CN115008141A - Casting-rolling manufacturing method of brass pipe and brass pipe - Google Patents
Casting-rolling manufacturing method of brass pipe and brass pipe Download PDFInfo
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- CN115008141A CN115008141A CN202210936115.6A CN202210936115A CN115008141A CN 115008141 A CN115008141 A CN 115008141A CN 202210936115 A CN202210936115 A CN 202210936115A CN 115008141 A CN115008141 A CN 115008141A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 127
- 229910001369 Brass Inorganic materials 0.000 title claims abstract description 119
- 239000010951 brass Substances 0.000 title claims abstract description 119
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000009749 continuous casting Methods 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000003801 milling Methods 0.000 claims abstract description 7
- 238000011282 treatment Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 40
- 238000001953 recrystallisation Methods 0.000 claims description 14
- 238000009785 tube rolling Methods 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 19
- 239000002184 metal Substances 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000010583 slow cooling Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 13
- 229910052802 copper Inorganic materials 0.000 description 13
- 239000010949 copper Substances 0.000 description 13
- 239000000047 product Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to the technical field of metal pipe processing, in particular to a casting-rolling manufacturing method of a brass pipe and the brass pipe, which comprises the following steps: s1, directly air-cooling the tube blank out of the continuous casting crystallizer, and cooling the tube blank to room temperature from a red hot state to obtain a brass tube blank; s2, performing surface milling on the brass pipe blank treated in the step S1 to obtain an oxidation-free surface; s3, feeding the brass pipe blank into a planetary pipe mill for single-pass rolling, and cooling to obtain a brass coil pipe after rolling; s4, carrying out any one or combination of a plurality of subsequent treatments of stretching, forming, annealing or finishing on the brass tube to obtain a finished brass tube; the invention combines the slow cooling technology after continuous casting with the planetary rolling technology, has the advantages of high efficiency, energy saving, high yield, low pipe manufacturing cost, good quality of finished pipes and the like, can produce high-quality brass pipes, and greatly improves the production efficiency and yield of the brass pipes.
Description
Technical Field
The invention relates to the technical field of metal pipe processing, in particular to a casting-rolling manufacturing method of a brass pipe and the brass pipe.
Background
In the prior art, the manufacturing method of the brass tube mainly comprises an extrusion method and a casting and rolling method.
One is the "extrusion method" of the brass pipe, its technological process is: semi-continuous casting, extrusion, cold rolling by a pilger mill, drawing, heat treatment and packaging.
The processing method has the following problems: the extruded pipe often does not meet the final dimension requirement, and a pilger mill or a drawbench is needed for reducing the diameter and the wall. This process is a cold working, either cold rolling or cold drawing. However, the metal strength is high during cold processing, and the deformation resistance is greatly higher than that of metal hot processing, so that compared with the hot processing, the single-pass deformation rate of the cold processing is low, the production efficiency of products is low, and the same metal deformation can be completed by processing passes which are often multiple times of that of the hot processing; in addition, "extrusion-pilger rolling" is straight pipe production, and it is generally difficult to process ultra-long pipes, and unless an ultra-large tonnage extruder is used, it is difficult to use a disc-drawing production mode with extremely high efficiency, which is one of the factors affecting the production efficiency. The extrusion method adopts cold processing too much, which causes the problems of low production efficiency, low yield, high cost and the like, and is the biggest problem in the production of brass tubes.
In another document, the patent No. CN88101739 entitled "method for producing tubes, rods and strips", discloses a new method for producing copper tubes, the so-called "cast rolling method". The method is to directly send the continuous casting hollow copper billet tube into a PSW three-roller planetary rolling mill at room temperature for single-pass rolling with large deformation. The area reduction of the copper pipe blank and the internal friction generated by the deformation of the material are utilized to lead the copper pipe blank to carry out the processing and rolling of the copper pipe under the condition of heating to 250 ℃ to 700 ℃ (namely the temperature is higher than the recrystallization starting temperature of the corresponding material). Compared with the extrusion method, the casting and rolling method has the advantages of less working procedures, low cost, high yield and the like. The method has achieved great success in the field of copper tube processing within the last 20 years.
Referring to the great success of the "cast-rolling method" on the copper tube, engineers in the field hope to popularize the method in the copper alloy tube processing field, and hope to manufacture various copper alloy tubes by rolling cast hollow copper alloy tube blanks such as brass, bronze, cupronickel and the like through a planetary tube rolling mill. For this reason, a lot of works such as local or whole heating before rolling a cast copper alloy hollow shell, electromagnetic stirring of the cast shell during casting to refine crystal grains, controlling the biting parameters at the start of rolling by a rolling mill, and the like have been made, and patent documents with patent numbers "CN 02138022", "CN 03149786", "CN 200410010338", "CN 200510134628", "CN 200910153349", and "CN 201010224476" have recorded the works and assumptions of engineers.
However, the production of brass tubes by the "cast rolling" method has not been successful to date, and the specific reasons are as follows:
1. compared with red copper, the continuously cast hollow brass tube has the defects that the grain boundary is easy to crack due to coarse grains during rolling, a stable rolling state is difficult to establish, the components of the rolled structure are uneven, and the inner surface and the outer surface have more crack defects.
The cast structure of the brass shell contains various defects such as cracks, shrinkage cavities, segregation, and the like, and these defects may be repaired or retained or enlarged in the subsequent working process. When the 'cast-rolling method' is used for producing the red copper tube, various defects on the cast tube blank are completely repaired and welded in a deformation zone at high temperature and high pressure through planetary rolling with large rolling reduction, and a novel copper tube manufacturing method is formed. When the same method is applied to rolling of brass tubes, the brass tube blanks are very susceptible to cracking during rolling due to the grain boundaries of coarse columnar grains, and stable rolled states cannot be established. Although brass pipe blanks have been subjected to methods such as blank heating in advance, many defects are present after the brass pipe is rolled due to grain boundary cracking during rolling. This is the main reason why brass tubes have not been successfully manufactured by the "cast-rolling" method. Measures such as electromagnetic stirring are adopted during continuous casting to help the reduction of cracking, but the cracking problem cannot be fundamentally solved, and the cost is greatly increased.
2. The deformation rate and temperature rise of the brass are insufficient when planetary rolling is carried out, so that the manufacturing defects exist.
Compared with red copper, brass has greater resistance to deformation and lower plasticity. When planetary rolling is adopted, the deformation rate and temperature rise which are as high as those of red copper are difficult to achieve, and the temperature of a deformation area is difficult to stabilize. In order to improve the performance of the rolling mill, the rolling specification is much smaller than that of red copper when brass is rolled, but the rolling temperature is insufficient, and defects generated in the tube blank and the rolling process cannot be welded and eliminated in a deformation area.
3. The brass has a hot working brittleness which is at 400-600 ℃, while the temperature of the deformation zone of the planetary rolling mill is continuously distributed from the room temperature at the inlet to the high temperature at the outlet, and the defects generated in the brittleness temperature zone can exist all the time if the welding can not be obtained before the deformation is finished.
So far, the problem of the processing defects of the brass tube, particularly the high-zinc brass, is not well solved, and a technology for processing the brass tube, which has the advantages of few working procedures, high yield, high production efficiency, good tube quality, simplicity and easiness, is found, and is a technical problem to be solved urgently.
Disclosure of Invention
The purpose of the invention is: the method combines continuous casting and planetary rolling, fully utilizes the continuous casting waste heat to eliminate the residual casting stress, and has the advantages of less working procedures, high yield, high production efficiency, obvious energy conservation, low manufacturing cost, stable quality of pipe products and the like.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a cast-rolling manufacturing method of brass tubes, comprising the following steps:
s1, directly air-cooling the tube blank out of the continuous casting crystallizer, controlling the surface temperature to be 600-850 ℃ when the tube blank is out of the continuous casting crystallizer, and cooling the tube blank to room temperature from a red hot state to obtain a brass tube blank;
s2, performing surface milling on the brass pipe blank obtained after the brass pipe blank is processed in the step S1 to obtain an oxidation-free surface;
s3, feeding the brass pipe blank into a planetary pipe mill for single-pass rolling, controlling the rolling speed, the reduction of area and the cooling strength during rolling to keep the rolling temperature of the brass pipe blank in the planetary pipe mill above the dynamic recrystallization temperature of the brass, and cooling after rolling to obtain a brass coil pipe;
s4, the brass tube is subjected to any one or more of post-treatment of stretching, forming, annealing or finishing, and a finished brass tube is obtained.
Further, the thickness of the tube wall of the brass tube blank in the step S1 is 10 mm-40 mm.
Furthermore, the size of the tube blank after the continuous casting crystallizer is discharged from the step S1 and cooled to room temperature is phi 90 x 25 mm-phi 100 x 25mm, and the size of the milled surface in the step S2 is phi 89 x 24.5 mm-phi 98 x 24 mm.
Further, in the step S3, an inert gas is used for protection during the rolling process.
Further, the rolling temperature is controlled to be 700-850 ℃, and the planetary tube rolling mill is a 3-4-roller planetary tube rolling mill.
Further, the rolling speed in the step S3 is 10m/min to 25m/min, and the reduction of area is 50 to 95%.
Further, the cooling in step S3 is rapid cooling or natural cooling at room temperature.
Further, in the step S3, the rapid cooling is performed by using an emulsion or water, and the rapid cooling is achieved within a time of 3.5 ± 2S.
Further, the step S1 of cooling to room temperature in the red hot state specifically includes: and after the tube blank is discharged from the continuous casting crystallizer, the tube blank is naturally cooled to room temperature through a heat preservation sleeve with the diameter of 1.5 +/-0.3 m.
Another object of the invention is: provides a brass pipe prepared by combining two methods of continuous casting and planetary rolling. The brass tube has excellent quality, is suitable for subsequent reprocessing treatment without annealing, and can be made into high-quality brass finished tubes with different specifications.
The technical scheme adopted by the invention has the beneficial effects that:
1. can produce high-quality brass tubes.
The brass tube is widely applied in various industries.
The method of the invention fully combines the advantages of two processing methods of continuous casting and planet rolling and can manufacture the brass pipe with high quality.
The brass tube blank slowly cooled after continuous casting does not crack between crystals during rolling, and the defects of the tube blank after rolling are extremely low when the tube blank is used for rolling by a planetary tube mill.
After continuous casting, slow cooling can eliminate or reduce segregation phenomenon in a brass casting blank, and then planetary hot rolling enables the rolled structure to have a dynamic recrystallization structure. The structure is particularly suitable for the wall reduction and the diameter reduction processing of the subsequent pass, and the high-quality final product is easier to obtain. In contrast, the traditional extrusion method performs pilger cold rolling after extrusion, and the rolled structure is a work hardening structure which is difficult to process.
2. High efficiency, energy saving, low cost and disc type production.
The horizontal continuous casting and the planetary tube rolling both have high production efficiency, and the horizontal continuous casting, the planetary tube rolling mill and the disc drawing mill are combined to manufacture the brass coil pipe with large ingot weight. The disc type production can achieve high production efficiency, high yield and low cost. The work hardening in the processing can be carried out in a disc-to-disc mode by adopting induction annealing, so that the efficiency and the energy are high.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A cast-rolling manufacturing method of brass tubes, comprising the following steps:
s1, directly air-cooling the tube blank out of the continuous casting crystallizer, controlling the surface temperature to be 600-850 ℃ when the tube blank is out of the continuous casting crystallizer, and cooling the tube blank to room temperature from a red hot state to obtain a brass tube blank;
s2, performing surface milling on the brass pipe blank obtained after the brass pipe blank is processed in the step S1 to obtain an oxidation-free surface;
s3, feeding the brass pipe blank into a planetary pipe mill for single-pass rolling, controlling the rolling speed, the reduction of area and the cooling strength during rolling to keep the rolling temperature of the brass pipe blank in the planetary pipe mill above the dynamic recrystallization temperature of the brass, and cooling after rolling to obtain a brass coil pipe;
s4, the brass tube is subjected to any one or more of post-treatment of stretching, forming, annealing or finishing, and a finished brass tube is obtained.
In the technical scheme, a brass pipe blank (which can be horizontally, upward continuous casting or downward continuous casting) is continuously cast, and the pipe blank is not subjected to conventional water cooling after being taken out of a continuous casting crystallizer, so that the brass pipe blank is gradually cooled to room temperature in a high-temperature red-hot state as far as possible. And then, carrying out surface milling treatment on the surface of the brass pipe blank to obtain a smooth and non-oxidized outer surface. And then, carrying out single-pass planetary rolling with large deformation on the brass pipe blank to obtain the brass coil. The invention can effectively save energy, reduce cost, reduce processing procedures and improve production efficiency; performing single-pass rolling by using a planetary tube mill, and controlling the rolling temperature by controlling the rolling speed and the reduction of area so as to realize high-quality rolling of the brass tube blank; after rolling, different subsequent treatments are carried out according to different materials of the tube blank, thereby obtaining a high-quality finished product.
In the step S3, inert gas is used for protection during the rolling process.
And (4) performing inert gas protection to prevent oxidation in the rolling process and further ensure the quality of a finished product.
The control of the temperature of 600-850 ℃ of the brass pipe blank when the brass pipe blank is taken out of the continuous casting crystallizer ensures that the continuous casting residual stress is completely eliminated in the process of cooling the continuous casting billet to the room temperature, and is the key for ensuring that no defect is generated during rolling. Those skilled in the art know that: the heated red state of the object is called red hot state, and in the invention, the heat preservation measure is adopted for the pipe blank which is taken out of the crystallizer during continuous casting, so that the red hot state is kept for a long time, and the method is also an effective means for eliminating continuous casting stress. Also, after the conventional continuous casting, the tube blank is sent to a reheating furnace to be annealed at the temperature of 700-800 ℃ as an effective means for eliminating the residual stress, but this leads to an increase in the production cost.
In step S3, the rolling temperature of the brass blank tube in the planetary tube mill is maintained above the recrystallization temperature of the brass by controlling the rolling speed, the reduction of area, and the cooling intensity during rolling.
The rolling temperature has important influence on the processing quality of the tube blank, the rolling temperature of the tube blank can be ensured to be higher than the recrystallization temperature of the tube blank by controlling the rolling speed, the reduction of area and the cooling strength during rolling, the dynamic recrystallization of a deformation area is ensured, and a complete recrystallization structure is obtained after rolling.
In step S3, the emulsion is used for cooling during rolling; controlling the rolling temperature to be between 700 ℃ and 850 ℃; the planetary pipe mill is a 3-4 roller planetary pipe mill.
In order to maintain the rolling temperature (the highest temperature of the metal in the rolling deformation zone is the rolling temperature of the metal) above the recrystallization temperature of the brass, the cooling strength needs to be controlled in the rolling process, a 3-4-roller planetary tube mill is adopted to roll the brass tube blank in a single-pass large reduction amount, and the rolling temperature is controlled between 700 ℃ and 850 ℃, so that the temperature control range is better.
In step S3, the pipe after single-pass rolling by the planetary pipe mill is rapidly cooled or naturally cooled at room temperature.
Can carry out follow-up processes such as dish drawing, packing after the cooling, on the modern production line of serialization, for improving production efficiency, generally all be provided with the cooling bath, cool off fast to the pipe fitting that goes out the pipe mill, and adopt water bath cooling, with low costs, pollution-free mostly.
In summary, the manufacturing method of the present invention has the following main features:
first, a thick-walled tube blank with very low residual stress can be continuously cast.
And (3) gradually cooling the continuously cast hollow brass blank from a red hot state to room temperature in air, so as to obtain a thick-wall brass pipe blank with very small residual stress. The thick-wall brass tube is suitable for single-pass large-deformation rolling of a planetary tube mill in the subsequent pass in size, can obtain larger single tube blank weight, can produce an ultralong tube, and can improve the processing efficiency.
Because the continuous casting pipe blank has long time in a red hot state, crystal grains crystallized in the continuous casting crystallizer can grow freely, residual stress among the crystal grains during crystallization is eliminated, and a large number of crystal boundaries caused by fine crystal grains are also eliminated. It is known that grain boundaries between crystal grains are where casting defects are concentrated and also are regions where impurities are collected. As a result, the grain boundary cracking probability of the tube blank during subsequent rolling is greatly reduced.
Secondly, single-pass large-deformation rolling is carried out by adopting a planetary pipe mill.
And (3) carrying out single-pass rolling with large reduction on the continuously cast thick-wall tube blank by adopting a planetary tube rolling mill with 3-4 rollers, and controlling the rolling temperature to be between 700 and 850 ℃ by controlling the reduction of area, the rolling speed and the cooling strength during tube blank rolling.
The planetary pipe mill is a pipe mill with large rolling reduction, and the single-pass reduction of area can reach 70-95%. Such large single pass deformation can generate considerable heat of deformation, raising the temperature of the metal being rolled above its dynamic recrystallization temperature in the deformation zone, resulting in what is known as hot rolling. To ensure dynamic recrystallization of the rolled metal, the rolling temperature of the rolled metal in the deformation zone should exceed the metal recrystallization initiation temperature, which for brass alloys is typically in the range of 700 ℃ to 850 ℃. Considering the factors of both the desire to obtain a better recrystallized structure and the avoidance of the hot brittle temperature of brass, the ideal range of rolling temperature should be between 750 ℃ and 850 ℃ and this temperature range varies according to the specific grade of brass, reaching this temperature interval being an important guarantee of good performance of the rolled pipe.
The invention sends the thick-walled tube blank which is obtained by air-cooling the brass continuous casting in the red hot state to the room temperature into the planetary tube mill for single-pass rolling, the single-pass rolling with large reduction of the planetary tube mill can cause the rolled tube blank to generate sharp temperature rise in a deformation zone, and the higher the reduction is, the higher the rolling speed is, and the higher the temperature rise is. In order to maintain the ideal rolling temperature in the deformation zone, the deformation zone is generally cooled by spraying water or emulsion, and the inlet temperature, the reduction of area, the rolling speed and the cooling strength of the tube blank are controlled, so that the temperature in the tube deformation zone is stabilized within the range of 700 ℃ plus 850 ℃, the rolled metal has lower deformation resistance and better ductility, intergranular cracking does not occur on the inner surface of the tube blank, and the rolled tube has good recrystallization texture, so that the final product has good mechanical properties.
In addition, in order to obtain good appearance and quality of the pipe, the pipe needs to be protected by inert gas such as nitrogen.
Thirdly, the brass tube is processed by one or more methods of subsequent drawing, annealing or forming according to market requirements to form a marketable finished product.
The method for manufacturing brass tubes of the present invention is described below with reference to specific production examples:
the first embodiment is as follows:
a preferred embodiment of the invention is: h65 brass tube was made. The rolling was carried out on an XR-JSG100 three-roll planetary tube mill. The temperature of the blank after being discharged from the horizontal continuous casting crystallizer is 700 ℃, the size of the blank after being air-cooled to room temperature is phi 90 multiplied by 25mm, the size of the blank after being milled is phi 89 multiplied by 24.5mm, and the blank is sent into a three-roller planetary rolling mill for rolling. The tube rolling mill works at a rolling speed of 18m/min, the temperature of a tube blank is quickly raised to about 800 ℃ after entering a deformation zone, namely the rolling temperature is about 800 ℃, a rolled brass tube continuously enters an emulsion bath with the length of about 2m, the rolled tube passes through the emulsion bath within about 3.5 seconds to realize quick cooling, and then the tube is bent upwards to form a coil to form a suspension coil. The specification of the rolled brass tube is phi 48 multiplied by 2.3mm, the reduction of area is 93.3%, the inner and outer surfaces of the manufactured tube have no fold lines and other defects, and the tensile strength and the elongation are 320 MPa-350 MPa and 25% -30% respectively. The rolled tube can be stretched without intermediate annealing to a phi 25 x 1.5mm coil. The finished product is subjected to eddy current inspection, and the result shows that the number of defect points per kilometer is only less than 3. The rolled pipe has excellent quality, and the manufacture is successful.
Example two:
another preferred embodiment of the invention is: HSn70-1 brass tube was manufactured. The size of the blank after horizontal continuous casting is phi 100 multiplied by 25mm, the temperature of the blank out of the crystallizer is 700 ℃, and the blank is cooled to room temperature after passing through a 1.5m thermal insulation sleeve. The milled surface had dimensions of 98X 24mm and was subsequently introduced into an XR-JSG100 three-roll planetary tube mill. The subsequent rolling was carried out at a rolling temperature of about 810 ℃ at a rolling speed of 16m/min, and the brass tube after rolling had a specification of phi 60X 3.0mm and a reduction of area of 90.4%, as described in the above example. The inner surface and the outer surface of the manufactured brass tube have no fold lines and other defects, the tensile strength and the elongation are respectively 320 MPa-380 MPa and 25% -40%, and an electron microscope shows that the metallographic structure of the rolled tube body is compact, and the grain size is 15-40 microns. The process was successful. The brass tube is almost free from tube breakage caused by the defects of the tube body in the subsequent stretching.
Example three:
yet another preferred embodiment of the present invention is: h85 brass tube was made. The temperature of the horizontal continuous casting tube blank after being taken out of the continuous casting crystallizer is 650 ℃, and the horizontal continuous casting tube blank is directly air-cooled to the room temperature. Milling to obtain the product with a size of phi 90 × 20mm, and directly introducing into XR-JSG100 three-roller planetary tube mill under the protection of nitrogen gas for rolling. The specification of the rolled pipe fitting is phi 55 multiplied by 2.5mm, the temperature of a rolling deformation zone is 750 and 850 ℃, and the rolling speed is 20 m/min. The rolled brass tube is cooled by water, then is rolled up and received, then is directly drawn to phi 6.35 multiplied by 0.6mm in multiple passes without intermediate annealing, and finally is made into a finished product by heat treatment and annealing. The H85 brass tube produced by the process has excellent mechanical property, can be used as the material of air conditioner connecting tubes, evaporators and condensers, and can meet the requirements of users in quality.
In conclusion, the invention combines the slow cooling technology after continuous casting with the planetary rolling technology, and has the advantages of high efficiency, energy saving, high yield, low pipe manufacturing cost, good quality of finished pipes and the like. The brass tube manufactured by the method overcomes the defects and shortcomings in the prior art, can be used for producing high-quality brass tubes, and greatly improves the production efficiency and the yield of the brass tubes.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment contains only one independent claim, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. A casting-rolling manufacturing method of brass tubes is characterized in that: the method comprises the following steps:
s1, directly air-cooling the tube blank out of the continuous casting crystallizer, controlling the surface temperature to be 600-850 ℃ when the tube blank is out of the continuous casting crystallizer, and cooling the tube blank to room temperature from a red hot state to obtain a brass tube blank;
s2, performing surface milling on the brass pipe blank obtained after the brass pipe blank is processed in the step S1 to obtain an oxidation-free surface;
s3, feeding the brass pipe blank into a planetary pipe mill for single-pass rolling, controlling the rolling speed, the reduction of area and the cooling strength during rolling to keep the rolling temperature of the brass pipe blank in the planetary pipe mill above the dynamic recrystallization temperature of the brass, and cooling after rolling to obtain a brass coil pipe;
s4, the brass tube is subjected to any one or more of post-treatment of stretching, forming, annealing or finishing, and a finished brass tube is obtained.
2. A cast-rolling method for manufacturing brass tubes as claimed in claim 1, wherein: and in the step S1, the thickness of the tube wall of the brass tube blank is 10 mm-40 mm.
3. A method of cast-rolling brass pipe as defined in claim 1, wherein: and when the pipe blank is cooled to room temperature after the continuous casting crystallizer is discharged from the step S1, the size of the pipe blank is phi 90 x 25 mm-phi 100 x 25mm, and the size of the pipe blank after the surface milling in the step S2 is phi 89 x 24.5 mm-phi 98 x 24 mm.
4. A cast-rolling method for manufacturing brass tubes as claimed in claim 1, wherein: and in the step S3, inert gas is adopted for protection in the rolling process.
5. A cast-rolling method for manufacturing brass tubes as claimed in claim 1, wherein: the rolling temperature is controlled to be 700-850 ℃, and the planetary tube rolling mill is a 3-4-roller planetary tube rolling mill.
6. A cast-rolling method for manufacturing brass tubes as claimed in claim 1, wherein: the rolling speed in the step S3 is 10m/min to 25m/min, and the reduction of area is 50 to 95%.
7. A cast-rolling method for manufacturing brass tubes as claimed in claim 1, wherein: the cooling in step S3 is rapid cooling or natural cooling at room temperature.
8. The cast-rolling manufacturing method of brass tubes as claimed in claim 7, wherein: in the step S3, the rapid cooling is carried out by adopting emulsion or water, and the rapid cooling is realized within 3.5 +/-2S.
9. A cast-rolling method for manufacturing brass tubes as claimed in claim 1, wherein: the step S1 of cooling the red hot state to room temperature specifically includes: and after the tube blank is discharged from the continuous casting crystallizer, the tube blank is naturally cooled to room temperature through a heat preservation sleeve with the diameter of 1.5 +/-0.3 m.
10. Brass tube obtained by the manufacturing method as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210936115.6A CN115008141A (en) | 2022-08-05 | 2022-08-05 | Casting-rolling manufacturing method of brass pipe and brass pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210936115.6A CN115008141A (en) | 2022-08-05 | 2022-08-05 | Casting-rolling manufacturing method of brass pipe and brass pipe |
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