CN110453109B - NS3306 high-temperature alloy small-caliber precise seamless pipe and manufacturing method thereof - Google Patents
NS3306 high-temperature alloy small-caliber precise seamless pipe and manufacturing method thereof Download PDFInfo
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention provides an NS3306 high-temperature alloy small-caliber precise seamless tube and a manufacturing method thereof. The seamless pipe comprises the following components in percentage by weight: 0.02 to 0.06 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 0.50 percent of Mn, less than or equal to 0.003 percent of S, less than or equal to 0.010 percent of P, 21.5 to 23.0 percent of Cr21, more than or equal to 58.0 percent of Ni, 9.0 to 10.0 percent of Mo9, less than or equal to 0.040 percent of Al, less than or equal to 0.040 percent of Ti, less than or equal to 5.0 percent of Fe, 3.50 to 4.15 percent of Nb and Ta. The seamless pipe manufacturing method of the present invention includes the steps of: cold deformation processing of the intermediate pipe, namely, combining large deformation cold rolling and multi-pass small deformation cold drawing on the pierced billet to form a finished pipe; and (3) heat treatment processing, wherein the heat treatment of the cold-rolled intermediate product adopts a high-temperature annealing process, the annealing temperature is higher than 1080 ℃, the annealing after the final cold drawing adopts a protective atmosphere low-temperature bright annealing process, the annealing temperature is not higher than 1000 ℃, and the protective atmosphere is hydrogen with the purity of more than 99.9%. The seamless tube has the advantages of high dimensional precision, high purity and structural stability and good mechanical property.
Description
Technical Field
The invention relates to the field of high-temperature alloy seamless pipe production, in particular to an NS3306 high-temperature alloy small-caliber precise seamless pipe and a manufacturing method thereof.
Background
At present when the petrochemical energy crisis is more and more serious, solar energy is used as a reliable clean energy, has the advantage that other energy cannot be replaced, and has the characteristics of safety, reliability, cleanness, no pollution, zero emission, abundant resources and the like. Solar energy is widely accepted in the world as a renewable, clean and environment-friendly green energy source. In the field of solar power generation, photovoltaic power generation starts earlier, but the problems of low photoelectric conversion efficiency, large occupied area, high construction cost and the like exist, and the photo-thermal power generation technology is on the rise and gradually becomes the main force of the field of solar power generation, so that the photovoltaic power generation has great potential in future development.
The disc type Stirling photo-thermal power generation system is one of three basic forms (disc type, tower type and groove type) of photo-thermal power generation, and the basic working principle of the system is that sunlight is collected by a disc type collecting lens and then is emitted into a heat collecting disc, the heat collecting disc mainly comprises a high-temperature alloy precise pipe, high-pressure protective gas circulates in the pipe, the protective gas has strong heat transfer capacity at high temperature and high pressure, solar radiation is converted into heat energy to expand to work, and a Stirling generator is pushed to run to generate power. The Stirling generator can also generate electricity by utilizing biomass fuel or waste incineration heat collection, and is a clean and efficient novel energy supply system.
The NS3306 alloy is a solid solution strengthening type nickel-based high-temperature alloy with Mo and Nb as main strengthening elements, has excellent corrosion resistance, oxidation resistance, mechanical property and high-temperature durability, and is used for manufacturing key parts in the industries of aerospace, petrochemical industry and the like. The NS3306 precision tube can be applied to Stirling power generation systems, including photo-thermal power generation, biomass fuel or waste incineration heat collection power generation.
The NS3306 precision tube is used as the core component of the Stirling photo-thermal power generation system, the working condition pressure is about 20MPa, the normal working temperature range is about 600-800 ℃, and when the focusing of the condenser lens is abnormal, the local temperature can reach thousands of degrees centigrade. Hydrogen has better photothermal conversion efficiency than argon under working conditions and is relatively low in cost, so the working gas in the NS3306 precision tube is usually hydrogen. Because hydrogen mixes easy emergence explosion with oxygen under the high temperature high pressure condition, in case the tubular product breaks, hydrogen leaks, will lead to the explosion accident to take place, causes the incident. The NS3306 precision pipe can be operated under the severe working conditions of high temperature and high pressure for a long time, and has high requirements on the chemical components, purity, microstructure, mechanical properties, surface quality and the like of the pipe. In addition, high-temperature brazing is carried out on the NS3306 precision pipe and the pipe seat in the installation process, the diameter precision of the pipe hole is very high, and extremely high requirements are put forward on the size precision of the NS3306 precision pipe.
Disclosure of Invention
The invention provides an NS3306 high-temperature alloy small-caliber precise seamless tube and a manufacturing method thereof, and the tube has the advantages of high dimensional precision, high purity and structural stability and good mechanical property.
In order to achieve the purpose, the invention adopts the following technical scheme:
the NS3306 high-temperature alloy small-caliber precise seamless tube is characterized by comprising the following components in percentage by weight: 0.02 to 0.06 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 0.50 percent of Mn, less than or equal to 0.003 percent of S, less than or equal to 0.010 percent of P, 21.5 to 23.0 percent of Cr, more than or equal to 58.0 percent of Ni, 9.0 to 10.0 percent of Mo, less than or equal to 0.040 percent of Al, less than or equal to 0.040 percent of Ti, less than or equal to 5.0 percent of Fe, 3.50 to 4.15 percent of Nb and Ta, and.
Preferably, the grain size of the seamless tube is controlled to 5.0 to 8.0, and the grain growth after brazing is not more than 4.0.
Preferably, the mechanical property of the seamless tube in a delivery state is as follows: rm (MPa) is more than or equal to 827, Rp0.2(MPa) is more than or equal to 414, and A% is more than or equal to 30.
The method for manufacturing the NS3306 high-temperature alloy small-caliber precise seamless pipe is characterized by comprising the following steps of:
hot extrusion blank supply, wherein a pierced billet is supplied to a round steel bar in a hot extrusion mode;
cold deformation processing of the intermediate pipe, namely, combining large deformation cold rolling and multi-pass small deformation cold drawing on the pierced billet to form a finished pipe;
and (3) heat treatment processing, wherein the heat treatment of the cold-rolled intermediate product adopts a high-temperature annealing process, the annealing temperature is higher than 1080 ℃, the annealing after the final cold drawing adopts a protective atmosphere low-temperature bright annealing process, the annealing temperature is not higher than 1000 ℃, and the protective atmosphere is hydrogen with the purity of more than 99.9%.
Preferably, the forging bar alloy is smelted by vacuum induction smelting and protective atmosphere electroslag remelting smelting or vacuum induction smelting and vacuum consumable smelting, the forging bar is subjected to hot forging, the forging ratio is more than 4.0, the finish forging temperature is more than 800 ℃, and the forging bar is rapidly cooled after being forged.
Preferably, blanking and drilling are carried out on a forged rod, pierced billet hot extrusion is carried out on the machined pipe blank to form a pierced billet, the heating temperature of a ring furnace is 900-1050 ℃, and the heat preservation time is not less than 90 min; the primary induction heating temperature is 1100-.
Preferably, the hot-extruded pierced billet is subjected to straightening, pipe cutting, pickling and cleaning.
Preferably, after the heat treatment, the surface of the seamless pipe is subjected to belt polishing treatment, the maximum mesh number of the polishing abrasive belt is not less than 400 meshes, and the surface roughness Ra is not more than 0.80 um.
Preferably, in the cold deformation processing step of the intermediate pipe, the cold rolling single-pass deformation is 40-80%, and the cold drawing single-pass deformation is 10-30%.
In summary, compared with the prior art, the invention has the advantages that: the seamless tube has the advantages of high dimensional precision, good surface quality, high purity and structural stability, good mechanical property and the like.
Drawings
FIG. 1 is a typical forged bar head edge inclusion topography and distribution map;
FIG. 2 is a typical forged bar trailing edge inclusion topography and distribution map;
FIG. 3 is a graph of the inclusion morphology and distribution at a radius of a typical forging bar head 1/2;
figure 4 is a graph of the morphology and distribution of inclusions at the radius of the tail 1/2 of a typical forged rod.
Detailed Description
The present invention will be further described with reference to the following examples.
The alloy seamless tube of the invention has the following design concept of alloy components:
the carbon content of C is controlled to be 0.02-0.06%, the Cr content is controlled to be 21.5-23.0%, and the Cr content is preferably 21.5-22.5%, so that the alloy has better corrosion resistance and structural stability, and certain mechanical properties are simultaneously considered.
Mo has the effect of solid solution strengthening, can obviously improve the high-temperature strength of the stainless steel, and preferably has the Mo content of 9.0-10.0% for ensuring that the finished pipe has better high-temperature mechanical property and durability; nb + Ta contributes to inhibiting coarsening of crystal grains and improving the high-temperature creep property of the stainless steel, and the preferable range is 3.50-4.15%.
The existence of S has great influence on the welding performance and the mechanical property of the seamless pipe, the P element reduces the corrosion resistance and the high-temperature strength of the seamless pipe, influences the high-temperature brazing precision in the installation process and the stability under the high-temperature and high-pressure working condition, and ensures that the finished pipe has better high-temperature elongation and high-temperature durability, the S content is less than or equal to 0.003 percent, and the P content is less than or equal to 0.010 percent.
The alloy composition after design is shown in table 1.
TABLE 1 NS3306 alloy composition (wt%) after optimization design
The design idea of the purity and the structure stability of the alloy seamless tube is as follows: the alloy seamless pipe has poor working condition, bears alternating stress impact at high temperature for a long time, and easily generates micro cracks near large-particle inclusions to cause the failure and the breakage of the pipe to generate explosion. In the installation process of delivered products, a vacuum high-temperature brazing process is needed, the temperature is up to over 1100 ℃, the heat preservation time is over 30min, the structure stability can not meet the requirement, the grain size after brazing is abnormal and thick, and the delivered pipes and the service pipes have larger difference, so that the performance of the actually used pipes is deteriorated. In the service process, because the condensation spots are not uniform, the local temperature of the outer surface of the pipe can exceed 800 ℃ and even reach more than 1000 ℃, the local structure is easy to be changed into abnormal and thick, and further the pipe is directly failed. Therefore, the seamless tube is required to have a grain size of 5.0 to 8.0 in a run-up state, to have a grain size of not more than 4.0 after brazing, and to have no allowance for the presence of abnormally coarse grains.
The design idea of the pure mechanical property of the alloy seamless pipe is as follows: under the working condition of 700 plus 800 ℃, the inner surface of the tube still needs to bear the alternating stress impact of about 20MPa, so the mechanical property index of the delivery state meets Rm (MPa) being more than or equal to 827, Rp0.2(MPa) being more than or equal to 414, and A% being more than or equal to 30.
The determination of the contents of the chemical components, the purity, the tissue stability and the design of the mechanical property are all obtained by creative labor of the inventor. The chemical components, the grain size and the mechanical property play a synergistic role, so that the high-temperature alloy small-caliber precise seamless tube can meet the requirements on installation high-temperature brazing precision, high-temperature, high-pressure endurance strength, high-temperature oxidation resistance and mechanical property under the use working condition, and can meet the requirements on the working condition pressure of the heat-collecting disc high-temperature alloy precise tube of about 20MPa, the normal working temperature range of 600-800 ℃ and local higher temperature.
Example one
The specification of a NS3306 high-temperature alloy small-caliber precise seamless tube target product is phi 4.5 x 0.75mm, and the manufacturing method comprises the following steps:
(1) smelting and hot working
The alloy composition (wt%) is shown in table 2.
Table 2 example an alloy composition (wt%)
The raw material is smelted by adopting a method of vacuum induction and electroslag remelting, and is formed after hot forging. The nominal specification of the forged rod is phi 207mm, the actual forging ratio is 4.42, the finish forging temperature is 830 ℃, and the forged rod is rapidly cooled after being forged.
And (3) taking samples from two ends of the finished forged bar, which are equivalent to the head and the tail of the steel ingot, and detecting chemical components according to GB/T11170, wherein the detection results can meet the requirements of chemical component control.
And sampling at the edge corresponding to the head and the tail of the electroslag ingot and the radius of 1/2 on the finished bar material of each furnace to detect longitudinal non-metallic inclusions, wherein the rating of the non-metallic inclusions is performed according to the GB/T10561 standard A method. Typical 100-fold photographs of inclusions are shown in FIGS. 1 to 4, and the results of rating the non-metallic inclusions are shown in Table 3, wherein A, B, C, D-type inclusions in the thin system of the forged bar are all not more than 0.5 grade, Nb (C, N) in the thin system of B is not more than 3.0 grade, Nb (C, N) in the thin system of D is not more than 0.5 grade, and the inclusions are not present in a thick and thin form, and the inclusions are controlled to be low in content and dispersed.
TABLE 3 rating of non-metallic inclusions in forged bars
And (3) blanking and drilling the bar material (phi 204mm) which is qualified by detection, machining the end face, wherein the surface of the blank has no obvious defects such as pits, collision damage and the like, and the transition part of the perforation is smooth. And carrying out pierced billet hot extrusion on the machined pipe blank.
Heating in a circular furnace at 950 deg.C for 95 min; the primary induction heating temperature is 1170 ℃, and the secondary induction heating temperature is 1180 ℃. The inner and outer surfaces are lubricated fully and uniformly by glass lubricant before reaming and extrusion.
And (4) carrying out finishing treatment such as straightening, pipe cutting, acid washing, cleaning and the like on the pierced billet subjected to hot extrusion. The surface defects of the pierced billet can be removed through local grinding, and the surface defects influencing the subsequent cold rolling quality are avoided.
(2) Cold working
The process of multi-pass large-deformation cold rolling and three-pass small-deformation cold drawing is adopted, and the cold-working deformation passes are detailed in the following table 4. Considering that the wall thickness of the subsequent cold drawing is increased, the wall thickness of the cold-rolled intermediate pipe before the first cold drawing is controlled to be 0.63mm, and the target value is 0.62 mm.
TABLE 4 Cold work deformation pass
The inner surface and the outer surface of the rolling mill are lubricated fully during the rolling process, the quality inspection of the outer surface is carried out one by one during the rolling process, and the inner surface and the outer surface are free from rolling defects such as cracks, folding, rolling damage, indentation and the like. The size control requirement of the finished product pipe is as follows: the outer diameter and the tolerance are 4.5 +/-0.02 mm, and the wall thickness and the tolerance are 0.75 +/-0.05 mm.
Three times of continuous drawing are adopted, the diameter is 6.35mm to 5mm to 4.5mm, the wall thickness can be thickened by about 0.10 to 0.12mm, and the wall thickness and the tolerance of the finished product are ensured to be within the range of 0.75 +/-0.05 mm. For the intermediate tube of phi 5 multiplied by 0.73mm, the length of a single branch before drawing is 3.0m, and the surface quality after drawing is good. The cold drawing die with the thickness of 4.48mm is adopted, and the wall thickness of the drawn finished pipe is 4.50mm, so that the requirements of technical conditions are met. In the drawing process, the good lubrication of the surface of the pipe is ensured, the surface of the tool and the die which are in contact with the pipe is fully lubricated, the metal deformation is uniform, the energy consumption is reduced, the wall thickness unevenness of the pipe is reduced, the surface quality of the pipe is improved, and the service life of the tool and the die is prolonged.
(3) Thermal treatment
The annealing of the first two cold rolling intermediate products is carried out by adopting a roller hearth type natural gas continuous furnace, the furnace chamber atmosphere is in weak oxidizing atmosphere, and circulating water is adopted for cooling. The subsequent bright annealing of the intermediate product is carried out by adopting a protective atmosphere bright annealing furnace, a high-temperature annealing system is adopted, the temperature is 1100 ℃, the protective atmosphere is hydrogen, the purity is 99.99 percent, and the dew point of an air source is-55 ℃. In the intermediate heat treatment process, the solid solution is sufficient, the structure is uniform, and the grain size is controlled to be about 5.0-6.0 grade. And finally, annealing after small-deformation cold drawing adopts a protective atmosphere low-temperature bright annealing process, the annealing temperature is 860 ℃, and the protective atmosphere is hydrogen with the purity of 99.99 percent, so that the finished pipe has high mechanical property, the oxidation and discoloration phenomena of the inner surface and the outer surface of the pipe are avoided, and the pipe has good surface quality.
(4) Surface treatment
And (4) carrying out surface belt polishing treatment on the finished product pipe after annealing and straightening, wherein the maximum mesh number of a polishing abrasive belt is 400 meshes, and the surface roughness Ra is less than or equal to 0.80 um.
Example two
The specification of a NS3306 high-temperature alloy small-caliber precise seamless tube target product is phi 4.5 x 0.75mm, and the manufacturing method comprises the following steps:
(1) smelting and hot working
The alloy composition (wt%) is shown in table 5.
TABLE 5 example two alloy composition (wt%)
The raw material smelting method is the same as the first embodiment, the pierced billet is subjected to hot extrusion processing, the heating temperature of the annular furnace is 1000 ℃, and the heat preservation time is 90 min; the primary induction heating temperature is 1190 ℃, and the secondary induction heating temperature is 1200 ℃. The inner and outer surfaces are lubricated fully and uniformly by glass lubricant before reaming and extrusion.
And (4) carrying out finishing treatment such as straightening, pipe cutting, acid washing, cleaning and the like on the pierced billet subjected to hot extrusion. The surface defects of the pierced billet can be removed by local grinding, so that the surface defects influencing the subsequent cold rolling quality are avoided
(2) Cold working
The same as the first embodiment.
(3) Thermal treatment
The annealing of the first two cold rolling intermediate products is carried out by adopting a roller hearth type natural gas continuous furnace, the furnace chamber atmosphere is in weak oxidizing atmosphere, and circulating water is adopted for cooling. The subsequent bright annealing of the intermediate product is carried out by adopting a protective atmosphere bright annealing furnace, a high-temperature annealing system is adopted, the temperature is 1120 ℃, the protective atmosphere is hydrogen, the purity is 99.99 percent, and the dew point of an air source is-50 ℃. In the intermediate heat treatment process, the solid solution is sufficient, the structure is uniform, and the grain size is controlled to be about 5.0-6.0 grade. And finally, annealing after small-deformation cold drawing adopts a protective atmosphere low-temperature bright annealing process, the annealing temperature is 800 ℃, and the protective atmosphere is hydrogen with the purity of 99.99 percent, so that the finished pipe has high mechanical property, the oxidation and discoloration phenomena of the inner surface and the outer surface of the pipe are avoided, and the pipe has high surface quality.
(4) Surface treatment
And (4) carrying out surface belt polishing treatment on the finished product pipe after annealing and straightening, wherein the maximum mesh number of a polishing abrasive belt is 450 meshes, and the surface roughness Ra is less than or equal to 0.80 um.
The detection of the coarse-grained structure and the mechanical property of the finished product tube meet the requirements.
EXAMPLE III
The specification of a NS3306 high-temperature alloy small-caliber precise seamless tube target product is phi 4.5 x 0.75mm, and the manufacturing method comprises the following steps:
(1) smelting and hot working
The alloy composition (wt%) is shown in Table 6.
TABLE 6 example Trialloy composition (wt%)
The raw material smelting method is the same as the first embodiment, the pierced billet is hot extruded, the heating temperature of the annular furnace is 1030 ℃, and the heat preservation time is 95 min; the primary induction heating temperature is 1200 ℃, and the secondary induction heating temperature is 1220 ℃. The inner and outer surfaces are lubricated fully and uniformly by glass lubricant before reaming and extrusion.
And (4) carrying out finishing treatment such as straightening, pipe cutting, acid washing, cleaning and the like on the pierced billet subjected to hot extrusion. The surface defects of the pierced billet can be removed by local grinding, so that the surface defects influencing the subsequent cold rolling quality are avoided
(2) Cold working
The same as the first embodiment.
(3) Thermal treatment
The annealing of the first two cold rolling intermediate products is carried out by adopting a roller hearth type natural gas continuous furnace, the furnace chamber atmosphere is in weak oxidizing atmosphere, and circulating water is adopted for cooling. The subsequent bright annealing of the intermediate product is carried out by adopting a protective atmosphere bright annealing furnace, a high-temperature annealing system is adopted, the temperature is 1100 ℃, the protective atmosphere is hydrogen, the purity is 99.99 percent, and the dew point of an air source is-50 ℃. In the intermediate heat treatment process, the solid solution is sufficient, the structure is uniform, and the grain size is controlled to be about 5.0-6.0 grade. And finally, annealing after small-deformation cold drawing adopts a protective atmosphere low-temperature bright annealing process, the annealing temperature is 900 ℃, and the protective atmosphere is hydrogen with the purity of 99.99 percent, so that the finished pipe has high mechanical property, the oxidation and discoloration phenomena of the inner surface and the outer surface of the pipe are avoided, and the pipe has high surface quality.
(4) Surface treatment
And (4) carrying out surface belt polishing treatment on the finished product pipe after annealing and straightening, wherein the maximum mesh number of a polishing abrasive belt is 500 meshes, and the surface roughness Ra is less than or equal to 0.80 um.
The detection of the coarse-grained structure and the mechanical property of the finished product tube meet the requirements.
The above description is only for explaining the present invention and making the present invention complete, but not limiting the present invention, and the skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, and these are all modifications without inventive contribution, but are protected by patent laws within the scope of the claims of the present invention.
Claims (7)
1. The NS3306 high-temperature alloy small-caliber precise seamless tube is characterized in that the seamless tube requires the grain size in the delivery state to be controlled between 5.0 and 8.0 grades, the grain growth after brazing is not more than 4.0 grades, and the existence of abnormal coarse grains is not allowed; the mechanical property index of the delivery state meets the conditions that Rm is more than or equal to 827 MPa, Rp0.2 is more than or equal to 414MPa, and A% is more than or equal to 30; the seamless tube comprises the following components in percentage by weight: 0.02 to 0.06 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 0.50 percent of Mn, less than or equal to 0.003 percent of S, less than or equal to 0.010 percent of P, 21.5 to 22.5 percent of Cr, more than or equal to 58.0 percent of Ni, 9.0 to 10.0 percent of Mo, less than or equal to 0.040 percent of Al, less than or equal to 0.040 percent of Ti, less than or equal to 5.0 percent of Fe, 3.50 to 4.15 percent of Nb and Ta, and.
2. The method for manufacturing NS3306 superalloy small-caliber precision seamless pipe according to claim 1, wherein the method for manufacturing NS3306 superalloy small-caliber precision seamless pipe comprises the following steps:
hot extrusion blank supply, wherein a pierced billet is supplied to a round steel bar in a hot extrusion mode;
cold deformation processing of the intermediate pipe, namely, combining large deformation cold rolling and multi-pass small deformation cold drawing on the pierced billet to manufacture a finished pipe;
and (3) heat treatment processing, wherein the heat treatment of the cold-rolled intermediate product adopts a high-temperature annealing process, the annealing temperature is higher than 1080 ℃, the annealing after the final cold drawing adopts a protective atmosphere low-temperature bright annealing process, the annealing temperature is not higher than 1000 ℃, and the protective atmosphere is hydrogen with the purity of more than 99.9%.
3. The method for manufacturing the NS3306 superalloy small-caliber precision seamless tube according to claim 2, wherein: the used forged bar alloy adopts a smelting mode of vacuum induction smelting and protective atmosphere electroslag or vacuum induction smelting and vacuum self-consumption, the forged bar is finished by hot forging, the forging ratio is more than 4.0, the finish forging temperature is more than 800 ℃, and the forged bar is rapidly cooled after being finished.
4. The method for manufacturing the NS3306 superalloy small-caliber precision seamless tube according to claim 2, wherein: blanking and drilling a forged rod, carrying out pierced billet hot extrusion on the machined tube blank to form a pierced billet, heating the tube billet in an annular furnace at 950-1030 ℃, and keeping the temperature for not less than 90 min; the primary induction heating temperature is 1100-.
5. The method for manufacturing the NS3306 high-temperature alloy small-caliber precise seamless tube according to claim 4, wherein the method comprises the following steps: and (4) straightening, pipe cutting, acid washing and cleaning the pierced billet after hot extrusion.
6. The method for manufacturing the NS3306 superalloy small-caliber precision seamless tube according to claim 2, wherein: after the heat treatment processing, the surface of the seamless pipe is subjected to belt type polishing treatment, the maximum mesh number of a polishing abrasive belt is not less than 400 meshes, and the surface roughness Ra is not more than 0.80 um.
7. The method for manufacturing the NS3306 superalloy small-caliber precision seamless tube according to claim 2, wherein: in the cold deformation processing step of the intermediate pipe, the cold rolling single-pass deformation is 40-80%, and the cold drawing single-pass deformation is 10-30%.
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| CN111187933B (en) * | 2019-12-27 | 2021-09-17 | 国机金属江苏有限公司 | Method for manufacturing UNS N06617 small-caliber pipe |
| CN111636013A (en) * | 2020-06-12 | 2020-09-08 | 江苏银环精密钢管有限公司 | Novel nickel-chromium-cobalt-molybdenum high-temperature alloy seamless tube for power station and manufacturing method |
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| CN112845659B (en) * | 2021-01-05 | 2022-09-16 | 太原科技大学 | A kind of preparation method of UNS N06600 small diameter precision seamless pipe |
| CN113061783A (en) * | 2021-03-23 | 2021-07-02 | 江苏图南合金股份有限公司 | High-temperature alloy seamless special pipe and production method thereof |
| CN114293067B (en) * | 2021-12-27 | 2023-03-31 | 上海康晟航材科技股份有限公司 | High-temperature alloy for electronic firework push rod and preparation process and application thereof |
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| CN102463272A (en) * | 2010-11-08 | 2012-05-23 | 北京有色金属研究总院 | Short-process preparation method of small-caliber nickel-based alloy thin-wall pipe |
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