CN117619930A - Preparation method of multi-section variable-diameter stainless steel pipe - Google Patents
Preparation method of multi-section variable-diameter stainless steel pipe Download PDFInfo
- Publication number
- CN117619930A CN117619930A CN202311396254.5A CN202311396254A CN117619930A CN 117619930 A CN117619930 A CN 117619930A CN 202311396254 A CN202311396254 A CN 202311396254A CN 117619930 A CN117619930 A CN 117619930A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- pipe
- preset specification
- outer diameter
- steel tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 78
- 239000010935 stainless steel Substances 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- 238000005097 cold rolling Methods 0.000 claims abstract description 25
- 238000000137 annealing Methods 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 17
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 10
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 9
- 239000006104 solid solution Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 3
- 238000009987 spinning Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 18
- 238000005554 pickling Methods 0.000 claims description 15
- 239000000047 product Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007665 sagging Methods 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000004513 sizing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention belongs to the technical field of pipe preparation, and particularly provides a preparation method of a multi-section variable-diameter stainless steel pipe, which comprises the following steps: cold rolling the stainless steel tube blank with the first preset specification to obtain a stainless steel tube with the second preset specification; carrying out solid solution treatment on the cold-rolled finished product, wherein the solid solution temperature is 850-1030 ℃; acid washing the stainless steel tube by using mixed acid; the mixed acid at least comprises nitric acid, hydrofluoric acid and deionized water; reducing and forming the stainless steel pipe into a reducing pipe with a third preset specification; annealing the reducer pipe; and cutting the size of the reducer pipe according to a fourth preset specification. The preparation method of the multi-section variable-diameter stainless steel pipe can realize the engineering production of the multi-section variable-diameter stainless steel pipe with high precision and high performance used in the precision manufacturing industry, and is simple, low in production cost and high in processing efficiency.
Description
Technical Field
The application belongs to the technical field of pipe preparation, and particularly relates to a preparation method of a multi-section variable-diameter stainless steel pipe.
Background
The diameter-variable stainless steel pipe for the nuclear power station fuel reactor core has the advantages of high machining precision, high performance requirement and multi-section diameter-variable requirement. The existing processing technology of the variable-diameter stainless steel pipe adopts a rotary forging mode, and a mandrel with a corresponding size is placed in the pipe for forging and forming, so that the problems of low yield and unstable quality of products are caused by low processing precision. The processing technology of the high-precision high-performance multi-section reducing stainless steel pipe aims to solve the problems that the reducing of the multi-section stainless steel pipe with different sizes is carried out on the stainless steel pipe with the diameter of 1000mm-4000mm, the stainless steel pipe after the reducing can meet the coaxiality requirement, meanwhile, the necking section of the pipe meets the high-temperature tensile performance requirement, and the straight pipe section meets the flaring test requirement. The process is complex, high-precision rolling and deformation are needed, the thermal processing window is narrow, and the manufacturing and production yield is low.
Disclosure of Invention
The purpose of the application is to provide a preparation method of a multi-section reducing stainless steel pipe, so as to solve the problems of low precision and low production yield of the reducing stainless steel pipe in the prior art.
In order to solve the above technical problems, according to some embodiments, the present application provides a method for preparing a multi-section reducing stainless steel pipe, including:
cold rolling the stainless steel tube blank with the first preset specification to obtain a stainless steel tube with the second preset specification; the outer diameter in the first preset specification is larger than the outer diameter in the second preset specification, and the inner diameter in the first preset specification is larger than the inner diameter in the second preset specification;
carrying out solid solution treatment on the cold-rolled finished product, wherein the solid solution temperature is 850-1030 ℃;
acid washing the stainless steel tube by using mixed acid; the mixed acid at least comprises nitric acid, hydrofluoric acid and deionized water;
reducing and forming the stainless steel pipe into a reducing pipe with a third preset specification, wherein the reducing pipe is provided with a plurality of straight pipe sections and a plurality of necking sections, and the outer diameter of the straight pipe sections is larger than that of the necking sections;
annealing the reducer pipe;
and cutting the size of the reducer pipe according to a fourth preset specification.
Further, the first preset specification is that the outer diameter phi 32mm multiplied by phi 2.5mm multiplied by Lmm, the outer diameter tolerance is +/-0.1 mm, and the wall thickness tolerance is +/-0.1 mm; the straightness of the tube blank is 0.7mm/1000mm; grain size GB/T6394 grade; the alpha of the pipe is equal to or lower than 1.5 grade according to GB/T13305.
Further, the cold rolling includes a first cold rolling and a second cold rolling;
the specification of the cold-rolled semi-finished product obtained by the first cold rolling is as follows: phi 19mm multiplied by phi 1.2mm multiplied by Lmm, the tolerance of the outer diameter is less than or equal to 0.1mm, the tolerance of the wall thickness is less than or equal to 0.1mm, and the straightness is 0.7mm/1000mm;
the first cold rolling is carried out to obtain a cold-rolled finished product with the second preset specification; the second preset specification is as follows: phi 13mm x phi 1.2mm x Lmm, the tolerance of the outer diameter is +/-0.03 mm, the tolerance of the inner diameter is +/-0.03 mm, and the straightness is 0.7mm/1000mm.
Further, after the pickling process, before the reducing forming, straightening the stainless steel pipe, wherein the change of the outer diameter of the stainless steel pipe before and after straightening is less than or equal to 15 mu m.
Further, the mass ratio of nitric acid to hydrofluoric acid to deionized water is 3:2:15.
Further, the reducing forming spinning process includes:
spinning the stainless steel pipe by using spinning equipment, wherein a spinning frame with axial motion power is arranged on the spinning equipment, and a plurality of balls capable of adjusting radial positions are arranged on the spinning frame; the plurality of balls apply pressure to the stainless steel tube through the positioning block so as to carry out spinning;
and (3) carrying out sectional processing on the stainless steel pipe to form a straight pipe section and a necking section of the stainless steel pipe, so as to obtain the reducer pipe.
Further, the annealing adopts a vacuum annealing furnace; the reducer pipe is in a free sagging state in the annealing furnace; the initial annealing temperature is 900 ℃, and the reducer pipe is cooled to below 100 ℃ along with the furnace temperature.
Further, after said sizing said reducer pipe, comprising:
and performing size measurement, tensile property test, compression resistance test and ultrasonic detection on the reducer pipe.
The technical scheme of the application has at least the following beneficial technical effects:
the preparation method of the multi-section variable-diameter stainless steel pipe can realize the engineering production of the high-precision multi-section variable-diameter stainless steel pipe used in the precision manufacturing industry, and is low in production cost and high in processing efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the drawings that are required to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flow chart of a method of manufacturing a multi-section reducing stainless steel tubing in one embodiment of the present application.
FIG. 2 is a front view of a multi-section reducing stainless steel tubing in one embodiment of the present application.
The reference numerals are:
A. a straight pipe section; B. a necking section.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, as will be appreciated by those of ordinary skill in the art, in the various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present application, and the embodiments may be combined with each other and cited with each other without contradiction.
At present, the diameter-variable stainless steel tube in the prior art has the problems of low precision and low production yield.
Example 1
In order to solve the above problems, an embodiment of the present application provides a method for preparing a multi-section reducing stainless steel pipe, as shown in a method flowchart of fig. 1, including:
s1, selecting stainless steel with a first preset specification as a tube blank, wherein the first preset specification is phi 32mm multiplied by phi 2.5mm multiplied by Lmm, the outer diameter tolerance is +/-0.1 mm, and the wall thickness tolerance is +/-0.1 mm; the straightness of the tube blank is 0.7mm/1000mm; grain size GB/T6394 grade; taking the cross section of the tube blank from the low-power tissue, observing the cross section of the tube blank, and not allowing the defects of cracks, bubbles, layering, inclusions and the like; the high-power organization grain size is not lower than 5 grades, and the alpha phase is not higher than 1.5 grades of GB/T13305; the surface quality has no phenomena of crack, fold, peeling, serious scratch, serious adhesion, and the like. The length L of the stainless steel of the first preset specification is not particularly limited, and "Φ32mm×Φ2.5mm× Lmm" is taken as an example: the first Φ represents the outer diameter, the second Φ represents the inner diameter, and L represents the length, and the specifications of the stainless steel pipe in the first embodiment are also expressed in this manner.
S2, cold rolling the stainless steel tube blank with the first preset specification to obtain a stainless steel tube with the second preset specification; the outer diameter in the first preset specification is larger than the outer diameter in the second preset specification, and the inner diameter in the first preset specification is larger than the inner diameter in the second preset specification;
wherein the cold rolling is performed twice, namely, the cold rolling comprises a first cold rolling and a second cold rolling; the specification of the cold-rolled semi-finished product obtained by the first cold rolling is as follows: phi 19mm multiplied by phi 1.2mm multiplied by Lmm, the tolerance of the outer diameter is less than or equal to 0.1mm, the tolerance of the wall thickness is less than or equal to 0.1mm, and the straightness is 0.7mm/1000mm; cold rolling for the first time to obtain a cold-rolled finished product with a second preset specification; the second preset specification is: phi 13mm x phi 1.2mm x Lmm, the tolerance of the outer diameter is +/-0.03 mm, the tolerance of the inner diameter is +/-0.03 mm, and the straightness is 0.7mm/1000mm.
The cold rolling is gradual cold rolling, and 80mm-100mm samples are cut every 15m-20m for inner diameter, outer diameter, roundness, length and other dimension measurement; a30 mm-50mm sample was cut to examine the inner surface. And (3) carrying out surface quality inspection and straightness inspection on the cold-rolled finished product after cold rolling, and removing defects such as scratches, folds and the like by adopting a coping mode. The straightness should meet the requirement of 0.7mm/1000mm, if not, the straightness can be corrected by adopting a straightening mode.
S3, carrying out solution treatment on the cold-rolled finished product to reduce the grain size of the structure of the stainless steel tube of the cold-rolled finished product, so that the internal structure is more uniform, and the workability of the stainless steel tube is improved; the solid solution temperature is 850-1030 ℃;
s4, pickling the stainless steel tube by using mixed acid; the mixed acid at least comprises nitric acid, hydrofluoric acid and deionized water; the mass ratio of nitric acid, hydrofluoric acid and deionized water is 3:2:15. The pickling process comprises the following steps: placing the stainless steel tube on a conveying roller, rotating the stainless steel tube along with the conveying roller, and pickling the inner and outer surfaces of the stainless steel tube in a spraying mode; the surface of the pipe after pickling is not allowed to have oxide skin, acid spots, water marks and other unremoved pollution layers.
S5, straightening the stainless steel tube after the pickling process and before the reducing forming; the outer diameter size and the surface quality of the stainless steel pipe are monitored in the straightening process; the change of the outer diameter of the straightening stainless steel tube is not excessively large, and the change of the outer diameter of the stainless steel tube before and after straightening is smaller than or equal to 15um.
S6, reducing and forming the stainless steel pipe into a reducing pipe with a third preset specification, wherein the reducing pipe is provided with a plurality of straight pipe sections A and a plurality of necking sections B, and the outer diameter of the straight pipe sections A is larger than that of the necking sections B;
the reducing forming spinning process comprises the following steps:
spinning the stainless steel pipe by using spinning equipment, wherein a spinning frame with axial motion power is arranged on the spinning equipment, and a plurality of balls capable of adjusting radial positions are arranged on the spinning frame; the plurality of balls apply pressure to the stainless steel tube through the positioning block so as to carry out spinning; the surface precision of the ball is better than 1.6um, the specific size is determined by the radius of the transition fillet of the product, and the radial moving distance of the ball is set between 0.5mm and 2mm. The stainless steel tube blank is sleeved on a core die coaxially connected with the spinning equipment, the balls reversely and passively rotate through friction force generated by contact with a tube blank sleeved on the core die, meanwhile, the spinning frame axially moves, and the balls exert pressure to enable the tube blank to continuously and plastically deform. The ball makes the core mould move in the axial direction for a certain distance (the range is 200 mm-800 mm) through the positioning block to move radially and press on the tube blank, and the action can be repeated for 3-10 times to form the multi-section reducer tube.
The stainless steel pipe is segmented to form a straight pipe section A and a necking section B, so that the reducer pipe is obtained, and the length of one end of the stainless steel pipe is required to be 350-400 mm during necking. In the forming process, the wall thickness and the inner diameter size of a necking section B of the pipe, the lengths and the surface quality conditions of the necking section B and a straight pipe section A are required to be checked, and the fillet radius of the transition part of the necking section B is required to be detected by cutting after the core mold is replaced.
S7, annealing the reducer pipe; the annealing adopts a vacuum annealing furnace; the reducer pipe is in a free sagging state in the annealing furnace; the initial annealing temperature is 900 ℃, and the reducer pipe is cooled to below 100 ℃ along with the furnace temperature. So as to eliminate the residual internal stress of the reducer pipe, refine grains, unify the structure and components of the stainless steel, prevent deformation and cracking, and improve toughness.
S8, cutting and fixing the size of the reducer pipe according to a fourth preset specification. When the cutting scale is carried out, the problems of pipe flattening, pipe end necking, flanging or claw scratching and the like are easy to occur, and a finished product cutting machine is required to be used for cutting the finished product.
S9, after the size of the reducer pipe is cut, the reducer pipe comprises: the reducer pipe is subjected to dimensional measurement, tensile property test (room temperature, high temperature), compression test and ultrasonic detection.
The outside diameter of the pipe is measured by a micrometer with the precision of 0.001mm or other measuring tools with corresponding precision, and the inside diameter size is measured by a pneumatic measuring instrument. And detecting the length of the necking section B and the length of the transition section by adopting a vernier caliper, detecting the necking section B by using an over gauge, and checking the coaxiality of the necking section B and the straight pipe section A by using a specific coaxiality measurement core rod.
The test parameters of the hydraulic test are as follows: the pressure is not lower than 15.7MPa, and the dwell time is not less than 10 seconds.
The size of the artificial wound detected by ultrasonic is 0.05mm plus or minus 0.005mm in depth, 0.050mm plus or minus 0.005mm in width and 5.0mm plus or minus 0.2mm in length.
Example two
A variable diameter stainless steel pipe having an outer diameter of 13mm, an inner diameter of 12mm and a length of 1500mm was produced.
Selecting a stainless steel pipe with the outer diameter phi of 17.8mm and the wall thickness of 1mm and Lmm as a pipe blank, wherein the outer diameter tolerance is +/-0.05 mm, and the wall thickness tolerance is +/-0.05 mm; the straightness of the tube blank is 0.7mm/1000mm; the surface quality is good, and the defects of influence on cold rolling such as cracks, folds, deep scratches and the like are avoided; grain size GB/T6394 grade; the alpha phase of the pipe is not higher than 1.5 grade according to GB/T13305.
Cold rolling the stainless steel tube; the cold-rolled finished product is phi 13mm multiplied by phi 12mm multiplied by Lmm, the tolerance of the outer diameter is +/-0.03 mm, the tolerance of the inner diameter is +/-0.03 mm, and the straightness is 0.7mm/1000mm.
The stainless steel tube is subjected to solid solution treatment, and the solid solution temperature is 850-1030 ℃.
Pickling the stainless steel tube, wherein the mixed acid solution comprises nitric acid, hydrofluoric acid and deionized water; wherein the mass ratio is as follows: 13-16% of nitric acid, 4-13% of deionized water and the balance of deionized water, wherein the pickling time is 10-30 min. Before pickling, an empty material frame is required to be used for shaking and stirring in an acid tank, so that pickling is uniform. The pipes are orderly stacked on the material rack, one end of the pipes firstly enters the acid liquor, and timing is started after the acid liquor is filled with the pipes. In the pickling process, the pipe is rocked up and down in the acid liquor to ensure that the pickling removal amount of the inner surface and the outer surface of the pipe is uniform. After pickling, placing the material frame filled with the pipe into a flushing area to be flushed by high-pressure water. The residual water of the washed stainless steel tube is blown off by compressed air; the surface of the pipe after pickling has no pollution layer.
Carrying out pressureless bending straightening on the stainless steel tube; and detecting the outer diameter of the pipe before and after straightening, wherein the outer diameter is controlled within 60 mu m. The straightness of the straightened pipe is not more than 0.7mm/1000mm.
Reducing pipe molding: and (5) processing the variable-diameter section of the pipe by adopting a spinning lathe and adopting a spinning process. The lathe is provided with a rotary wheel frame with axial movement power, and the rotary wheel frame is provided with fixed balls and a positioning block. The spin frame moves in the axial direction at a rate of 1000mm/min, and at the location of the locating block, the balls move 0.5mm in a radial direction. The surface accuracy of the ball is 0.8um. The tube blank is sleeved on a core rod coaxially connected with special equipment, and the balls are in contact with the tube blank sleeved on the core rod and exert pressure to enable the tube blank to continuously and plastically deform. And repeating the process for 2 times to finish the diameter change of the pipe. In the forming process, the wall thickness and the inner diameter size of a necking section B of the pipe, the length and the surface quality condition of the necking section B and a straight pipe section A are required to be checked; and after the core head is replaced, the corner radius of the transition part of the necking section B is detected by sample cutting.
And (3) annealing the reducer pipe by using a vertical vacuum annealing furnace, punching the head of the reducer pipe, and loading the reducer pipe into the furnace in a hanging manner by using a high-temperature stainless steel wire. The pipe can be discharged after being cooled to below 100 ℃ along with the furnace.
And (3) cutting the fixed length, namely selecting one end for positioning before cutting the fixed length according to the number of the necking section B shown in the drawing so as to ensure the fixed length of the pipe after cutting the end at the other end.
And (3) checking: the outside diameter of the pipe is measured by a micrometer with the precision of 0.001mm or other measuring tools with corresponding precision, and the inside diameter size is measured by a pneumatic measuring instrument. And detecting the length of the necking section B and the length of the transition section by adopting a vernier caliper, detecting the necking section B by using an over gauge, and checking the coaxiality of the necking section B and the straight pipe section A by using a specific coaxiality measurement core rod.
The stainless steel pipe prepared by the method for preparing the multi-section variable-diameter stainless steel pipe is high in yield and processing efficiency, the inner diameter and outer diameter dimension precision of the pipe can reach 0.06mm, the straightness can reach 0.7mm/1000mm, the coaxiality is 0.01mm, and the market requirements for high-grade high-precision nuclear power and other stainless steel pipes can be met.
In the description of the present invention, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be understood that the above-described embodiments of the present application are merely illustrative of or explanation of the principles of the present application and are in no way limiting of the present application. Accordingly, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present application are intended to be included within the scope of the present application. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (8)
1. The preparation method of the multi-section reducing stainless steel pipe is characterized by comprising the following steps of:
cold rolling the stainless steel tube blank with the first preset specification to obtain a stainless steel tube with the second preset specification; the outer diameter in the first preset specification is larger than the outer diameter in the second preset specification, and the inner diameter in the first preset specification is larger than the inner diameter in the second preset specification;
carrying out solid solution treatment on the cold-rolled finished product, wherein the solid solution temperature is 850-1030 ℃;
acid washing the stainless steel tube by using mixed acid; the mixed acid at least comprises nitric acid, hydrofluoric acid and deionized water;
reducing and forming the stainless steel pipe into a reducing pipe with a third preset specification, wherein the reducing pipe is provided with a plurality of straight pipe sections (A) and a plurality of necking sections (B), and the outer diameter of the straight pipe sections (A) is larger than that of the necking sections (B);
annealing the reducer pipe;
and cutting the size of the reducer pipe according to a fourth preset specification.
2. The method of claim 1, wherein the first predetermined specification is an outer diameter Φ32mm x Φ2.5mm x Lmm, an outer diameter tolerance of ±0.1mm, and a wall thickness tolerance of ±0.1mm; the straightness of the tube blank is 0.7mm/1000mm; grain size GB/T6394 grade; the alpha of the pipe is equal to or lower than 1.5 grade according to GB/T13305.
3. The method of manufacturing according to claim 2, wherein the cold rolling includes a first cold rolling and a second cold rolling;
the specification of the cold-rolled semi-finished product obtained by the first cold rolling is as follows: phi 19mm multiplied by phi 1.2mm multiplied by Lmm, the tolerance of the outer diameter is less than or equal to 0.1mm, the tolerance of the wall thickness is less than or equal to 0.1mm, and the straightness is 0.7mm/1000mm;
the first cold rolling is carried out to obtain a cold-rolled finished product with the second preset specification; the second preset specification is as follows: phi 13mm x phi 1.2mm x Lmm, the tolerance of the outer diameter is +/-0.03 mm, the tolerance of the inner diameter is +/-0.03 mm, and the straightness is 0.7mm/1000mm.
4. The method according to claim 1, wherein after the pickling process, the stainless steel tube is straightened before the reducing forming, and the change in the outer diameter of the stainless steel tube before and after straightening is 15 μm or less.
5. The method according to claim 1, wherein the mass ratio of nitric acid, hydrofluoric acid and deionized water is 3:2:15.
6. The method of manufacturing according to claim 1, wherein the reducing forming spinning process comprises:
spinning the stainless steel pipe by using spinning equipment, wherein a spinning frame with axial motion power is arranged on the spinning equipment, and a plurality of balls capable of adjusting radial positions are arranged on the spinning frame; the plurality of balls apply pressure to the stainless steel tube through the positioning block so as to carry out spinning;
and (3) carrying out sectional processing on the stainless steel pipe to form a straight pipe section (A) and a necking section (B) to obtain the reducer pipe.
7. The method according to claim 1, wherein the annealing is performed by a vacuum annealing furnace; the reducer pipe is in a free sagging state in the annealing furnace; the initial annealing temperature is 900 ℃, and the reducer pipe is cooled to below 100 ℃ along with the furnace temperature.
8. The method of manufacturing according to claim 1, characterized in that after said sizing of said reducer pipe, it comprises:
and performing size measurement, tensile property test, compression resistance test and ultrasonic detection on the reducer pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311396254.5A CN117619930A (en) | 2023-10-25 | 2023-10-25 | Preparation method of multi-section variable-diameter stainless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311396254.5A CN117619930A (en) | 2023-10-25 | 2023-10-25 | Preparation method of multi-section variable-diameter stainless steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117619930A true CN117619930A (en) | 2024-03-01 |
Family
ID=90015408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311396254.5A Pending CN117619930A (en) | 2023-10-25 | 2023-10-25 | Preparation method of multi-section variable-diameter stainless steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117619930A (en) |
-
2023
- 2023-10-25 CN CN202311396254.5A patent/CN117619930A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102632094B (en) | Method for improving surface quality of titanium and titanium alloy pipes and drawing die | |
| CN102527767B (en) | Cold drawing welded tube manufacture process for high-accuracy hydraulic oil cylinder | |
| Molladavoudi et al. | Experimental study of thickness reduction effects on mechanical properties and spinning accuracy of aluminum 7075-O, during flow forming | |
| CN110052792B (en) | Manufacturing method of cylinder barrel for hydraulic cylinder | |
| CN111451309B (en) | Hot extrusion die for special-shaped square pipe and hot extrusion integral forming method | |
| CN103658225B (en) | A kind of non-ferrous metal has seam elbow cooling formation technic | |
| CN109604407A (en) | The accurate spinning processing method of minor diameter multi-step change wall thickness cylinder | |
| CN112404163B (en) | Preparation method of high-performance difficult-deformation metal precision seamless pipe | |
| CN110711777B (en) | Manufacturing method of seamless steel tube for large-diameter high-pressure boiler | |
| CN114602996B (en) | Manufacturing method of ultrathin seamless tube for high-end equipment system | |
| CN104708269B (en) | Method for machining large-diameter super-thin-walled tubular product made of high-deformation materials | |
| CN101786112B (en) | Manufacturing method of gas cylinder steel tube for long-tube trailer | |
| CN105665468A (en) | Preparation method for high-precision large-diameter thin-walled titanium tube | |
| CN112170520A (en) | Production method and production system of 110-steel-grade super dual-phase steel seamless steel pipe | |
| CN102873126B (en) | Manufacturing method of large-aperture thin-walled seamless steel tube for nuclear power plant | |
| CN117619930A (en) | Preparation method of multi-section variable-diameter stainless steel pipe | |
| CN111790802A (en) | Offset reverse spinning processing technology for thin-wall cylindrical part | |
| CN102069121A (en) | Spinning method of variable diameter pipe dieless floating rolling ball and fixture | |
| JP4192970B2 (en) | Cold rolling method for metal tubes | |
| CN113441568B (en) | Cold machining manufacturing method of large-caliber thin-wall zirconium alloy pipe | |
| CN104438429A (en) | Forming method of unequal-wall-thickness reducing special-shaped stainless steel pipe | |
| CN113305163A (en) | Drawing production process of equal-outer-diameter and variable-wall-thickness pipe | |
| CN113441675A (en) | High-precision hydraulic cylinder barrel for radial cold forging and manufacturing method thereof | |
| CN100393433C (en) | Cold rolling process for metal tubes | |
| CN113458176A (en) | Manufacturing method of high-precision outer hexagonal and inner circular seamless tube with special-shaped cross section for nuclear power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |