CN107377620B - Rolled seamless steel pipe and preparation method thereof - Google Patents
Rolled seamless steel pipe and preparation method thereof Download PDFInfo
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- CN107377620B CN107377620B CN201710469981.8A CN201710469981A CN107377620B CN 107377620 B CN107377620 B CN 107377620B CN 201710469981 A CN201710469981 A CN 201710469981A CN 107377620 B CN107377620 B CN 107377620B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- 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
- B21B45/004—Heating the product
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- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- Mechanical Engineering (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
The present invention provides a kind of rolled seamless steel pipes and preparation method thereof.The preparation method is the following steps are included: blank continuous casting: adding Al element in the raw material of No. 45 steel, obtains metallurgical raw material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.015~0.035% of the metallurgical raw material total weight；Perforation hot rolling: blank is first heated up, carries out soaking afterwards, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；Sizing or tube reducing are carried out to hollow forging, then cools down, obtains seamless steel pipe；Wherein, soaking temperature≤1270 DEG C during soaking, heating time≤90min of equal thermal process.In above-mentioned preparation method, set about improving the processing technology based on No. 45 steel production seamless pipe heat from smelting, two broad aspect of hot-rolled process, the grain size number of No. 45 steel rolled seamless steel pipes can be significantly improved, so as to improve the obdurability of No. 45 steel rolled seamless steel pipes.
Description
Technical field
The present invention relates to seamless steel pipe manufacturing fields, in particular to a kind of rolled seamless steel pipe and its preparation side
Method.
Background technique
No. 45 steel are high-quality medium carbon structure steels, are widely used in the manufacturing field of seamless steel pipe, for example, being particularly suitable for oil
On the products such as earthen pipe, hydraulic prop pipe, piston rod pipe.In the prior art, it is usually needed when preparing No. 45 steel seamless steel tubes
Will be by smelt, perforate hot rolling and normalising step, especially normalising step, its object is to improve the crystalline substance of rolled seamless steel pipe
Granularity, to obtain good toughness and tenacity.After normalising step, the grain size of seamless steel pipe usually can be improved to 6 grades with
On.
However, considering in terms of save the cost, most producers wish to omit normalising step, directly seamless with rolled
Steel pipe can also make it have good toughness and tenacity while delivery.
Summary of the invention
The main purpose of the present invention is to provide a kind of rolled seamless steel pipes and preparation method thereof, to solve the prior art
In No. 45 steel rolled seamless steel pipe grain sizes it is insufficient caused by obdurability difference problem.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of preparation of rolled seamless steel pipe
Method comprising following steps: blank continuous casting: Al element is added in the raw material of No. 45 steel, obtains metallurgical raw material；To metallurgical former
Material carries out continuous casting, obtains blank；Wherein, Al element accounts for the 0.015~0.035% of metallurgical raw material total weight；Perforation hot rolling: by base
Material first heats up, and carries out soaking afterwards, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；To hollow forging carry out sizing or
Then tube reducing cools down, obtain seamless steel pipe；Wherein, soaking temperature≤1270 DEG C during soaking, when the heating of equal thermal process
Between≤90min.
Further, in the step of Al element is added in the raw material of No. 45 steel, while Ti element is added, obtains metallurgical original
Material；It is preferred that Ti element accounts for the 0.015~0.035% of metallurgical raw material total weight.
Further, 1250~1270 DEG C of the soaking temperature during soaking, heating time of equal thermal process is 60~
90min。
Further, total heating time≤280min of temperature-rise period and equal thermal process, preferably 245~260min.
Further, temperature-rise period successively include heat-recovery section, preheating section, heating I section, heating II sections, heat III sections and
IV sections of heating, and the heating temperature of heat-recovery section is 680~700 DEG C, the heating temperature of preheating section is 720~740 DEG C, heats I
The heating temperature of section is 970~990 DEG C, and the heating temperature of II sections of heating is 1090~1110 DEG C, the heating temperature of III sections of heating
It is 1190~1210 DEG C, the heating temperature of IV sections of heating is 1250~1270 DEG C.
Further, it perforates in course of hot rolling, before the step of carrying out sizing or tube reducing to hollow forging, preparation method is also wrapped
Include the step of stepping furnace preheating is carried out to hollow forging；It is preferred that the temperature of stepping furnace is 960~965 DEG C.
Further, it perforates in course of hot rolling, after carrying out the step of determining tube reducing to hollow forging, before cooling step, makes
Preparation Method further includes the steps that carrying out finish to gauge to determining the hollow forging after tube reducing；It is preferred that the temperature of finish to gauge is 785~800 DEG C.
Further, in perforation course of hot rolling, in cooling step, cooling rate≤1.2 DEG C/s, preferably cooling rate
It is 0.8~1.2 DEG C.
According to another aspect of the present invention, a kind of rolled seamless steel pipe is additionally provided, by above-mentioned preparation method system
It is standby to form.
Further, the grain size of rolled seamless steel pipe is 6~7.5 grades.
It applies the technical scheme of the present invention, provides a kind of preparation method of rolled seamless steel pipe.The preparation method packet
It includes following steps: blank continuous casting: adding Al element in the raw material of No. 45 steel, obtain metallurgical raw material；Metallurgical raw material is connected
Casting, obtains blank；Wherein, Al element accounts for the 0.015~0.035% of the metallurgical raw material total weight；Perforation hot rolling: by blank elder generation
It heats up, carries out soaking afterwards, obtain hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；Sizing is carried out to hollow forging or is subtracted
Then diameter cools down, obtain seamless steel pipe；Wherein, soaking temperature≤1270 DEG C during soaking, the heating time of equal thermal process
≤90min。
In above-mentioned preparation method, set about improving based on No. 45 steel production seamless pipes from smelting, two broad aspect of hot-rolled process
The processing technology of heat.In blank continuous casting process, 0.015~0.035% Al element joined into No. 45 steel raw materials；And
It perforates in course of hot rolling, the soaking time for controlling blank is≤90min, soaking temperature≤1270 DEG C during soaking.It is based on
The above both sides factor can significantly improve the grain size number of No. 45 steel rolled seamless steel pipes, reach 6 grades or more, from
And it can guarantee the obdurability of No. 45 steel rolled seamless steel pipes while omitting normalizing process, save the cost.In addition, this
Invented technology is simple, without increasing complex device, is suitable for industrialization large-scale application.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the metallurgical structure photo of the seamless steel pipe of 1 preparation according to embodiments of the present invention；
Fig. 2 shows the metallurgical structure photos of the seamless steel pipe of 2 preparation according to embodiments of the present invention；
Fig. 3 shows the metallurgical structure photo of the seamless steel pipe of 3 preparation according to embodiments of the present invention；
Fig. 4 shows the metallurgical structure photo of the seamless steel pipe of 4 preparation according to embodiments of the present invention；
Fig. 5 shows the metallurgical structure photo of the seamless steel pipe of 5 preparation according to embodiments of the present invention；
Fig. 6 shows the metallurgical structure photo of the seamless steel pipe of 6 preparation according to embodiments of the present invention；
Fig. 7 shows the metallurgical structure photo for the seamless steel pipe that according to the present invention prepared by comparative example 1；
Fig. 8 shows the metallurgical structure photo for the seamless steel pipe that according to the present invention prepared by comparative example 2；
Fig. 9 shows the metallurgical structure photo for the seamless steel pipe that according to the present invention prepared by comparative example 3；And
Figure 10 shows the metallurgical structure photo for the seamless steel pipe that according to the present invention prepared by comparative example 4.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The application is described in further detail below in conjunction with specific embodiment, these embodiments should not be understood as limitation originally
Apply for range claimed.
As described in background technology part, No. 45 steel rolled seamless steel pipes exist because of grain size not in the prior art
The problem of the difference of obdurability caused by foot.
To solve the above-mentioned problems, the present invention provides a kind of preparation methods of rolled seamless steel pipe, including following step
It is rapid:
Blank continuous casting: Al element is added in the raw material of No. 45 steel, obtains metallurgical raw material；Continuous casting is carried out to metallurgical raw material,
Obtain blank；Wherein, Al element accounts for the 0.015~0.035% of metallurgical raw material total weight；
Perforation hot rolling: blank is first heated up, carries out soaking afterwards, obtains hot base；Perforation hot rolling is carried out to hot base, is obtained
Hollow forging；Sizing or tube reducing are carried out to hollow forging, then cools down, obtains seamless steel pipe；Wherein, the soaking temperature during soaking≤
1270 DEG C, heating time≤90min of equal thermal process.
In above-mentioned preparation method, set about improving based on No. 45 steel production seamless pipes from smelting, two broad aspect of hot-rolled process
The processing technology of heat.In blank continuous casting process, 0.015~0.035% Al element joined into No. 45 steel raw materials；And
It perforates in course of hot rolling, the soaking time for controlling blank is≤90min, soaking temperature≤1270 DEG C during soaking.It is based on
The above both sides factor can significantly improve the grain size number of No. 45 steel rolled seamless steel pipes, reach 6 grades or more, from
And it can guarantee the obdurability of No. 45 steel rolled seamless steel pipes while omitting normalizing process, save the cost.More preferably
Ground, above-mentioned Al element account for the 0.020~0.030% of metallurgical raw material total weight.
No. 45 composition of steel are the known of those skilled in the art, specific as follows: C:0.42~0.50%wt；Si:0.17~
0.37%wt；Mn:0.50~0.80%wt；P≤0.04%wt；S≤0.04%wt；Ni≤0.25%wt；Cr :≤0.2%wt,
Remaining is iron.
Al element is added in the raw material of No. 45 steel and reaches above-mentioned content, in conjunction with the annular furnace in perforation course of hot rolling
Heating process, it will be able to be effectively improved the grain size of No. 45 steel rolled seamless steel pipes, reach 6 grades even more than.One
In kind of preferred embodiment, in blank continuous casting process, in the step of Al element is added in the raw material of No. 45 steel, add simultaneously
Ti element, obtains metallurgical raw material；It is preferred that Ti element accounts for the 0.015~0.035% of metallurgical raw material total weight.Ti member is further added
Element simultaneously reaches above-mentioned content range, can further refine and homogenize the grain size of No. 45 steel rolled seamless steel pipes,
So as to further improve its obdurability.
In order to advanced optimize technique, improve the obdurability of rolled seamless steel pipe, in a preferred embodiment,
1250~1270 DEG C of soaking temperature during soaking, the heating time of equal thermal process are 60~90min.It is highly preferred that heating
Total heating time≤280min of process and equal thermal process, preferably 245~260min.
Well known to those skilled in the art, when being heated using annular furnace to seamless steel pipe blank, soaking zone is located at last
One procedure, other than soaking zone, there are also warming-up sections for preamble.In above-mentioned preparation method of the invention, warming-up section
Process conditions can use the conventional process of this field.In a preferred embodiment, temperature-rise period successively includes that heat is returned
Receive section, preheating section, I section of heating, II section of heating, III sections of heating and heat IV sections, and the heating temperature of heat-recovery section for 680~
700 DEG C, the heating temperature of preheating section is 720~740 DEG C, and the heating temperature of I sections of heating is 970~990 DEG C, and II sections of heating adds
Hot temperature is 1090~1110 DEG C, and the heating temperature of III sections of heating is 1190~1210 DEG C, and the heating temperature of IV sections of heating is
1250~1270 DEG C.It heats up under the program, there is preferably heating effect for hot base, seamless steel can be further increased
The toughness and tenacity of pipe.
Within the above range by the process regulation of annular furnace warming-up section, be conducive to the heated shape for further improving blank
State, and then further improve subsequent perforation hot rolling effect, to improve the comprehensive performance of seamless steel pipe.
In a preferred embodiment, perforate in course of hot rolling, sizing is carried out to hollow forging or the step of tube reducing it
Before, preparation method further includes the steps that carrying out stepping furnace preheating to hollow forging；It is preferred that the temperature of stepping furnace is 960~965 DEG C.It will be waste
Pipe carries out stepping furnace preheating, can determine tube reducing to be subsequent and lays a solid foundation, raising treatment effect.It is highly preferred that perforation is hot rolled
Cheng Zhong, sizing is carried out to hollow forging or the step of tube reducing after, before cooling step, preparation method further include to tube reducing is determined after
Hollow forging carries out the step of finish to gauge；It is preferred that the temperature of finish to gauge is 785~800 DEG C.
After finish to gauge, cooling procedure can use cooling technique commonly used in the art.In a preferred embodiment,
It perforates in course of hot rolling, in cooling step, cooling rate≤1.2 DEG C/s, preferably cooling rate are 0.8~1.2 DEG C.This is cold
But condition can further improve grain size number.
According to another aspect of the present invention, a kind of rolled seamless steel pipe is additionally provided, by above-mentioned preparation method system
It is standby to form.
In above-mentioned preparation method, set about improving based on No. 45 steel production seamless pipes from smelting, two broad aspect of hot-rolled process
The processing technology of heat.In blank continuous casting process, 0.015~0.035% Al element joined into No. 45 steel raw materials；And
It perforates in course of hot rolling, the soaking time for controlling blank is≤90min, soaking temperature≤1270 DEG C during soaking.It is based on
The above both sides factor can significantly improve the grain size number of No. 45 steel rolled seamless steel pipes, reach 6 grades or more, from
And it can guarantee the obdurability of No. 45 steel rolled seamless steel pipes while omitting normalizing process, save the cost.More preferably
Ground, the grain size of rolled seamless steel pipe are 6~7.5 grades.It is with more excellent toughness and tenacity.
Beneficial effects of the present invention are further illustrated by the following examples:
Test mode:
Grain size number: using the grain size number of national standard GB/T 6394-2002 test seamless steel pipe；
Seamless steel pipe microsctructural photograph: using Germany's Leica DM6000M upright metallurgical microscope to seamless steel pipe
Microstructure carries out metallographic structure detection.
The composition of following No. 45 steel used in the examples is as follows: C:0.46%wt；Si:0.25%wt；Mn:0.60%
wt；P:0.03%wt；S:0.03%wt；Ni:0.15%wt；Cr:0.1%wt, remaining is iron.
Embodiment 1
Blank continuous casting: adding smelting process using microalloy, Al element added in the raw material of No. 45 steel, obtains metallurgical original
Material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.035% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1245 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 692 DEG C, preheating section
Heating temperature be 731 DEG C, heating I section heating temperature be 982 DEG C, heating II section heating temperature be 1105 DEG C, heating III
The heating temperature of section is 1205 DEG C, and the heating temperature of IV sections of heating is 1262 DEG C, and total heating time 280min, wherein soaking zone adds
The hot time is 55min；963 DEG C of stepping furnace temperature, 796 DEG C of finishing temperature, big 1.2 DEG C/S of cold bed cooling rate, obtain grain size number
6.5 grades of rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 1.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 146 | 28 |
Embodiment 2
Blank continuous casting: adding smelting process using microalloy, Al element added in the raw material of No. 45 steel, obtains metallurgical original
Material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.015% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1270 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 692 DEG C, preheating section
Heating temperature be 735 DEG C, heating I section heating temperature be 988 DEG C, heating II section heating temperature be 1108 DEG C, heating III
The heating temperature of section is 1207 DEG C, and the heating temperature of IV sections of heating is 1259 DEG C, total heating time 245min, when soaking zone heats
Between be 90min；963 DEG C of stepping furnace temperature, 790 DEG C of finishing temperature, big 1.0 DEG C/S of cold bed cooling rate, obtain 6.5 grades of grain size number
Rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 2.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 146 | 26 |
Embodiment 3
Blank continuous casting: smelting process is added using microalloy, Al element and Ti element are added in the raw material of No. 45 steel, is obtained
To metallurgical raw material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.024% of metallurgical raw material total weight,
Ti element accounts for the 0.020% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1250 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 676 DEG C, preheating section
Heating temperature be 714 DEG C, heating I section heating temperature be 964 DEG C, heating II section heating temperature be 1088 DEG C, heating III
The heating temperature of section is 1186 DEG C, and the heating temperature of IV sections of heating is 1247 DEG C, total heating time 245min, when soaking zone heats
Between be 90min；960 DEG C of stepping furnace temperature, 788 DEG C of finishing temperature, big 0.8 DEG C/S of cold bed cooling rate, obtain 7.5 grades of grain size number
Rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 3.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 133 | 28 |
Embodiment 4
Blank continuous casting: smelting process is added using microalloy, Al element and Ti element are added in the raw material of No. 45 steel, is obtained
To metallurgical raw material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.030% of metallurgical raw material total weight,
Ti element accounts for the 0.023% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1255 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 692 DEG C, preheating section
Heating temperature be 731 DEG C, heating I section heating temperature be 982 DEG C, heating II section heating temperature be 1105 DEG C, heating III
The heating temperature of section is 1205 DEG C, and the heating temperature of IV sections of heating is 1262 DEG C, total heating time 260min, when soaking zone heats
Between be 90min；960 DEG C of stepping furnace temperature, 795 DEG C of finishing temperature, big 1.2 DEG C/S of cold bed cooling rate, obtain 7 grades of grain size number
Rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 4.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 133 | 28 |
Embodiment 5
Blank continuous casting: smelting process is added using microalloy, Al element and Ti element are added in the raw material of No. 45 steel, is obtained
To metallurgical raw material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.020% of metallurgical raw material total weight,
Ti element accounts for the 0.015% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1255 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 684 DEG C, preheating section
Heating temperature be 723 DEG C, heating I section heating temperature be 977 DEG C, heating II section heating temperature be 1098 DEG C, heating III
The heating temperature of section is 1196 DEG C, and the heating temperature of IV sections of heating is 1254 DEG C, total heating time 260min, when soaking zone heats
Between be 60min；965 DEG C of stepping furnace temperature, 800 DEG C of finishing temperature, big 0.8 DEG C/S of cold bed cooling rate, obtain 7 grades of grain size number
Rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 5.
Embodiment 6
Blank continuous casting: smelting process is added using microalloy, Al element and Ti element are added in the raw material of No. 45 steel, is obtained
To metallurgical raw material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.023% of metallurgical raw material total weight,
Ti element accounts for the 0.035% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1255 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 685 DEG C, preheating section
Heating temperature be 725 DEG C, heating I section heating temperature be 975 DEG C, heating II section heating temperature be 1095 DEG C, heating III
The heating temperature of section is 1197 DEG C, and the heating temperature of IV sections of heating is 1258 DEG C, total heating time 260min, when soaking zone heats
Between be 60min；965 DEG C of stepping furnace temperature, 785 DEG C of finishing temperature, big 0.8 DEG C/S of cold bed cooling rate, obtain 7 grades of grain size number
Rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 6.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 133 | 28 |
Comparative example 1
Blank continuous casting: adding smelting process using microalloy, Al element added in the raw material of No. 45 steel, obtains metallurgical original
Material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.040% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1255 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 686 DEG C, preheating section
Heating temperature be 726 DEG C, heating I section heating temperature be 977 DEG C, heating II section heating temperature be 1098 DEG C, heating III
The heating temperature of section is 1195 DEG C, and the heating temperature of IV sections of heating is 1256 DEG C, total heating time 260min, when soaking zone heats
Between be 90min；960 DEG C of stepping furnace temperature, 792 DEG C of finishing temperature, big 1.2 DEG C/S of cold bed cooling rate, obtain 4 grades of grain size number
Rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 7.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 121 | 30 |
Comparative example 2
Blank continuous casting: continuous casting is carried out to the metallurgical raw material of No. 45 steel, without additional addition, obtains blank；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1285 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 700 DEG C, preheating section
Heating temperature be 766 DEG C, heating I section heating temperature be 1011 DEG C, heating II section heating temperature be 1132 DEG C, heat
III sections of heating temperature is 1225 DEG C, and the heating temperature of IV sections of heating is 1297 DEG C, and total heating time 300min, soaking zone adds
The hot time is 100min；960 DEG C of stepping furnace temperature, 828 DEG C of finishing temperature, big 4 DEG C/S of cold bed cooling rate, obtain grain size number 3
The rolled seamless steel pipe of grade, size is as follows, and microsctructural photograph is as shown in Figure 8.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 133 | 28 |
Comparative example 3
Blank continuous casting: continuous casting is carried out to the metallurgical raw material of No. 45 steel, without additional addition, obtains blank；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1285 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 708 DEG C, preheating section
Heating temperature be 756 DEG C, heating I section heating temperature be 1021 DEG C, heating II section heating temperature be 1142 DEG C, heat
III sections of heating temperature is 1228 DEG C, and the heating temperature of IV sections of heating is 1298 DEG C, and total heating time 300min, soaking zone adds
The hot time is 100min；960 DEG C of stepping furnace temperature, 816 DEG C of finishing temperature, big 5 DEG C/S of cold bed cooling rate, obtain grain size number 3
The rolled seamless steel pipe of grade, size is as follows, and microsctructural photograph is as shown in Figure 9.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 146 | 26 |
Comparative example 4
Blank continuous casting: adding smelting process using microalloy, Al element added in the raw material of No. 45 steel, obtains metallurgical original
Material；Continuous casting is carried out to metallurgical raw material, obtains blank；Wherein, Al element accounts for the 0.020% of metallurgical raw material total weight；
Perforation hot rolling: blank is heated in annular furnace, obtains hot base；Perforation hot rolling is carried out to hot base, obtains hollow forging；It is right
After hollow forging is preheated into stepping furnace, carries out determining tube reducing, then carry out finish to gauge, it is finally uniformly air-cooled in big cold bed, obtain seamless steel pipe；
Wherein, 1275 DEG C of annular furnace soaking zone heating and temperature control, the heating temperature of heat-recovery section are 670 DEG C, preheating section
Heating temperature be 736 DEG C, heating I section heating temperature be 981 DEG C, heating II section heating temperature be 1102 DEG C, heating III
The heating temperature of section is 1195 DEG C, and the heating temperature of IV sections of heating is 1265 DEG C, total heating time 345min, when soaking zone heats
Between be 100min；963 DEG C of stepping furnace temperature, 792 DEG C of finishing temperature, big 0.8 DEG C/S of cold bed cooling rate, obtain 5 grades of grain size number
Rolled seamless steel pipe, size is as follows, and microsctructural photograph is as shown in Figure 10.
| Base diameter (mm) | Outer diameter (mm) | Wall thickness (mm) |
| 180 | 146 | 28 |
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
In above-mentioned preparation method, set about improving based on No. 45 steel production seamless pipes from smelting, two broad aspect of hot-rolled process
The processing technology of heat.In blank continuous casting process, 0.015~0.035% Al element joined into No. 45 steel raw materials；And
It perforates in course of hot rolling, the soaking time for controlling blank is≤90min, soaking temperature≤1270 DEG C during soaking.It is based on
The above both sides factor can significantly improve the grain size number of No. 45 steel rolled seamless steel pipes, reach 6 grades or more, from
And it can guarantee the obdurability of No. 45 steel rolled seamless steel pipes while omitting normalizing process, save the cost.In addition, this
Invented technology is simple, without increasing complex device, is suitable for industrialization large-scale application.
More specifically, in embodiment 3 to 6, Al element and Ti element, and two be joined on the basis of No. 45 steel raw materials
For person's content in preferred scope, the grain size number of obtained seamless steel pipe is higher, shows that its obdurability is higher.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (15)
1. a kind of preparation method of rolled seamless steel pipe, which comprises the following steps:
Blank continuous casting: Al element is added in the raw material of No. 45 steel, obtains metallurgical raw material；Continuous casting is carried out to the metallurgical raw material,
Obtain blank；Wherein, the Al element accounts for the 0.015 ~ 0.035% of the metallurgical raw material total weight；
Perforation hot rolling: the blank is first heated up, carries out soaking afterwards, obtains hot base；Perforation hot rolling is carried out to the hot base,
Obtain hollow forging；Sizing or tube reducing are carried out to the hollow forging, then cools down, obtains the seamless steel pipe；Wherein, the equal thermal process
In soaking temperature≤1270 DEG C, heating time≤90min of the equal thermal process.
2. preparation method according to claim 1, which is characterized in that add Al element in the raw material of No. 45 steel
In step, while Ti element is added, obtains the metallurgical raw material.
3. preparation method according to claim 2, which is characterized in that the Ti element accounts for the metallurgical raw material total weight
0.015~0.035%。
4. preparation method according to any one of claim 1 to 3, which is characterized in that the soaking during the soaking
Temperature is 1250 ~ 1270 DEG C, and the heating time of the equal thermal process is 60 ~ 90min.
5. the preparation method according to claim 4, which is characterized in that the temperature-rise period and the total of the equal thermal process add
The hot time≤280min.
6. preparation method according to claim 5, which is characterized in that the temperature-rise period and the total of the equal thermal process add
The hot time is 245 ~ 260min.
7. preparation method according to claim 5, which is characterized in that the temperature-rise period successively includes heat-recovery section, pre-
IV sections of hot arc, I sections of heating, II sections of heating, III sections of heating and heating, and the heating temperature of the heat-recovery section is 680 ~ 700
DEG C, the heating temperature of the preheating section is 720 ~ 740 DEG C, and the heating temperature of I sections of the heating is 970 ~ 990 DEG C, the heating
II sections of heating temperature is 1090 ~ 1110 DEG C, and the heating temperature of III sections of the heating is 1190 ~ 1210 DEG C, IV sections of the heating
Heating temperature be 1250 ~ 1270 DEG C.
8. preparation method according to any one of claim 1 to 3, which is characterized in that in the perforation course of hot rolling,
Before the step of carrying out sizing or tube reducing to the hollow forging, the preparation method further includes carrying out stepping furnace preheating to the hollow forging
The step of.
9. preparation method according to claim 8, which is characterized in that the temperature of the stepping furnace is 960 ~ 965 DEG C.
10. preparation method according to claim 8, which is characterized in that in the perforation course of hot rolling, to the hollow forging
After the step of carrying out sizing or tube reducing, before cooling step, the preparation method further includes to the hollow forging after sizing or tube reducing
The step of carrying out finish to gauge.
11. preparation method according to claim 10, which is characterized in that the temperature of the finish to gauge is 785 ~ 800 DEG C.
12. preparation method according to any one of claim 1 to 3, which is characterized in that in the perforation course of hot rolling,
In the step of the cooling, cooling rate≤1.2 DEG C/s.
13. preparation method according to claim 12, which is characterized in that the cooling rate is 0.8 ~ 1.2 DEG C/s.
14. a kind of rolled seamless steel pipe, which is characterized in that the preparation method system as described in any one of claims 1 to 13
It is standby to form.
15. rolled seamless steel pipe according to claim 14, which is characterized in that the crystal grain of the rolled seamless steel pipe
Degree is 6 ~ 7.5 grades.
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| CN108273850A (en) * | 2018-01-05 | 2018-07-13 | 衡阳华菱连轧管有限公司 | The test instrument on line method of middle carbon microalloy steel pipe |
| CN108220781A (en) * | 2018-01-24 | 2018-06-29 | 衡阳华菱钢管有限公司 | Seamless steel pipe, its raw material, its production method and perforating gun |
| CN110410658A (en) * | 2019-07-30 | 2019-11-05 | 嘉兴三善金属制品有限公司 | Polygonal steel pipe and its production technology |
| CN113172116B (en) * | 2021-04-25 | 2023-08-01 | 衡阳华菱连轧管有限公司 | Preparation method of seamless steel tube, seamless steel tube and drill rod structure |
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