CN101775475A - Hot-rolled tube billet heating process - Google Patents
Hot-rolled tube billet heating process Download PDFInfo
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- CN101775475A CN101775475A CN201010110235A CN201010110235A CN101775475A CN 101775475 A CN101775475 A CN 101775475A CN 201010110235 A CN201010110235 A CN 201010110235A CN 201010110235 A CN201010110235 A CN 201010110235A CN 101775475 A CN101775475 A CN 101775475A
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Abstract
The invention relates to an annular furnace heating process for hot-rolled tube billet. The annular furnace comprises a furnace body and a rotary furnace bottom. The furnace body consists of six sections, i.e. a preheating section I, a preheating section II, a heating section I, a heating section II, a soaking section I and a soaking section II which are sequentially from a charging opening to a discharging opening. The inner side and the outer side of each section are respectively provided with a set of burners which are controlled by reversing valves. Sequential cyclic burning is carried out according to a determined reversing period and reversing interval. The tube billet is driven by the rotary furnace bottom to move from the charging opening to the discharging opening. The tube billet is discharged out of the furnace after sequentially undergoing preheating, heating and soaking. The head temperature of the hot tube billet coming out of the furnace is lower than the tail temperature thereof, and the temperature difference is controlled to be 30-60 DEG C. Through the reasonable setting of furnace temperature inside and outside the soaking sections and the control of the temperature difference between the head and the tail of the hot tube billet coming out of the furnace, the temperature of the head and the tail of a tubular billet for entering a continuous mill is uniform, thereby providing a better condition for the rolling of the continuous mill and effectively improving the quality and yield of the tubular billet.
Description
Technical field
The invention belongs to oil well pipe hot rolling production technical field, relate to the heating treatment process that a kind of oil well pipe hot rolling is produced, specifically is a kind of ring furnace heating process of hot-rolled tube billet.
Background technology
At present, the basic technology of production hot-rolled capillary pipe is on the domestic and international hot rolling retained mandrel continuous rolling production line: heating of pipe blank-perforation-continuous mill tandem rolling.The tapping temperature of pipe mainly is the needs from continuous mill, if it is low excessively to enter the hollow billet temperature of continuous mill, will produce behind the tandem rolling and embrace the plug phenomenon, cause and take off the rod difficulty, thin-walled tandem rolling pipe is also had the danger of being pulled open, thereby wish when hollow billet enters continuous mill higher temperature to be arranged, rule of thumb require behind the general tandem rolling about about 1080 ℃ for well.Consider pipe in transportation and technological process temperature drop and pipe when perforation because the hot temperature increase that produces of distortion, the final Heating temperature of pipe should satisfy rolling requirement 1250 ℃～1280 ℃ ability.
Although having considered the temperature of pipe when perforation, above-mentioned basic technology increases, but do not consider that the pipe temperature is different in the degree of vertically (on the length direction) increase, the head and tail temperature difference of perforation back hollow billet is generally at 30 ℃～60 ℃, and many multiple lengths when producing head and tail temperature difference bigger.This head and tail temperature difference will influence follow-up continuous rolling process, thereby the even property of the inhomogeneity of wall thickness of hollow forging behind the increase tandem rolling causes head to thicken.Thereby, for further improving pipe workpiece quality and lumber recovery, how to improve basic production technology, effectively utilize the characteristics of each technology, especially to carry out process modification be to need the problem that solves to the characteristics of heat accumulating type ring furnace heating.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of ring furnace heating process of improved hot-rolled tube billet is provided, this heating process can be given full play to the heating characteristics of heat accumulating type ring furnace, make the head and tail temperature that enters the continuous mill hollow billet comparatively even, the rolling better condition that provides of continuous mill is provided, and effectively improves hollow billet quality and lumber recovery.
Purpose of the present invention realizes by the following technical solutions:
A kind of ring furnace heating process of hot-rolled tube billet, it is characterized in that: described ring furnace comprises body of heater and rotary furnace bottom, body of heater is followed successively by two sections of preheated one-section, two sections of preheatings, one section of heating, two sections of heating, one section of soaking and soaking totally six sections by charging bole to discharge port, the inboard of each section and the outside respectively are provided with one group of burner, every group of burner controlled by reversing valve, according to the commutation cycle of setting and reversal interval circulating combustion successively; Pipe is placed on the rotary furnace bottom, drives by rotary furnace bottom and moves to discharge port from charging bole; Concrete steps and technology are as follows:
(1) preheating: this step is carried out in two sections of preheated one-section and preheatings; Pipe is entered in the body of heater by charging bole and at the uniform velocity advances in two sections of preheated one-section and preheatings; The inboard of preheated one-section is identical with temperature outside, and temperature range is 1000～1100 ℃, and be 28～30min warm up time; The inboard that preheating is two sections is identical with temperature outside, and temperature range is 1100～1200 ℃, and be 28～30min warm up time;
(2) heating: this step is carried out one section of heating with in heating two sections; Pipe is entered by two sections of preheatings and at the uniform velocity advances one section of heating with in heating two sections; The inboard of heating one section is identical with temperature outside, and temperature range is 1200～1330 ℃, and be 40～44min heat-up time; The inboard of heating two sections is identical with temperature outside, and temperature range is 1200～1330 ℃, and be 42～45min heat-up time;
(3) soaking: this step is carried out in two sections of one section of soaking and soaking; Pipe is entered by two sections of heating and at the uniform velocity advances in two sections of one section of soaking and soaking; One section inboard temperature range of soaking is 1200～1250 ℃, and the temperature outside scope is 1250～1280 ℃, and thermometric degree and internal-external temperature difference scope were controlled at 30～60 ℃ in the maintenance temperature outside was higher than, and soaking time is 23～25min; Two sections inboard temperature ranges of soaking are 1210～1250 ℃, and the temperature outside scope is 1260～1280 ℃, and thermometric degree and internal-external temperature difference scope were controlled at 30～60 ℃ in the maintenance temperature outside was higher than, and soaking time is 21～23min;
(4) come out of the stove: the pipe after the ring furnace heating is come out of the stove from discharge port, and the head of the heat pipe base of coming out of the stove (pipe that is introduced into tapping machine partly is called head) temperature is lower than the afterbody temperature, and temperature range is controlled at 30～60 ℃.
As a further improvement on the present invention, the central angle number of degrees of described preheated one-section, two sections of preheatings, one section of heating, two sections of heating, one section of soaking and two sections correspondences of soaking are respectively 48 °, 48 °, 69 °, 72 °, 39 ° and 36 °.
As a further improvement on the present invention, described rotary furnace bottom uniform rotation, rotational angular is 1.6 °/min～1.73 °/min.
The present invention compared with prior art, advantage is: the present invention can give full play to the burning feature of energy-storage type ring furnace, by the furnace temperature in the outside in the soaking zone rationally is set, the head and the afterbody temperature range of heat pipe base thereby control is come out of the stove, make that the head and tail temperature difference that enters the continuous mill hollow billet is less, bulk temperature is comparatively even, the rolling better condition that provides for continuous mill, and then effectively improve the evenness of wall thickness of hollow forging behind the tandem rolling, reduce head and thicken phenomenon, reduce the crop amount, improve lumber recovery, reduce production costs.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
The furnace bottom when ring furnace among the present invention includes body of heater and rotation, body of heater is followed successively by two sections of preheated one-section, two sections of preheatings, one section of heating, two sections of heating, one section of soaking and soaking totally six sections by charging bole to discharge port, and the central angle number of degrees of six section correspondences are respectively 48 °, 48 °, 69 °, 72 °, 39 ° and 36 °.The inboard of each section and the outside respectively are provided with one group of burner, and every group of burner controlled by reversing valve, according to the commutation cycle of setting and reversal interval circulating combustion successively; The inboard and the outside at each section are respectively equipped with a thermopair, the real-time furnace temperature in the outside in thermopair is used to measure, and furnace temperature fed back to controller, and control the operation of burner by controller according to furnace temperature, guarantee that the inboard of each section and temperature outside are in setting range.Concrete steps and technology are as follows:
Embodiment 1
Specification is to manufacture a finished product: Φ 139.7mm (diameter) * 9.17mm (wall thickness), steel grade are that the sleeve pipe of 30Mn2V is an example, its solid tubes blank specification is Φ 200mm (diameter) * 3300mm (length), the hollow hollow billet specification in perforation back is Φ 228mm (diameter) * 18.2mm (wall thickness) * 830mm (length), and production stage and technology are as follows:
1, ring furnace heating: pipe is packed into from charging bole in the ring furnace, is placed on the rotary furnace bottom, and drive by rotary furnace bottom and move to discharge port from charging bole, described rotary furnace bottom uniform rotation, rotational angular is 1.73 °/min; The step and the technology of heating are specially:
(1) preheating: this step is carried out in two sections of preheated one-section and preheatings, and the inboard of preheated one-section is identical with temperature outside, is respectively 1100 ℃, and be 28min warm up time; The inboard that preheating is two sections is identical with temperature outside, is respectively 1150 ℃, and be 28min warm up time;
(2) heating: this step is carried out one section of heating with in heating two sections; The inboard of heating one section is identical with temperature outside, is respectively 1250 ℃, and be 40min heat-up time; The inboard of heating two sections is identical with temperature outside, is respectively 1330 ℃, and be 42min heat-up time;
(3) soaking: this step is carried out in two sections of one section of soaking and soaking; One section inboard temperature of soaking is 1240 ℃, and temperature outside is 1280 ℃, and soaking time is 23min; Two sections inboard temperature of soaking are 1240 ℃, and temperature outside is 1280 ℃, and soaking time is 21min;
(4) come out of the stove: the pipe after the ring furnace heating is come out of the stove from discharge port, and the head of the heat pipe base of coming out of the stove (pipe that is introduced into tapping machine partly is called head) temperature is lower than the afterbody temperature, and temperature range is about 40 ℃.
2, tapping machine perforation: the heat pipe base after coming out of the stove is transported to the tapping machine foreground through chain, heat pipe base bulk temperature descends about 10 ℃ in the transportation, the pipe head temperature is about 1270 ℃ before the perforation, and the tail end temperature is about 1230 ℃, and head and tail temperature difference remains on about 40 ℃.Heat pipe base perforation back forms hollow hollow billet, and hollow billet produces when perforation in uneven end to end distortion heat and the technological process and has temperature drop, and the bulk temperature of the hollow hollow billet in perforation back is about 1220 ℃, and head temperature is a little more than the afterbody temperature, and the temperature difference is in 10 ℃.
3, continuous mill tandem rolling: the hollow hollow billet after the perforation enters five frame retained mandrel continuous mills and carries out tandem rolling after blowing borax and feed-through rod technology, the bulk temperature that enters the hollow hollow billet of continuous mill is about 1160 ℃, head temperature is a little more than the afterbody temperature, and the temperature difference is in 10 ℃.Become hollow forging behind the hollow hollow billet tandem rolling, the bulk temperature of hollow forging is 1080～1090 ℃, satisfies the continuous rolling process requirement.
Production tube after the above-mentioned hot rolling is detected, and vertical wall thickness of production tube is even, and the head wall thickness is better.Compare with traditional technology, the crop end of the production tube of making reduces to 1m by 2m, and the crop end loss is reduced to 3.83% by 7.67%, and lumber recovery improves greatly, and the hot rolling cost significantly reduces.
The wing furnace temperature differs 40 ℃ inside and outside two sections of one section of present embodiment control soaking and the soaking, guarantee that heat pipe base head and tail temperature difference before perforation is about 40 ℃, thereby the head and tail temperature difference of hollow billet is controlled in 10 ℃ when making the head and tail temperature difference of perforation back hollow billet and entering tandem rolling, help to reduce the crop amount, reduce cost.
Embodiment 2
Specification is to manufacture a finished product: Φ 139.7mm (diameter) * 7.72mm (wall thickness), steel grade are that the sleeve pipe of 30Mn2 is an example, its solid tubes blank specification is: Φ 200mm (diameter) * 3850mm (length), perforation back hollow billet specification is Φ 227mm (diameter) * 17.2mm (wall thickness) * 1046mm (length), and production stage and technology are as follows:
1, ring furnace heating: pipe is packed into from charging bole in the ring furnace, is placed on the rotary furnace bottom, and drive by rotary furnace bottom and move to discharge port from charging bole, described rotary furnace bottom uniform rotation, rotational angular is 1.73 °/min; The step and the technology of heating are specially:
(1) preheating: this step is carried out in two sections of preheated one-section and preheatings, and the inboard of preheated one-section is identical with temperature outside, is respectively 1100 ℃, and be 28min warm up time; The inboard that preheating is two sections is identical with temperature outside, is respectively 1150 ℃, and be 28min warm up time;
(2) heating: this step is carried out one section of heating with in heating two sections; The inboard of heating one section is identical with temperature outside, is respectively 1240 ℃, and be 40min heat-up time; The inboard of heating two sections is identical with temperature outside, is respectively 1330 ℃, and be 42min heat-up time;
(3) soaking: this step is carried out in two sections of one section of soaking and soaking; One section inboard temperature of soaking is 1230 ℃, and temperature outside is 1280 ℃, and soaking time is 23min; Two sections inboard temperature of soaking are 1230 ℃, and temperature outside is 1280 ℃, and soaking time is 21min;
(4) come out of the stove: the pipe after the ring furnace heating is come out of the stove from discharge port, and the head of the heat pipe base of coming out of the stove (pipe that is introduced into tapping machine partly is called head) temperature is lower than the afterbody temperature, and temperature range is about 50 ℃.
2, tapping machine perforation: the heat pipe base after coming out of the stove is transported to the tapping machine foreground through chain, heat pipe base bulk temperature descends about 10 ℃ in the transportation, the pipe head temperature is about 1270 ℃ before the perforation, and the tail end temperature is about 1220 ℃, and head and tail temperature difference remains on about 50 ℃.Heat pipe base perforation back forms hollow hollow billet, and hollow billet produces when perforation in uneven end to end distortion heat and the technological process and has temperature drop, and the bulk temperature of the hollow hollow billet in perforation back is about 1210 ℃, and head temperature is a little more than the afterbody temperature, and the temperature difference is in 10 ℃.
3, continuous mill tandem rolling: the hollow hollow billet after the perforation enters five frame retained mandrel continuous mills and carries out tandem rolling after blowing borax and feed-through rod technology, the bulk temperature that enters the hollow hollow billet of continuous mill is about 1150 ℃, head temperature is a little more than the afterbody temperature, and the temperature difference is in 10 ℃.Become hollow forging behind the hollow hollow billet tandem rolling, the bulk temperature of hollow forging is about 1080 ℃, satisfies the continuous rolling process requirement.
Production tube after the above-mentioned hot rolling is detected, and vertically wall thickness is even, and the head wall thickness is better, compare with traditional technology, the crop end of the production tube of making reduces to 1.6m by 2.5m, and the crop end loss is reduced to 4.41% by 6.88%, lumber recovery improves greatly, and the hot rolling cost significantly reduces.
The wing furnace temperature differs 50 ℃ inside and outside two sections of one section of present embodiment control soaking and the soaking, guarantee that heat pipe base head and tail temperature difference before perforation is about 50 ℃, thereby the head and tail temperature difference of hollow billet helps to reduce the crop amount when making the head and tail temperature difference of perforation back hollow billet and entering tandem rolling in 10 ℃, reduces cost.
Embodiment 3
Specification is to manufacture a finished product: Φ 244.5mm (diameter) * 8.94mm (wall thickness), steel grade are that the sleeve pipe of 30Mn2 is an example, its solid tubes blank specification is: Φ 280mm (diameter) * 2750mm (length), perforation back hollow billet specification is Φ 304mm (diameter) * 22.4mm (wall thickness) * 8393mm (length), and production stage and technology are as follows:
1, ring furnace heating: pipe is packed into from charging bole in the ring furnace, is placed on the rotary furnace bottom, and drive by rotary furnace bottom and move to discharge port from charging bole, described rotary furnace bottom uniform rotation, rotational angular is 1.6 °/min; The step and the technology of heating are specially:
(1) preheating: this step is carried out in two sections of preheated one-section and preheatings, and the inboard of preheated one-section is identical with temperature outside, is respectively 1100 ℃, and be 30min warm up time; The inboard that preheating is two sections is identical with temperature outside, is respectively 1150 ℃, and be 30min warm up time;
(2) heating: this step is carried out one section of heating with in heating two sections; The inboard of heating one section is identical with temperature outside, is respectively 1240 ℃, and be 44min heat-up time; The inboard of heating two sections is identical with temperature outside, is respectively 1330 ℃, and be 45min heat-up time;
(3) soaking: this step is carried out in two sections of one section of soaking and soaking; One section inboard temperature of soaking is 1235 ℃, and temperature outside is 1280 ℃, and soaking time is 25min; Two sections inboard temperature of soaking are 1235 ℃, and temperature outside is 1280 ℃, and soaking time is 23min;
(4) come out of the stove: the pipe after the ring furnace heating is come out of the stove from discharge port, and the head of the heat pipe base of coming out of the stove (pipe that is introduced into tapping machine partly is called head) temperature is lower than the afterbody temperature, and temperature range is about 45 ℃.
2, tapping machine perforation: the heat pipe base after coming out of the stove is transported to the tapping machine foreground through chain, heat pipe base bulk temperature descends about 10 ℃ in the transportation, the pipe head temperature is about 1270 ℃ before the perforation, and the tail end temperature is about 1225 ℃, and head and tail temperature difference remains on about 45 ℃.Heat pipe base perforation back forms hollow hollow billet, and hollow billet produces when perforation in uneven end to end distortion heat and the technological process and has temperature drop, and the bulk temperature of the hollow hollow billet in perforation back is about 1220 ℃, and head temperature is a little more than the afterbody temperature, and the temperature difference is in 10 ℃.
3, continuous mill tandem rolling: the hollow hollow billet after the perforation enters five frame retained mandrel continuous mills and carries out tandem rolling after blowing borax and feed-through rod technology, the bulk temperature that enters the hollow hollow billet of continuous mill is about 1160 ℃, head temperature is a little more than the afterbody temperature, and the temperature difference is in 10 ℃.Become hollow forging behind the hollow hollow billet tandem rolling, the bulk temperature of hollow forging is about 1080 ℃, satisfies the continuous rolling process requirement.
Production tube after the above-mentioned hot rolling is detected, and vertically wall thickness is even, and the head wall thickness is better, compare with traditional technology, the crop end of the production tube of making reduces to 1.3m by 2.2m, and the crop end loss is reduced to 5.44% by 9.21%, lumber recovery improves greatly, and the hot rolling cost significantly reduces.
The wing furnace temperature differs 45 ℃ inside and outside two sections of one section of present embodiment control soaking and the soaking, guarantee that heat pipe base head and tail temperature difference before perforation is about 45 ℃, thereby the head and tail temperature difference of hollow billet helps to reduce the crop amount when making the head and tail temperature difference of perforation back hollow billet and entering tandem rolling in 10 ℃, reduces cost.
Claims (3)
1. the ring furnace heating process of a hot-rolled tube billet, it is characterized in that: described ring furnace comprises body of heater and rotary furnace bottom, body of heater is followed successively by two sections of preheated one-section, two sections of preheatings, one section of heating, two sections of heating, one section of soaking and soaking totally six sections by charging bole to discharge port, the inboard of each section and the outside respectively are provided with one group of burner, every group of burner controlled by reversing valve, according to the commutation cycle of setting and reversal interval circulating combustion successively; Pipe is placed on the rotary furnace bottom, drives by rotary furnace bottom and moves to discharge port from charging bole; Concrete steps and technology are as follows:
(1) preheating: this step is carried out in two sections of preheated one-section and preheatings; Pipe is entered in the body of heater by charging bole and at the uniform velocity advances in two sections of preheated one-section and preheatings; The inboard of preheated one-section is identical with temperature outside, and temperature range is 1000～1100 ℃, and be 28～30min warm up time; The inboard that preheating is two sections is identical with temperature outside, and temperature range is 1100～1200 ℃, and be 28～30min warm up time;
(2) heating: this step is carried out one section of heating with in heating two sections; Pipe is entered by two sections of preheatings and at the uniform velocity advances one section of heating with in heating two sections; The inboard of heating one section is identical with temperature outside, and temperature range is 1200～1330 ℃, and be 40～44min heat-up time; The inboard of heating two sections is identical with temperature outside, and temperature range is 1200～1330 ℃, and be 42～45min heat-up time;
(3) soaking: this step is carried out in two sections of one section of soaking and soaking; Pipe is entered by two sections of heating and at the uniform velocity advances in two sections of one section of soaking and soaking; One section inboard temperature range of soaking is 1200～1250 ℃, and the temperature outside scope is 1250～1280 ℃, and thermometric degree and internal-external temperature difference scope were controlled at 30～60 ℃ in the maintenance temperature outside was higher than, and soaking time is 23～25min; Two sections inboard temperature ranges of soaking are 1210～1250 ℃, and the temperature outside scope is 1260～1280 ℃, and thermometric degree and internal-external temperature difference scope were controlled at 30～60 ℃ in the maintenance temperature outside was higher than, and soaking time is 21～23min;
(4) come out of the stove: the pipe after the ring furnace heating is come out of the stove from discharge port, and the head temperature of the heat pipe base of coming out of the stove is lower than the afterbody temperature, and temperature range is controlled at 30～60 ℃.
2. the ring furnace heating process of hot-rolled tube billet as claimed in claim 1, its feature also is: the central angle number of degrees of described preheated one-section, two sections of preheatings, one section of heating, two sections of heating, one section of soaking and two sections correspondences of soaking are respectively 48 °, 48 °, 69 °, 72 °, 39 ° and 36 °.
3. the ring furnace heating process of hot-rolled tube billet as claimed in claim 1, its feature also is: described rotary furnace bottom uniform rotation, rotational angular are 1.6 °/min～1.73 °/min.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041372A (en) * | 2010-12-31 | 2011-05-04 | 湖北新冶钢特种钢管有限公司 | Method for heating low-alloy carbon steel large tube blank in annular furnace |
| CN104046770A (en) * | 2014-06-19 | 2014-09-17 | 马钢(集团)控股有限公司 | Method for controlling uniformity of temperature field of heating furnace |
| CN105420486A (en) * | 2015-11-03 | 2016-03-23 | 邯钢集团邯宝钢铁有限公司 | Heating control method of steel rolling heating furnace applicable to pipeline steel |
| CN106086372A (en) * | 2016-08-02 | 2016-11-09 | 内蒙古包钢钢联股份有限公司 | The heating means of seamless steel pipe |
| CN110479924A (en) * | 2019-08-26 | 2019-11-22 | 张家港中环海陆高端装备股份有限公司 | Large-scale ring forging streamlined manufacturing process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507962A (en) * | 2002-12-18 | 2004-06-30 | 中国科学院金属研究所 | High-temperature alloy tube billet working method |
| CN101439365B (en) * | 2008-11-21 | 2011-09-14 | 攀钢集团成都钢铁有限责任公司 | Method for rolling seamless steel pipe from die-casting hollow steel ingot |
| CN101428298B (en) * | 2008-12-03 | 2010-07-21 | 无锡西姆莱斯石油专用管制造有限公司 | Process for manufacturing pipeline tube |
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2010
- 2010-02-03 CN CN2010101102358A patent/CN101775475B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041372A (en) * | 2010-12-31 | 2011-05-04 | 湖北新冶钢特种钢管有限公司 | Method for heating low-alloy carbon steel large tube blank in annular furnace |
| CN104046770A (en) * | 2014-06-19 | 2014-09-17 | 马钢(集团)控股有限公司 | Method for controlling uniformity of temperature field of heating furnace |
| CN105420486A (en) * | 2015-11-03 | 2016-03-23 | 邯钢集团邯宝钢铁有限公司 | Heating control method of steel rolling heating furnace applicable to pipeline steel |
| CN105420486B (en) * | 2015-11-03 | 2017-06-23 | 邯钢集团邯宝钢铁有限公司 | A kind of heater for rolling steel method for heating and controlling suitable for pipe line steel |
| CN106086372A (en) * | 2016-08-02 | 2016-11-09 | 内蒙古包钢钢联股份有限公司 | The heating means of seamless steel pipe |
| CN106086372B (en) * | 2016-08-02 | 2018-05-25 | 内蒙古包钢钢联股份有限公司 | The heating means of seamless steel pipe |
| CN110479924A (en) * | 2019-08-26 | 2019-11-22 | 张家港中环海陆高端装备股份有限公司 | Large-scale ring forging streamlined manufacturing process |
| CN110479924B (en) * | 2019-08-26 | 2020-11-13 | 张家港中环海陆高端装备股份有限公司 | Production line type manufacturing method of large-scale ring forging |
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| CN101775475B (en) | 2011-07-20 |
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