CN111451313A - Method for processing low-activation martensitic steel C L F-1 steel pipe - Google Patents
Method for processing low-activation martensitic steel C L F-1 steel pipe Download PDFInfo
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- CN111451313A CN111451313A CN202010286304.4A CN202010286304A CN111451313A CN 111451313 A CN111451313 A CN 111451313A CN 202010286304 A CN202010286304 A CN 202010286304A CN 111451313 A CN111451313 A CN 111451313A
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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
- 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
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
Abstract
The invention discloses a method for processing a low-activation martensitic steel C L F-1 steel pipe in the technical field of steel piece production, which comprises the following steps of S1, processing a pipe blank, cutting the C L F-1 pipe blank into long pieces, cutting the pipe blank into fixed lengths, fixing the pipe blank into a pipe core, checking, grinding, putting the pipe core into an inclined bottom furnace, heating, S2, processing a pierced billet, perforating the heated pipe blank to form a pierced billet, grinding and flatting two ends of the pierced billet, performing acid washing to obtain a cold-rolled intermediate product, and performing overall grinding and checking, wherein the machining performance of the C L F-1 steel pipe during processing can be effectively ensured through a cold working deformation process, and the mechanical performance and the surface quality of the C L F-1 steel pipe can be effectively improved through the processing processes of the pipe blank, the pierced billet, the intermediate pipe and a finished product pipe, and the finished product pipe can be conveniently checked again, so that the quality of finished products in storage can be ensured.
Description
Technical Field
The invention relates to the technical field of steel part production, in particular to a processing method of a low-activation martensitic steel C L F-1 steel pipe.
Background
The C L F-1 steel is low-activation ferrite/martensite steel (RAFM) which is specially used for developing a solid breeder test clad module (HC-SB TBM). at present, the basic concept design work of the solid breeder test clad module is already completed, and the rationality of the structural design of the original-size module and the feasibility of the development process are partially verified.
In the processing process of the existing C L F steel pipe, the processing technology is complex, the processing performance and the surface quality of the steel pipe are difficult to ensure, and the mechanical properties of the steel pipe subjected to heat treatment in all aspects are also difficult to detect, so that the warehousing product is difficult to meet the quality requirement.
Based on the above, the invention designs a processing method of a low-activation martensitic steel C L F-1 steel pipe to solve the problems.
Disclosure of Invention
In order to solve the technical problems mentioned in the prior background art, the invention aims to provide a method for processing a low-activation martensitic steel C L F-1 steel pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a processing method of a low-activation martensitic steel C L F-1 steel pipe comprises the following steps:
s1, processing the tube blank, cutting the C L F-1 tube blank into a fixed length after long cutting, fixing the tube blank, checking and grinding, and then putting the tube blank into an inclined bottom furnace for heating treatment;
s2, processing pierced billets; perforating the heated tube blank to obtain a pierced blank, polishing and flatting the two ends of the pierced blank, performing acid washing to obtain a cold-rolled intermediate product, and performing integral polishing and inspection coping;
s3, processing an intermediate product; deoiling the cold-rolled intermediate product, straightening and trimming the head after heat treatment, carrying out acid cleaning again, carrying out integral polishing and inspection and polishing, and repeating the operation;
s4, processing a finished product; after cold rolling, deoiling again, straightening after heat treatment in a protector, and polishing and sand blasting;
s5, detecting a finished product; and (3) cutting the processed finished product by ultrasonic flaw detection, then cutting the finished product into lines, cutting dead zones and cutting the finished product to length, then checking the surface roughness and size and inspecting the physical and chemical properties, and then warehousing and packaging.
Preferably, the heat treatment temperature of the tube blank in the S1 is firstly preheated in an inclined hearth furnace at the temperature of less than 700 ℃ for 220 minutes and then is increased to 1100 ℃ and 1120 ℃ for 15-20 minutes.
Preferably, the temperature of the pierced billet heat treatment in S2 is first preheated to less than 100 ℃ per hour, and when the temperature is increased to 810 and 830 ℃, the pierced billet is continuously heated for 60 minutes and then annealed and air-cooled to 600 ℃.
Preferably, the number of times of the repeated operation of processing the intermediate product in S3 is determined according to a cold hardening parameter during rolling; and after the intermediate product is subjected to heating annealing through a pierced billet, continuously heating to 830 ℃, and after the temperature is continuously increased for 45 minutes, discharging the intermediate product from the furnace and air-cooling to 600 ℃.
Preferably, the finished product in S4 is placed in a muffle furnace for quenching and tempered in a chamber furnace, and during tempering, the discharged air-cooled intermediate product is preheated to 730 and 750 ℃ per hour at 100 ℃, and is discharged for air cooling after being continuously heated for 1.5 hours.
Compared with the prior art, the method has the beneficial effects that the processing performance of the C L F-1 steel pipe during processing can be effectively ensured through the cold processing deformation process, the mechanical property and the surface quality of the steel pipe can be effectively improved by processing the C L F-1 steel pipe through the processing processes of the pipe blank, the pierced billet, the intermediate pipe and the finished product pipe, and the inspection of each performance index of the finished product in storage can be facilitated through the detection of the finished product pipe, so that the storage quality is ensured.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a temperature control diagram of the tube blank heating process of the present invention;
FIG. 3 is a temperature control diagram of the heat treatment process of the pierced billet and the intermediate pipe billet according to the present invention;
FIG. 4 is a temperature control diagram of the tempering process of the finished product of the present invention;
FIG. 5 is a table diagram showing the room temperature mechanical properties of the steel pipe of the present invention satisfying the parameters.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Referring to fig. 1 to 5, the invention provides a technical scheme that a method for processing a low-activation martensitic steel pipe C L F-1 comprises the following steps:
s1, processing the tube blank, cutting the C L F-1 tube blank into a fixed length after long cutting, fixing the tube blank, checking and grinding, and then putting the tube blank into an inclined bottom furnace for heating treatment;
s2, processing pierced billets; perforating the heated tube blank to obtain a pierced blank, polishing and flatting the two ends of the pierced blank, performing acid washing to obtain a cold-rolled intermediate product, and performing integral polishing and inspection coping;
s3, processing an intermediate product; deoiling the cold-rolled intermediate product, straightening and trimming the head after heat treatment, carrying out acid cleaning again, carrying out integral polishing and inspection and polishing, and repeating the operation;
s4, processing a finished product; after cold rolling, deoiling again, straightening after heat treatment in a protector, and polishing and sand blasting;
s5, detecting a finished product; and (3) cutting the processed finished product by ultrasonic flaw detection, then cutting the finished product into lines, cutting dead zones and cutting the finished product to length, then checking the surface roughness and size and inspecting the physical and chemical properties, and then warehousing and packaging.
The method is characterized in that H2SO4 is preferably adopted for acid cleaning treatment, the acid cleaning surface is inspected in the acid cleaning process to avoid the peracid phenomenon on the pipe surface, the acid cleaning time is determined by checking whether oxide skin can be completely removed, high-pressure water is required to wash the acid cleaned pipe out of a cylinder to guide water flowing out of an inner hole to be free of color change SO as to ensure that the acid cleaning agent is completely removed, the acid cleaning agent can be lifted and prevented from being scratched or damaged when the pipe is taken out of the cylinder, the method is not disclosed, the whole body of a pierced billet is externally ground when hot piercing pierced billet processing is carried out, the quality conditions of the inner surface and the outer surface are inspected, deep scabs and pits are removed by point grinding, cold working annealing is carried out after the processing is finished, the working procedure of cold working is carried out, the specification of the pipe blank is 75mm preferably, the specification of an intermediate product obtained after the processing is more than 38mm, the whole body of the pipe blank is integrally ground by a refined pipe working area after the pipe blank is processed, the working procedure is carried out after the processing is qualified, the working procedure is carried out, the specification of 75mm, the intermediate product is preferably, the specification of phi 38mm, the protective gas treatment, the protective gas is preferably used for carrying out, the surface of the finished product is subjected to be polished, the finish grinding, the surface of the finished product is preferably, the finished product is subjected to the surface of the finished product, the finished product is subjected to.
In a further embodiment, the heat treatment temperature of the tube blank in the S1 is firstly preheated in an inclined bottom furnace at the temperature of less than 700 ℃ for 220 minutes and then heated to 1100 ℃ and 1120 ℃ for 15-20 minutes; as shown in FIG. 2, when a tube blank with a preferred specification of phi 75mm is subjected to a heating process, the tube blank which is completely cold can be slowly heated to 1100-1120 ℃ through long-time preheating treatment, and uniform heating and temperature rise of the tube blank can be conveniently realized.
In a further embodiment, the heat treatment temperature of the pierced billet in S2 is first preheated to less than 100 ℃ per hour, and when the temperature is increased to 810 ℃ and 830 ℃, the pierced billet is continuously heated for 60 minutes and then annealed and air-cooled to 600 ℃; as shown in fig. 3, when the pierced billet is heat-treated, the heat-pierced billet and the pierced billet with the specification exceeding phi 38mm are placed in a platform car-room type furnace of a fine tube working area for annealing treatment, and after the annealing, the temperature is controlled to be about 600 ℃, so that the intermediate product can be conveniently heat-treated by raising the temperature again.
In a further embodiment, the number of times of the repeated operations of the processing of the intermediate product in S3 is determined according to a cold hardening parameter during rolling; after the intermediate product is subjected to heating annealing through a pierced billet, continuously heating to 830 ℃, and after the temperature is continuously increased for 45 minutes, discharging from the furnace and air cooling to 600 ℃; as shown in fig. 3, the intermediate product is heated in a car-type furnace in the coil work area, and the annealing temperature is controlled at 600 degrees centigrade, which is convenient for the subsequent repeating operation and the subsequent finished product processing, when the repeating times of the intermediate product processing are determined to be related to the cold-hardening parameters during rolling, i.e. when the cold-hardening parameters are larger, more manipulation times are needed, and the repeating times of the general operation procedures of cold drawing, annealing, and the like are about 12-15 times. And heat preservation measures should be taken according to the needs in the cold drawing process.
In a further embodiment, the finished product in S4 is placed in a muffle furnace for quenching and tempered in a chamber furnace, and during tempering, the discharged air-cooled intermediate product is preheated to 730 and 750 ℃ per hour at 100 ℃, and is discharged for air cooling after being continuously heated for 1.5 hours; as shown in fig. 4, in the quenching treatment of the finished product, it is preferably considered to be performed in a muffle furnace and tempered in a chamber furnace, and during the tempering, it is necessary to use preferably N2 as a protective gas to prevent the surface from being oxidized.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. A method for processing a low-activation martensitic steel C L F-1 steel pipe is characterized by comprising the following steps:
s1, processing the tube blank, cutting the C L F-1 tube blank into a fixed length after long cutting, fixing the tube blank, checking and grinding, and then putting the tube blank into an inclined bottom furnace for heating treatment;
s2, processing pierced billets; perforating the heated tube blank to obtain a pierced blank, polishing and flatting the two ends of the pierced blank, performing acid washing to obtain a cold-rolled intermediate product, and performing integral polishing and inspection coping;
s3, processing an intermediate product; deoiling the cold-rolled intermediate product, straightening and trimming the head after heat treatment, carrying out acid cleaning again, carrying out integral polishing and inspection and polishing, and repeating the operation;
s4, processing a finished product; after cold rolling, deoiling again, straightening after heat treatment in a protector, and polishing and sand blasting;
s5, detecting a finished product; and (3) cutting the processed finished product by ultrasonic flaw detection, then cutting the finished product into lines, cutting dead zones and cutting the finished product to length, then checking the surface roughness and size and inspecting the physical and chemical properties, and then warehousing and packaging.
2. The method for processing the low-activation martensitic steel C L F-1 steel pipe as claimed in claim 1, wherein the heat treatment temperature of the tube blank in the S1 is first preheated in an inclined hearth furnace at less than 700 ℃ for 220 minutes and then heated to 1100 ℃ and 1120 ℃ for 15-20 minutes.
3. The method for processing the low-activation martensitic steel pipe C L F-1 as claimed in claim 1, wherein the temperature of the pierced billet heat treatment in S2 is preheated to less than 100 ℃ per hour, and when the temperature is increased to 810-830 ℃, the steel pipe is continuously heated for 60 minutes and then annealed and air-cooled to 600 ℃.
4. The method for processing the low-activation martensitic steel C L F-1 steel pipe as claimed in claim 1, wherein the number of times of the repeated operations of the processing of the intermediate product in S3 is determined according to the cold hardening parameters during rolling, the temperature of the intermediate product is continuously raised to 830 ℃ after the heating and annealing of the pierced billet, the annealing is carried out after 45 minutes, and the annealing is carried out and the air cooling is carried out to 600 ℃.
5. The method for processing the low-activation martensitic C L F-1 steel pipe as claimed in claim 1, wherein the finished product in S4 is placed in a muffle furnace for quenching and tempered in a chamber furnace, and during tempering, the intermediate product after being discharged from the furnace for air cooling is preheated to 730 and 750 ℃ per hour at 100 ℃ and is discharged from the furnace for air cooling after being continuously heated for 1.5 hours.
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| CN202010286304.4A CN111451313A (en) | 2020-04-13 | 2020-04-13 | Method for processing low-activation martensitic steel C L F-1 steel pipe |
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| CN202010286304.4A CN111451313A (en) | 2020-04-13 | 2020-04-13 | Method for processing low-activation martensitic steel C L F-1 steel pipe |
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