CN101985132A - Method for producing thermally tandem-rolled seamless steel pipes - Google Patents
Method for producing thermally tandem-rolled seamless steel pipes Download PDFInfo
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- CN101985132A CN101985132A CN 201010515120 CN201010515120A CN101985132A CN 101985132 A CN101985132 A CN 101985132A CN 201010515120 CN201010515120 CN 201010515120 CN 201010515120 A CN201010515120 A CN 201010515120A CN 101985132 A CN101985132 A CN 101985132A
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Abstract
The invention discloses a method for producing thermally tandem-rolled seamless steel pipes. The method comprises the following steps that: a buffering attemperator stores continuous cast round steel provided by a steelmaking continuous casting workshop in a heat preservation state in a way of buffering and provides the continuous cast round steel for a stepping soaking pit furnace; the stepping soaking pit furnace soaks and heats the continuous cast round steel provided by the buffering attemperator; a hot saw cutting device performs hot saw cutting on the continuous cast round steel provided by the stepping soaking pit furnace to obtain fixed-size tube blanks; and a heat preservation cover preserves or raises the temperature of the fixed-size tube blanks provided by the hot saw cutting device and conveys the fixed-size tube blanks into a perforator to perforate the fixed-size tube blanks at the temperature needed by the perforator. By the invention, the process of 'hot loading and hot conveying' is realized. Compared with the traditional production process, the method can save over 40 percent of energy and reduce over 1 percent of burning loss.
Description
Technical field
The present invention relates to the production technology of steel tube technical field, be specifically related to a kind of hot continuous rolling method for producing seamless steel tube.
Background technology
Traditional method for producing seamless steel tube is specially: provide after length is the cold conditions continuous casting circular tube blank of 6～9m in the steel-making continuous casting workshop, through cold saw (or the disconnected method of other cold cut) continuous casting circular tube blank is cut into length in the hot-rolled pipe workshop and is about 1.5～4.5m scope scale; Heating cold conditions incision becomes the circular pipe blank of 1.5～4.5m scope scale in traditional annular furnace, sends to perforation after being heated to 1150～1280 ℃.The method for producing seamless steel tube of the cooling earlier of this traditional continuous casting circular tube blank, heating has again been wasted the energy greatly.
At home and abroad the hot continuous rolling system in steel plate field and shaped steel (containing rod, line) field is based in the hot rolling system of producing building materials, generally adopt " continuous casting and rolling " or " hot-loading and hot-conveying " rolling production method, obtained gratifying results aspect the saving energy and the reduction scaling loss.
When the hot continuous rolling guard system adopts " hot-loading and hot-conveying " technology, can be subjected to the restriction of above-mentioned traditional handicraft, and, also have many difficult points at aspects such as the technology coupling in steel-making continuous casting and hot-rolled pipe workshop and production operations, specify as follows:
(1) in the above-mentioned traditional handicraft, annular furnace can only heat the circular pipe blank of 1.5～4.5m scope scale.When the maximum pipe length of annular furnace heating during more than or equal to 5m, can give that machinery and charging and discharging machine structural design bring technical difficulty at the bottom of the rotary furnace, can obviously reduce the efficiency of heating surface simultaneously.For satisfy rolling rhythm be the female pipe of 15s, 240/hour requirement, charging and discharging machine must adopt feed the simultaneously mode of (or discharging simultaneously) of two pipes, in design and the actual production certain difficulty is arranged all;
(2) in the seamless steel tube production field, an independent cover annual production more than 500,000 tons/year or overlap unit combination annual production more than 500,000 tons/year more, and required continuous casting circular tube blank is 2～4 kinds of specification persons, be and the primary condition of steel-making continuous casting workshop coupling, all do not possess this condition mostly and built at present with the producer of having gone into operation;
(3) built at present and the steel-making continuous casting workshop of the producer of having gone into operation is the split setting with the hot-rolled pipe workshop, after the intermediate transportation in two workshops, continuous casting circular tube blank can't guarantee higher charging temperature (this temperature is to embody the sensitivity value of energy-saving effect), and this also is a restriction condition that adopts " hot-loading and hot-conveying " technology;
(4) if adopt " hot-loading and hot-conveying " production method, its hot-loading and hot-conveying ratio (output that adopts the hot-loading and hot-conveying method to produce accounts for the percentage of total output) should be more than 40%, otherwise overall economic efficiency will be very poor.And, built the ratio that is difficult to realize above-mentioned hot-loading and hot-conveying with the producer of having gone into operation at present because product variety and steel grade are more.
Summary of the invention
Technical problem to be solved by this invention is the defective at prior art, proposes a kind of hot continuous rolling method for producing seamless steel tube, realizes the technology of " hot-loading and hot-conveying ", saves the energy.
In order to solve the problems of the technologies described above, the invention provides a kind of hot continuous rolling method for producing seamless steel tube, comprising:
The buffering attemperator cushions under keeping warm mode deposits the continuous casting circular tube blank that the steel-making continuous casting workshop provides, and continuous casting circular tube blank is offered the step-by-step movement soaking pit;
The step-by-step movement soaking pit carries out soaking and intensification with the continuous casting circular tube blank that described buffering attemperator provides;
The continuous casting circular tube blank that the hot saw cutting device provides described step-by-step movement soaking pit carries out hot saw cuts, and obtains the scale pipe;
The scale pipe that stay-warm case provides described hot saw cutting device is incubated or heats up, and is temperature required down at punch, described scale pipe sent into described punch bore a hole.
Further, described buffering attemperator comprises: stepping mechanism, attemperator and temperature measuring equipment; Described stepping mechanism adopts single step to transfer mode or multistep is transferred mode; Described attemperator is made of the heat-insulating material that covers described continuous casting circular tube blank and stepping mechanism; Described temperature measuring equipment provides the continuous casting circular tube blank temperature information to described step-by-step movement soaking pit, and described step-by-step movement soaking pit specifically heats up to continuous casting circular tube blank according to the continuous casting circular tube blank temperature information that described temperature measuring equipment provides.
Further, described attemperator comprises steel structure support and circumferentially is fixed on pottery fiber module on the described steel structure support.
Further, described buffering attemperator is many groups, and described many group buffering attemperators cooperatively interact, and divide degree of control to provide continuous casting circular tube blank to described step-by-step movement soaking pit to set.
The present invention adopts the step-by-step movement soaking pit to replace annular furnace to realize soaking and intensification function.Particularly, the step-by-step movement soaking pit heats up the continuous casting circular tube blank that the steel-making continuous casting workshop provides; Then, the continuous casting circular tube blank that the hot saw cutting device provides the step-by-step movement soaking pit carries out hot saw cuts, and obtains the scale pipe.The present invention has realized the technology of " hot-loading and hot-conveying ", compares with traditional processing technology, can save the energy more than 40%, and can reduce the scaling loss more than 1%.
Description of drawings
Fig. 1 is the schematic flow sheet of hot continuous rolling method for producing seamless steel tube one embodiment of the present invention;
Fig. 2 is the structural representation of the system that is suitable for of hot continuous rolling method for producing seamless steel tube provided by the invention;
Fig. 3 is the position view of buffering attemperator in system among the present invention;
Fig. 4 is the structural representation of two groups of buffering attemperators among the present invention;
Fig. 5 is the structural representation in insulation tunnel among the present invention;
Fig. 6 is the structural representation that vertically moves type swing type hot saw of the present invention;
Fig. 7 is the schematic diagram of hot saw separating and cutting process of the present invention.
The specific embodiment
Since in traditional seamless steel tube production technology annular furnace can't heated length more than or equal to the pipe of 5m, the present invention adopts the step-by-step movement soaking pit to replace annular furnace to realize soaking and intensification function.Particularly, step-by-step movement soaking pit temperature that the steel-making continuous casting workshop is provided is that 750～850 ℃, length are that the continuous casting circular tube blank of 6～9m is warming up to 1150～1280 ℃; Then, the continuous casting circular tube blank that the hot saw cutting device provides the step-by-step movement soaking pit carries out hot saw cuts, and obtaining length is the scale pipe of 1.5～4.5m.The present invention has realized the technology of " hot-loading and hot-conveying ", compares with traditional processing technology, can save the energy more than 40%, and can reduce the scaling loss more than 1%.
Below in conjunction with accompanying drawing and preferred implementation technical scheme of the present invention is elaborated.
As shown in Figure 1, be the schematic flow sheet of hot continuous rolling method for producing seamless steel tube one embodiment of the present invention.The method that present embodiment provides comprises:
The continuous casting circular tube blank that step 102, step-by-step movement soaking pit will cushion attemperator to be provided carries out soaking and intensification;
The continuous casting circular tube blank that step 103, hot saw cutting device provide the step-by-step movement soaking pit carries out hot saw cuts, and obtains the scale pipe;
The scale pipe that step 104, stay-warm case provide the hot saw cutting device is incubated or heats up, and is temperature required down at punch, the scale pipe sent into punch bore a hole.
Fig. 2 is the system architecture schematic diagram that hot continuous rolling method for producing seamless steel tube provided by the invention is suitable for.As shown in Figure 2, this system comprises that mainly hot continuous casting circular tube blank sends to the equipment of sending between the punch from the steel-making continuous casting workshop, specifically comprises: step-by-step movement soaking pit 11 and hot saw cutting device 12.Wherein, step-by-step movement soaking pit 11 is used for the continuous casting circular tube blank that the steel-making continuous casting workshop provides is heated up; The continuous casting circular tube blank that hot saw cutting device 12 is used for that step-by-step movement soaking pit 11 is provided carries out hot saw cuts, and obtains the scale pipe.
Specifically, the steel-making continuous casting workshop is that the hot continuous casting circular tube blank of 6～9m is sent into workshop, native system place (the following hot continuous rolling pipe workshop that also claims) with the roller-way means of transportation with length, and native system carries out thermometric to continuous casting circular tube blank; Simultaneously, material tracking begins by root numbering and record retort number, steel grade, pipe diameter, pipe length and pipe temperature etc.; Hot continuous rolling pipe workshop is that 750～850 ℃ continuous casting circular tube blank is sent into the step-by-step movement soaking pit 11 that is located on the scaoffold (being higher than 5.5m) and carried out soaking and intensification with temperature through roller-way and lifting device when ordinary production fast; Continuous casting circular tube blank is raised to 1150～1280 ℃ and comes out of the stove in step-by-step movement soaking pit 11; The continuous casting circular tube blank that is warmed up to 1150～1280 ℃ enters hot saw cutting device 12.This hot saw cutting device 12 uses hot saw 3 to cut into the preceding required 1.5～4.5m scale pipe of tube rolling 6～9m continuous casting circular tube blank.
Further, this system can also comprise buffering attemperator 13, is used for cushioning under keeping warm mode depositing the continuous casting circular tube blank that the steel-making continuous casting workshop provides, and continuous casting circular tube blank is offered described step-by-step movement soaking pit 11.This buffering attemperator 13 is applicable to the situation of the unplanned stopping production in hot continuous rolling pipe workshop.Specifically, when the unplanned stopping production in hot continuous rolling pipe workshop, the continuous casting circular tube blank that the steel-making continuous casting workshop provides is admitted to buffering attemperator 13 through roller-way and transfer mechanism, cushions under keeping warm mode and deposits.According to the difference of off-time, the working system of different gears can be set.In a single day the hot continuous rolling pipe returns to normal production, and the pipe that the shutdown period buffering is deposited is sent into the step-by-step movement soaking pit 11 that is located on the scaoffold according to plan fast.
Further again, this system can also comprise stay-warm case 14, and the scale pipe that is used for that hot saw cutting device 12 is provided is incubated or heats up, and is temperature required following at punch 15, the scale pipe sent into punch 15 bore a hole.Stay-warm case 14 is incubated the scale pipe of 1.5～4.5m or heats up, and under the prerequisite that guarantees punch 15 required necessary temps (〉=1050 ℃), sends into punch 15 and bores a hole by order is set.
The preferable service condition of said system is: year hot rolled seamless steel tube output is more than 500,000 tons/year; The product steel grade is based on (not being suitable for to roll off the production line make the steel grade of Non-Destructive Testing, reconditioning or machined and the special type of cooling by root) such as carbon steel and low alloy steels; During ordinary production, the continuous casting circular tube blank temperature that the steel-making continuous casting workshop is sent into before the step-by-step movement soaking pit 11 should be 750～850 ℃; The hot-loading and hot-conveying ratio of present embodiment should be more than 70～80%.
According to customer requirements, 65t converter scheme or 90t electric furnace scheme can be chosen in above-mentioned steel-making continuous casting workshop.With 90t electric furnace scheme is example, and the steel-making continuous casting workshop mainly comprises: 1 90t electric arc furnaces, 1 95tLF refining furnace, 1 R8m six machines, six stream round billet continuous casting machine and the supporting auxilliary facility of public affairs thereof.This workshop maximum can provide 900,000 tons/year continuous casting circular tube blank.
Above-mentioned hot continuous rolling pipe workshop can be φ 159.0mm three-roller full-floating tandem rolling pipe workshop, and the principal item of its product comprises carries fluid seamless steel pipe, structure seamless steel pipe, seamless steel tubes for low and medium pressure etc.The products material that adopt in this workshop can be the continuous casting circular tube blank of Φ 130mm, Φ 150mm, three kinds of diameters of Φ 180mm, and its product specification is: outer diameter of steel pipes is Φ 25～159mm, and thickness of steel pipe is 2.5～12mm, and steel pipe length is 6～12m.The annual production in this workshop can reach 70～800,000 tons of seamless steel pipes.Hot continuous rolling pipe workshop also comprises cone type piercer 15, the 8 frame tandem rolling pipes and the plug circulatory system, takes off equipment such as excellent machine, through inductive arrangement, stretch-reducing mill and cold bed except comprising buffering attemperator 13, step-by-step movement soaking pit 11, hot saw cutting device 12 and stay-warm case 14.
Introduce the concrete structure and the performance of each equipment in the hot continuous rolling seamless steel tube production system respectively below by concrete example.
The buffering attemperator
As shown in Figure 3, be the position view of buffering attemperator in system among the present invention, circular pipe blank is through after converter or electric arc furnaces, the refining furnace, outgases, modified, temperature adjustment handles, and sends into the R8 conticaster, sends into the buffering attemperator then.The buffering attemperator has buffering and the dual-use function that is incubated.Pooling feature is meant provides the adhoc buffer of continuous casting circular tube blank to deposit to the steel-making continuous casting workshop when unplanned stopping production.Unplanned stopping production mainly refers to the stopping production that various accidents such as machinery, electric and operation cause, 600～800h is arranged every year approximately.Can improve 8～10% hot charging ratio by pooling feature.Heat insulation function is meant by covering insulation material around the continuous casting circular tube blank of depositing, can in the resting period, the pipe temperature be remained on more than 600 ℃ in certain buffering.
The buffering attemperator can be many groups, and these many group buffering attemperators cooperatively interact, and divide degree of control to provide continuous casting circular tube blank to the step-by-step movement soaking pit to set.With two groups of buffering attemperators is example, as shown in Figure 4, is the structural representation of two groups of buffering attemperators among the present invention.If the off-time is 10～40min, when the off-time was 10～20min, the major function of first group of buffering attemperator 21 was quick handovers, and the major function of second group of buffering attemperator 22 is that buffering is deposited; When the off-time was 21～40min, first group and second group buffering attemperator all was used for buffering and deposits.
The buffering attemperator comprises stepping mechanism, and this stepping mechanism can adopt single step to transfer mode or multistep is transferred mode.Deposit in order to satisfy buffering, can send into the step-by-step movement soaking pit at the pipe that the very first time of resuming production is deposited buffering again, divide degree of control for the buffering attemperator is provided with buffer time.
With 4 grades of branch degree of controls is example, and according to off-time 10min, 20min, 30min, 40min are divided into 4 grades of branch degree of controls, and the stepping mechanism in such first group and second group buffering attemperator is divided into two sections: I section and II section.Wherein the effective length of I section and II section all is about 8m.If the maximum rhythm of supplied materials is 120p/h (2 multiple length), supplied materials cycle time is 30s; The minimum rhythm of supplied materials is 60p/h (4 multiple length), and supplied materials cycle time is 60s.The stepping mechanism step pitch of single group buffering attemperator is 200mm.
When the off-time was 10～20min, the major function of first group of buffering attemperator 21 was quick handovers, and the major function of second group of buffering attemperator 22 is that quick handover (I section) and single step buffering are deposited (II section), but 10～40 continuous casting circular tube blanks of buffer memory; When the off-time was 25～40min, two groups of buffering attemperators were enabled pooling feature simultaneously, but 80 continuous casting circular tube blanks of maximum buffer memory.
When stepping mechanism is selected to transfer function fast, can transfer 3 step pitches fast, stepping mechanism time of action is 18s.Simultaneously, time work period of operation such as single pipe feed, roller-way transportation is designed to 20s.
Present embodiment adopts stepping mechanism to transfer pipe, and pipe need not rotate in the lifting handover process, and can prevent that this handover mode is better than steel-pushing type because the existence of iron scale causes built-in beam to shorten the life-span because of friction, scuffing.Adopting stepping mechanism is the best means of transportation that realizes pipe material tracking function.Present embodiment has been realized the Stroke Control that electromechanical integration is regulated rhythm and corresponding different pipe diameters, and two groups of stepping mechanisms all can be divided into two sections, can adopt single step to transfer mode (speed is slower) or multistep handover mode (speed is very fast) handover pipe.
The buffering attemperator also comprises attemperator, and this attemperator is made of the heat-insulating material that covers continuous casting circular tube blank and stepping mechanism.For instance, attemperator can comprise steel structure support and circumferentially be fixed on pottery fiber module (thickness is about 250mm) on the steel structure support, forms the insulation tunnel, as shown in Figure 5, is the structural representation in insulation tunnel among the present invention.Insulation tunnel 31, inlet roller-way 32, built-in beam 33 (being steel structure support) and stepping mechanism 34 have been shown among Fig. 5.
The angle bar formula modular structure of heat-insulating material can be adopted in the insulation tunnel among the present invention.Wherein, the arrangement mode of pottery fiber module adopts " block form ", promptly forward arranges along the module compression direction.Heat-insulating material and angle bar formula modular structure that the present invention adopts, the high temperature resistant light-duty Thermo Isolation Technique that is combined into is promoted the use of in the stove field.This new technology is adopted in the insulation tunnel among the present invention, and it has can bear 1250 ℃ of high temperature, heat-insulating property is good and light (the 250kg/m of unit area loading
2) etc. characteristics.
This covered structure design is compared with exposed aerial mode, when the off-time is 40min to the maximum, the continuous casting circular tube blank temperature is remained on more than 600 ℃.
The buffering attemperator also comprises temperature measuring equipment, is used for providing the continuous casting circular tube blank temperature information to the step-by-step movement soaking pit, makes the step-by-step movement soaking pit heat up to continuous casting circular tube blank according to the continuous casting circular tube blank temperature information that temperature measuring equipment provides.
The step-by-step movement soaking pit
The maximum characteristics of this step-by-step movement soaking pit are its purposes, use object and function of use.Its purposes is to realize the hot-loading and hot-conveying mode of production, can satisfy the equal heat request that the steel-making continuous casting workshop provides the heat pipe base; Its use is the continuous casting circular tube blank (being 2～4 multiple lengths of the required scale of tube rolling) that 750～850 ℃ of (referring to the charging temperature into the step-by-step movement soaking pit), length are 6～9m to the temperature that is directly provided by the steel-making continuous casting workshop is provided; Its function of use is by soaking and intensification, makes pipe reach 1150～1280 ℃ tapping temperature.
Adopt annular furnace to compare with traditional handicraft, the one-time investment of step-by-step movement soaking pit has reduced 20% in the native system, and the workshop area occupied has reduced 60%, and removes the iron scale that occurs because of heating easily.
The hot saw cutting device
The present invention can adopt and vertically move type swing type hot saw as the hot saw cutting device, as shown in Figure 6, be the structural representation that vertically moves type swing type hot saw of the present invention, comprise hot saw 41, hot pipe conveyor roller 42, vertically move dolly 43 and sawdust collection device 44.Hot saw is cut the cycle maximum and be can be 25s.Vertically move the hot saw product that type swing type hot saw is a routine techniques, be characterized in vertically can moving, and realize assigned address swing sawing heat pipe base according to the technology position.Hot saw carries the vibration-damping noise-reducing device, and its noise satisfies national requirements for environmental protection.The employing hydraulic cylinder is depressed in the hot saw swing.
As shown in Figure 7, be the schematic diagram of hot saw separating and cutting process of the present invention.The hot pipe of 53 alignment is finished the scale sawing simultaneously by two hot saws of 1 multiple length of spacing in the sideboard position.The distance of cutting position 51 among Fig. 7 and cutting between the position 52 is 1 multiple length, and this distance can be adjusted.According to this hot saw separating and cutting process, 4 multiple lengths need be cut 3 times, and 3 multiple lengths need be cut 2 times, and 2 multiple lengths need be cut 1 time.Cut lengths is determined by control hot saw run location.
Supplied materials length is 6～9m, and the maximum multiple length number of pipe is 4.For instance,, can be used as four multiple lengths of 1.5m scale if supplied materials length is 6m, or two multiple lengths of 3.0m; If supplied materials length is 7～7.5m, can be used as two multiple lengths of 3.5m scale, or the triple scale of 2.5m scale; If supplied materials length is 8m, can be used as four multiple lengths of 2.0m scale, or two multiple lengths of 4.0m scale; If supplied materials length is 9m, can be used as the triple scale of 3.0m scale, or two multiple lengths of 4.5m scale.
The present invention adopts hot saw to divide incision technology, the conventional production methods in steel-making continuous casting workshop and hot-rolled pipe workshop is remained unchanged substantially, being that the steel-making continuous casting workshop still provides length at 6～9m continuous casting circular tube blank, is the hot pipe of 750～850 ℃ (referring to the charging temperature into the step-by-step movement soaking pit) but need ask; The hot-rolled pipe workshop still is supplied to 1.5～4.5m cut lengths pipe before tube rolling.Difference is that conventional production methods is that the cold conditions pipe is cut off, and obtain 1.5～4.5m cut lengths pipe, and the present invention carries out sawing to hot pipe, obtains same cut lengths pipe.
Stay-warm case
Stay-warm case can adopt the induction mode of heating of through type, or the resistance-type mode of heating, and maximum intensification can reach 100 ℃.Its objective is that slightly the hot pipe of temperature drop heats up, enter the desired rolling temperature of punch to reach.
In order to satisfy the requirement of depositing 1～3 scale pipe, stay-warm case length is about 10m.The heat-insulating material of stay-warm case can be identical with the buffering attemperator with its structure.
Hot continuous rolling seamless steel pipe production method provided by the invention has realized the technology of " hot charging heat is sent ", confirms that by the computer art simulation compare with traditional processing technology, the present invention can save the energy more than 40%, and can reduce the scaling loss more than 1%. The present invention adopts the step-by-step movement soaking pit to replace annular furnace, so that stove system one-time investment has reduced 20%, the workshop area occupied of stove system has reduced 60%, and the iron scale that heating occurs is easy to remove. The invention enables the traditional mode of production method in steelmaking continuous casting workshop and hot-rolled pipe workshop substantially to remain unchanged, solved equipment configuration, rhythm of production and be connected the difficult problem that the aspect occurs.
Claims (4)
1. a hot continuous rolling method for producing seamless steel tube is characterized in that, comprising:
The buffering attemperator cushions under keeping warm mode deposits the continuous casting circular tube blank that the steel-making continuous casting workshop provides, and continuous casting circular tube blank is offered the step-by-step movement soaking pit;
The step-by-step movement soaking pit carries out soaking and intensification with the continuous casting circular tube blank that described buffering attemperator provides;
The continuous casting circular tube blank that the hot saw cutting device provides described step-by-step movement soaking pit carries out hot saw cuts, and obtains the scale pipe;
The scale pipe that stay-warm case provides described hot saw cutting device is incubated or heats up, and is temperature required down at punch, described scale pipe sent into described punch bore a hole.
2. method according to claim 1 is characterized in that, described buffering attemperator comprises: stepping mechanism, attemperator and temperature measuring equipment;
Described stepping mechanism adopts single step to transfer mode or multistep is transferred mode;
Described attemperator is made of the heat-insulating material that covers described continuous casting circular tube blank and stepping mechanism;
Described temperature measuring equipment provides the continuous casting circular tube blank temperature information to described step-by-step movement soaking pit, and described step-by-step movement soaking pit specifically heats up to continuous casting circular tube blank according to the continuous casting circular tube blank temperature information that described temperature measuring equipment provides.
3. method according to claim 2 is characterized in that, described attemperator comprises steel structure support and circumferentially is fixed on pottery fiber module on the described steel structure support.
4. method according to claim 1 is characterized in that, described buffering attemperator is many groups, and described many group buffering attemperators cooperatively interact, and divide degree of control to provide continuous casting circular tube blank to described step-by-step movement soaking pit to set.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772333A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Rolling method for hot rolling seamless continuous-rolled thin-walled 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 |
| CN114752746A (en) * | 2022-03-29 | 2022-07-15 | 太原重工工程技术有限公司 | Multi-mode steel pipe rolling process |
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| 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 |
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| CN114752746B (en) * | 2022-03-29 | 2023-07-21 | 太原重工工程技术有限公司 | Multi-mode steel pipe rolling process |
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