CN101579816A - New method for manufacturing high alloy steel seamless pipe with heavy calibre by adopting steel pipe continuous rolling mill - Google Patents
New method for manufacturing high alloy steel seamless pipe with heavy calibre by adopting steel pipe continuous rolling mill Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 44
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- 238000004519 manufacturing process Methods 0.000 title abstract description 17
- 239000004429 Calibre Substances 0.000 title abstract 2
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- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a new method for manufacturing a high alloy steel seamless pipe with heavy calibre by adopting a steel pipe continuous rolling mill, comprising: molten high alloy steel which is externally refined is made into a hollow shell by centrifugal casting; the outside surface of the front end of the hollow shell is processed to be a 'gripping head' with conicity, and machining and quality inspection are carried out on the inside and the outside surfaces as well as the 'gripping head' at the front end of the hollow shell; the hollow shell undergoing machining and quality inspection is heated; a mandril is introduced into the heated hollow shell, and then the hollow shell is sent into the steel pipe continuous rolling mill for continuous rolling, so that the pipe fittings having the wall thickness, the diameter and the length being in accordance with the requirements can be produced; finally, the qualified finished pipes can be obtained after sizing, cooling, heat treatment and finishing operation. The technique shortens the process flow and reduces the cost; the step of perforation is omitted, thus improving the quality and the qualification rate of the product; the small tapered 'gripping head' at the front end conduces to improving primary and secondary gripping conditions of rolling parts, quickly setting up stable rolling process and improving the deformation capability and the rolling stability of the whole mill.
Description
Technical field:
The present invention relates to the manufacturing technology of seamless steel pipe, relate in particular to the manufacturing technology of heavy caliber, middle heavy wall, unmanageable high alloy steel high-end seamless tubular goods.
Background technology:
Steel have good comprehensive serviceability, and can under different working conditions, bear desired load and have the required cycle in service life, and processing performance is good, be the indispensable important foundation material of the development of the national economy.In general, the carbon-iron alloy of phosphorus content 0.02%-2% is called steel, phosphorus content is called cast iron greater than 2% carbon-iron alloy.According to the different criteria for classifying, steel can be divided into different classifications.Chemical composition according to steel can be divided into carbon steel and steel alloy:
Composition in the carbon steel also contains minor amount of silicon, manganese, phosphorus, sulphur, oxygen and the nitrogen etc. that are difficult to Ex-all in smelting except iron and carbon.According to the phosphorus content size, carbon steel is divided into mild steel (carbon containing is less than 0.25%), medium carbon steel (carbon containing 0.25%～0.6%) and high-carbon steel (carbon containing is greater than 0.6%).
Steel alloy is the steel that specially adds or surpass the alloying element that carbon steel limits the quantity of, so that make properties such as its intensity that has general carbon steel and can not possess, toughness, corrosion resistance, wearability, hear resistance, red hardness.These alloying elements comprise manganese, silicon, alum, chromium, nickel, titanium, vanadium etc.The alloying element total content is a low-alloy steel less than 5%, and 5%～10% is medium alloy steel, is high-alloy steel greater than 10%.
Steel has good processing characteristics generally speaking, but raising along with alloying element content, steel alloy particularly high-alloy steel all shows as generally speaking: thus process plastic descends, the deformation temperature interval narrows down, fragility increases, resistance of deformation strengthens and makes difficulty of processing increasing, therefore the difficulty of processing of high-alloy steel product is bigger, not only consumptive material, consuming time, cost is high, and difficult quality is guaranteed.Especially shaping of high-alloy steel seamless tubular goods is one of manufacturing difficult problem of puzzlement seamless steel pipe always.
As one of key character of modern steel pipe manufacturing technological progress, with PQF three-roll continuous rolling unit is that the steel pipe continuous rolling technology of representative has obtained development attracting people's attention, and makes it to become the representative tube rolling unit of a kind of high production capacity, high accuracy, high automation level.The insider assert reasonablely that always this class steel pipe rolling mill group is fit to produce all kinds of medium-small diameter with batch property, the special-purpose tubing of middle thin-walled, and adopts the superiority of continuous casting billet production carbon steel, low-alloy steel tubing also very remarkable.At this moment, comprise that whole rolling production process quite stable, the technology of perforation is also very ripe.But, in the face of all kinds of high-alloy steel, the high alloy steel high-end pipe of especially middle heavy caliber (external diameter is more than Φ 250mm), middle heavy wall (diameter-wall-rate is below 25), such steel pipe rolling mill group but demonstrates far away as the due advantage of a kind of severe deformation unit.One of them reason is, it will directly adopt continuous casting billet to produce the high-end tubing of high-alloy steel again by the steel pipe rolling mill group through perforation, and this remains technically in many problems, remains further to be solved.
The existing technological process of adopting the steel pipe rolling mill group to make seamless steel pipe is:
Be shaped → heat → decide tube reducing → cooling → finished product heat treatment → back finishing → finished product again through molten steel → continuous casting → circle base cut-out → (cogging of the heating → forging rolling) → removing surface → heating → heat centering of external refining, the tandem rolling that de-scaling → perforation → assurance obtains lengthening coefficient 3-5.(as shown in Figure 1).
Adopt above-mentioned prior art, produce all kinds of high-alloy steel heavy calibers, the high-end tubing of middle heavy wall on the steel pipe rolling mill group, maximum limitation comes from the perforation of continuous casting billet and the quality level of used pipe thereof.On the one hand, the quality of high-alloy steel continuous casting billet itself need improve and stablize; On the other hand, perforation also is difficult to guarantee to reach the quality requirement of expection, because steel alloy particularly high-alloy steel forms vestibule and promptly produces so-called " Mannesmann effect " in heart position very easily therein in perforation procedure, thereby stay all surfaces and the defective inherence.The vestibule of exposed type is fold defect in inwall then often forms, and the enclosed type vestibule then easily produces all kinds of lamination defects.These defectives usually all are counted as fatefulue for high-end tubing.Therefore, for bigbore high alloy steel high-end seamless steel pipe, the manufacturing process of " zero punch defective " is the long-term target of pursuing of steel pipe circle personage always.
Summary of the invention:
The present invention under the above-mentioned background technical conditions, through researching and developing the new process of the heavy caliber that draws, middle heavy wall, difficult high alloy steel high-end seamless steel tube production of being out of shape with great concentration, is specially just:
A kind of new method that adopts the steel pipe rolling mill group to make the high alloy steel high-end seamless tubular goods comprises following processing step:
The first step becomes hollow bloom through the high-alloy steel molten steel of external refining by centrifugal casting machine centrifugal casting;
In second step, the front end outer surface of described hollow bloom is processed into " head of nipping " of band tapering, and the surfaces externally and internally of described hollow bloom and " head of nipping " of described front end are carried out machined and quality examination;
In the 3rd step, the described hollow bloom after machined and the quality examination is heated;
The 4th step imported plug and carried out continuous rolling on described steel pipe rolling mill group the described hollow bloom after the heating, made the satisfactory pipe fitting of wall thickness, diameter and length;
The 5th step, described pipe fitting is carried out sizing, cooling, heat treatment, finishing, make qualified finished product tubing.
Wherein, the described centrifugal casting of the first step is to carry out on the rotation of casting mold and horizontal sextant angle are the horizontal centrifugal casting machine of 0 degree, and the hollow bloom that centrifugal casting goes out is for waiting penetrating hollow bloom in two ends of wall thickness.
In described second step, it is 1 that the front end 250mm length outer surface of described hollow bloom is processed into tapering: " head of nipping " of (1500～2000)/D, and D is for being the diameter of the described pipe of unit with the millimeter;
Machined described in second step is the machining that " head of nipping " of the surfaces externally and internally of described hollow bloom that centrifugal casting is become and described front end carries out.
Further, the thickness of cutting of described hollow bloom inner surface is no less than 5 millimeters, the thickness of cutting of described hollow bloom outer surface is no less than 2 millimeters.
The described thermal recovery associating heating that adds of the 3rd step promptly adopts combustion gas heating in the stove below 800 ℃, 800 ℃～1200 ℃ are adopted eddy-current heating.
When described hollow bloom of the 4th step imported plug and carry out continuous rolling on described steel pipe rolling mill group, the total coefficient of elongation was more than or equal to 3.
Further, described steel pipe rolling mill group comprises many pipe mills, and the ratio of width to height of first pipe mill in the described steel pipe rolling mill group and the roll pass of second pipe mill is 1.26～1.29.
The deflection of first pipe mill of described steel pipe rolling mill group, second pipe mill and the 3rd pipe mill is respectively 18～22%, and 22～26%, 24～28%, the deflection of last two pipe mills is respectively 0.5～1.0% and 0.3～0.5%.
The 5th described finishing of step comprises machined and the aligning that as required described pipe fitting is carried out.
Adopt above-mentioned processing method of the present invention, set up technologic the contact between first that high-quality centrifugal casting base and technology maturation, deformation condition is the more satisfactory steel pipe rolling mill group, especially be used for producing heavy caliber, heavy wall, unmanageable high-alloy steel seamless tubular goods, formed a kind of energy-conservation, high-quality, economy and be different from a kind of short flow process production new technique of the production high alloy steel seamless steel pipe of conventional method.
Said method of the present invention has the following advantages with respect to existing processing technology:
1, adopts this patent method to produce heavy caliber high-alloy steel seamless tubular goods, need not the perforation work step that number of drawbacks appears in special arrangement easily, and correspondingly reduced hot centering and step such as heating again, shortened technological process, reduced cost;
2, adopt this patent method, need not " perforation " work step, really realized " zero punch defective ", for have on the steel pipe rolling mill group of severe deformation ability produce difficult distortion, high-precision high alloy steel high-end pipe is laid a good foundation, and has improved product quality and product percent of pass;
3, adopt the method for this patent, can also before heating, check, drop into follow-up heating and tandem rolling operation again after qualified, be convenient to the control of finished product quality, help to improve the qualification rate of product the quality of hollow bloom.Adopt existing technology then can not the workpiece quality that enter down after the perforation before the road tandem rolling operation to be detected, thereby probably cause the uneven workpiece of quality, cause the finished product difficult quality to be effectively controlled all by subsequent handling;
4, adopt this patent method, need not the perforation process that number of drawbacks appears in special arrangement easily, for production deformation temperature interval high alloy steel high-end pipe narrow, that drag is big provides more favourable temperature conditions, and can be reduced by at least and once heat link again and shorten heat time heating time, but energy savings about 10%;
5, this patent method is a kind of tube-making process of lacking flow process, can reduce by 2-3 link at least, and does not need expensive large-tonnage cogging equipment, thereby obviously reduces equipment investment and the operating cost and the floor space in tubulation workshop;
6, this patent method is owing to employing dense structure, mechanical performance are better, defective centrifugal casting pipes still less such as pore, shrinkage cavity, slag inclusion, coarse grain, under the identical situation of deformation condition, this patent method can obtain surface quality and combination property special-purpose tubing more good, that can be used for important events;
7, adopt this patent method, the hollow ingot that front end has a little tapering " head of nipping " will help to improve rolled piece once, the secondary bite condition, can set up the stable operation of rolling fast.This production to the narrower high alloy steel pipe of processing temperature scope is very favourable, has improved the deformability of whole unit;
8, adopt this patent method, pipe fitting carries out the whole process of continuous rolling on the steel pipe rolling mill group and since adopt centrifugal casting make that hollow ingot makes that process becomes very steadily, the dimensional accuracy height after the processing, and can reduce the material consumption of cutting head cutting tail.
Description of drawings:
Fig. 1 is the process flow diagram of prior art;
Fig. 2 is the process flow diagram of this patent;
Fig. 3 is the process flow diagram of this patent one embodiment.
The specific embodiment:
As shown in Figure 3, produce an embodiment of the unmanageable 1Cr18Ni9 austenite stainless of Φ 273x28x8000mm steel seamless steel tube for employing steel pipe rolling mill group provided by the invention, its processing step is:
The first step is cast into hollow bloom with 2130mm multiple length long Φ 402x94mm by centrifugal casting machine with it through the 1Cr18Ni9 of external refining molten steel.In this step, described external refining molten steel is same as the prior art, repeats no more here; Described centrifugal casting is to carry out on the rotation of casting mold and horizontal sextant angle are the horizontal centrifugal casting machine of 0 degree, and the hollow bloom that centrifugal casting goes out is for waiting penetrating hollow bloom in two ends of wall thickness.Adopt centrifugal casting machine to process easily, in high quality and be used for the hollow bloom that subsequent step uses, and do not need similar prior art to the cogging again of continuous casting steel ingot, hot centering and perforation etc., not only shortened whole process flow, and really realized " zero punch " and " zero punch defective "; And by the pipe that centrifugal casting obtains, inner grainiess more helps the rolling of subsequent step, can effectively guarantee the quality of follow-up crudy and finished product pipe.As for centrifugal casting machine, obtained promotion and application at the cast iron pipe production field, can be directly used in this patent, its structure and principle are also repeated no more here.
Second step, it is 1: 4.17 " head of nipping " that the front end 250mm length outer surface of described hollow bloom is processed into tapering, the range of taper of this moment described " head of nipping " is 1: choose between 1500/D～2000/D, promptly can choose between 1: 3.75～5 for the pipe of present embodiment Φ 400mm, present embodiment is preferably 1: 4.17; And the surfaces externally and internally of described hollow bloom and described front end " head of nipping " carried out machined and quality examination, thickness of cutting to described hollow bloom inner surface is 5 millimeters, thickness of cutting to described hollow bloom outer surface is 2 millimeters, obtains being of a size of the pipe of Φ 400x87x2130mm.This machining steps can be removed the coarse inner and outer surface layers of hollow bloom and the impurity of separating out, and removes other defectives such as crackle on the inner and outer surface layers, bubble, guarantees the fineness of hollow bloom surfaces externally and internally, can improve the quality of the finished product after the processing greatly.
Described quality examination comprises defect inspection, to there be mass defect and exclude outside the described process of the application through still undesirable hollow bloom after the reconditioning, can guarantee that like this hollow bloom that the later stage is used for tandem rolling all is qualified blanks, can improve end product quality, reduce the generation of waste product.
In the 3rd step, the described hollow bloom after machined and the quality examination is heated.Add thermal recovery associating heating, promptly adopt combustion gas heating in the stove below 800 ℃, 800 ℃～1200 ℃ are adopted eddy-current heating.
The 4th step, the described hollow bloom after the heating is inserted the plug of Φ 215mm and carry out continuous rolling on the steel pipe rolling mill group, shut out the pipe fitting that is of a size of Φ 273x28x8500mm.For this reason, set first pipe mill in the described steel pipe continuous rolling-tube unit and roll pass the ratio of width to height of second pipe mill and be respectively 1.26 and 1.28; The deflection of first pipe mill, second pipe mill and the 3rd pipe mill is respectively 20%, 23%, 24%; The deflection of last two pipe mills is respectively 0.6% and 0.4%.Finish whole continuous rolling process on 8-9 frame pipe mill, the total coefficient of elongation is 4.
The 5th step, described pipe fitting is carried out sizing, cooling, make the size of finished product and tolerance meet the requirements, again through solution heat treatment, finishing, crop, back-end crop are then made the qualified finished product tubing of Φ 273x28x8000mm at last.Described finishing comprises machined and the aligning that as required described pipe fitting is carried out, to satisfy the requirement under the different environments for use.
The present invention at first creatively adopts centrifugal casting to prepare the aforementioned production method of hollow bloom, be particularly suitable for making bore more than 250 millimeters, diameter-wall-rate is at the heavy caliber below 25, the high-end seamless high alloy steel pipe of middle heavy wall.If the bore of tubing is too small, for example below 100 millimeters, then be difficult to embody the advantage of centrifugal casting base; Wall thickness is thin excessively, and continuous rolling process high-alloy steel pipe fitting temperature drop is excessive, and resistance of deformation increases severely, and can have influence on the stability of the operation of rolling.
Detailed description of the above embodiment of the present invention and accompanying drawing, purpose are to make an explanation by literal and diagram, and do not lie in the protection domain that limits claim.Various variations on the described specific embodiment of present specification; be conspicuous to those skilled in the art; and be in the protection domain of claim and equivalent technologies thereof any change of claim of the present invention, content that modification all belongs to the present invention's protection of not breaking away from.
Claims (10)
1, a kind of new method that adopts the steel pipe rolling mill group to make the high-alloy steel seamless tubular goods comprises following processing step:
The first step becomes hollow bloom through the high-alloy steel molten steel of external refining by centrifugal casting machine centrifugal casting;
In second step, the front end outer surface of described hollow bloom is processed into " head of nipping " of band tapering, and the surfaces externally and internally of described hollow bloom and " head of nipping " of described front end are carried out machined and quality examination;
In the 3rd step, the described hollow bloom after machined and the quality examination is heated;
The 4th step imported plug and carried out continuous rolling on described steel pipe rolling mill group the described hollow bloom after the heating, made the satisfactory pipe fitting of wall thickness, diameter and length;
The 5th step, described pipe fitting is carried out sizing, cooling, heat treatment, finishing, make qualified finished product tubing.
2, new method according to claim 1, it is characterized in that: the described centrifugal casting of the first step is to carry out on the rotation of casting mold and horizontal sextant angle are the horizontal centrifugal casting machine of 0 degree, and the hollow bloom that centrifugal casting goes out is for waiting penetrating hollow bloom in two ends of wall thickness.
3, new method according to claim 1, it is characterized in that: in described second step, it is 1 that the front end 250mm length outer surface of described hollow bloom is processed into tapering: " head of nipping " of (1500～2000)/D, D is for being the diameter of the described pipe of unit with the millimeter.
4, new method according to claim 1 is characterized in that: the machined described in second step is the machining that " head of nipping " of the surfaces externally and internally of described hollow bloom that centrifugal casting is become and described front end carries out.
5, new method according to claim 4 is characterized in that: the thickness of cutting to described hollow bloom inner surface is no less than 5 millimeters, and the thickness of cutting of described hollow bloom outer surface is no less than 2 millimeters.
6, new method according to claim 1 is characterized in that: the described thermal recovery associating heating that adds of the 3rd step, promptly adopt combustion gas heating in the stove below 800 ℃, and 800 ℃～1200 ℃ are adopted eddy-current heating.
7, new method according to claim 1 is characterized in that: when described hollow bloom of the 4th step imported plug and carry out continuous rolling on described steel pipe rolling mill group, the total coefficient of elongation was more than or equal to 3.
8, new method according to claim 7 is characterized in that: described steel pipe rolling mill group comprises many pipe mills, the ratio of width to height 1.26～1.29 of first pipe mill in the described steel pipe rolling mill group and the roll pass of second pipe mill.
9, new method according to claim 8, it is characterized in that: the deflection of first pipe mill of described steel pipe rolling mill group, second pipe mill and the 3rd pipe mill is respectively 18～22%, 22～26%, 24～28%, the deflection of last two pipe mills is respectively 0.5～1.0% and 0.3～0.5%.
10, new method according to claim 1 is characterized in that: the 5th described finishing of step comprises machined and the aligning that as required described pipe fitting is carried out.
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| CN2009100873026A CN101579816B (en) | 2009-06-17 | 2009-06-17 | New method for manufacturing high alloy steel seamless pipe with heavy calibre by adopting steel pipe continuous rolling mill |
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| CN2009100873026A CN101579816B (en) | 2009-06-17 | 2009-06-17 | New method for manufacturing high alloy steel seamless pipe with heavy calibre by adopting steel pipe continuous rolling mill |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560283A (en) * | 2012-02-21 | 2012-07-11 | 张芝莲 | Big-caliber seamless alloy steel pipe |
| CN102615476A (en) * | 2012-01-19 | 2012-08-01 | 南京理工大学 | X70-level large-aperture thick-wall seamless pipe for deep sea and manufacturing method of pipe |
| CN112238141A (en) * | 2020-09-29 | 2021-01-19 | 江苏天淮钢管有限公司 | Hot continuous rolling production method of 508 mm large-caliber extra-thick-wall seamless steel pipe |
| CN113680985A (en) * | 2021-08-26 | 2021-11-23 | 北京钢研高纳科技股份有限公司 | Preparation method of low-cost short-process high-temperature alloy seamless tube |
-
2009
- 2009-06-17 CN CN2009100873026A patent/CN101579816B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615476A (en) * | 2012-01-19 | 2012-08-01 | 南京理工大学 | X70-level large-aperture thick-wall seamless pipe for deep sea and manufacturing method of pipe |
| CN102560283A (en) * | 2012-02-21 | 2012-07-11 | 张芝莲 | Big-caliber seamless alloy steel pipe |
| CN112238141A (en) * | 2020-09-29 | 2021-01-19 | 江苏天淮钢管有限公司 | Hot continuous rolling production method of 508 mm large-caliber extra-thick-wall seamless steel pipe |
| CN113680985A (en) * | 2021-08-26 | 2021-11-23 | 北京钢研高纳科技股份有限公司 | Preparation method of low-cost short-process high-temperature alloy seamless tube |
| CN113680985B (en) * | 2021-08-26 | 2022-04-29 | 北京钢研高纳科技股份有限公司 | Preparation method of low-cost short-process high-temperature alloy seamless tube |
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