CN102284486A - Process for manufacturing seamless steel tubes by hot rolling - Google Patents

Process for manufacturing seamless steel tubes by hot rolling Download PDF

Info

Publication number
CN102284486A
CN102284486A CN2011102444709A CN201110244470A CN102284486A CN 102284486 A CN102284486 A CN 102284486A CN 2011102444709 A CN2011102444709 A CN 2011102444709A CN 201110244470 A CN201110244470 A CN 201110244470A CN 102284486 A CN102284486 A CN 102284486A
Authority
CN
China
Prior art keywords
machine
pipe
seamless steel
heating
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011102444709A
Other languages
Chinese (zh)
Inventor
张明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuxi Huaye Iron & Steel Co Ltd
Original Assignee
Wuxi Huaye Iron & Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuxi Huaye Iron & Steel Co Ltd filed Critical Wuxi Huaye Iron & Steel Co Ltd
Priority to CN2011102444709A priority Critical patent/CN102284486A/en
Publication of CN102284486A publication Critical patent/CN102284486A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a process for manufacturing seamless steel tubes by hot rolling, comprising the following steps of: (1) heating tube blanks; (2) punching; (3) tandem rolling; (4) concentrating the punched tubular billets in a heating furnace after the tandem rolling is carried out and then heating; (5) mounting a tube knockout machine with five machine racks in back of a tandem rolling machine set with eight machine racks to knock out pierced billets after being tandem rolled for eight times from a mandril and start a next procedure which is a 20-machine-rack tension reducing procedure; (6) configuring a tension reducing machine rack with 20 machine racks and three rollers; introducing the knocked-out pierced billets into the tension reducing machine rack with the 20 machine racks and the three rollers to roll so that the heat finished product steel tubes are obtained; (7) forming the finished product steel tubes after finishing the heat finished product steel tubes. Production efficiency and finished product quality are notably improved by further searching and improving the process for manufacturing the seamless steel tubes by hot rolling, thereby generating more and better steel tubes per unit time and improving economic benefit of enterprises.

Description

A kind of hot rolled seamless steel tube manufacturing process
Technical field
The present invention relates to the hot rolled seamless steel tube manufacturing process, belong to metal rolled technical field.
Background technology
Existing hot rolled seamless steel tube production process is solid pipe (or steel ingot) is bored a hole and to be rolled into the steel pipe of reservation shape, size and performance; Whole process mainly contains three distortion operations: (1) perforation-solid pipe (steel ingot) pierced billet is become hollow hollow forging; (2) tube rolling-with the wall thickness of hollow forging rolls into preliminary dimension or near the hollow billet of preliminary dimension; (3) decide the tube reducing-external diameter of hollow billet the is rolled into hot production tube of preliminary dimension.
Deciding the tube reducing operation and need dispose a large amount of standby frames in the hot rolled seamless steel tube production technology forming the pass schedule of different standby series, thereby satisfies the hollow billet distortion of rolling back different size, and final production goes out the finished product seamless steel pipe of different size group distance; When the roll stand of size-reducing mill more for a long time, then need more standby frame.Therefore, generally speaking, size-reducing mill and standby frame are the maximum operations of investment in the whole piece seamless steel tube production chain.
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.
Therefore, the maximum single processing apparatus of investment in the hot rolled seamless steel tube production technology, i.e. size-reducing mill, actual production usefulness can only have been given play to the effect less than its half capacity of equipment.
Summary of the invention
At the deficiencies in the prior art, one of purpose of the present invention is to provide a kind of hot rolled seamless steel tube manufacturing process.
For achieving the above object, the present invention adopts following technical scheme:
A kind of hot rolled seamless steel tube manufacturing process, pipe composition quality percentage is: C 0.25~0.35%, Si 0.1~0.5%, Ni 5.0-8.5%, Zr 3.5-4.8%, Mn 1.0~2.0%, V 0.05~0.25%, N 0.015~0.030%, Fe surplus and inevitable impurity;
Described manufacturing process is:
(1) pipe is heated in heating furnace;
(2) two punches being set bores a hole to the pipe after heating;
(3) 8 frame tandem rolling tube machines are set behind punch, the hollow billet after the perforation is through on the retained mandrel in advance, extend rolling continuously to the hollow billet after boring a hole by 8 frames of continuous layout and the wrong mutually retained mandrel tandem rolling tube machine of roll gap of adjacent breast roller;
(4) hollow billet behind the drilling/rolling is concentrated in the reheating furnace heats again;
(5) behind 8 frame tandem rolling units, 5 frame winding arbor extraction presses are set, the hollow forging behind 8 tandem rollings is deviate to enter next operation-20 frame stretch reducing operation from plug;
(6) configuration 20 frame three-roller tension reducing mill framves after 5 frame winding arbor extraction press groups take off hollow forging behind the pipe and enter 20 frame three-roller tension reducing mill framves and be rolled, and form hot fished pipe; Sizing reduction can reach 35%~42%, and wall thickness reducing amount can reach 18%~24%, and lengthening coefficient can reach 4.3~5.1, and muzzle velocity can reach 13m/s;
(7) will form fished pipe after the hot fished pipe finishing.
Refinement more: in the described step (1), with heating of pipe blank to 1290~1400 ℃.
Step (1), (4) described heating furnace or reheating furnace comprise inclined-bottom heating furnace, step heating-furnace, rotary heating furnace, tunnel heating furnace, induction heating furnace.
Described heating, its temperature range are 1100~1350 ℃.
Described punch is that vertical cone mill, cone-type piercer machine, Di are given up youngster's punch, pushing piercing machine or press piercing mill.
Described pipe mill is MPM tandem rolling tube machine, PQF three-roller tandem rolling tube machine, roller trio skew rolling pipe machine or push-bench, and wherein hot-rolled temperature is 750-900 ℃.
Described step finishing comprise blow ash, aligning, excision burr tail, hand inspection, defect detecting test, the water pressure test, spray printing sign, corrosion-inhibiting coating, measure each operation or wherein any practical need the combination operation of operation.
The specific embodiment
In order to make those skilled in the art person understand the present invention program better, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below embodiment be that the present invention is further detailed explanation:
Embodiment one
A kind of hot rolled seamless steel tube manufacturing process, pipe composition quality percentage is: C 0.35%, Si 0.5%, Ni 8.5%, Zr 4.8%, Mn 2.0%, V 0.25%, N 0.030%, Fe surplus and inevitable impurity;
Described manufacturing process is:
(1) pipe is heated in heating furnace;
(2) two punches being set bores a hole to the pipe after heating;
(3) 8 frame tandem rolling tube machines are set behind punch, the hollow billet after the perforation is through on the retained mandrel in advance, extend rolling continuously to the hollow billet after boring a hole by 8 frames of continuous layout and the wrong mutually retained mandrel tandem rolling tube machine of roll gap of adjacent breast roller;
(4) hollow billet behind the drilling/rolling is concentrated in the reheating furnace heats again;
(5) behind 8 frame tandem rolling units, 5 frame winding arbor extraction presses are set, the hollow forging behind 8 tandem rollings is deviate to enter next operation-20 frame stretch reducing operation from plug;
(6) configuration 20 frame three-roller tension reducing mill framves after 5 frame winding arbor extraction press groups take off hollow forging behind the pipe and enter 20 frame three-roller tension reducing mill framves and be rolled, and form hot fished pipe; Sizing reduction can reach 35%~42%, and wall thickness reducing amount can reach 18%~24%, and lengthening coefficient can reach 4.3~5.1, and muzzle velocity can reach 13m/s;
(7) will form fished pipe after the hot fished pipe finishing.
Refinement more: in the described step (1), with heating of pipe blank to 1400 ℃.
Step (1), (4) described heating furnace or reheating furnace comprise inclined-bottom heating furnace, step heating-furnace, rotary heating furnace, tunnel heating furnace, induction heating furnace.
Described heating, its temperature range are 1350 ℃.
Described punch is that vertical cone mill, cone-type piercer machine, Di are given up youngster's punch, pushing piercing machine or press piercing mill.
Described pipe mill is MPM tandem rolling tube machine, PQF three-roller tandem rolling tube machine, roller trio skew rolling pipe machine or push-bench, and wherein hot-rolled temperature is 900 ℃.
Described step finishing comprise blow ash, aligning, excision burr tail, hand inspection, defect detecting test, the water pressure test, spray printing sign, corrosion-inhibiting coating, measure each operation or wherein any practical need the combination operation of operation.
Embodiment two
A kind of hot rolled seamless steel tube manufacturing process, pipe composition quality percentage is: C 0.25%, Si 0.1%, Ni 5.0%, Zr 3.5%, Mn 1.0%, V 0.05%, N 0.015%, Fe surplus and inevitable impurity;
Described manufacturing process is:
(1) pipe is heated in heating furnace;
(2) two punches being set bores a hole to the pipe after heating;
(3) 8 frame tandem rolling tube machines are set behind punch, the hollow billet after the perforation is through on the retained mandrel in advance, extend rolling continuously to the hollow billet after boring a hole by 8 frames of continuous layout and the wrong mutually retained mandrel tandem rolling tube machine of roll gap of adjacent breast roller;
(4) hollow billet behind the drilling/rolling is concentrated in the reheating furnace heats again;
(5) behind 8 frame tandem rolling units, 5 frame winding arbor extraction presses are set, the hollow forging behind 8 tandem rollings is deviate to enter next operation-20 frame stretch reducing operation from plug;
(6) configuration 20 frame three-roller tension reducing mill framves after 5 frame winding arbor extraction press groups take off hollow forging behind the pipe and enter 20 frame three-roller tension reducing mill framves and be rolled, and form hot fished pipe; Sizing reduction can reach 35%%, and wall thickness reducing amount can reach 18%%, and lengthening coefficient can reach 4.3, and muzzle velocity can reach 13m/s;
(7) will form fished pipe after the hot fished pipe finishing.
Refinement more: in the described step (1), with heating of pipe blank to 1290 ℃.
Step (1), (4) described heating furnace or reheating furnace comprise inclined-bottom heating furnace, step heating-furnace, rotary heating furnace, tunnel heating furnace, induction heating furnace.
Described heating, its temperature range are 1100 ℃.
Described punch is that vertical cone mill, cone-type piercer machine, Di are given up youngster's punch, pushing piercing machine or press piercing mill.
Described pipe mill is MPM tandem rolling tube machine, PQF three-roller tandem rolling tube machine, roller trio skew rolling pipe machine or push-bench, and wherein hot-rolled temperature is 750 ℃.
Described step finishing comprise blow ash, aligning, excision burr tail, hand inspection, defect detecting test, the water pressure test, spray printing sign, corrosion-inhibiting coating, measure each operation or wherein any practical need the combination operation of operation.
Applicant's statement, the present invention illustrates detailed process equipment of the present invention and technological process by the foregoing description, but the present invention is not limited to above-mentioned detailed process equipment and technological process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technological process could be implemented.The person of ordinary skill in the field should understand, any improvement in the present invention to the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.

Claims (7)

1. hot rolled seamless steel tube manufacturing process, it is characterized in that: pipe composition quality percentage is: C 0.25~0.35%, Si 0.1~0.5%, Ni 5.0-8.5%, Zr 3.5-4.8%, Mn 1.0~2.0%, V 0.05~0.25%, N 0.015~0.030%, Fe surplus and inevitable impurity;
Described manufacturing process is:
(1) pipe is heated in heating furnace;
(2) two punches being set bores a hole to the pipe after heating;
(3) 8 frame tandem rolling tube machines are set behind punch, the hollow billet after the perforation is through on the retained mandrel in advance, extend rolling continuously to the hollow billet after boring a hole by 8 frames of continuous layout and the wrong mutually retained mandrel tandem rolling tube machine of roll gap of adjacent breast roller;
(4) hollow billet behind the drilling/rolling is concentrated in the reheating furnace heats again;
(5) behind 8 frame tandem rolling units, 5 frame winding arbor extraction presses are set, the hollow forging behind 8 tandem rollings is deviate to enter next operation-20 frame stretch reducing operation from plug;
(6) configuration 20 frame three-roller tension reducing mill framves after 5 frame winding arbor extraction press groups take off hollow forging behind the pipe and enter 20 frame three-roller tension reducing mill framves and be rolled, and form hot fished pipe; Sizing reduction can reach 35%~42%, and wall thickness reducing amount can reach 18%~24%, and lengthening coefficient can reach 4.3~5.1, and muzzle velocity can reach 13m/s;
(7) will form fished pipe after the hot fished pipe finishing.
2. hot rolled seamless steel tube manufacturing process according to claim 1 is characterized in that, in the described step (1), with heating of pipe blank to 1290~1400 ℃.
3. hot rolled seamless steel tube manufacturing process according to claim 1 and 2, it is characterized in that step (1), (4) described heating furnace or reheating furnace comprise inclined-bottom heating furnace, step heating-furnace, rotary heating furnace, tunnel heating furnace, induction heating furnace.
4. hot rolled seamless steel tube manufacturing process according to claim 3 is characterized in that, described heating, and its temperature range is 1100~1350 ℃.
5. hot rolled seamless steel tube manufacturing process according to claim 1 is characterized in that, described punch is that vertical cone mill, cone-type piercer machine, Di are given up youngster's punch, pushing piercing machine or press piercing mill.
6. hot rolled seamless steel tube manufacturing process according to claim 1 is characterized in that described pipe mill is MPM tandem rolling tube machine, PQF three-roller tandem rolling tube machine, roller trio skew rolling pipe machine or push-bench, and wherein hot-rolled temperature is 750-900 ℃.
7. hot rolled seamless steel tube manufacturing process according to claim 1, it is characterized in that, described step finishing comprise blow ash, aligning, excision burr tail, hand inspection, defect detecting test, the water pressure test, spray printing sign, corrosion-inhibiting coating, measure each operation or wherein any practical need the combination operation of operation.
CN2011102444709A 2011-08-24 2011-08-24 Process for manufacturing seamless steel tubes by hot rolling Pending CN102284486A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011102444709A CN102284486A (en) 2011-08-24 2011-08-24 Process for manufacturing seamless steel tubes by hot rolling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011102444709A CN102284486A (en) 2011-08-24 2011-08-24 Process for manufacturing seamless steel tubes by hot rolling

Publications (1)

Publication Number Publication Date
CN102284486A true CN102284486A (en) 2011-12-21

Family

ID=45331392

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011102444709A Pending CN102284486A (en) 2011-08-24 2011-08-24 Process for manufacturing seamless steel tubes by hot rolling

Country Status (1)

Country Link
CN (1) CN102284486A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102581014A (en) * 2012-02-07 2012-07-18 王国亮 Process for producing thin-wall seamless steel tubes
CN102632078A (en) * 2012-05-03 2012-08-15 无锡西姆莱斯石油专用管制造有限公司 Production method of J55 steel-grade oil casing capable of resisting impact load
CN102974615A (en) * 2012-11-08 2013-03-20 聊城市开发区全运钢管制造有限公司 Rolling process method of punched lining core of steel rod
CN106216400A (en) * 2016-08-03 2016-12-14 太原磬泓机电设备有限公司 The external diameter roll seamless steel tube Processes and apparatus installation system more than 60mm
CN110340147A (en) * 2019-07-12 2019-10-18 林州凤宝管业有限公司 A kind of outer small-caliber seamless steel pipe production method through being less than 60mm
CN111282997A (en) * 2020-02-17 2020-06-16 包头钢铁(集团)有限责任公司 Heat-resistant seamless steel tube 12Cr1MoVG hot continuous rolling production method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102581014A (en) * 2012-02-07 2012-07-18 王国亮 Process for producing thin-wall seamless steel tubes
CN102632078A (en) * 2012-05-03 2012-08-15 无锡西姆莱斯石油专用管制造有限公司 Production method of J55 steel-grade oil casing capable of resisting impact load
CN102974615A (en) * 2012-11-08 2013-03-20 聊城市开发区全运钢管制造有限公司 Rolling process method of punched lining core of steel rod
CN106216400A (en) * 2016-08-03 2016-12-14 太原磬泓机电设备有限公司 The external diameter roll seamless steel tube Processes and apparatus installation system more than 60mm
CN110340147A (en) * 2019-07-12 2019-10-18 林州凤宝管业有限公司 A kind of outer small-caliber seamless steel pipe production method through being less than 60mm
CN111282997A (en) * 2020-02-17 2020-06-16 包头钢铁(集团)有限责任公司 Heat-resistant seamless steel tube 12Cr1MoVG hot continuous rolling production method

Similar Documents

Publication Publication Date Title
CN101327492A (en) Process and system for manufacturing hot-rolled seamless tube
CN102284486A (en) Process for manufacturing seamless steel tubes by hot rolling
CN101020190A (en) Hot rolling process of seamless steel pipe
CN103128102B (en) Production method of titanium alloy oil well pipe
CN103272845B (en) Hot rolling process of small-bore ultra-thin-wall seamless steel tube
CN101337236A (en) Rolling mill technique of three-roller full-floating core rod tandem rolling tube
CN102039313A (en) Method for producing large-diameter seamless steel pipe for gas cylinder
CN104874606A (en) Production method of high-chromium ferrite stainless steel seamless pipe
CN101020191A (en) Hot rolling process of seamless steel pipe
CN101954377A (en) Full-floating mandrel tandem-rolling seamless steel pipe production process
CN101972776A (en) Hot rolling production process of automatic tube rolling mill
CN101767106B (en) Hot rolling process of stainless plate strip coil
CN101020192A (en) Hot rolling process of seamless steel pipe
CN105234200A (en) On-line tube-expanding production process of large-diameter seamless steel tubes
CN201253641Y (en) Hot rolled seamless steel tube manufacturing system
CN102009069A (en) Manufacturing process of small-caliber hot rolling seamless steel tubes
CN102228905A (en) Production process of hot continuous rolling seamless steel tube with small caliber
CN102581014A (en) Process for producing thin-wall seamless steel tubes
CN103624088A (en) Method for eliminating transverse cracks on steel plate tail
CN102107213A (en) Production process of petroleum pipe
CN105478478A (en) Process for forming large-diameter seamless thick-wall and extra-strong steel pipes
CN107737810A (en) Steel pipe rolling technique
CN102513360A (en) Seamless steel tube hot rolling manufacture process
CN101722190B (en) Process for treating hot-rolled capillary pipe
CN101920263B (en) Method for producing medium and small aperture seamless steel tube by reducing and rolling hollow continuous cast tube blank

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20111221

C02 Deemed withdrawal of patent application after publication (patent law 2001)