steel pipes, for example, the traditional seamless steel pipes adopt a cold rolling process, although the yield can be improved, a large amount of materials and energy can be wasted by the pickling, phosphating and saponification processes performed in the later stage, meanwhile, the hot rolling process can cause the layering phenomenon, the performance is reduced, meanwhile, the residual stress can be generated due to the uneven cooling, the control on the processing precision is also reduced, the strength can be difficult to control, and the strength requirement required by the steel pipe forming is influenced.
Disclosure of Invention
The invention aims to provide a high-strength steel pipe machining process which is capable of increasing strength and machining speed and is particularly suitable for high-strength steel pipe production.
The technical scheme of the invention is as follows: a high-strength steel pipe machining process comprises the following steps: firstly, cleaning and inspecting blanks, preheating the blanks which are qualified and have no quality problem, controlling preheating temperature at 200-, and carrying out flaw detection after the steel pipe is straightened, and carrying out surface treatment on qualified products.
Further, the floating range of the preheating temperature is not more than 50 ℃.
Further, the temperature floating range in the blank heating process is not more than 30 ℃, and the temperature after floating is not more than 1300 ℃.
Further, the heating state is maintained during the high-pressure water descaling, and the water is heated in advance during the high-pressure water descaling.
Furthermore, the temperature is 900 ℃ during quenching, the quenching temperature is not higher than 30 ℃ in a floating way, and the lowest temperature floating is not lower than 800 ℃.
Further, the surface treatment work of the qualified product is polishing and plating work.
The invention has the advantages and positive effects that:
1. because the blank is cleaned and inspected in advance, impurities are prevented from being mixed in the processing and heating processes in the later stage, problematic products are prevented from entering the processing procedure, the products are prevented from being broken or having other quality problems in the processing process, the product quality is effectively improved, and the defective rate of the products is reduced.
2. Because the preheating temperature is controlled to be 200-300 ℃, the later-stage cutting work is facilitated, the plasticity of steel is increased, the problem of product quality in the cutting process is reduced, and the smoothness and the integrity of the cutting surface can be ensured.
3. Due to the fact that the heating temperature is controlled to be 1300 ℃, the formation of austenite crystals just inside is guaranteed, the temperature floating range is guaranteed, and the situation that the strength of a product is reduced due to insufficient austenite crystals or other crystal transformation caused by temperature change is prevented.
4. The descaling operation is carried out at 900 ℃, the outside oxide layer is guaranteed to be removed, the oxide layer is prevented from entering the interior of the product, the product quality is reduced, the structural strength is not stable, the temperature of water is guaranteed, the product is prevented from being adversely affected by severe cooling, the descaling operation is finished, the carburizing operation is rapidly carried out at high temperature, the strength of the steel pipe is enhanced, and the formation of the high-strength steel pipe is effectively guaranteed.
5. The head and the tail are cut off after each stage of machining in the machining process, quality problems easily occur to the two end parts, insufficient machining is easy to occur, defective end parts are eliminated by cutting off the end parts, and the same quality of the whole steel pipe is guaranteed.
Detailed Description
A high-strength steel pipe machining process is characterized in that: the processing technology comprises the following steps: firstly, cleaning and inspecting blanks, preheating the blanks which are qualified and have no quality problem, controlling preheating temperature at 200-, and carrying out flaw detection after the steel pipe is straightened, and carrying out surface treatment on qualified products.
The floating range of the preheating temperature is not more than 50 ℃.
The temperature floating range in the blank heating process is not more than 30 ℃, and the temperature after floating is not more than 1300 ℃.
And the heating state is kept when the high-pressure water is used for descaling, and the water is heated in advance when the high-pressure water is used for descaling.
The quenching temperature is 900 ℃, the quenching temperature fluctuation is not more than 30 ℃, and the lowest temperature fluctuation is not less than 800 ℃.
The surface treatment work of the qualified product is polishing and plating work.
The working process of the example is as follows: preheating a blank in advance in the machining process, cutting under the condition of ensuring the heating temperature, ensuring the cutting effect and the product quality, controlling the temperature of austenite formation, ensuring the full formation of austenite crystals, effectively ensuring the integral structural strength of the steel pipe, cutting off the part which is easy to cause insufficient processing at the head and the tail, then heating again, descaling, removing an oxide layer on the surface, preventing the mixing of oxidation components and steel pipe materials to cause the influence on the steel pipe structure, then carburizing and quenching, controlling the temperature to be at the lower limit of the temperature of austenite transformation, then quenching, ensuring good quenching effect, simultaneously preventing the austenite from transforming in the quenching process to cause the reduction of the structural strength, performing air cooling after quenching, and maintaining the alert transformation and the integral structural strength of the steel pipe, then cutting off the head and the tail to prevent the end from being processed incompletely, then carrying out correction work to ensure the straightness of the steel pipe, finally carrying out flaw detection work, carrying out surface treatment work after checking no problem, grinding and polishing the surface, and finally carrying out plating on the outer surface to prevent the steel pipe from being corroded.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (6)
1. A high-strength steel pipe machining process is characterized in that: the processing technology comprises the following steps: firstly, cleaning and inspecting blanks, preheating the blanks which are qualified and have no quality problem, controlling preheating temperature at 200-, and carrying out flaw detection after the steel pipe is straightened, and carrying out surface treatment on qualified products.
2. The high-strength steel pipe machining process according to claim 1, characterized in that: the floating range of the preheating temperature is not more than 50 ℃.
3. The high-strength steel pipe machining process according to claim 1, characterized in that: the temperature floating range in the blank heating process is not more than 30 ℃, and the temperature after floating is not more than 1300 ℃.
4. The high-strength steel pipe machining process according to claim 1, characterized in that: and the heating state is kept when the high-pressure water is used for descaling, and the water is heated in advance when the high-pressure water is used for descaling.
5. The high-strength steel pipe machining process according to claim 1, characterized in that: the quenching temperature is 900 ℃, the quenching temperature fluctuation is not more than 30 ℃, and the lowest temperature fluctuation is not less than 800 ℃.
6. The high-strength steel pipe machining process according to claim 1, characterized in that: the surface treatment work of the qualified product is polishing and plating work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911242668.6A CN112916645A (en) | 2019-12-06 | 2019-12-06 | High-strength steel pipe machining process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911242668.6A CN112916645A (en) | 2019-12-06 | 2019-12-06 | High-strength steel pipe machining process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112916645A true CN112916645A (en) | 2021-06-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911242668.6A Pending CN112916645A (en) | 2019-12-06 | 2019-12-06 | High-strength steel pipe machining process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112916645A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633115A (en) * | 2009-08-06 | 2010-01-27 | 刘怀文 | Novel method for producing high-grade alloy steel seamless steel tube |
| CN101914666A (en) * | 2010-09-19 | 2010-12-15 | 天津钢管集团股份有限公司 | Method for improving transverse impact toughness of seamless steel tube |
| CN101984093A (en) * | 2010-10-28 | 2011-03-09 | 中冶京诚工程技术有限公司 | Hot charging method and system for continuous casting round billet of hot rolled steel pipe |
| CN102069104A (en) * | 2010-11-30 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode |
| WO2016192709A1 (en) * | 2015-05-29 | 2016-12-08 | Salzgitter Mannesmann Line Pipe Gmbh | Method and device for producing bimetallic pipes |
| CN107363124A (en) * | 2017-08-25 | 2017-11-21 | 攀钢集团研究院有限公司 | The manufacture method of Aero-Space seamless steel pipe |
-
2019
- 2019-12-06 CN CN201911242668.6A patent/CN112916645A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633115A (en) * | 2009-08-06 | 2010-01-27 | 刘怀文 | Novel method for producing high-grade alloy steel seamless steel tube |
| CN101914666A (en) * | 2010-09-19 | 2010-12-15 | 天津钢管集团股份有限公司 | Method for improving transverse impact toughness of seamless steel tube |
| CN101984093A (en) * | 2010-10-28 | 2011-03-09 | 中冶京诚工程技术有限公司 | Hot charging method and system for continuous casting round billet of hot rolled steel pipe |
| CN102069104A (en) * | 2010-11-30 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode |
| WO2016192709A1 (en) * | 2015-05-29 | 2016-12-08 | Salzgitter Mannesmann Line Pipe Gmbh | Method and device for producing bimetallic pipes |
| CN107363124A (en) * | 2017-08-25 | 2017-11-21 | 攀钢集团研究院有限公司 | The manufacture method of Aero-Space seamless steel pipe |
Non-Patent Citations (2)
| Title |
|---|
| 左世辉: "《气焊工》", 31 January 1989 * |
| 康永林: "《轧制工程学》", 30 September 2014 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210608 |