CN202438543U - Punching and rolling equipment of high-alloy difficultly deformable seamless steel pipe - Google Patents

Punching and rolling equipment of high-alloy difficultly deformable seamless steel pipe Download PDF

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Publication number
CN202438543U
CN202438543U CN2012200112037U CN201220011203U CN202438543U CN 202438543 U CN202438543 U CN 202438543U CN 2012200112037 U CN2012200112037 U CN 2012200112037U CN 201220011203 U CN201220011203 U CN 201220011203U CN 202438543 U CN202438543 U CN 202438543U
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China
Prior art keywords
pipe
punching
alloy
rolling
steel pipe
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CN2012200112037U
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Chinese (zh)
Inventor
黎福华
陈剑南
朱萍
吴虎
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Daye Special Steel Co Ltd
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Hubei Xinyegang Steel Co Ltd
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Priority to CN201120568042.7 priority
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Priority to CN2012200112037U priority patent/CN202438543U/en
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Abstract

The utility model provides punching and rolling equipment of a high-alloy difficultly deformable seamless steel pipe. The punching and rolling equipment comprises a heating furnace, a punching machine and a pipe rolling mill, wherein the heating furnace is used for heating a pipe blank and a rough pipe after primary punching; the punching machine is used for performing primary punching on the heated pipe blank or performing secondary punching on the rough pipe after primary punching; the pipe rolling mill is used for performing wall reduction extension rolling on the rough pipe after secondary punching; the punching machine is provided with two kinds jacking heads, which are water cooling steel jacking heads and molybdenum base jacking heads respectively; the molybdenum base jacking heads are adopted during primary punching of the punching machine; and the water cooling steel jacking heads are adopted during secondary punching. Through the punching and rolling equipment of the high-alloy difficultly deformable seamless steel pipe, the high-alloy seamless steel pipe is successfully rolled; the life of the jacking heads is greatly prolonged; 30 steel pipes can be averagely rolled on each molybdenum base jacking head; the quality of the inner surface of the steel pipe is improved; and the field rejection rate is greatly reduced.

Description

The drilling/rolling equipment of the difficult distortion of high alloy seamless steel pipe
Technical field
The utility model relates to the perforating steel pipe rolling equipment under the rolling metal processing technology in the ferrous materials production field, particularly the drilling/rolling equipment of the difficult distortion of high alloy seamless steel pipe.
Background technology
At present, in the smelter seamless steel pipe production, punch is one of seamless steel tube production capital equipment, and the top is the important tool that punch is bored a hole on pipe.
In seamless steel tube production; Usually with unit plug rolling unit, pipe expanding set, diagonal rolling pipe mill unit etc. are arranged, the technological process of wherein adopting the diagonal rolling pipe mill unit to produce seamless steel pipe is generally: heating furnace heating → punch perforation → diagonal rolling pipe mill is rolling → and the slight stretch sizing mill sizing.
And; Aspect the top of perforation usefulness; Though molybdenum base top has case hardness height, wear-resisting advantage; But because there is a following shortcoming: molybdenum alloy top head be prone to when under the rapid heat cycle state, work burst and reducing steel bonding often appears in service life, the perforation procedure or press against the hole and influence inner surface quality, the molybdenum resource shortage causes molybdenum plug production cost height, thereby people have abandoned gradually that use molybdenum base comes directly towards and the common tops such as steel top of adopting various improvement in piercing process.
But, in the drilling/rolling method of current high-alloy seamless steel pipe, use the steel top to have following variety of issue.
The pipe alloy content is high more, and resistance of deformation is big more during perforation, and head lifetime is short more, and it is more difficult to bore a hole.The high-alloy steel alloy content adopts common top greater than 10% during perforation, in perforation procedure, the effect of alternating thermal stress, frictional force and mechanical force is being born in the top, and the top is prone to produce distortion, scratches the hollow billet inner surface, skin lamination defect in producing after the steel bonding; Because the pipe resistance of deformation is too big, come directly towards easy to wearly, to break, the life-span is low, even is difficult to accomplish perforation procedure.
Before top contact pipe, often be prone to the metal center fracture phenomena, interconnect when a large amount of breaches develop into, after the expansion in flakes, the metal continuity is destroyed, and cavity, formation center is a vestibule.In perforation procedure, form vestibule too early, can cause a large amount of interior folding defectives, worsen the steel pipe internal-surface quality, even form waste product.The natural plasticity of steel is determined by chemical composition, metal smelt quality and the metal structure state of steel, and structural state is influenced by the heating of pipe blank temperature and time.In general, high-alloy steel plasticity is low, and punching quality is poor, is easy to generate vestibule.Adopt once perforated, reduction ratio is big before the top, and the distortion degree of irregularity is big, causes the shearing stress of pipe center and tension to increase, thereby promotes the formation of vestibule easily, influences product quality.
In a word, not enough below common piercing process exists: common head lifetime is low; The once perforated probalility of success is low; Steel pipe internal-surface is of poor quality, defectives such as pipe, implosion in being prone to produce.
The utility model content
The purpose of the utility model is to address the above problem, and provides a kind of and can fall successfully rolling high-alloy seamless steel pipe, prolongs head lifetime, the drilling/rolling method of the rate of reducing the number of rejects and seconds and drilling/rolling equipment.
The first aspect of the utility model provides the drilling/rolling equipment of the difficult distortion of a kind of high alloy seamless steel pipe, and this drilling/rolling equipment comprises: heating furnace, heat the hollow billet behind pipe and the once perforated; Punch carries out once perforated or the hollow billet behind the once perforated is carried out secondary punch the pipe after the heating; And pipe mill, the hollow billet behind the secondary punch is subtracted rolling that wall extends, punch is equipped with two kinds of tops, is respectively water cooled steel top and molybdenum base top, when punch carries out once perforated, adopts molybdenum base top, adopts the water cooled steel top when carrying out secondary punch.
In the drilling/rolling equipment of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: the composition of said molybdenum base top is Ti:1.0~2.0wt%, Zr:0.1~0.5wt%, and C:0.1~0.5wt%, all the other are molybdenum.
In the drilling/rolling equipment of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: the composition (percetage by weight wt%) of said water cooled steel top is C:0.19~0.23, Si:0.90~1.10; Mn:0.70~0.90, Cr:1.40~1.80, Ni:2.30~2.50; Mo:0.30~0.40, W:1.60~1.70, S :≤0.025; P≤0.025, all the other are Fe.
In the drilling/rolling equipment of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: said molybdenum base top comes directly towards for water-cooled not, and water cooling plant is not set in it.
In the drilling/rolling equipment of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: the two ends shutoff of hollow billet had exotic material when the hollow billet behind the once perforated heated in heating furnace.
In the drilling/rolling equipment of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: said punch is two-roll piercer or three-roll piercer.
The drilling/rolling of the first aspect of the utility model sets corresponding the drilling/rolling method of the difficult distortion of a kind of high alloy seamless steel pipe, and this drilling/rolling method comprises: a heating process utilizing heating furnace that pipe is heated; Pipe after utilizing punch and molybdenum base top to heating carries out the once perforated operation of once perforated; With the post bake operation that the hollow billet that obtains behind the pipe once perforated utilizes heating furnace to heat once more, utilize punch and water cooled steel top the hollow billet of heating once more to be carried out the secondary punch operation of secondary punch; With the rolling process that the hollow billet behind the secondary punch is subtracted the wall extension.
In the drilling/rolling method of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: the composition of said molybdenum base top is Ti:1.0~2.0wt%, Zr:0.1~0.5wt%, and C:0.1~0.5wt%, all the other are molybdenum.
In the drilling/rolling method of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: the composition (percetage by weight wt%) of said water cooled steel top is C:0.19~0.23, Si:0.90~1.10; Mn:0.70~0.90, Cr:1.40~1.80, Ni:2.30~2.50; Mo:0.30~0.40, W:1.60~1.70, S :≤0.025; P≤0.025, all the other are Fe.
In the drilling/rolling method of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: said molybdenum base top comes directly towards for water-cooled not, and water cooling plant is not set in it.
In the drilling/rolling method of the difficult distortion of above-mentioned high alloy seamless steel pipe, preferred: when said post bake, the two ends shutoff of hollow billet has exotic material.
Technique effect based on the utility model:
Through adopting drilling/rolling equipment and drilling/rolling method, successfully realized rolling high-alloy seamless steel pipe based on the difficult distortion of the high alloy seamless steel pipe of the utility model; And head lifetime is greatly improved, and each molybdenum base top on average can rolling 30 steel pipes; The steel pipe internal-surface quality has obtained effective control, and on-the-spot percent defective reduces greatly.
Description of drawings
Fig. 1 is the difficult formation sketch map that is out of shape the drilling/rolling equipment of seamless steel pipe of the high alloy of the utility model.
Fig. 2 is the difficult process schematic representation that is out of shape the drilling/rolling method of seamless steel pipe of the high alloy of the utility model.
Fig. 3 is the structural representation of the used molybdenum base top of utility model.
Fig. 4 is the structural representation of the used water cooled steel top of the utility model.
Reference numeral:
10 heating of pipe blank stoves; 20 punches; 30 pipe mills; 50 conveying equipments;
300 molybdenum bases top; 310 top heads; 320 top afterbodys; 340 internal threads;
400 water cooled steel top; 410 top heads; 420 top afterbodys; 440 internal threads.
The specific embodiment
Through following embodiment the utility model is carried out concrete description, particularly point out embodiment and be, can not be interpreted as restriction the protection domain of the utility model to the further specifying of the utility model.
Mainly comprise based on the difficult drilling/rolling equipment that is out of shape seamless steel pipe of the high alloy of the utility model: heating of pipe blank stove 10, punch 20 (having molybdenum base top 300 and water cooled steel top 400), pipe mill 30; Its equipment formation sketch map is as shown in Figure 1, and (punch among Fig. 1 is example with the two-roll piercer; Can certainly adopt three-roll piercer; Specifically look actual conditions and decide; In addition, arrow is represented the trend of rolled piece among the figure, and what this place's conveying represented in " hollow billet " two words is the hollow billet behind the once perforated).Technological process based on the drilling/rolling equipment of the difficult distortion of the high alloy of the utility model seamless steel pipe is following: the heating → secondary punch → tube rolling of heating of pipe blank → once perforated → again, and as shown in Figure 2.
Wherein the effect of heating of pipe blank is that this heating process can be accomplished in rotary heating furnace, but is not limited thereto with the temperature of heating of pipe blank to suitable distortion, also can in other are used for the heating furnace of pipe, accomplish.The effect of punch is that solid pipe is worn into hollow hollow billet, and the effect of pipe mill is hollow hollow billet to be subtracted wall extend (in fact after rolling, also will advise circle to steel pipe through slight stretch sizing mill).
Details are as follows to combine the drilling/rolling technology of the difficult distortion of 1, the 2 pairs of high alloys of accompanying drawing seamless steel pipe now:
At first; Utilize annular furnace to heat pipe; Reach the predetermined heating temperature and after insulation a period of time after the whole temperature that reaches suitable perforation distortion (step S11) at pipe, utilize out furnace apparatus pipe is come out of the stove and to utilize conveying equipment 50 (such as rollgang) to be transported to the once perforated machine and bore a hole, pipe is bored a hole into heavy wall hollow ingot (S12); Then, carry winding shape heating furnace to carry out post bake (S13) with conveying equipment again.
When utilizing punch to carry out once perforated, the top that punch adopted is molybdenum base top, is a kind of molybdenum base top without water-cooled, and the top case hardness is high, wear-resisting.Its composition: Ti:1.0~2.0wt%, Zr:0.1~0.5wt%, C:0.1~0.5wt%, all the other are molybdenum.Its shape and structure is as shown in Figure 3, and this top 300 comprises top head 310 and the top afterbody that is connected push rod (not shown) 320 compositions, is formed with internal thread 340 in the inside that comes directly towards afterbody, be connected push rod on external thread spiro fastening.Before perforation, glass dust is evenly coated in the surface, top, the one, lubricate, the 2nd, guarantee the hollow billet inner surface quality.
After utilizing punch to accomplish once perforated; The two ends of the hollow billet that obtains are carried out being delivered into after the shutoff with exotic material again carry out post bake in the rotary heating furnace; Adopting exotic material shutoff hollow billet two ends is by secondary oxidation, to guarantee the steel pipe internal-surface quality for fear of hollow billet.
Compare with the piercing process that once adds once perforated,, increased some energy consumptions though steel pipe has heated twice, because the two ends of hollow billet of having adopted the exotic material shutoff, so reduced the scaling loss and the oxidation of steel pipe.Compare with the piercing process that once adds twice bore a hole continuously (with two punches),, avoided investing the shortcoming of big operating cost owing to only need a punch.
Reach the temperature of suitable distortion in the hollow billet post bake after, hollow billet is come out of the stove, utilize conveying equipment to be transported to punch and carry out secondary punch (S14).In the perforation procedure, adopted the top different with once perforated, what this time perforation was adopted is traditional water-cooled top, and the top case hardness is low, not wear-resisting, and the top is prone to split.
The composition (percetage by weight wt%) of this water-cooled top is as follows: C:0.19~0.23, Si:0.90~1.10, Mn:0.70~0.90, Cr:1.40~1.80; Ni:2.30~2.50, Mo:0.30~0.40, W:1.60~1.70; S :≤0.025, P≤0.025, all the other are Fe.
The shape and structure of this top is as shown in Figure 3, and this top 400 comprises top head 410, connects the top afterbody 420 of push rod (not shown), and the inside of afterbody is formed with internal thread 440 in the top, be connected push rod on external thread spiro fastening.The inner utilization of top pierces into the tubule that comes from the push rod afterbody and introduces cooling water, in coming directly towards, shows to cool off.
Changing the water-cooled top into by molybdenum base top is (S14) that when the hollow billet behind the once perforated is heated once more, carries out, and says from the angle of operating efficiency, and changing the top can not have materially affect to production efficiency.
Carry out subtracting the tube-rolling technique (S15) that wall extends before hollow billet behind the secondary punch is transported to pipe mill.As diagonal rolling pipe mill, dual roll type and three-roller type are arranged, three-roller type has A Saier (Assel) and two kinds of types of special Lanace Wa Er (Transval), and we are A Saier roller trio skew rolling pipe machines this use.
Produce the method for steel pipe compares with traditional use diagonal rolling pipe mill unit; Traditional diagonal rolling pipe mill adopts once perforated technology; And based on the difficult distortion of the high alloy of the utility model seamless steel tube production process using the technology of double piercing (top of unlike material) and twice heating, its benefit analysis is following.
Adopt the analysis of causes of double piercing: we know that when becoming hollow billet by pipe, the alloy content in the pipe is high more; Resistance of deformation during perforation bigger (even identical deflection), and if utilize and to wear the once perforated technology that hole just reaches the regulation deflection, deflection is big during because of once perforated; Resistance of deformation increases thereupon, not only come directly towards fragile but also be easy to generate defectives such as interior pipe, implosion at the interior table of hollow billet, and because the aperture time long; The top is heated and is prone to deform; Also can bring influence, so comprehensive these factors have adopted the technology of double piercing to the hollow billet inner surface quality.
The characteristics of double piercing: said as last content; When boring a hole for the first time; Utilize punch to come directly towards with the molybdenum base pipe is bored a hole into the heavy wall hollow ingot, utilize punch and water cooled steel top to carry out secondary punch after the heating again, the deflection of the required completion of boring a hole so each time is minimized; The corresponding minimizing of resistance of deformation of perforation has reduced the required power of punch thus each time.
In a word, through adopting double piercing technology, reduced the aperture time of perforation each time, reduced the punching press when boring a hole each time, reduction ratio before the top that has reduced to bore a hole each time prevents that inner surface from producing defectives such as scratch, interior pipe.
Because the technology that no longer adopts once perforated to put in place; But being divided into double piercing, reduction ratio, perforation resistance of deformation all are minimized before the top of perforation each time, so the degree of wear that the molybdenum base is come directly towards during once perforated significantly reduces; Prolonged the life-span of molybdenum base top; Reduced and adopted molybdenum base top to carry out the cost of tube rolling, according to the reality test, each molybdenum base top on average can rolling 30 steel pipes.Changed the viewpoint of thinking that in the past molybdenum base head lifetime is short, production efficiency is low.
Use molybdenum base top during through once perforated, adopt the steel top during secondary punch, both improved head lifetime, effectively reduce the expense of molybdenum base top again, and improved the product inner surface quality greatly, make on-the-spot percent defective reduce greatly.

Claims (4)

1. the drilling/rolling equipment of the difficult distortion of high alloy seamless steel pipe is characterized in that this drilling/rolling equipment comprises:
Heating furnace heats the hollow billet behind pipe and the once perforated;
Punch carries out once perforated or the hollow billet behind the once perforated is carried out secondary punch the pipe after the heating; With
Pipe mill subtracts rolling that wall extends to the hollow billet behind the secondary punch,
Punch is equipped with two kinds of tops, is respectively water cooled steel top and molybdenum base top, when punch carries out once perforated, adopts molybdenum base top, adopts the water cooled steel top when carrying out secondary punch.
2. the drilling/rolling equipment of the difficult distortion of high alloy as claimed in claim 1 seamless steel pipe is characterized in that: said molybdenum base top comes directly towards for water-cooled not, and water cooling plant is not set in it.
3. the drilling/rolling equipment of the difficult distortion of high alloy as claimed in claim 1 seamless steel pipe is characterized in that:
The two ends shutoff of hollow billet had exotic material when the hollow billet behind the once perforated heated in heating furnace.
4. the drilling/rolling equipment of the difficult distortion of high alloy as claimed in claim 1 seamless steel pipe, it is characterized in that: said punch is two-roll piercer or three-roll piercer.
CN2012200112037U 2011-12-31 2012-01-12 Punching and rolling equipment of high-alloy difficultly deformable seamless steel pipe Active CN202438543U (en)

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Application Number Priority Date Filing Date Title
CN201110454698 2011-12-31
CN201120568042.7 2011-12-31
CN201110454698.0 2011-12-31
CN201120568042 2011-12-31
CN2012200112037U CN202438543U (en) 2011-12-31 2012-01-12 Punching and rolling equipment of high-alloy difficultly deformable seamless steel pipe

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102527722A (en) * 2011-12-31 2012-07-04 湖北新冶钢有限公司 Perforating and rolling equipment and method of high-alloy and hard-deformation seamless steel tube

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CN103286157B (en) * 2013-06-08 2015-06-03 新兴铸管股份有限公司 Hot rolling method of metallurgical bonding wear-resistant composite tube
CN103934269B (en) * 2014-03-31 2016-06-08 攀钢集团成都钢钒有限公司 A kind of TC4 titanium alloy seamless tube and production method thereof
CN105234463A (en) * 2015-11-19 2016-01-13 扬州诚德钢管有限公司 Deep hole boring process of cross-pierced tube blanks of high-alloy large-diameter seamless steel tubes
CN110616364B (en) * 2018-06-20 2021-08-13 宝山钢铁股份有限公司 Economical seamless steel pipe top with long piercing life and manufacturing method thereof
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CN202438543U (en) * 2011-12-31 2012-09-19 湖北新冶钢有限公司 Punching and rolling equipment of high-alloy difficultly deformable seamless steel pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102527722A (en) * 2011-12-31 2012-07-04 湖北新冶钢有限公司 Perforating and rolling equipment and method of high-alloy and hard-deformation seamless steel tube
CN102527722B (en) * 2011-12-31 2014-09-03 湖北新冶钢有限公司 Perforating and rolling equipment and method of high-alloy and hard-deformation seamless steel tube

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TR01 Transfer of patent right

Effective date of registration: 20200628

Address after: 435001 Huangshi Road, Hubei, Huangshi, No. 316

Patentee after: Daye Special Steel Co.,Ltd.

Address before: 435001 Huangshi Road, Hubei, Huangshi, No. 316

Patentee before: HUBEI XINYEGANG STEEL Co.,Ltd.