CN101327492A - Process and system for manufacturing hot-rolled seamless tube - Google Patents

Process and system for manufacturing hot-rolled seamless tube Download PDF

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Publication number
CN101327492A
CN101327492A CNA2008101350933A CN200810135093A CN101327492A CN 101327492 A CN101327492 A CN 101327492A CN A2008101350933 A CNA2008101350933 A CN A2008101350933A CN 200810135093 A CN200810135093 A CN 200810135093A CN 101327492 A CN101327492 A CN 101327492A
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pipe
mill
rolling
reducing
heating
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CNA2008101350933A
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Chinese (zh)
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邱永泰
郝建庚
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郝建庚
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Priority to CNA2008101350933A priority Critical patent/CN101327492A/en
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Abstract

The invention discloses a manufacturing process and system of a hot-rolled seamless steel pipe, which solves the problem with the prior hot-rolled seamless steel pipe production process that the investment into a reducing sizing mill is large while the utilization rate is low. The manufacturing process includes the following steps: heating, wherein, the tube blanks are heated in the mill furnace; perforation and pipe rolling, wherein, two punches and two tube mills or two sets of punches and tube mills are provided for perforation and rolling of the tube blanks; reheating, wherein, the perforated and rolled hollow billets are heated in a reheating mill furnace; sizing reducing, wherein, the reheated hollow billets are rolled in the reducing sizing mill to produce hot finished steel pipes; finishing, wherein, finish the hot finished steel pipes to produce finished steel pipes. The invention is applicable to the production of hot-rolled seamless steel pipes.

Description

Hot rolled seamless steel tube manufacturing process and system
Technical field
The present invention relates to a kind of hot rolled seamless steel tube manufacturing process and system, 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.
The tube reducing operation of deciding in the hot rolled seamless steel tube production technology is finally to determine the rolling deformation operation of outer diameter of steel pipes, when arts demand, can be equipped with the above reducing mill (12 to call mini-stretch reducing mill in the following text) of 8 frames, the stretch reducing technology of 28 frames can realize that (maximum total reducing rate is to decide one of most important technical parameter of tube reducing operation for 90% maximum total reducing rate, generally represent with Greek alphabet ε, if maximum outer diameter of steel pipes is D before the tube reducing, minimum outer diameter of steel pipes is d behind the tube reducing, then: ε=(D-d)/D * 100%), the single chassis reducing rate of its three-roller type frame can reach about 4%.Therefore, during the reducing mill of this operation more than configuration three-roller type 8 frames, can in the steel pipe sizing, realize the rolling of sizing reduction greatly.
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.
Generally, when by perforation, the tube rolling of aforementioned definitions, when deciding that any one equipment is formed a production line in three operations of tube reducing, because size-reducing mill does not have rolling off time and mill speed is adjustable, its production capacity has affluence amount over half usually.
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
The purpose of this invention is to provide the high hot rolled seamless steel tube manufacturing process of a kind of production capacity.
For achieving the above object, the present invention adopts following technical scheme:
Hot rolled seamless steel tube manufacturing process provided by the invention comprises the steps:
Heating is heated pipe in heating furnace;
Perforation and tube rolling are provided with two punches, two pipe mills or two cover punches and the pipe mill pipe after to heating and carry out drilling/rolling;
Heat again the hollow billet behind the drilling/rolling is heated in reheating furnace again;
The hollow billet of deciding after tube reducing will heat again is rolled in size-reducing mill, forms hot fished pipe;
Finishing forms fished pipe after with hot fished pipe finishing.
Further, described step adds pines for, with heating of pipe blank to 1100~1280 ℃.
Wherein, described heating furnace is Sloping Hearth Heating Furnace, rotary heating furnace, walking beam furnace, dovetail type heating furnace or induction heating furnace.
In perforation of described step and the tube rolling, utilize punch that pipe is bored a hole, described punch is that graceful formula punch, cone-type piercer machine, Di are given up youngster's punch, pushing piercing machine or press piercing mill.
In described step perforation and the tube rolling, utilize pipe mill that pipe is rolled, described pipe mill is automatic tube rolling mill, two-roller skew-rolling pipe machine, roller trio skew rolling pipe machine or push-bench.
It is 835~1280 ℃ that described step adds the heating-up temperature scope of pining for again, and reheating furnace is Sloping Hearth reheating furnace, step-by-step movement reheating furnace, tunnel type reheating furnace or induction reheating furnace.
Described size-reducing mill comprises sizing mill, common reducing mill, mini-stretch reducing mill and stretch-reducing mill.
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.
Another object of the present invention provides the high hot rolled seamless steel tube manufacturing system of a kind of production capacity.
For achieving the above object, the present invention adopts following technical scheme:
Hot rolled seamless steel tube manufacturing system provided by the invention comprises:
Heating furnace is used to heat pipe;
Punch and pipe mill are provided with two punches, two pipe mills or two cover punches and pipe mill is used for the pipe after the heating is carried out drilling/rolling;
Reheating furnace is used for concentrating the hollow billet heat again behind the drilling/rolling;
Size-reducing mill is used for the hollow billet after heating is again carried out deciding reducing and rolling, forms hot fished pipe.
Hot rolled seamless steel tube manufacturing process provided by the invention and system, by having a punch in the hot rolled seamless steel tube production technology now, a pipe mill or a cover perforation and pipe mill mate with a reducing sizing mill, change into two punches, two pipe mills or two cover perforation and pipe mill and a reducing sizing mill are complementary, make by perforation, two production lines that tube rolling or perforation tube rolling operation are formed provide hollow billet for a size-reducing mill, thereby make size-reducing mill in whole production technology, bring into play capacity of equipment fully, on the one hand, the production efficiency of whole hot rolled seamless steel tube production technology is improved nearly one times, on the other hand, given full play to the capacity of equipment of size-reducing mill, improve the rate of return on investment of size-reducing mill, also improved the rate of return on investment of whole hot rolled seamless steel tube production technology.
Description of drawings
Fig. 1 is the flow chart of the preferred embodiment of hot rolled seamless steel tube manufacturing process of the present invention;
Fig. 2 is the flow chart of the specific embodiment 1 of hot rolled seamless steel tube manufacturing process of the present invention;
Fig. 3 is the flow chart of the specific embodiment 2 of hot rolled seamless steel tube manufacturing process of the present invention;
Fig. 4 is the flow chart of the specific embodiment 3 of hot rolled seamless steel tube manufacturing process of the present invention;
Fig. 5 is the structural representation of the preferred embodiment of hot rolled seamless steel tube manufacturing system of the present invention.
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, the present invention is further detailed explanation below in conjunction with drawings and Examples.
As shown in Figure 1, hot rolled seamless steel tube manufacturing process provided by the invention comprises the steps:
The S101 heating is heated pipe in heating furnace;
Described heating furnace can be selected Sloping Hearth Heating Furnace, rotary heating furnace, walking beam furnace, dovetail type heating furnace or induction heating furnace for use, and the heating-up temperature scope is 1100~1280 ℃.
S102 perforation and tube rolling are provided with two punches, two pipe mills or two cover punches and the pipe mill pipe after to heating and carry out drilling/rolling;
In perforation process and tube rolling operation, two identical punches, pipe mill or the identical perforation pipe mill of two covers are set, form two production lines, improve the quantity that pipe drilling/rolling in the unit interval becomes hollow billet.
Described punch can select for use graceful formula punch, cone-type piercer machine, Di to give up youngster's punch, pushing piercing machine or press piercing mill.
Described pipe mill is automatic tube rolling mill, two-roller skew-rolling pipe machine, roller trio skew rolling pipe machine or push-bench.
S103 heats the hollow billet behind the drilling/rolling is concentrated in the reheating furnace again and heats, and the heating-up temperature scope is 835~1280 ℃.
Described reheating furnace can be selected Sloping Hearth reheating furnace, step-by-step movement reheating furnace, tunnel type reheating furnace or induction reheating furnace for use.
The hollow billet that S104 will decide after tube reducing will heat again is rolled in size-reducing mill, forms fished pipe;
Rolling described in this processing step, be that the total reducing rate by design carries out in the reducing pass system in definite deciding, and the reducing pass system that decides that determines requires to design according to production specification scope, production capacity, and the parameter of the equipment rack quantity in this processing step, inlet mill speed, frame and equipment is determined according to pass schedule.
Described size-reducing mill comprises sizing mill, common reducing mill, mini-stretch reducing mill and stretch-reducing mill.
The S105 finishing forms fished pipe after with hot fished pipe finishing.
Finishing procedure is to the cooled further processing of hot fished pipe, 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, finally obtain the commodity steel pipe.
Hot rolled seamless steel tube manufacturing process provided by the invention, by having a punch in the hot rolled seamless steel tube production technology now, a pipe mill or a cover perforation and pipe mill mate with a reducing sizing mill, change into two punches, two pipe mills or two cover perforation and pipe mill and a reducing sizing mill are complementary, make by perforation, two production lines that tube rolling or perforation tube rolling operation are formed provide hollow billet for a size-reducing mill, thereby make size-reducing mill in whole production technology, bring into play capacity of equipment fully, on the one hand, the production efficiency of whole hot rolled seamless steel tube production technology is improved nearly one times, on the other hand, given full play to the capacity of equipment of size-reducing mill, improve the rate of return on investment of size-reducing mill, also improved the rate of return on investment of whole hot rolled seamless steel tube production technology.
As shown in Figure 2, the embodiment 1 of hot rolled seamless steel tube manufacturing process provided by the invention comprises the steps:
The S201 heating is heated pipe in heating furnace;
The S202 perforation is provided with two punches the pipe after heating is bored a hole;
The hollow billet that S203 will decide after tube reducing will be bored a hole is rolled in size-reducing mill, forms hot fished pipe;
The S204 finishing forms fished pipe after with hot fished pipe finishing.
In the present embodiment, the pipe after the heating is without tube rolling, heating process again, and technological process is heating of pipe blank-perforation-Ding tube reducing-finishing.
As shown in Figure 3, the embodiment 2 of hot rolled seamless steel tube manufacturing process provided by the invention comprises the steps:
The S301 heating is heated pipe in heating furnace;
The S302 perforation is provided with two punches the pipe after heating is bored a hole;
S303 heats the hollow billet behind the drilling/rolling is heated in reheating furnace again;
The hollow billet that S304 will decide after tube reducing will be bored a hole is rolled in size-reducing mill, forms hot fished pipe;
The S305 finishing forms fished pipe after with hot fished pipe finishing.
In the present embodiment, the pipe after the heating is without the tube rolling operation, and technological process is heating of pipe blank-perforation-Ding tube reducing-heating-finishing again.
As shown in Figure 4, the embodiment 3 of hot rolled seamless steel tube manufacturing process provided by the invention comprises the steps:
The S401 heating is heated pipe in heating furnace;
S402 perforation and tube rolling are provided with two punches, two pipe mills or two cover punches and the pipe mill pipe after to heating and are rolled;
S403 decides that tube reducing will be bored a hole, the hollow billet behind the tube rolling is concentrated in the size-reducing mill and is rolled, and forms hot fished pipe;
The S404 finishing forms fished pipe after with hot fished pipe finishing.
In the present embodiment, the pipe after the heating is without heating process again, and technological process is heating of pipe blank-perforation-tube rolling-Ding tube reducing-finishing.
As shown in Figure 5, hot rolled seamless steel tube manufacturing system provided by the invention comprises:
Heating furnace 501 is used to heat pipe;
Described heating furnace can be selected Sloping Hearth Heating Furnace, rotary heating furnace, walking beam furnace, dovetail type heating furnace or induction heating furnace for use, and the heating-up temperature scope is 1100~1280 ℃.
Punch and pipe mill 502 are provided with two punches, two pipe mills or two cover punches and pipe mill is used for the pipe after the heating is carried out drilling/rolling;
In perforation process and tube rolling operation, two identical punches, pipe mill or the identical perforation pipe mill of two covers are set, form two production lines, improve the quantity that pipe drilling/rolling in the unit interval becomes hollow billet.
Described punch can select for use graceful formula punch, cone-type piercer machine, Di to give up youngster's punch, pushing piercing machine or press piercing mill.
Described pipe mill is automatic tube rolling mill, two-roller skew-rolling pipe machine, roller trio skew rolling pipe machine or push-bench.
Reheating furnace 503 is used for concentrating the hollow billet heat again behind the drilling/rolling;
Hollow billet behind the drilling/rolling is concentrated in the reheating furnace heats, the heating-up temperature scope is 835~1280 ℃.
Described reheating furnace can be selected Sloping Hearth reheating furnace, step-by-step movement reheating furnace, tunnel type reheating furnace or induction reheating furnace for use.
Size-reducing mill 504 is used for the hollow billet after heating is again carried out deciding reducing and rolling, forms hot fished pipe.
Rolling described in this processing step, be that the total reducing rate by design carries out in the reducing pass system in definite deciding, and the reducing pass system that decides that determines requires to design according to production specification scope, production capacity, and the parameter of the equipment rack quantity in this processing step, inlet mill speed, frame and equipment is determined according to pass schedule.
Described size-reducing mill comprises sizing mill, common reducing mill, mini-stretch reducing mill and stretch-reducing mill.
Hot rolled seamless steel tube manufacturing system provided by the invention, by having a punch in the hot rolled seamless steel tube production system now, a pipe mill or a cover perforation and pipe mill mate with a reducing sizing mill, change into two punches, two pipe mills or two cover perforation and pipe mill and a reducing sizing mill are complementary, make by perforation, two production lines that tube rolling or perforation tube rolling operation are formed provide hollow billet for a size-reducing mill, thereby make size-reducing mill in whole production system, bring into play complete capacity of equipment, on the one hand, the production efficiency of whole hot rolled seamless steel tube production system is improved nearly one times, on the other hand, given full play to the capacity of equipment of size-reducing mill, improve the rate of return on investment of size-reducing mill, also improved the rate of return on investment of whole hot rolled seamless steel tube production system.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.

Claims (9)

1, a kind of hot rolled seamless steel tube manufacturing process is characterized in that, comprises the steps:
Heating is heated pipe in heating furnace;
Perforation and tube rolling are provided with two punches, two pipe mills or two cover punches and the pipe mill pipe after to heating and carry out drilling/rolling;
Heat again the hollow billet behind the drilling/rolling is concentrated in the reheating furnace and heat again;
The hollow billet of deciding after tube reducing will heat again is rolled in size-reducing mill, forms hot fished pipe;
Finishing forms fished pipe after with hot fished pipe finishing.
2, hot rolled seamless steel tube manufacturing process according to claim 1 is characterized in that, described step adds pines for, with heating of pipe blank to 1100~1280 ℃.
3, hot rolled seamless steel tube manufacturing process according to claim 1 and 2 is characterized in that, described heating furnace is Sloping Hearth Heating Furnace, rotary heating furnace, walking beam furnace, dovetail type heating furnace or induction heating furnace.
4, hot rolled seamless steel tube manufacturing process according to claim 1, it is characterized in that, in perforation of described step and the tube rolling, utilize punch that pipe is bored a hole, described punch is that graceful formula punch, cone-type piercer machine, Di are given up youngster's punch, pushing piercing machine or press piercing mill.
5, hot rolled seamless steel tube manufacturing process according to claim 1, it is characterized in that, in described step perforation and the tube rolling, utilize pipe mill that pipe is rolled, described pipe mill is automatic tube rolling mill, two-roller skew-rolling pipe machine, roller trio skew rolling pipe machine or push-bench.
6, hot rolled seamless steel tube manufacturing process according to claim 1, it is characterized in that, it is 835~1280 ℃ that described step adds the heating-up temperature scope of pining for again, and reheating furnace is Sloping Hearth reheating furnace, step-by-step movement reheating furnace, tunnel type reheating furnace or induction reheating furnace.
7, hot rolled seamless steel tube manufacturing process according to claim 1 is characterized in that, described size-reducing mill comprises sizing mill, common reducing mill, mini-stretch reducing mill and stretch-reducing mill.
8, 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.
9, a kind of hot rolled seamless steel tube manufacturing system is characterized in that, comprising:
Heating furnace is used to heat pipe;
Punch and pipe mill are provided with two punches, two pipe mills or two cover punches and pipe mill is used for the pipe after the heating is carried out drilling/rolling;
Reheating furnace is used for concentrating the hollow billet heat again behind the drilling/rolling;
Size-reducing mill is used for the hollow billet after heating is again carried out deciding reducing and rolling, forms hot fished pipe.
CNA2008101350933A 2008-07-30 2008-07-30 Process and system for manufacturing hot-rolled seamless tube Pending CN101327492A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101954377A (en) * 2010-09-13 2011-01-26 胡顺珍 Full-floating mandrel tandem-rolling seamless steel pipe production process
CN102009069A (en) * 2010-09-13 2011-04-13 胡顺珍 Manufacturing process of small-caliber hot rolling seamless steel tubes
CN102319764A (en) * 2011-07-18 2012-01-18 新兴铸管股份有限公司 Method for manufacturing stainless steel seamless tube
CN102581014A (en) * 2012-02-07 2012-07-18 王国亮 Process for producing thin-wall seamless steel tubes
CN102802823A (en) * 2009-06-19 2012-11-28 斯姆丝因斯股份公司 Tube rolling plant
CN103073960A (en) * 2013-02-03 2013-05-01 张芝莲 Seamless pipe with anticorrosive layer
CN103073992A (en) * 2013-02-03 2013-05-01 张延� Production method for seamless pipe with anticorrosive layer
CN103934269A (en) * 2014-03-31 2014-07-23 攀钢集团成都钢钒有限公司 TC4 titanium alloy seamless tube and production method thereof
CN103949474A (en) * 2014-04-29 2014-07-30 攀钢集团成都钢钒有限公司 Skew rolling lubrication method for thin-walled austenitic stainless steel seamless steel tube
CN104399752A (en) * 2014-10-15 2015-03-11 攀钢集团成都钢钒有限公司 Seamless steel tube production method
CN104475451A (en) * 2014-12-11 2015-04-01 太原磬泓机电设备有限公司 Rolling system of seamless steel tube and rolling technology thereof
CN104826868A (en) * 2015-02-10 2015-08-12 长葛市一鸣机械有限公司 Small-diameter seamless steel pipe floating mandrel continuous mill unit and seamless steel pipe production process
CN104874606A (en) * 2015-06-16 2015-09-02 攀钢集团成都钢钒有限公司 Production method of high-chromium ferrite stainless steel seamless pipe
CN104907353A (en) * 2015-06-16 2015-09-16 攀钢集团成都钢钒有限公司 Production method of high-chromium ferrite stainless-steel seamless steel pipe blank
CN107363124A (en) * 2017-08-25 2017-11-21 攀钢集团研究院有限公司 The manufacture method of Aero-Space seamless steel pipe
CN107377662A (en) * 2016-04-01 2017-11-24 Sms集团股份有限公司 The manufacture method and system and centrifugally cast pipe and respective application of seamless hot-finished tube
CN109794510A (en) * 2019-03-28 2019-05-24 山东磐金钢管制造有限公司 A kind of production technology of seamless steel pipe
CN110404973A (en) * 2019-07-15 2019-11-05 扬州诚德钢管有限公司 A kind of manufacturing method for the seamless steel pipe that diameter is 760mm~914mm
CN110711779A (en) * 2019-10-26 2020-01-21 鑫鹏源智能装备集团有限公司 Control method for wall thickness of seamless steel tube

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102802823B (en) * 2009-06-19 2015-02-18 斯姆丝因斯股份公司 Tube rolling plant
CN102802823A (en) * 2009-06-19 2012-11-28 斯姆丝因斯股份公司 Tube rolling plant
CN101954377A (en) * 2010-09-13 2011-01-26 胡顺珍 Full-floating mandrel tandem-rolling seamless steel pipe production process
CN102009069A (en) * 2010-09-13 2011-04-13 胡顺珍 Manufacturing process of small-caliber hot rolling seamless steel tubes
CN102319764A (en) * 2011-07-18 2012-01-18 新兴铸管股份有限公司 Method for manufacturing stainless steel seamless tube
CN102581014A (en) * 2012-02-07 2012-07-18 王国亮 Process for producing thin-wall seamless steel tubes
CN103073960A (en) * 2013-02-03 2013-05-01 张芝莲 Seamless pipe with anticorrosive layer
CN103073992A (en) * 2013-02-03 2013-05-01 张延� Production method for seamless pipe with anticorrosive layer
CN103934269A (en) * 2014-03-31 2014-07-23 攀钢集团成都钢钒有限公司 TC4 titanium alloy seamless tube and production method thereof
CN103949474A (en) * 2014-04-29 2014-07-30 攀钢集团成都钢钒有限公司 Skew rolling lubrication method for thin-walled austenitic stainless steel seamless steel tube
CN104399752A (en) * 2014-10-15 2015-03-11 攀钢集团成都钢钒有限公司 Seamless steel tube production method
CN104475451A (en) * 2014-12-11 2015-04-01 太原磬泓机电设备有限公司 Rolling system of seamless steel tube and rolling technology thereof
CN104826868A (en) * 2015-02-10 2015-08-12 长葛市一鸣机械有限公司 Small-diameter seamless steel pipe floating mandrel continuous mill unit and seamless steel pipe production process
CN104874606A (en) * 2015-06-16 2015-09-02 攀钢集团成都钢钒有限公司 Production method of high-chromium ferrite stainless steel seamless pipe
CN104907353A (en) * 2015-06-16 2015-09-16 攀钢集团成都钢钒有限公司 Production method of high-chromium ferrite stainless-steel seamless steel pipe blank
CN107377662A (en) * 2016-04-01 2017-11-24 Sms集团股份有限公司 The manufacture method and system and centrifugally cast pipe and respective application of seamless hot-finished tube
CN107377662B (en) * 2016-04-01 2019-10-18 Sms集团股份有限公司 The application of the manufacturing method and manufacture system of seamless hot-finished tube and the centrifugally cast pipe of rolling and the hollow block manufactured by centrifugal casting
CN107363124A (en) * 2017-08-25 2017-11-21 攀钢集团研究院有限公司 The manufacture method of Aero-Space seamless steel pipe
CN107363124B (en) * 2017-08-25 2019-02-15 攀钢集团研究院有限公司 The manufacturing method of aerospace seamless steel pipe
CN109794510A (en) * 2019-03-28 2019-05-24 山东磐金钢管制造有限公司 A kind of production technology of seamless steel pipe
CN110404973A (en) * 2019-07-15 2019-11-05 扬州诚德钢管有限公司 A kind of manufacturing method for the seamless steel pipe that diameter is 760mm~914mm
CN110711779A (en) * 2019-10-26 2020-01-21 鑫鹏源智能装备集团有限公司 Control method for wall thickness of seamless steel tube

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