CN105855317A - Niobium and niobium alloy seamless tube hot rolling production and processing method - Google Patents
Niobium and niobium alloy seamless tube hot rolling production and processing method Download PDFInfo
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- CN105855317A CN105855317A CN201610412012.4A CN201610412012A CN105855317A CN 105855317 A CN105855317 A CN 105855317A CN 201610412012 A CN201610412012 A CN 201610412012A CN 105855317 A CN105855317 A CN 105855317A
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- niobium
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- heating
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- 239000010955 niobium Substances 0.000 title claims abstract description 48
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910001257 Nb alloy Inorganic materials 0.000 title claims abstract description 32
- 238000005098 hot rolling Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000003672 processing method Methods 0.000 title claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000011253 protective coating Substances 0.000 claims abstract description 21
- 238000004513 sizing Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000007689 inspection Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000009785 tube rolling Methods 0.000 claims abstract description 6
- 238000004080 punching Methods 0.000 claims abstract description 4
- 238000005488 sandblasting Methods 0.000 claims abstract description 4
- 238000005242 forging Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003870 refractory metal Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 210000000664 rectum Anatomy 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/10—Finishing, e.g. smoothing, sizing, reeling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
Abstract
The invention discloses a niobium and niobium alloy seamless tube hot rolling production and processing method. The method comprises the steps of material selection, centering hole machining, protective coating application, heating, punching, tube rolling, sizing, cooling, straightening, sawing, sand blasting, nondestructive inspection and manual checking, packing and storage. The sealed protective coating protecting technology is adopted, the online hot rolling molding technique characterized in small deformation and low rolling speed is adopted, and rolling temperature and speed are strictly controlled. The method is short in process and high in efficiency, the utilization rate of materials is increased, cost is reduced, and the method accords with the idea of saving energy and protecting the environment. The refractory metal niobium and niobium alloy is machined into a seamless tube, which is the first case in hot rolling and refractory metal deformation processing and has profound significance.
Description
Technical field
The present invention relates to a kind of niobium and niobium alloy seamless pipe hot rolling production and processing method, belong to refractory metal deformation processing technical field.
Background technology
The fusing point of niobium is up to 2468 DEG C, density 8.66g/cm2, linear expansion coefficient 7.7X10-6/ DEG C, elastic modelling quantity 113GPa, resistivity 15 μ Ω cm, thermal conductivity 52.7W/m K.There is thermal-neutron capture cross-section little, stable performance in corrosive environment, mould-the advantage such as crisp temperature transition is low, be widely used in magnetron sputtering field and superconductor applications field.Because the recrystallization temperature of niobium is high, high temperature thermal deformation drag is big, hot work hardening phenomenon is obvious, it is difficult to thermo forming, and usual hot processing temperature is more than 1300 DEG C.But niobium is vigorous oxidation in the air of 600 DEG C, therefore niobium pipe processing always world-famous puzzle.Domestic niobium and niobium alloy seamless pipe generally being used forging method and sheathed extrusion method, stock utilization is low, and cost is high, and environment can be polluted by the pickling in the course of processing.
Summary of the invention
The present invention is directed to that flow stress under oxidizable under niobium and niobic alloy high temperature, hot processing temperature is high, the problem such as temperature rise and processing hardening; provide a kind of niobium and niobium alloy seamless pipe hot rolling production and processing method; the method uses closed protective coating protection technique; use small deformation amount, the online hot-roll forming technology of the low mill speed operation of rolling; the temperature of strict controlled rolling and speed; the method not only flow process is short, efficiency is high; but also improve stock utilization; reduce cost, meet the theory of energy-conserving and environment-protective；This kind of to niobium and niobium alloy refractory metal material is processed into seamless pipe, in hot rolling technique field and refractory metal deformation processing technical field real genus the first, there is profound significance.
The present invention overcomes its technical problem be the technical scheme is that
A kind of niobium and niobium alloy seamless pipe hot rolling production and processing method, comprise the following steps that
(1) select materials: choose qualified niobium and niobium alloy rod base；
(2) processing internal point: the both ends of the surface of niobium and niobium alloy rod base are processed internal point；
(3) brushing protective coating: by niobium and the external coating protective coating of niobium alloy rod base；
(4) heating: niobium and niobium alloy rod base are put into annular furnace heating, heating-up temperature, less than more than 5 DEG C of set point of temperature, heats with the uniform speed of omnidistance 7min/cm；
(5) perforation: the niobium after heating and niobium are closed solid bar base feeding rolled by piercing mill and becomes hollow hollow billet, punching rate 0.6-0.8m/s；
(6) tube rolling: hollow hollow billet feeding pipe mill is carried out equal wall thickness, expanding, extension, obtains hollow forging；
(7) sizing: hollow forging is sent into sizing mill and determines that final diameter obtains seamless pipe, the external diameter tolerance ± 1.5mm of seamless pipe, wall thickness ± 1.2mm after sizing；
(8) cooling: use chain-type cooling bed to carry out air cooling cooling, be cooled to room temperature；
(9) aligning: use room temperature cold leveling, aligns with boiled water in straightening process, and the seamless pipe after aligning meets: every meter of flexibility≤1.0mm and the 0.15% of total length flexibility≤seamless pipe total length；
(10) sawing: seamless pipe is transported to automatic casing cutter, to its two ends cutting processing, reaches the standard-required of production tube；
(11) sandblasting: seamless pipe is carried out bead to remove surface impurity；
(12) without visiting damage: seamless pipe is carried out eddy current inspection, it is ensured that product does not has defect；
(13) hand inspection, packaging warehouse-in.
According to currently preferred, in described step (1), qualified niobium and niobium alloy rod base meet following condition: external diameter tolerance: ± 1%；Ovality: diameter tolerance ± 1mm；Length tolerance: 0 ± 50mm；End face chamfer angle :≤5mm；Flexibility: every meter is less than 6mm；Surface roughness Ra≤3.2 μm.
According to currently preferred, in described step (2), the size of internal point determines according to rod base, for the excellent base of φ 90mm-φ 180mm, and its internal point chamfering 5mm, diameter 20mm, degree of depth 20mm；For the excellent base of φ 210mm, its internal point chamfering 5mm, diameter 30mm, degree of depth 30mm.
According to currently preferred, in described step (3), first with ethanol and Electric brush of bristles cleaning bar base surface, then spraying a layer thickness is the protective coating of 0.1mm, after standing 12h, then spray the protective coating that a layer thickness is 0.2-0.25mm, put into annular furnace after 24h and heat.
According to currently preferred, in described step (4), described rod base zone heating in annular furnace, each phase temperature be respectively as follows: preheating section 750-800 DEG C, heating I section 900-950 DEG C, heating II section 1150-1200 DEG C, heating III section 1200-1250 DEG C, discharging time 1250-1280 DEG C.
According to currently preferred, in described step (5), perforating machine rolls front temperature 1190-1240 DEG C, perforation procedure temperature 1240-1270 DEG C, hollow billet temperature 1180-1230 DEG C after perforation.
According to currently preferred, in described step (6), roll front hollow billet temperature 1150-1200 DEG C, operation of rolling temperature 1170-1220 DEG C, roll rear hollow forging temperature 1140-1190 DEG C.
According to currently preferred, in described step (7), hollow forging temperature 1090-1140 DEG C before sizing, seamless pipe temperature 1050-1100 DEG C after sizing.
The invention has the beneficial effects as follows:
The method of the present invention uses closed protective coating protection technique; use small deformation amount, the online hot-roll forming technology of the low mill speed operation of rolling; the temperature of strict controlled rolling and speed; the method not only flow process is short, efficiency is high; but also improve stock utilization; reduce cost, meet the theory of energy-conserving and environment-protective；This kind of to niobium and niobium alloy refractory metal material is processed into seamless pipe, in hot rolling technique field and refractory metal deformation processing technical field real genus the first, there is profound significance.
Accompanying drawing explanation
Fig. 1 is niobium of the present invention and niobium alloy seamless pipe hot rolling production and processing process schematic diagram.
Detailed description of the invention
Being better understood from the present invention for the ease of those skilled in the art, be described in further details the present invention with specific embodiment below in conjunction with the accompanying drawings, following is only exemplary not limit protection scope of the present invention.
As it is shown in figure 1, niobium of the present invention and niobium alloy seamless pipe hot rolling production and processing method, it is characterised in that comprise the following steps that
(1) select materials: choose qualified niobium and niobium alloy rod base.Qualified niobium and niobium alloy rod base meet following condition:
External diameter tolerance: ± 1%, such as φ 90mm ± 0.9mm, φ 130mm ± 1.3mm, φ 160mm ± 1.6mm, φ 180mm ± 1.8mm, φ 210mm ± 2.1mm；
Ovality: diameter tolerance ± 1mm；
Length tolerance: 0 ± 50mm；
End face chamfer angle :≤5mm；
Flexibility: every meter is less than 6mm；
Surface roughness Ra≤3.2 μm；
Must not there be crackle on rod base surface, scab, folds, slag inclusion, is mingled with and shattered crack, and pipe surface does not allow defect；
Macrostructure is observed: must not have in rod base cross section acid macrostructure test piece visual visible white point, shrinking hole remnant, be layered, be mingled with, skull patch and rimhole；
Record relevant weight data to checking qualified excellent base every to weigh, simultaneously to length measuring outside diameter record, be incorporated to raw material storage.
(2) processing internal point: the both ends of the surface of niobium and niobium alloy rod base are processed internal point, the excellent base with internal point can preferably ensure that the rod base secondary when rolling is nipped, improve product geometric accuracy.The size of internal point determines according to rod base, for the excellent base of φ 90mm-φ 180mm, and its internal point chamfering 5mm, diameter 20mm, degree of depth 20mm；For the excellent base of φ 210mm, its internal point chamfering 5mm, diameter 30mm, degree of depth 30mm.
(3) brushing protective coating: by niobium and the external coating protective coating of niobium alloy rod base, owing to when niobium and niobic alloy high temperature heat, chemical property is the most active, energy and oxygen, sulfur, nitrogen, the directly chemical combination such as carbon forms the stable compound of extremely difficult decomposition, the processing characteristics of niobium and mechanical property are by intermittence element influences, especially oxygen, nitrogen, the impact of carbon content is the biggest, a small amount of intermittence element can greatly increase hardness, reduce the ductility of niobium, prevent from during subsequent thermal processing, serious cracking, and in order to avoid rod base reacts with other element when heating, hereby have developed the protective coating for niobium and niobium alloy and carry out rod base coating protection.Described protective coating includes the component of following weight ratio: powder is prepared as following weight percent: the SiO of 20-45%2, the MoO of 0-3%3, the Al of 2-5%2O3, the Li of 5-10%2CO3, the H of 20-40%2BO3, the TiO of 0-5%2, the CaCO of 3-10%3, the ZrO of 5-10%2, the Na of 5-10%2CO3, the K of MgO, 5-15% of 0-5%2CO3, bonding agent is: the sodium polyacrylate of 0.85% and the NaSiO3 9H2O of 5%, a small amount of Silane coupling agent KH550 and surfactant JFC；During use, by said components according to a point powder: obtain protective coating after the ratio mix and blend 0.5h of liquid=2:1.
Before brushing overcoat, first with ethanol and Electric brush of bristles cleaning bar base surface, then spraying a layer thickness is the protective coating of 0.1mm, after standing 12h, then sprays the protective coating that a layer thickness is 0.2-0.25mm, puts into annular furnace and heat after 24h；Deng rod base heat come out of the stove time, protective coating is the most unchanged, rod base when falling steel platform and throwing, protective coating completely falls off, solve well rod base heat time various chemical reaction problems, the most not influence of rolled.
(4) heating: niobium and niobium alloy rod base are put into annular furnace heating, heats, strictly control from shove charge to discharging time with the uniform speed of omnidistance 7min/cm；
The setting of described rod base each stepwise heating temperature requires such as table 1 below:
Table 1:
Above-mentioned, divide each heating period by burner number and distribution, heat in strict accordance with the time period, heating-up temperature is less than more than 5 DEG C of set point of temperature；
When niobium and niobium alloy rod base forward discharging fire door to, three burners on annular furnace discharging opening to be turned down or close, it is ensured that be adjusted to rolling requirements temperature；
Every discharging one will fall furnace bottom in time, makes material return inside partition wall；
During rolling discharging, close flue damper, make burner hearth ensure the burner hearth pressure of rolling requirements.
(5) perforation: the niobium after heating and niobium are closed solid bar base feeding rolled by piercing mill and becomes hollow hollow billet, punching rate 0.6-0.8m/s, gained hollow billet longest dimension 9.8m, hollow billet diameter 100-230mm.
Perforation process temperature is according to temperature strict implement as shown in table 2 below:
Table 2:
The technical data of perforating machine used by perforation process is according to strict implement as shown in table 3 below:
Table 3:
(6) tube rolling: hollow hollow billet feeding pipe mill is carried out equal wall thickness, expanding, extension, obtains hollow forging, gained hollow forging diameter 144.45-253mm, waste thickness of pipe wall 5-25mm.
The temperature of tube rolling operation controls according to strict implement as shown in table 4 below:
Table 4:
Used by tube rolling operation, the technical data of pipe mill is according to strict implement as shown in table 5 below:
Table 5:
(7) sizing: hollow forging is sent into sizing mill and determines that final diameter obtains seamless pipe, after sizing, the external diameter tolerance ± 1.5mm of seamless pipe, wall thickness ± 1.2mm, out-of-roundness and eccentricity are without departing from external diameter wall thickness tolerance, out-of-roundness 1.5mm, eccentricity 1.4mm.
In sizing operation, temperature control process technical parameter is according to strict implement as shown in table 6 below:
(8) cooling: use chain-type cooling bed to carry out air cooling cooling, be cooled to room temperature.
(9) aligning: use room temperature cold leveling, boiled water aligning in straightening process, the seamless pipe after aligning meets: every meter of flexibility≤1.0mm and the 0.15% of total length flexibility≤seamless pipe total length.
(10) sawing: seamless pipe is transported to automatic casing cutter, to its two ends cutting processing, reaches the standard-required of production tube.
(11) sandblasting: seamless pipe is carried out bead to remove surface impurity.
(12) without visiting damage: use ultrasonic flaw detection equipment that seamless pipe is carried out eddy current inspection, it is ensured that product does not has Li Wen, layering, sand holes, falls the defects such as hole, and " flaw detection flaw detection protocol " is filled in.
(13) hand inspection, packaging warehouse-in.
Inspection project: this operation is responsible for the contents such as the chemical composition to every batch of niobium pipe, physical property, hydraulic pressure, ballistic work and is tested by quality inspection portion, the appearance quality of niobium pipe, external diameter, ovality, wall thickness, length, straight degree are measured, every niobium pipe is carried out latus rectum measurement, and fills in " appearance test log ", " finished size inspection record ", " latus rectum record ", " finished chemical inspection record ", " tension test record ", " eddy current inspection protocol ".
Packaging warehouse-in: check qualified product to carry out packaging warehouse-in by customer requirement, fills in " packaging record ", " storage bill ".
The production and processing method using the present invention has produced niobium and the niobium alloy seamless pipe product of series, has the various material such as Nb1, Nb2, NbZr1, NbZr2, product diameter specifications φ 73-219mm, wall thickness 5.5-20mm, length 12.5-13.5m.
Above only describes ultimate principle and the preferred implementation of the present invention, those skilled in the art can many changes may be made and improves according to foregoing description, and these changes and improvements should belong to protection scope of the present invention.
Claims (8)
1. a niobium and niobium alloy seamless pipe hot rolling production and processing method, it is characterised in that comprise the following steps that
(1) select materials: choose qualified niobium and niobium alloy rod base；
(2) processing internal point: the both ends of the surface of niobium and niobium alloy rod base are processed internal point；
(3) brushing protective coating: by niobium and the external coating protective coating of niobium alloy rod base；
(4) heating: niobium and niobium alloy rod base are put into annular furnace heating, heating-up temperature, less than more than 5 DEG C of set point of temperature, heats with the uniform speed of omnidistance 7min/cm；
(5) perforation: the niobium after heating and niobium are closed solid bar base feeding rolled by piercing mill and becomes hollow hollow billet, punching rate 0.6-0.8m/s；
(6) tube rolling: hollow hollow billet feeding pipe mill is carried out equal wall thickness, expanding, extension, obtains hollow forging；
(7) sizing: hollow forging is sent into sizing mill and determines that final diameter obtains seamless pipe, the external diameter tolerance ± 1.5mm of seamless pipe, wall thickness ± 1.2mm after sizing；
(8) cooling: use chain-type cooling bed to carry out air cooling cooling, be cooled to room temperature；
(9) aligning: use room temperature cold leveling, aligns with boiled water in straightening process, and the seamless pipe after aligning meets: every meter of flexibility≤1.0mm and the 0.15% of total length flexibility≤seamless pipe total length；
(10) sawing: seamless pipe is transported to automatic casing cutter, to its two ends cutting processing, reaches the standard-required of production tube；
(11) sandblasting: seamless pipe is carried out bead to remove surface impurity；
(12) without visiting damage: seamless pipe is carried out eddy current inspection, it is ensured that product does not has defect；
(13) hand inspection, packaging warehouse-in.
Method the most according to claim 1, it is characterised in that in described step (1), qualified niobium and niobium alloy rod base meet following condition: external diameter tolerance: ± 1%；Ovality: diameter tolerance ± 1mm；Length tolerance: 0 ± 50mm；End face chamfer angle :≤5mm；Flexibility: every meter is less than 6mm；Surface roughness Ra≤3.2 μm.
Method the most according to claim 1, it is characterised in that in described step (2), the size of internal point determines according to rod base, for the excellent base of φ 90mm-φ 180mm, its internal point chamfering 5mm, diameter 20mm, degree of depth 20mm；For the excellent base of φ 210mm, its internal point chamfering 5mm, diameter 30mm, degree of depth 30mm.
Method the most according to claim 1, it is characterized in that, in described step (3), first with ethanol and Electric brush of bristles cleaning bar base surface, then spraying a layer thickness is the protective coating of 0.1mm, after standing 12h, then spray the protective coating that a layer thickness is 0.2-0.25mm, put into annular furnace after 24h and heat.
Method the most according to claim 1, it is characterized in that, in described step (4), described rod base zone heating in annular furnace, each phase temperature be respectively as follows: preheating section 750-800 DEG C, heating I section 900-950 DEG C, heating II section 1150-1200 DEG C, heating III section 1200-1250 DEG C, discharging time 1250-1280 DEG C.
Method the most according to claim 1, it is characterised in that in described step (5), perforating machine rolls front temperature 1190-1240 DEG C, perforation procedure temperature 1240-1270 DEG C, hollow billet temperature 1180-1230 DEG C after perforation.
Method the most according to claim 1, it is characterised in that in described step (6), rolls front hollow billet temperature 1150-1200 DEG C, operation of rolling temperature 1170-1220 DEG C, rolls rear hollow forging temperature 1140-1190 DEG C.
Method the most according to claim 1, it is characterised in that in described step (7), hollow forging temperature 1090-1140 DEG C before sizing, seamless pipe temperature 1050-1100 DEG C after sizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110170529A (en) * | 2019-05-22 | 2019-08-27 | 山西太钢不锈钢股份有限公司 | A kind of hot piercing method of high alloy heat-resistance stainless steel hollow billet |
| CN112474868A (en) * | 2020-10-20 | 2021-03-12 | 鑫鹏源(聊城)智能科技有限公司 | Hot rolling production process for rolling seamless tube with large diameter expansion |
| CN113020314A (en) * | 2021-03-08 | 2021-06-25 | 鑫鹏源(聊城)智能科技有限公司 | Production process of hot-rolled metal composite pipe |
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| CN113020314A (en) * | 2021-03-08 | 2021-06-25 | 鑫鹏源(聊城)智能科技有限公司 | Production process of hot-rolled metal composite pipe |
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