CN101658879A - Method for manufacturing seamless steel pipe - Google Patents
Method for manufacturing seamless steel pipe Download PDFInfo
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- CN101658879A CN101658879A CN200810042123A CN200810042123A CN101658879A CN 101658879 A CN101658879 A CN 101658879A CN 200810042123 A CN200810042123 A CN 200810042123A CN 200810042123 A CN200810042123 A CN 200810042123A CN 101658879 A CN101658879 A CN 101658879A
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Abstract
The invention relates to a method for manufacturing a seamless steel pipe, which comprises the following steps: 1) setting the following mass percents for the components of a pipe blank: 0.22 to 0.4 percent of C, 0.1 to 0.5 percent of Si, 1.0 to 2.0 percent of Mn, 0.05 to 0.25 percent of V, 0.005 to 0.050 percent of Al, 0.015 to 0.030 percent of N, and the balance of Fe and inevitable impurities;2) heating the pipe blank at a temperature of between 1,200 and 1,320 DEG C, perforating the pipe blank by a perforating machine at a temperature of between 1,150 and 1,250 DEG C, then rolling the pipe blank at a temperature of between 900 and 1,050 DEG C, putting the rolled pipe blank into a reducing mill set after rod uncoupling, and rolling the pipe blank into a steel pipe at a temperature of between 750 and 850 DEG C; and 3) quickly cooling the steel pipe to a temperature of between 400 and 650 DEG C at a cooling speed of 5 to 50 DEG C per second by water or the water and a gas in 10 seconds after the steel pipe is taken out of the reducing mill, and performing air cooling. The method can ensure that the phenomena of mixed crystals and coarse crystals cannot occur during high-temperature rolling, and the steel pipe after the rod uncoupling is not needed to be put into a reheating furnace but is rolled in the reducing mill, thereby simplifying the production process. By using accelerated cooling after final rolling, a structure mainly comprising a bainite is obtained to be directly used for producing oil well pipes without quenching and tempering heat treatment.
Description
Technical field
The present invention relates to a kind of manufacture of steel pipe, a kind of method of manufacturing seamless steel pipe of particularly production high-performance oil well pipe.
Background technology
The main processes of traditional production high-performance oil well pipe is: 1250～1300 ℃ of pipes add hot piercing, 950～1050 ℃ of tandem rollings, take off be heated to that 950～980 ℃ of austenitizings are handled behind the rod again, stretch-reducing mill in 920～950 ℃ of tube rollings, air cooling to room temperature after modified heat treatment.Because the tandem rolling temperature is higher, crystal grain is thick, takes off rod back steel pipe and enters reheating furnace at once, advances stokehold steel pipe temperature and still is higher than the Ac1 point, make austenite coarse-grain behind the tandem rolling remain into to open subtract rolling before.Because it is higher to open the tube rolling temperature that subtracts machine, in the austenite recrystallization district, rolling under the air cooling condition of back, crystal grain is still thick.This organization factors is mainly adjusted by adopting quenched and tempered steel to roll the modified heat treatment in back, obtains tissues needed and performance by quenching after rolling and temper.
Because modified heat treatment cost is higher, enhances competitiveness for reducing production costs, and steel pipe line normalizing process technology again occurred.Its essence is that the steel pipe temperature that tandem rolling is taken off behind the rod reduces to below the Ac1, to ferritic transformation, carry out once phase-change before making steel pipe enter reheating furnace by austenite, in reheating furnace, reheat austenitizing after, utilize recrystallization refine austenite crystal grain.Like this through open subtract after the steel pipe crystal grain of air cooling can be than refinement to some extent in the past, generally can bring up to 9～10 grades from 6～7 grades, toughness also increases.
Though this technology can be improved the toughness of steel pipe, intensity improves little.For improving intensity, occurred on the basis of online normalizing, improve and open the online accelerated cooling process that subtracts the back cooling velocity.Adopt this kind technology,, but still have two problems though can improve the obdurability of material: the one, be subjected to the restriction of original process layout, be difficult in the steel pipe that takes off behind the rod is cooled to below the Ac1 temperature very soon; The 2nd, the acceleration cooling velocity after the steel pipe finish to gauge is fast inadequately, can only obtain the tissue based on ferrite, can not produce other oil well pipe of N80 and higher level.
Summary of the invention
Purpose of the present invention has proposed a kind of method of manufacturing seamless steel pipe, does not occur mixed crystal and coarse-grain phenomenon in the time of can guaranteeing high temperature rolling, and the steel pipe that takes off behind the rod need not enter reheating furnace, and it is rolling directly to enter reducing mill, simplifies production technology.Utilize the acceleration cooling after the finish to gauge, obtain tissue, without the direct production high-performance of modified heat treatment oil well pipe based on bainite.
For achieving the above object, technical scheme of the present invention is,
A kind of method of manufacturing seamless steel pipe, it comprises the steps:
1) the composition quality percentage of pipe is: C:0.22～0.4%, Si:0.1～0.5%, Mn:1.0～2.0%, V:0.05～0.25%, Al:0.005～0.050%, N:0.015～0.030%, surplus are Fe and inevitable impurity;
2) pipe after 1200～1320 ℃ of heating, 1150～1250 ℃ of perforation, then at 900～1050 ℃ of tube rollings, enters the reducing mill group after taking off rod through punch through rotary heating furnace, rolls into steel pipe at 750～850 ℃;
3) steel pipe water or water aerating within 10 seconds after reducing mill comes out with the cooling velocity of 5～50 ℃/S, is cooled fast between 400～650 ℃, and air cooling then, the steel pipe behind the air cooling are pressed production tube delivery after inspection.
Further, the composition of pipe of the present invention also comprises: one or more in Mo:0.10～0.40%, Nb:0.01～0.05%, Ti:0.005～0.05%.By behind the tube-rolling technique tube rolling of above-mentioned requirements, do not need heat treatment, directly roll into N80 and above steel-grade bushing and use.
In the present invention,
C:0.22～0.4 (wt%, below each element identical), C is a carbide former, can improve the intensity of steel, DeGrain when too low, too Gao Shihui reduces the toughness of steel greatly.
Mn:1.0～2.0, Mn is an austenite former, can improve the quenching degree of steel, and content is not obvious less than effect in 1.0 o'clock, and content increased the remained austenite content in the steel greatly greater than 2.0 o'clock, influenced the uniformity of hot rolling microstructure.
N:0.015～0.030, N is a carbide former, can improve the intensity of steel, especially when cooling velocity was accelerated, effect was more obvious.DeGrain when N content is too low then can form big nitride inclusion when too high, reduce the performance of steel.N and C are used, and can improve intensity under the situation that effectively reduces carbon equivalent.
V:0.05～0.25 can crystal grain thinning, forms carbide, improves the intensity and the toughness of steel.But when content reached a certain amount of, its effect increase was just not obvious, simultaneously because price is very high, so want prohibitive amount.
Ti:0.005～0.05 can crystal grain thinning, forms carbide, improves the intensity and the toughness of steel.But when content reached a certain amount of, its effect increase was just not obvious, simultaneously because price is very high, so want prohibitive amount.
Mo:0.1～0.4: mainly be the intensity that improves steel by carbide and solution strengthening form, too high levels can reduce the toughness of steel.
Adopt steel grade of the present invention, the tube rolling condition about 1000 ℃ is in complete dynamic recrystallization state, thereby guarantees not occur mixed crystal phenomenon; Elements such as the C that contains in the material, V, Ti, N can guarantee under the high temperature rolling condition, separate out a large amount of vanadium and the carbonitride of titanium, play the effect of pinning crystal boundary, crystal grain thinning.Therefore after the steel pipe tandem rolling takes off rod, can be cooled to below the Ac1 temperature, the transformation that once is recrystallized, but can directly carry out reducing and rolling.
Adopt steel grade of the present invention, under the finish to gauge condition about 750 ℃, within rolling in back 10 seconds, can not take place dynamically and static state crystallization again, the rolling deformation of crystal grain only can take place.Be cooled to 400～650 ℃ temperature range with steel pipe rapidly with the cooling velocity of 5～50 ℃/S this moment, can form tiny bainite structure, production high-performance N80 and above steel-grade bushing.
The difference of the present invention and prior art and improvement
At present the tandem rolling tube machine tube-rolling technique that generally adopts in countries in the world is: 1250～1300 ℃ of pipes add hot piercing, 950～1050 ℃ of tandem rollings, plugs take off rod back steel pipe be heated to again steel pipe that 950～980 ℃ of austenitizings handle, come out from reheating furnace through stretch-reducing mill in 920～950 ℃ of tube rollings, roll the back air cooling to room temperature.
The present invention compares difference with above-mentioned technology and is, without heating again, with the speed of 5～50 ℃/S, is cooled fast between 400～650 ℃ after the finish to gauge between steel pipe tandem rolling and tube reducing, and air cooling is to room temperature then.The tube-rolling technique of after-acceleration cooling is rolled in employing, can utilize the non-hardened and tempered steel kind with hot rolling attitude production high-performance oil well pipe, and needn't carry out modified heat treatment, can reduce production costs greatly.
Table 1 tube-rolling technique relatively
| Heating furnace | Punch | Tandem mill | Recrystallization | Heating again | Reducing mill | Roll the back cooling | |
| The U.S. 5186769 | ??1200℃ ??～1300℃ | ??～1200℃ | ??～1000℃ | Be lower than Ar1 | ??900℃ ??～950℃ | ??700℃ ??～800℃ | Be as cold as 600 ℃ with 3～5 ℃/S |
| Britain 2101014A | ??1200℃ ??～1300℃ | ??～1200℃ | ??～1000℃ | Be lower than Ar1 | ??850℃ ??～980℃ | ??850℃ ??～900℃ | Be as cold as soon below 600 ℃ |
| Britain 2137539A | ??1150℃ ??～1220℃ | ??～1100℃ | ??～1000℃ | Be lower than Ar1 | ??700℃ ??～850℃ | ??700℃ ??～800℃ | Be as cold as 450～600 ℃ with 〉=6 ℃/S |
| The present invention | ??1200℃ ??～1320℃ | ??～1200℃ | ??～1000℃ | Need not be recrystallized | Do not need to heat again | ??750℃ ??～900℃ | Be as cold as 400～650 ℃ with 5～50 ℃/S |
The steel pipe that above-mentioned 3 patents all require tandem rolling to take off behind the rod is cooled to below the Ac1 temperature, through once by austenite behind ferritic recrystallization, enter the reheating furnace reaustenitizing again.The present invention is different with its process route, and tandem rolling takes off and do not require behind the rod and be cooled to below the Ac1 temperature, and the refinement that is recrystallized can directly enter reducing mill, has simplified tube-rolling technique.
Aspect the acceleration cooling after hot rolling, require to cool off with high speed at once after rolling simultaneously, because cooling velocity is fast, cool time is short, helps the layout of accelerated cooling device.For example, steel pipe advances with 2M/S speed, is cooled to 550 ℃ from 750 ℃, if cooling velocity is 50 ℃/S, cooling off 200 ℃ only needed for 4 seconds, the cooling device that 8M is long, if cooling velocity 5 ℃/below the S, cooling off 200 ℃ so just needed for 40 seconds, and the long device of 80M has been set.
Countries in the world generally adopt quenched and tempered steel to produce the N80 oil well pipe at present, because quenched and tempered steel is to add tempering by quenching to obtain tissues needed and performance, all control low N content in the steel; Therefore and non-hardened and tempered steel of the present invention mainly is to improve performance by the carbide precipitation strength, utilizes higher N and carbide to separate out element V, Ti, Nb, Mo combine, the intensity of raising material.
Except that quenched and tempered steel, produce the non-hardened and tempered steel of N80 oil well pipe in early days, with steel grade of the present invention essential difference is arranged also as 42MnMo7,42MnCr52 etc.After only being adapted at rolling, produces above-mentioned steel grade the N80 oil well pipe under the condition of air cooling, because it is slower to roll the cooling velocity of back air cooling, can only obtain ferrite and add pearlitic tissue, must rely on raising C content to improve intensity, but raising along with C content, toughness reduces greatly, has not satisfied the requirement of people to the high-performance oil well pipe.Steel grade of the present invention has reduced C content, helps improving the toughness of material, passes through to improve N content simultaneously and adds more carbide former, and improve intensity in conjunction with the acceleration cooling.
In recent years, the someone begins that steel pipe is rolled the after-acceleration process for cooling and studies successively in the world, cooperates the research of technology, has also delivered some article and patents about the steel grade aspect accordingly.
Wherein United States Patent (USP) 5019180, BP GB2137539A and one piece of paper: the steel grade of≤Metallurgical Design of Accelerated-Cooling Process for Seamless PipeProduction 〉=proposition is the low C micro alloyed steel that does not contain N, C content is all below 0.18%, utilize V, Ti, Nb precipitation strength, quickening to obtain tiny ferritic structure under the cooling condition, to produce X series line pipe.And steel grade of the present invention mainly adds N, can more effectively improve intensity.
The invention more approaching with the present invention is a United States Patent (USP) in 1993: 5186769.Its main component is C 0.10～0.18%, and Mn 0.1～2.0%, and V 0.1～0.16%, and Ti 0.008～0.012%, and N 0.015～0.022%.Mentality of designing and the present invention of this steel grade are close, all are to separate out main means as material reinforcement with the carbonitride of V, Ti.The maximum difference of this steel grade and steel grade of the present invention is that carbon content is lower, can only obtain the tissue based on ferrite after finish to gauge.And the present invention has the content of alloys such as higher C and Mo, can obtain the tissue based on bainite, thereby guarantees the uniformity of inside and outside hardness of cooling back steel pipe and intensity.
Description of drawings
Fig. 1 is the metallographic structure (ferrite+pearlite) of steel grade of the present invention under conventional tube-rolling technique;
Metallographic structure (bainite structure) optical microscope photograph of Fig. 2 a back 5 ℃/S cooling for steel grade of the present invention rolls under invented technology;
Metallographic structure (bainite structure) stereoscan photograph of Fig. 2 b back 5 ℃/S cooling for steel grade of the present invention rolls under invented technology;
The metallographic structure of Fig. 3 a back 55 ℃/S cooling (bainite+a small amount of island martensite body) optical microscope photograph for steel grade of the present invention rolls under invented technology;
The metallographic structure of Fig. 3 b back 55 ℃/S cooling (bainite+a small amount of island martensite body) stereoscan photograph for steel grade of the present invention rolls under invented technology.
The specific embodiment
The present invention will be further described below by embodiment.
Concrete chemical composition sees Table 2, with them with two kinds of different process tube rollings: a kind of is by original common process tube rolling, rolls air cooling afterwards; Another kind is by technology tube rolling of the present invention, rolls the after-acceleration cooling.
The mechanical property of two kinds of technologies the results are shown in Table 3.By table 3 as seen, adopt steel grade of the present invention and technology, as B2, B3, B4, B5 composition, the yield strength of rolling the back steel pipe can satisfy the requirement of N80 sleeve pipe yield strength between 552～758Mpa all greater than 600Mpa.
Table 2 unit: mass percent
| Numbering | ??C | ??Si | ??Mn | ??V | ??Ti | ??N | ??Al | ??Mo | ??Nb | ??Fe |
| ??B1 | ??0.14 | ??0.26 | ??1.73 | ??0.14 | ??0.012 | ??0.016 | ??0.017 | ??0.29 | ??/ | Surplus |
| ??B2 | ??0.22 | ??0.27 | ??1.47 | ??0.16 | ??0.013 | ??0.017 | ??0.023 | ??0.14 | ??/ | Surplus |
| ??B3 | ??0.26 | ??0.25 | ??1.47 | ??0.060 | ??0.010 | ??0.014 | ??0.016 | ??/ | ??/ | Surplus |
| ??B4 | ??0.26 | ??0.29 | ??1.49 | ??0.059 | ??0.010 | ??0.018 | ??0.018 | ??0.14 | ??/ | Surplus |
| ??B5 | ??0.25 | ??0.31 | ??1.42 | ??0.064 | ??0.009 | ??0.016 | ??0.019 | ??/ | ??0.026 | Surplus |
| ??B6 | ??0.25 | ??0.35 | ??1.42 | ??0.062 | ??0.010 | ??0.0083 | ??0.018 | ??0.15 | ??0.030 | Surplus |
Table 3 mechanical property
Adopt steel grade of the present invention, under conventional tube-rolling technique, it rolls the back metallographic structure is that ferrite adds pearlite, and its microhardness only about 150Hv10, does not reach the requirement of N80 grade of steel requirement hardness more than 220Hv10, sees Fig. 1.
Adopt steel grade of the present invention, under tube-rolling technique of the present invention, be cooled to 400 ℃ from 750 ℃ with the cooling velocity of 5 ℃/s, it rolls the back metallographic structure based on bainite, its microhardness has reached the requirement of N80 grade of steel requirement hardness more than 220Hv10 about 228Hv10, see Fig. 2 a, Fig. 2 b.
Adopt steel grade of the present invention, under tube-rolling technique of the present invention, cooling velocity with 55 ℃/S is cooled to 400 ℃ from 750 ℃, it rolls the back metallographic structure is that bainite adds a small amount of island martensite body, its microhardness reaches 266Hv10, for avoiding occurring martensite, should with roll the back cooling velocity be controlled at 50 ℃/below the S, see Fig. 3 a, Fig. 3 b.
Claims (2)
1. method of manufacturing seamless steel pipe, it comprises the steps:
1) the composition quality percentage of pipe is: C:0.22～0.4%, Si:0.1～0.5%, Mn:1.0～2.0%, V:0.05～0.25%, Al:0.005～0.050%, N:0.015～0.030%, surplus are Fe and inevitable impurity;
2) pipe after 1200～1320 ℃ of heating, 1150～1250 ℃ of perforation, then at 900～1050 ℃ of tube rollings, enters the reducing mill group after taking off rod through punch through rotary heating furnace, rolls into steel pipe at 750～850 ℃;
3) steel pipe water or water aerating within 10 seconds after reducing mill comes out with the cooling velocity of 5～50 ℃/S, is cooled fast between 400～650 ℃, and air cooling then, the steel pipe behind the air cooling are pressed production tube delivery after inspection.
2. method of manufacturing seamless steel pipe as claimed in claim 1 is characterized in that, described pipe composition also comprises: one or more in Mo:0.10～0.40%, Nb:0.01～0.05%, Ti:0.005～0.05%, by percentage to the quality.
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| CN116590618A (en) * | 2023-05-17 | 2023-08-15 | 延安嘉盛石油机械有限责任公司 | Oil sleeve joint and preparation method thereof |
| CN116590618B (en) * | 2023-05-17 | 2023-12-29 | 延安嘉盛石油机械有限责任公司 | Oil sleeve joint and preparation method thereof |
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