CN110404973A - A kind of manufacturing method for the seamless steel pipe that diameter is 760mm~914mm - Google Patents
A kind of manufacturing method for the seamless steel pipe that diameter is 760mm~914mm Download PDFInfo
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- CN110404973A CN110404973A CN201910635019.6A CN201910635019A CN110404973A CN 110404973 A CN110404973 A CN 110404973A CN 201910635019 A CN201910635019 A CN 201910635019A CN 110404973 A CN110404973 A CN 110404973A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 192
- 239000010959 steel Substances 0.000 title claims abstract description 192
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000004513 sizing Methods 0.000 claims abstract description 117
- 238000010438 heat treatment Methods 0.000 claims abstract description 95
- 238000001816 cooling Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000009785 tube rolling Methods 0.000 claims abstract description 17
- 238000010010 raising Methods 0.000 claims abstract description 14
- 238000003856 thermoforming Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 abstract description 24
- 238000012545 processing Methods 0.000 abstract description 8
- 238000005096 rolling process Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- B21B19/08—Enlarging tube diameter
-
- 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
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
A kind of diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm, is related to rolling metal processing technique field, filled circles steel blank is successively heated, de-scaling, perforation, tube rolling, expansion, temperature raising, sizing, cooling and finishing.Filled circles steel blank is heated to 1220~1260 DEG C when heating；By high pressure water jets on the surface of filled circles steel blank when de-scaling；Filled circles steel blank is processed into hollow hollow billet when perforation；Hollow hollow billet is rolled when tube rolling, obtains steel pipe that is expanding, subtracting wall thickness；Steel pipe that is expanding, subtracting wall thickness is subjected to expansion when expansion；The steel pipe after expansion is heated to 885~915 DEG C when temperature raising；885~915 DEG C of steel pipe is subjected to tube reducing when sizing, obtains the seamless steel pipe of thermoforming；The seamless steel pipe of thermoforming is cooled down when cooling；Seamless steel pipe surfaces externally and internally is ground when finishing, is aligned, the head and tail portion of sawing seamless steel pipe.Low energy consumption of the present invention, high efficiency.
Description
Technical field
The present invention relates to the production technologies of rolling metal processing technique field, especially seamless large-diameter pipes.
Background technique
Domestic production outer diameter can realize efficient, high-quality life in 720mm seamless steel pipe below by Continuous mill train at present
It produces.With advances in technology with the demand of market development, outer diameter is increasing in 760mm or more seamless steel pipe market demand.
But due to the limit by steel pipe's production preceding road cylinder with large diameter pipe material manufacturing technique and seamless steel pipe hot-rolling equipment
System, existing diameter are that the production equipment of the seamless steel pipe of 760mm or more can only use offline intermediate frequency expanding machine.In production process
In, by the medium-frequency induction heating technology of intermediate frequency expanding machine to steel tube blank segmentally heating, while cooperating and being pushed away to one section of the last period
Into with tapered cylindrical stainless steel metal internal model so that the piecewise enlarged diameter of hollow hollow billet, and expansion expanding every time
Diameter rate cannot be too big, and often a seamless steel tube production being relatively large in diameter needs repeatedly repeatedly to carry out heating expanding.
Not only energy consumption is high for this production method, low efficiency, and repeatedly heats to blank, causes material structure density
Become smaller, until decline the performances such as product pressure resistance, in addition, the poor dimensional precision of manufactured steel pipe, especially in high alloy major diameter
The requirement of properties of product and precision is less able to satisfy in the production of seamless steel pipe.
In addition the technique for also having perforation and tube rolling to combine, the characteristics of being perforated using punch, are, in perforation procedure
Middle realization is isometrical or micro- expanding, and diameter change is little after solid billet perforation；Carrying out tube rolling using pipe mill may be implemented larger ruler
Degree variation subtracts wall and expanding, hollow billet subtracted greatly wall, it is expanding greatly after hollow billet surface outlet spiral channel, cause thickness of steel pipe transversal
It is uneven on face, therefore the thickness of steel pipe uniformity produced is poor, the spiral trace that surfaces externally and internally leaves is serious, and later process is wanted
It is larger to carry out correction improvement difficulty, and high production cost.There are also the techniques that perforation and expansion combine, and are carried out using reeler equal
Whole, reeler has the characteristics that small deformation identical with punch, and the diameter of steel tube and wall thickness change amount after expansion are small, to rolling
Wall unevenness caused by pipe, internal and external screw road are corrected, and the uniformity and inside and outside surface quality of thickness of steel pipe are improved, after reduction
The processing of procedure.But the elongation percentage of steel pipe is inadequate, cannot achieve the effect that subtract greatly wall, big expanding.
Summary of the invention
The purpose of the invention is to overcome the deficiencies of the prior art and provide a kind of low energy consumption, efficient diameter is
The manufacturing method of the seamless steel pipe of 760mm~914mm.
The technical scheme is that: filled circles steel blank is successively heated, de-scaling, perforation, tube rolling, expansion, temperature raising,
Sizing, cooling and finishing.
Wherein, when heated, filled circles steel blank is sent into rotary heating furnace and is heated to 1220~1260 DEG C；In de-scaling
When, by pressure be 30MPa high pressure water jets on the surface of filled circles steel blank；In perforation, filled circles steel blank is placed in and is worn
On the machine of hole, it is processed into hollow hollow billet；In tube rolling, hollow hollow billet is placed on pipe mill and is rolled, acquirement is expanding, subtracts wall thickness
Steel pipe；In expansion, steel pipe that is expanding, subtracting wall thickness is placed on reeler and carries out expansion；In temperature raising, by the steel after expansion
Pipe is heated to 885~915 DEG C using intermediate-frequency heating furnace；In sizing, 885~915 DEG C of steel pipe is placed in five group of three roller sizing
Tube reducing is carried out to steel pipe on machine, obtains the seamless steel pipe of thermoforming；While cooling, that the seamless steel pipe of thermoforming is placed in chain type is cold
It is cooled down on bed；In finishing, seamless steel pipe surfaces externally and internally is ground, is aligned, the head of sawing seamless steel pipe and tail
Portion.
The present invention has following features compared to conventional production lines:
1, the present invention directly produces the seamless steel pipe production tube that outer diameter is 760mm~914mm, production by hot rolling molding process
High-efficient, product quality is excellent, and production cost is low.
2, the technique of the invention combined using perforation, tube rolling and expansion three, overcome perforation+tube-rolling technique and perforate+
The shortcomings that expansion technique.Perforation realization is isometrical or micro- expanding, and diameter change is little after solid billet perforation；Tube rolling may be implemented larger
Dimensional variation subtracts wall and expanding, hollow billet subtracted greatly wall, it is big it is expanding after hollow billet surface outlet spiral channel；Steel pipe may be implemented in expansion
Diameter and wall thickness change amount are small, and the wall unevenness caused by tube rolling, internal and external screw road are corrected, and improve the uniform of thickness of steel pipe
Property and inside and outside surface quality, reduce the processing of later process.Perforation, tube rolling and expansion, which had both realized, subtracts greatly wall, big expanding, also mentions
The high uniformity and steel pipe inside and outside surface quality of wall thickness.
3, steel pipe increases temperature raising technique before sizing, fast by heating in medium frequency heating up speed, and steel pipe heating time is short, In
The amount that steel pipe surfaces externally and internally forms oxide skin is few, improves the quality of steel tube surface.
4, the descaling device of normal use, high-pressure water pressure 20MPa, scale removal effect are poor.Pressure is higher, reaches 30MPa
When, high pressure water is bigger to the impact force of blank surface oxide skin, easier descaling.
Further, can also be according to customer requirement, the present invention is heat-treated after sizing, before cooling, to change its power
It learns, physical and chemical properties, to obtain different physical properties.
Further, high-pressure water descaler is used when de-scaling, filled circles blank is removed with the speed of 4m/20s by high pressure water
Squama machine.The too fast blank surface scale removal effect of speed is poor when de-scaling, and speed is slow, and blank time under high pressure water is too long, blank surface
Cooling is too many, influences the surface quality of steel pipe, through practice 4m/20s speed blank surface scale removal effect and surface temperature drop all
It can take into account.
Further, it is heated three times when temperature raising using six groups of intermediate-frequency heating furnaces being arranged successively, when heating for the first time,
The output power of every group of intermediate-frequency heating furnace is 1000KW, and steel pipe is with the speed average rate of 0.2~0.4m/s from first group of heating in medium frequency
To the 6th group of intermediate-frequency heating furnace, successively forward direction passes through furnace, and using the time 1 minute, the temperature of steel pipe was improved to 815 DEG C~845 DEG C,
It after steel pipe is all come out of the stove, is stopped 20 seconds outside intermediate-frequency heating furnace, steel pipe makes steel pipe in axis while cooling also by heat transfer
Line direction carries out the exchange of high and low temperature region heat, realizes that the temperature of axis direction is uniform, reduces the temperature difference on axis direction,
Steel tube surface temperature drops to 795 DEG C~825 DEG C；When second of heating, the output power of every group of intermediate-frequency heating furnace is 1000KW,
Steel pipe with the speed average rate of 0.2~0.4m/s from the 6th group of intermediate-frequency heating furnace to first group of intermediate-frequency heating furnace successively back through,
The temperature of steel pipe is improved to 915 DEG C~945 DEG C, after steel pipe is all come out of the stove, is stopped 50 seconds outside intermediate-frequency heating furnace, is carried out high low-heat
It can transmit, reduce steel pipe axis direction temperature difference, steel tube surface temperature drops to 865~895 DEG C；When third time heats, every group
The output power of intermediate-frequency heating furnace is 600~650KW, and steel pipe is with the speed average rate of 0.2~0.4m/s from first group of heating in medium frequency
To the 6th group of intermediate-frequency heating furnace, successively forward direction passes through furnace, and the temperature of steel pipe is improved to 915 DEG C~945 DEG C, after steel pipe is all come out of the stove,
It is stopped 30 seconds outside intermediate-frequency heating furnace, steel tube surface temperature drops to 885~915 DEG C, and steel pipe is entered lower one with 1m/s speed
Process carries out sizing.The advantages of this heating means is that heating speed is fast, and the oxide skin of steel tube surface is few, improves the table of steel pipe
Face quality controls steel pipe at ± 15 DEG C in axis direction temperature difference, mentions by the way of temperature raising, stopping thermal energy conduction samming
High outer diameter and wall thickness dimension precision of the steel pipe in sizing, improves the quality of product.
Further, when sizing, three rolls of first group of three-roll sizing mill of five groups of three-roll sizing mills form elliptical aperture,
Major semiaxis is 402.76~485.1mm, and semi-minor axis is 390.65~468.3mm, and ovality is 1.031~1.04；First group three
The entrance velocity of roller sizing mill is 0.5~0.5006m/s, and roll torque is 186.01~385.2kn.m, and roll rotational speed is
11.66~14.4rpm, power are 222.4~5567.4kw.
Further, second group of three-roll sizing mill three rolls formed elliptical aperture, major semiaxis be 398.875~
477.9mm, semi-minor axis are 385.014~461.3mm, and ovality is 1.036~1.04；The entrance speed of second group of three-roll sizing mill
Degree is 0.5~0.5039m/s, and roll torque is 245.89~406.2kn.m, and roll rotational speed is 11.71~14.3rpm, power
For 295.35~593.5kw；The coefficient of tension between second group of three-roll sizing mill and first group of three-roll sizing mill is 0.0.
Further, third group three-roll sizing mill three rolls formed elliptical aperture, major semiaxis be 394.088~
471.7mm, semi-minor axis are 380.394~455.3mm, and ovality is 1.036~1.04；The entrance speed of third group three-roll sizing mill
Degree is 0.5~0.5073m/s, and roll torque is 247.14~398.2kn.m, and roll rotational speed is 11.67~14.1rpm, power
For 395.78~576.0kw；The coefficient of tension between third group three-roll sizing mill and second group of three-roll sizing mill is 0.0.
Further, three rolls of the 4th group of three-roll sizing mill form elliptical aperture, and major semiaxis is 387.165~
482.6mm, semi-minor axis are 379.573~438.7mm, and ovality is 1.02~1.10；The entrance speed of 4th group of three-roll sizing mill
Degree is 0.5~0.5101m/s, and roll torque is 199.61~551.0kn.m, and roll rotational speed is 11.57~14.3rpm, power
For 236.81~806.5kw；The coefficient of tension between 4th group of three-roll sizing mill and third group three-roll sizing mill is 0.0.
Further, three rolls of the 5th group of three-roll sizing mill form circular hole, and radius is 382.985~459.3mm；The
The entrance velocity of five groups of three-roll sizing mills is 0.5~0.5104m/s, and roll torque is 71.74~176.8kn.m, roll rotational speed
For 13.32~13.6rpm, power is 83.29~246.1kw；Between 5th group of three-roll sizing mill and the 4th group of three-roll sizing mill
The coefficient of tension be 0.0.
First group of three-roll sizing mill is entrance of the steel pipe into sizing mill, and the 5th group of three-roll sizing mill is steel pipe after tube reducing
The outlet Gui Yuan.Using no-station pole canopy tube reducing, steel pipe is avoided to stretch during the rolling process, so that thickness of steel pipe is in steel pipe axis side
To uneven.Using the method for small reducing rate, the circularity of steel pipe inner wall is improved, polygon is avoided the formation of.
Specific embodiment
Embodiment 1: for producing the seamless steel pipe that diameter (i.e. outer diameter) is 914mm, wall thickness is 38mm.
Specific steps are as follows: filled circles steel blank is successively heated online, de-scaling, perforation, tube rolling, expansion, temperature raising, is determined
Diameter, cooling, heat treatment, finishing procedure obtain finished product seamless steel pipe.
When heated, the filled circles steel blank that diameter is 700mm is sent into rotary heating furnace and is heated, heating temperature
1220 DEG C, soaking time 450min.
In de-scaling, using high-pressure water descaler, by roller-way by temperature be 1220 DEG C filled circles steel blank with 4m/
The speed of 20s passes through high-pressure water descaler and is sprayed on the surface of filled circles steel blank, high pressure water using the high pressure water of 30MPa pressure
Filled circles steel blank surface is impacted, the oxide skin on filled circles steel blank surface is shaken, it is made to fall off, carries out de-scaling.
In perforation, 1220 DEG C of filled circles steel blank is placed on punch, filled circles steel blank is processed into diameter
The hollow hollow billet for being 70mm for 730mm, wall thickness.
In tube rolling, hollow hollow billet is placed on pipe mill, using the method for heavy reduction, realizes and extends greatly, is big expanding,
Design parameter: lengthening coefficient 2.2, enlarging rate 24.5%, wall thickness reducing amount 28mm roll hollow hollow billet, obtain outer diameter and are
910mm, the steel pipe that is expanding, subtracting wall thickness that wall thickness is 42mm, the surfaces externally and internally of steel pipe that is expanding, subtracting wall thickness have spiral channel.
In expansion, steel pipe that is expanding, subtracting wall thickness is placed on reeler, using small extension, small expanding method, subtracts wall
5mm is measured, enlarging rate 6% carries out expansion, repairs the scuffing and spiral channel of the surfaces externally and internally of hollow hollow billet, improve the uniformity of wall thickness
With the quality of surfaces externally and internally, the steel pipe that diameter is 965mm, wall thickness is 37mm is obtained.
In temperature raising, the steel pipe after expansion is utilized into six groups of intermediate-frequency heating furnaces, heats samming, round-trip heating three times, is heated
To 900 ± 15 DEG C.Six groups of intermediate-frequency heating furnaces are first group of intermediate-frequency heating furnace being arranged successively, second group of intermediate-frequency heating furnace, third
Group intermediate-frequency heating furnace, the 4th group of intermediate-frequency heating furnace, the 5th group of intermediate-frequency heating furnace and the 6th group of intermediate-frequency heating furnace.It heats for the first time
When, the output power of every group of intermediate-frequency heating furnace is 1000KW, and steel pipe is with the speed average rate of 0.2m/s from first group of intermediate-frequency heating furnace
To the 6th group of intermediate-frequency heating furnace, successively forward direction passes through, and the temperature of steel pipe is improved to 830 DEG C, after steel pipe has all gone out furnace body, in
It is stopped 20 seconds outside frequency heating furnace, steel tube surface temperature drops to 810 DEG C；When second of heating, the output of every group of intermediate-frequency heating furnace
Power is 1000KW, and steel pipe is successively anti-from the 6th group of intermediate-frequency heating furnace to first group of intermediate-frequency heating furnace with the speed average rate of 0.2m/s
To passing through, the temperature of steel pipe is improved to 930 DEG C, after steel pipe has all gone out furnace body, is stopped 50 seconds outside intermediate-frequency heating furnace, steel pipe table
Face temperature drops to 880 DEG C；When third time heats, the output power of every group of intermediate-frequency heating furnace is 650KW, and steel pipe is with 0.2m/s's
From first group of intermediate-frequency heating furnace to the 6th group of intermediate-frequency heating furnace, successively forward direction passes through speed average rate, and the temperature of steel pipe is improved to 930
DEG C, after steel pipe has all gone out furnace body, stopped 30 seconds outside intermediate-frequency heating furnace, steel tube surface temperature drops to 885~915 DEG C.
In sizing, 885~915 DEG C of expanding steel pipe is passed sequentially through into five groups of three-roll sizing mills and carries out tube reducing processing.
Five groups of three-roll sizing mills be first group of three-roll sizing mill being arranged successively, second group of three-roll sizing mill, third group three-roll sizing mill,
4th group of three-roll sizing mill and the 5th group of three-roll sizing mill.
Three rolls formation elliptical aperture of first group of three-roll sizing mill, major semiaxis 485.1mm, semi-minor axis 468.3mm,
Ovality is 1.04；The entrance velocity of first group of three-roll sizing mill is 0.5m/s, roll torque 385.2kn.m, roll rotational speed
For 14.4rpm, power 567.4kw.It is 953.4mm, wall thickness that average diameter is obtained after first group of three-roll sizing mill is handled
For the seamless steel pipe of 37.2mm, reducing rate 1.2%, lengthening coefficient 1.0.
Three rolls formation elliptical aperture of second group of three-roll sizing mill, major semiaxis 477.9mm, semi-minor axis 461.3mm,
Ovality is 1.04；The entrance velocity of second group of three-roll sizing mill is 0.5m/s, roll torque 406.2kn.m, roll rotational speed
For 14.3rpm, power 593.5kw；The coefficient of tension between second group of three-roll sizing mill and first group of three-roll sizing mill is
0.0.The seamless steel pipe that average diameter is 939.1mm, wall thickness is 37.5mm is obtained after second group of three-roll sizing mill is handled, is subtracted
Diameter rate is 1.5%, lengthening coefficient 1.0.
Three rolls formation elliptical aperture of third group three-roll sizing mill, major semiaxis 471.7mm, semi-minor axis 455.3mm,
Ovality is 1.04；The entrance velocity of third group three-roll sizing mill is 0.5m/s, roll torque 398.2kn.m, roll rotational speed
For 14.1rpm, power 576.0kw；The coefficient of tension between third group three-roll sizing mill and second group of three-roll sizing mill is
0.0.The seamless steel pipe that average diameter is 926.9mm, wall thickness is 37.8mm is obtained after the processing of third group three-roll sizing mill, is subtracted
Diameter rate is 1.3%, lengthening coefficient 1.0.
Three rolls formation elliptical aperture of 4th group of three-roll sizing mill, major semiaxis 482.6mm, semi-minor axis 438.7mm,
Ovality is 1.10；The entrance velocity of 4th group of three-roll sizing mill is 0.5m/s, roll torque 551.0kn.m, roll rotational speed
For 14.3rpm, power 806.5kw；The coefficient of tension between 4th group of three-roll sizing mill and third group three-roll sizing mill is
0.0.The seamless steel pipe that average diameter is 921.3mm, wall thickness is 37.9mm is obtained after the 4th group of three-roll sizing mill is handled, is subtracted
Diameter rate is 0.6%, lengthening coefficient 1.0.
Three rolls of the 5th group of three-roll sizing mill form circular hole, radius 459.3mm；5th group of three-roll sizing mill enters
Mouth speed is 0.5m/s, roll torque 176.8kn.m, roll rotational speed 13.6rpm, power 246.1kw；5th group of three rollers
The coefficient of tension between sizing mill and the 4th group of three-roll sizing mill is 0.0.It is obtained after the 5th group of three-roll sizing mill is handled straight
The seamless steel pipe for the thermoforming that diameter is 918.6mm, wall thickness is 37.9mm, reducing rate 0.3%, lengthening coefficient 1.0.
While cooling, the seamless steel pipe of thermoforming is placed on chain-type cooling bed and is cooled down, obtaining diameter is 914mm, wall
Thickness is the seamless steel pipe of 38mm.The spinning of steel pipe may be implemented in chain-type cooling bed during cooling, to guarantee cooling
Steel pipe is not bent in the process.
In heat treatment, steel pipe is heat-treated according to customer requirement, reaches the performance of needs.
In finishing, seamless steel pipe surfaces externally and internally is ground, is aligned, the head and tail portion of sawing seamless steel pipe.
Embodiment 2: for producing the seamless steel pipe that diameter (i.e. outer diameter) is 760mm, wall thickness is 26.5mm.
Specific steps are as follows: filled circles steel blank is successively heated online, de-scaling, perforation, tube rolling, expansion, temperature raising, is determined
Diameter, cooling, heat treatment, finishing procedure obtain finished product seamless steel pipe.
When heated, the filled circles steel blank that diameter is 500mm is sent into rotary heating furnace and is heated, heating temperature
1220 DEG C, soaking time 450min.
In de-scaling, using high-pressure water descaler, by roller-way by temperature be 1220 DEG C filled circles steel blank with 4m/
The speed of 20s passes through high-pressure water descaler and is sprayed on the surface of filled circles steel blank, high pressure water using the high pressure water of 30MPa pressure
Filled circles steel blank surface is impacted, the oxide skin on filled circles steel blank surface is shaken, it is made to fall off, carries out de-scaling.
In perforation, 1220 DEG C of filled circles steel blank is placed on punch, filled circles steel blank, which is processed into diameter, is
540mm, the hollow hollow billet that wall thickness is 55mm.
In tube rolling, hollow hollow billet is placed on pipe mill, using the method for heavy reduction, realizes and extends greatly, is big expanding,
Design parameter: lengthening coefficient 2.2, enlarging rate 27.7%, wall thickness reducing amount 23mm roll hollow hollow billet, obtain outer diameter and are
690mm, the steel pipe that is expanding, subtracting wall thickness that wall thickness is 32mm, the surfaces externally and internally of steel pipe that is expanding, subtracting wall thickness have spiral channel.
In expansion, steel pipe that is expanding, subtracting wall thickness is placed on reeler, using small extension, small expanding method, subtracts wall
6mm is measured, enlarging rate 12% carries out expansion, repairs the scuffing and spiral channel of the surfaces externally and internally of hollow hollow billet, improve the uniformity of wall thickness
With the quality of surfaces externally and internally, the steel pipe that diameter is 795mm, wall thickness is 26mm is obtained.
In temperature raising, the steel pipe after expansion is utilized into six groups of intermediate-frequency heating furnaces, heats samming, round-trip heating three times, is heated
To 900 ± 15 DEG C.Six groups of intermediate-frequency heating furnaces are first group of intermediate-frequency heating furnace being arranged successively, second group of intermediate-frequency heating furnace, third
Group intermediate-frequency heating furnace, the 4th group of intermediate-frequency heating furnace, the 5th group of intermediate-frequency heating furnace and the 6th group of intermediate-frequency heating furnace.It heats for the first time
When, the output power of every group of intermediate-frequency heating furnace is 1000KW, and steel pipe is with the speed average rate of 0.4m/s from first group of intermediate-frequency heating furnace
To the 6th group of intermediate-frequency heating furnace, successively forward direction passes through, and the temperature of steel pipe is improved to 830 DEG C, after steel pipe has all gone out furnace body, in
It is stopped 20 seconds outside frequency heating furnace, steel tube surface temperature drops to 810 DEG C；When second of heating, the output of every group of intermediate-frequency heating furnace
Power is 1000KW, and steel pipe is successively anti-from the 6th group of intermediate-frequency heating furnace to first group of intermediate-frequency heating furnace with the speed average rate of 0.4m/s
To passing through, the temperature of steel pipe is improved to 930 DEG C, after steel pipe has all gone out furnace body, is stopped 50 seconds outside intermediate-frequency heating furnace, steel pipe table
Face temperature drops to 880 DEG C；When third time heats, the output power of every group of intermediate-frequency heating furnace is 650KW, and steel pipe is with 0.4m/s's
From first group of intermediate-frequency heating furnace to the 6th group of intermediate-frequency heating furnace, successively forward direction passes through speed average rate, and the temperature of steel pipe is improved to 930
DEG C, after steel pipe has all gone out furnace body, stopped 30 seconds outside intermediate-frequency heating furnace, steel tube surface temperature drops to 885~915 DEG C.
In sizing, 885~915 DEG C of expanding steel pipe is passed sequentially through into five groups of three-roll sizing mills and carries out tube reducing processing.
Five groups of three-roll sizing mills be first group of three-roll sizing mill being arranged successively, second group of three-roll sizing mill, third group three-roll sizing mill,
4th group of three-roll sizing mill and the 5th group of three-roll sizing mill.
Three rolls of first group of three-roll sizing mill form elliptical aperture, major semiaxis 402.76mm, and semi-minor axis is
390.65mm ovality 1.031；The entrance velocity of first group of three-roll sizing mill is 0.5006m/s, and roll torque is
186.01kn.m, roll rotational speed 11.66rpm, power 222.45kw.It is put down after first group of three-roll sizing mill is handled
The seamless steel pipe that diameter is 793.41mm, wall thickness is 26.03mm, reducing rate 0.2%, lengthening coefficient 1.0011.
Three rolls of second group of three-roll sizing mill form elliptical aperture, major semiaxis 398.875mm, and semi-minor axis is
385.014mm ovality 1.036；The entrance velocity of second group of three-roll sizing mill is 0.5039m/s, and roll torque is
245.89kn.m, roll rotational speed 11.71rpm, power 295.35kw；Second group of three-roll sizing mill and first group of three roller sizing
The coefficient of tension between machine is 0.0.It is 783.889mm, wall thickness that average diameter is obtained after second group of three-roll sizing mill is handled
For the seamless steel pipe of 26.18mm, reducing rate 1.2%, lengthening coefficient 1.0067.
Three rolls of third group three-roll sizing mill form elliptical aperture, major semiaxis 394.088mm, and semi-minor axis is
380.394mm ovality 1.036；The entrance velocity of third group three-roll sizing mill is 0.5073m/s, and roll torque is
247.14kn.m, roll rotational speed 11.67rpm, power 395.78kw；Third group three-roll sizing mill and second group of three roller sizing
The coefficient of tension between machine is 0.0.Obtain that average diameter is 774.48mm, wall thickness is after the processing of third group three-roll sizing mill
The seamless steel pipe of 26.34mm, reducing rate 1.2%, lengthening coefficient 1.0067.
Three rolls of the 4th group of three-roll sizing mill form elliptical aperture, major semiaxis 387.165mm, and semi-minor axis is
379.573mm ovality 1.02；The entrance velocity of 4th group of three-roll sizing mill is 0.5101m/s, and roll torque is
199.61kn.m, roll rotational speed 11.57rpm, power 236.81kw；4th group of three-roll sizing mill and three roller sizing of third group
The coefficient of tension between machine is 0.0.Obtain that average diameter is 766.78mm, wall thickness is after the 4th group of three-roll sizing mill is handled
The seamless steel pipe of 26.47mm, reducing rate 1.0%, lengthening coefficient 1.0056.
Three rolls of the 5th group of three-roll sizing mill form circular hole, radius 382.985mm；5th group of three-roll sizing mill
Entrance velocity is 0.5104m/s, roll torque 71.74kn.m, roll rotational speed 13.32rpm, power 83.29kw；5th
The coefficient of tension between group three-roll sizing mill and the 4th group of three-roll sizing mill is 0.0.After the 5th group of three-roll sizing mill is handled
The seamless steel pipe for the thermoforming that diameter is 765.97mm, wall thickness is 26.49mm, reducing rate 0.1% are obtained, lengthening coefficient is
1.0006。
While cooling, the seamless steel pipe of thermoforming is placed on chain-type cooling bed and is cooled down, obtaining diameter is 760mm, wall
Thickness is the seamless steel pipe of 26.5mm.The spinning of steel pipe may be implemented in chain-type cooling bed during cooling, to guarantee in cooling
During steel pipe be not bent.
In heat treatment, steel pipe is heat-treated according to customer requirement, reaches the performance of needs.
In finishing, seamless steel pipe surfaces externally and internally is ground, is aligned, the head and tail portion of sawing seamless steel pipe.
Claims (9)
1. the manufacturing method that a kind of diameter is the seamless steel pipe of 760mm~914mm, it is characterised in that successively by filled circles steel blank
It is heated, de-scaling, perforation, tube rolling, expansion, temperature raising, sizing, cooling and finishing；
When heated, filled circles steel blank is sent into rotary heating furnace and is heated to 1220~1260 DEG C；
In de-scaling, by pressure be 30MPa high pressure water jets on the surface of filled circles steel blank；
In perforation, filled circles steel blank is placed on punch, hollow hollow billet is processed into；
In tube rolling, hollow hollow billet is placed on pipe mill and is rolled, obtains steel pipe that is expanding, subtracting wall thickness；
In expansion, steel pipe that is expanding, subtracting wall thickness is placed on reeler and carries out expansion；
In temperature raising, the steel pipe after expansion is heated to 885~915 DEG C using intermediate-frequency heating furnace；
In sizing, 885~915 DEG C of steel pipe is placed on five groups of three-roll sizing mills, tube reducing is carried out to steel pipe, obtain thermoforming
Seamless steel pipe；
While cooling, the seamless steel pipe of thermoforming is placed on chain-type cooling bed and is cooled down；
In finishing, seamless steel pipe surfaces externally and internally is ground, is aligned, the head and tail portion of sawing seamless steel pipe.
2. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 1, it is characterised in that: fixed
It is heat-treated after diameter, before cooling.
3. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 1, it is characterised in that: de-scaling
Shi Caiyong high-pressure water descaler, filled circles blank pass through high-pressure water descaler with the speed of 4m/20s.
4. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 1, it is characterised in that: temperature raising
Six groups of intermediate-frequency heating furnaces that Shi Caiyong is arranged successively are heated three times, when heating for the first time, the output of every group of intermediate-frequency heating furnace
Power is 1000KW, and steel pipe is with the speed average rate of 0.2~0.4m/s from first group of intermediate-frequency heating furnace to the 6th group of intermediate-frequency heating furnace
Successively forward direction passes through, and the temperature of steel pipe is improved to 815 DEG C~845 DEG C, and after steel pipe is all come out of the stove, 20 are stopped outside intermediate-frequency heating furnace
Second, steel tube surface temperature drops to 795 DEG C~825 DEG C；When second of heating, the output power of every group of intermediate-frequency heating furnace is
1000KW, steel pipe are successively anti-from the 6th group of intermediate-frequency heating furnace to first group of intermediate-frequency heating furnace with the speed average rate of 0.2~0.4m/s
To passing through, the temperature of steel pipe is improved to 915 DEG C~945 DEG C, after steel pipe is all come out of the stove, is stopped 50 seconds outside intermediate-frequency heating furnace, steel
Pipe surface temperature drops to 865~895 DEG C；When third time heats, the output power of every group of intermediate-frequency heating furnace is 600~650KW,
With the speed average rate of 0.2~0.4m/s, from first group of intermediate-frequency heating furnace, to the 6th group of intermediate-frequency heating furnace, successively forward direction passes through steel pipe,
The temperature of steel pipe is improved to 915 DEG C~945 DEG C, after steel pipe is all come out of the stove, is stopped 30 seconds outside intermediate-frequency heating furnace, steel tube surface temperature
Degree drops to 885~915 DEG C.
5. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 1, it is characterised in that: sizing
When, three rolls of first group of three-roll sizing mill of five groups of three-roll sizing mills form elliptical aperture, and major semiaxis is 402.76~
485.1mm, semi-minor axis are 390.65~468.3mm, and ovality is 1.031~1.04；The entrance speed of first group of three-roll sizing mill
Degree is 0.5~0.5006m/s, and roll torque is 186.01~385.2kn.m, and roll rotational speed is 11.66~14.4rpm, power
For 222.4~5567.4kw.
6. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 5, it is characterised in that: second
Group three-roll sizing mill three rolls formed elliptical aperture, major semiaxis be 398.875~477.9mm, semi-minor axis be 385.014~
461.3mm, ovality are 1.036~1.04；The entrance velocity of second group of three-roll sizing mill is 0.5~0.5039m/s, roll-force
Square is 245.89~406.2kn.m, and roll rotational speed is 11.71~14.3rpm, and power is 295.35~593.5kw；Second group three
The coefficient of tension between roller sizing mill and first group of three-roll sizing mill is 0.0.
7. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 6, it is characterised in that: third
Group three-roll sizing mill three rolls formed elliptical aperture, major semiaxis be 394.088~471.7mm, semi-minor axis be 380.394~
455.3mm, ovality are 1.036~1.04；The entrance velocity of third group three-roll sizing mill is 0.5~0.5073m/s, roll-force
Square is 247.14~398.2kn.m, and roll rotational speed is 11.67~14.1rpm, and power is 395.78~576.0kw；Third group three
The coefficient of tension between roller sizing mill and second group of three-roll sizing mill is 0.0.
8. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 9, it is characterised in that: the 4th
Group three-roll sizing mill three rolls formed elliptical aperture, major semiaxis be 387.165~482.6mm, semi-minor axis be 379.573~
438.7mm, ovality are 1.02~1.10；The entrance velocity of 4th group of three-roll sizing mill is 0.5~0.5101m/s, roll-force
Square is 199.61~551.0kn.m, and roll rotational speed is 11.57~14.3rpm, and power is 236.81~806.5kw；4th group three
The coefficient of tension between roller sizing mill and third group three-roll sizing mill is 0.0.
9. diameter is the manufacturing method of the seamless steel pipe of 760mm~914mm according to claim 8, it is characterised in that: the 5th
Three rolls of group three-roll sizing mill form circular hole, and radius is 382.985~459.3mm；The entrance of 5th group of three-roll sizing mill
Speed is 0.5~0.5104m/s, and roll torque is 71.74~176.8kn.m, and roll rotational speed is 13.32~13.6rpm, power
For 83.29~246.1kw；The coefficient of tension between 5th group of three-roll sizing mill and the 4th group of three-roll sizing mill is 0.0.
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