CN114193097A - Processing method for improving ultrasonic flaw detection qualification rate of titanium alloy ultra-long seamless pipe - Google Patents
Processing method for improving ultrasonic flaw detection qualification rate of titanium alloy ultra-long seamless pipe Download PDFInfo
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- CN114193097A CN114193097A CN202111537552.2A CN202111537552A CN114193097A CN 114193097 A CN114193097 A CN 114193097A CN 202111537552 A CN202111537552 A CN 202111537552A CN 114193097 A CN114193097 A CN 114193097A
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Abstract
The invention discloses a processing method for improving the ultrasonic flaw detection qualification rate of a titanium alloy ultra-long seamless pipe. According to the invention, the tube blank pre-preparation process is carried out before cogging rolling in the existing titanium alloy tube preparation process, so that the deviation of the inner diameter and the outer diameter of the tube blank is effectively reduced, further, the defects of the inner surface and the outer surface of the tube blank are eliminated or reduced, the tube blank meeting the process requirements is obtained, and the generation and expansion of cracks on the inner surface and the outer surface of the tube blank in the subsequent processing process are greatly reduced, so that the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless tube is improved, the obtained product has high precision and good stability, the processing efficiency is improved while the product quality is met and stabilized, and the titanium alloy tube preparation process is convenient to popularize and use.
Description
Technical Field
The invention belongs to the technical field of titanium alloy seamless pipe processing, and particularly relates to a processing method for improving the ultrasonic flaw detection qualification rate of a titanium alloy overlong seamless pipe.
Background
The metal titanium is praised as a metal in the 21 st century, belongs to one of rare metals, has the main characteristics of low density, light weight, high strength and corrosion resistance, and is widely applied to various aspects such as heat exchangers of large-scale chemical engineering projects and the like. Along with the increase of the capacity of chemical engineering projects, the volume of the titanium heat exchanger matched with the titanium heat exchanger is larger and larger, and the length of the used seamless pipe is longer and longer. The single-branch length of the pipe used by the heat exchanger is basically concentrated around 6000mm in 2005, and the single-branch length of the pipe has broken through 10000mm or even longer from 2010. As the length of a single branch of the pipe is increased, the production difficulty and the quality control of the pipe are increased by geometric times.
The titanium tube for the outlet heat exchanger carries out the ASTM B338 or ASME SB338 standard, which among other things have very strict requirements, in particular higher requirements for ultrasonic non-destructive testing, which put higher and more strict requirements on the quality of the inner and outer surfaces of the tube and the machining process. At present, the traditional processing method for the titanium alloy ultra-long seamless pipe comprises the following steps: rod blank → drilling → copper cladding → extrusion → decoppering and pickling → blanking → shaving → cogging and rolling → oil removal, pickling, annealing → shaving → middle multi-pass rolling → oil removal, pickling, annealing → shaving → rolling of finished product → oil removal, pickling, annealing → straightening of finished product, flat head → ultrasonic flaw detection → cutting and sizing → final detection → storage of finished product. Under the process, the ultrasonic flaw detection qualification rate of the titanium pipe can reach about 70 percent, namely at least 30 percent of the pipe is unqualified, so that the waste of raw materials is caused, and the production cost and the material cost are high.
Titanium belongs to rare metal, is very expensive, and for an ultra-long pure titanium seamless pipe, how to improve the ultrasonic flaw detection qualification rate is the most key factor for improving the yield, reducing the production cost and improving the production efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe aiming at the defects of the prior art. According to the method, the pipe blank pre-preparation process is carried out before cogging rolling in the existing titanium alloy pipe preparation process, so that the defects of the inner surface and the outer surface of the pipe blank are effectively eliminated or reduced, the pipe blank meeting the process requirements is obtained, and the generation and expansion of cracks on the inner surface and the outer surface of the pipe blank in the subsequent processing process are greatly reduced, so that the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that a pipe blank pre-preparation process is carried out before cogging in the titanium alloy pipe preparation process, and the pipe blank pre-preparation process comprises pipe blank pre-rolling, inner surface boring and outer surface turning.
The preparation process of the titanium alloy ultra-long seamless pipe comprises the following steps: rod blank → drilling → copper cladding → extrusion → decoppering and pickling → blanking → shaving → cogging and rolling → oil removal, pickling, annealing → shaving → middle multi-pass rolling → oil removal, pickling, annealing → shaving → rolling of finished product → oil removal, pickling, annealing → straightening of finished product, flat head → ultrasonic flaw detection → cutting and sizing → final detection → storage of finished product.
In the preparation process of the titanium alloy ultra-long seamless pipe, in order to improve the ultrasonic flaw detection qualification rate, the inner surface is bored after the procedures of oil removal, acid cleaning, annealing and the like are generally carried out after the first-pass large-deformation rolling of cogging rolling is finished, and the outer surface is treated by manual scraping. After the first-pass rolling with large deformation, the inner surface and the outer surface of the titanium alloy pipe both generate large deformation flow due to metal, so that new cracks or original cracks are generated or expanded, although a part of cracks can be removed by adopting the inner surface boring and outer surface manual scraping method, the cracks cannot be completely eliminated, and in the subsequent rolling process, the cracks can be continuously expanded and extended due to the fact that the cracks are not processed completely, and finally the flaw detection qualification rate is low.
On the basis of the existing titanium alloy seamless pipe preparation process, the pipe blank pre-preparation process is carried out before cogging rolling in the existing titanium alloy pipe preparation process, and comprises pipe blank pre-rolling, inner surface boring and outer surface turning, the inner diameter deviation and the outer diameter deviation of the pipe blank are controlled to be the minimum by utilizing the pipe blank pre-rolling, so that the subsequent defects are favorably removed, then the boring method is continuously adopted to eliminate the defects of the inner surface of the pipe blank, the turning is adopted to replace manual work to eliminate the defects of the outer surface, the subsequent processing is carried out according to the normal process flow, the defects of the inner surface and the outer surface of the pipe blank are effectively eliminated or reduced, the pipe blank meeting the process requirements is obtained, the generation and expansion of cracks of the inner surface and the outer surface of the pipe blank in the subsequent processing process are greatly reduced, and the ultrasonic flaw detection qualification rate of the titanium alloy overlong seamless pipe is improved.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that the cogging rolling is carried out by adopting a two-roller pipe mill, and the deformation is 60-70%. The invention adopts a two-roller pipe mill to realize larger deformation, simultaneously obtains good metallographic structure and comprehensive mechanical property, and is beneficial to improving the qualification rate of the titanium alloy ultra-long seamless pipe.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that the pipe blank is pre-rolled by a three-roll pipe mill, and the deformation amount is 10-25%; the inner surface boring is used for cutting and removing the wall thickness of the inner surface of the pre-rolled tube blank by adopting boring equipment, and the wall thickness removal amount is within 0.5 mm; and the outer surface turning adopts a centerless lathe to turn and remove the wall thickness of the outer surface of the tube blank after the inner surface boring, and the wall thickness removal amount is within 0.5 mm.
In the traditional method for processing the titanium alloy ultra-long seamless pipe, after a pipe blank is cogging through large deformation, the original cracks on the inner surface of the pipe blank can be expanded or coated, although part of defects can be eliminated after an inner hole is bored, the defects cannot be thoroughly eliminated, and in the subsequent rolling process, the clean cracks are not eliminated and are continuously expanded, so that the ultrasonic flaw detection qualification rate of a finished product is reduced.
Meanwhile, the traditional processing method of the titanium alloy ultra-long seamless pipe does not have a process of turning an outer circle, and only adopts a manual scraping method to remove the defects on the outer surface after each pass of rolling, and the scraping quality depends on the proficiency of operators and certain subjective factors, so that the scraping quality and the quality stability cannot be effectively guaranteed, and the production efficiency is low. The invention adopts the centerless lathe to turn the outer surface, namely, the outer circle, can greatly eliminate the defects of the outer surface of the tube blank while ensuring the turning amount, can enter the next procedure for production without scraping and repairing after the subsequent processing of each pass is finished, reduces the labor intensity of operators, improves the production efficiency and shortens the production period.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that when the process design is carried out on the titanium alloy ultra-long seamless pipe of a target product, the weight loss of the titanium alloy generated by the pre-rolling, inner surface boring and outer surface turning processes is counted into the weight of a billet, and when the specification of an extruded pipe blank is designed, the wall thickness removal amount of the inner surface boring and the outer surface turning is counted into the outer diameter, the inner diameter and the wall thickness of the extruded pipe blank. According to the volume invariance law of the rolling processing, the weight loss of the titanium alloy generated by the tube blank prefabrication process is counted into the weight of the bar blank during the process design, and the wall thickness removal amount of the inner surface boring and the outer surface turning is counted into the specification design of the extruded tube blank, so that the adverse effect of the processing amount of the tube blank prefabrication process on the whole process is avoided, and the dimension specification of the obtained target product titanium alloy ultra-long seamless tube meets the design requirement.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that the pre-rolling of the pipe blank is one-pass rolling. According to the invention, through one-pass pre-rolling of the tube blank and the adoption of smaller rolling deformation, the outer diameter and the inner hole size of the tube blank are optimized, convenient conditions are provided for subsequent boring and turning, and the straightness of the titanium alloy ultra-long seamless tube is greatly improved by combining a subsequent straightening process.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the pipe blank pre-preparation process is carried out before cogging rolling in the existing titanium alloy pipe preparation process, and comprises pipe blank pre-rolling, inner surface boring and outer surface turning, so that the defects of the inner surface and the outer surface of the pipe blank are effectively eliminated or reduced, the pipe blank meeting the process requirements is obtained, the generation and expansion of cracks on the inner surface and the outer surface of the pipe blank in the subsequent processing process are greatly reduced, and the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is improved.
2. The method has the advantages of simple process, low processing difficulty and cost, high precision and stability of the obtained product, high ultrasonic flaw detection qualification rate of the product, high processing efficiency while meeting and stabilizing the product quality, and convenience in popularization and use.
3. The equipment adopted by the processing method is conventional equipment used in the production process of the pipe, is easy to obtain and realize processing, and further improves the practicability of the processing method.
4. The processing method reduces the generation of cracks on the outer surface of the pipe in subsequent processing, avoids the procedure of manually scraping and repairing the outer surface of the semi-finished product in the production process of the pipe, reduces the labor intensity of operators, improves the processing precision and the processing efficiency, and shortens the production period of the pipe.
5. The method of the invention is not only suitable for the titanium alloy overlong seamless pipe, but also suitable for the processing process of zirconium or other alloy overlong seamless pipes.
The technical solution of the present invention is further described in detail by examples below.
Detailed Description
Taking a titanium alloy ultra-long seamless pipe with the design specification of phi 19mm multiplied by 1.24mm multiplied by 11000mm (outer diameter multiplied by wall thickness multiplied by length), the mark number of Gr.7 and the execution standard of ASTM B338 as an example, the pipe is prepared according to a traditional processing method of a comparative example 1 and the processing method of the invention of an embodiment 1 respectively, and the specific related process flow is shown in the following table 1:
TABLE 1
As can be seen from Table 1, the flaw detection qualification rate of the titanium alloy ultra-long seamless pipe processed in the embodiment 1 is 78.81%, which is improved by nearly 10% compared with 69.56% in the traditional process of the comparative example 1, which shows that the processing method of the invention effectively improves the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe, greatly reduces the total feeding amount, reduces the labor intensity of operators, shortens the production cycle, further improves the production efficiency, and reduces the material cost and the production cost.
The tube blank pre-preparation process of the embodiment 1 comprises tube blank pre-rolling, inner surface boring and outer surface turning, wherein cogging rolling is carried out by adopting a two-roller tube mill, the deformation is 62.50%, tube blank pre-rolling is carried out by adopting a three-roller tube mill, the rolling pass is one pass, the deformation is 15.56%, and outer surface turning is carried out by adopting a centerless lathe.
Meanwhile, aiming at the titanium alloy ultra-long seamless pipe with the same specification, in the embodiment 1, the weight loss of the titanium alloy generated by the pre-rolling, inner surface boring and outer surface turning processes is counted into the weight of a bar billet in the process design, and the wall thickness removal amount of the inner surface boring and the outer surface turning is counted into the outer diameter, the inner diameter and the wall thickness of an extruded pipe billet in the specification design of the extruded pipe billet, so that the outer diameter and the wall thickness of the pipe billet adopted in the embodiment 1 are both larger than those of the comparative example 1, the extrusion adopted in the extrusion process of the pipe billet is small, the extrusion force is small, the generation of processing defects is favorably inhibited, better structure performance can be obtained at the same time, the drilling specification of the embodiment 1 is smaller than that of the comparative example 1, and the titanium alloy raw material is saved.
A plurality of batch tests prove that the processing method is stable and reliable, is suitable for processing the titanium alloy ultra-long seamless pipe, can be popularized and applied to the production of titanium alloy high-grade seamless pipes, zirconium seamless pipes and nickel seamless pipes, and has high popularization value.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (5)
1. The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that a pipe blank pre-preparation process is carried out before cogging in the titanium alloy pipe preparation process, and the pipe blank pre-preparation process comprises pipe blank pre-rolling, inner surface boring and outer surface turning.
2. The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe according to claim 1, wherein the cogging rolling is carried out by adopting a two-roll pipe mill, and the deformation is 60-70%.
3. The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe according to claim 1, characterized in that the pre-rolling of the pipe blank is carried out by a three-roll pipe mill, and the deformation amount is 10-25%; the inner surface boring is used for cutting and removing the wall thickness of the inner surface of the pre-rolled tube blank by adopting boring equipment, and the wall thickness removal amount is within 0.5 mm; and the outer surface turning adopts a centerless lathe to turn and remove the wall thickness of the outer surface of the tube blank after the inner surface boring, and the wall thickness removal amount is within 0.5 mm.
4. The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe according to claim 1, wherein the weight loss of the titanium alloy generated by the pre-rolling, inner surface boring and outer surface turning processes is counted into the weight of a bar billet when the process design is carried out on the titanium alloy ultra-long seamless pipe of a target product, and the wall thickness removal amount of the inner surface boring and the outer surface turning is counted into the outer diameter, the inner diameter and the wall thickness of an extruded pipe blank when the specification of the extruded pipe blank is designed.
5. The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe according to claim 1, wherein the pre-rolling of the pipe blank is a one-pass rolling.
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Address after: 710299 No. 19, east section of Jinggao North Road, Jingwei new town, Xi'an Economic and Technological Development Zone, Xi'an City, Shaanxi Province Patentee after: Xi'an Western New Zirconium Technology Co.,Ltd. Address before: 710299 No. 19, east section of Jinggao North Road, Jingwei new town, Xi'an Economic and Technological Development Zone, Xi'an City, Shaanxi Province Patentee before: WESTERN ENERGY MATERIAL TECHNOLOGIES CO.,LTD. |