CN101791627A - Method for rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander - Google Patents
Method for rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander Download PDFInfo
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- CN101791627A CN101791627A CN200910229079.4A CN200910229079A CN101791627A CN 101791627 A CN101791627 A CN 101791627A CN 200910229079 A CN200910229079 A CN 200910229079A CN 101791627 A CN101791627 A CN 101791627A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000005096 rolling process Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000004513 sizing Methods 0.000 claims abstract description 9
- 238000003303 reheating Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 239000002184 metal Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 8
- 230000001050 lubricating effect Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 6
- 238000003801 milling Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
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Abstract
The invention provides a method for rolling a large-caliber seamless steel tube by using a disc roller rotary-rolling pipe expander. The method is performed in four independent areas comprising a foreground, a host, a background section I and a background section II, wherein the four areas are connected to form a disc roller rotary-rolling pipe expander set area. The method comprises the following steps: charging blank tubes, heating in a step furnace, disc roller pipe expansion, flatting a tapered roller, reheating in the step furnace, sizing, finishing and warehousing. The method has the advantages that a product rolled by the disc roller rotary-rolling pipe expander has good surface quality, and the steel tube has uniform metal texture and high dimensional precision. The wall thickness precision of the steel tube can reach +/-8 percent, the production efficiency is high, and the metal consumption is low. The method is advanced, and the deformation of the rotary-rolling pipe expansion mode is complex compared with other several pipe expansion modes; and the yield of the rolled product is high, and the annual yield of the rotary-rolling pipe expansion mode is much higher than that of the other several pipe expansion modes. The expanding specification range of the disc roller rotary-rolling pipe expander can reach phi 506 to 740 * 9.5 to 32mm. The specification range of the finished product can reach 508 to 711.2 * 9.5 to 32mm.
Description
Technical field
The present invention relates to a kind of method of rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander.
Background technology
The expander mode of using in the world mainly contains drawing formula expander, pushing formula expander and revolves and rolls three kinds of modes of production of expander at present.Preceding two kinds of expander modes are owing to be subjected to the restriction of stress and deformation state, the trickle defective of tube surfaces enlarges, easily crack and interior straight way, external diameter, wall thickness deviation and flexibility all will become greatly, and dimensional accuracy, the surface quality of producing steel pipe are good not as good as revolving the mode of rolling expander.The drawing formula is revolved Rolling pipe expander and is also had that lumber recovery is low, production efficiency is low and the high shortcoming of tool expense.Present many countries generally all no longer build drawing process and carry out expander production.
According to statistics, have 6 drawing formula pipe expanders in the world at present, wherein Italy is 2,2 in France, 1 in Venezuela, 1 in Argentina.After 1 of France is installed in Φ 400 automatic tube rolling mills, all the other 5 all are configured in after the pilger mill.Production capacity is generally 30,000 tons/year.Because drawing formula pipe expanding method production efficiency is low, metal consumption is big, and product quality is not good, is not further developed.
In recent years, the pushing diameter expansion method helps improving the inherence and the presentation quality of steel pipe, progressively apply in China at present, but that its production technology still need be improved is perfect.
Novel roll-type diagonal rolling expanding pipe product surface quality is good, and the steel pipe metal structure is even, the dimensional accuracy height.Than other several large-diameter steel pipe mode of production production efficiency height, metal consumption is little simultaneously.Above-mentioned advantage has made novel roll-type expander technology become current a kind of economy production technology of heavy caliber seamless steel pipe flexibly.
Summary of the invention
The invention provides a kind of method of rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander, purpose is to improve steel pipe surfaces externally and internally quality, raising steel pipe mechanical performance, physicochemical property, raising steel pipe sizes precision, the yield in unit time that improves, minimizing metal consumption.
For achieving the above object, technical solution of the present invention provides a kind of method of rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander, this method is to include foreground, main frame, one section on backstage, two sections four distinct area in backstage, and four zones are connected to become disc-type roller by conveyor roller revolve that Rolling pipe expander group zone carries out, this method may further comprise the steps:
1. base pipe material loading
With the effective overhead traveling crane handling of former material base to the material loading stand;
2. walking-beam furnace heating
Deliver in the heating furnace by roller-way through step former material base pipe 1. and to heat, heating-up temperature is 1150～1200 ℃, be heated to the temperature that needs after, former material base pipe is said heating furnace from the transport roller of coming out of the stove;
3. disc-type roller expander
2. heat the former material base pipe of finishing is transported to disc-type roller by the conveyor roller of coming out of the stove and revolves Rolling pipe expander group zone through step, after the outer surface iron scale is removed through water under high pressure in the foreground, delivering to disc-type roller by conveyor roller revolves Rolling pipe expander main frame place and is rolled, in the operation of rolling, outer diameter of steel pipes increases gradually, wall thickness reduces gradually, and the steel pipe of finishing after rolling advances to one section on backstage; The retaining pipe device that is fixed between two sections on one section on backstage and the backstage blocks the base pipe, make the base pipe rest on one section zone, backstage, in this process, the push rod that inserts in the steel pipe then retreats with the base pipe, push rod retreats to the backstage two sections, the stirring arm is routed up roll line to conveyor roller with the base pipe, is transported to subsequent processing and is rolled;
4. tapered roller expansion
Enter tapered roller expansion unit through step steel pipe 3. and carry out expansion, improve the inside and outside surface quality of steel pipe, improve wall thickness accuracy;
5. walking-beam furnace heats again
, then enter the step-by-step movement reheating furnace and heat if need to mend temperature or online normalizing through step steel pipe 4., temperature is at 700～1000 ℃;
6. sizing
Improve the outer surface of steel tube quality through step steel pipe 5. by the sizing operation, improve the external diameter precision, finish after this operation steel pipe and be transported to cold bed through roller-way and be cooled to room temperature;
7. finishing procedure: the steel pipe that is cooled to room temperature carries out finishing operations such as sawing, flaw detection, hydraulic pressure, spray mark, check in the finishing operation area;
8. put in storage: after finishing above-mentioned operation, qualified steel pipe is handled the warehouse-in formality, goes into warehouse for finished product.
The invention has the beneficial effects as follows:
1, to revolve the Rolling pipe expander product surface quality good for disc-type roller, and the steel pipe metal structure is even, the dimensional accuracy height.The thickness of steel pipe precision can reach ± and 8%, the production efficiency height, metal consumption is little.
2, technology advanced person is revolved and is rolled the expander mode and be out of shape than other several expander modes and all want complicated;
3, output height revolves and rolls the annual production of expander mode far above other several expander modes.This disc-type roller revolves Rolling pipe expander hole enlargement specification limit can reach Φ 506～740 * 9.5～32mm.The trimmed size scope can reach 508～711.2 * 9.5～32mm.
Description of drawings
Fig. 1 revolves Rolling pipe expander group structural representation for disc-type roller of the present invention;
Fig. 2 is the Rolling pipe expander technological process of production figure that revolves of the present invention.
Among the figure:
1, foreground 2, main frame 3, one section 4 on backstage, two sections on backstage
The specific embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated the method for rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander of the present invention.
The method of rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander of the present invention, this method is to include foreground 1, main frame 2, one section 3 on backstage, two sections 4 four distinct area in backstage, and four zones are connected to become disc-type roller by conveyor roller revolve that Rolling pipe expander group zone carries out, this method may further comprise the steps: 1. base pipe material loading
With the effective overhead traveling crane handling of former material base to the material loading stand;
2. walking-beam furnace heating
Deliver in the heating furnace by roller-way through step former material base pipe 1. and to heat, heating-up temperature is 1150～1200 ℃, be heated to the temperature that needs after, former material base pipe is said heating furnace from the transport roller of coming out of the stove;
3. disc-type roller expander
2. heat the former material base pipe of finishing is transported to disc-type roller by the conveyor roller of coming out of the stove and revolves Rolling pipe expander group zone through step, after the outer surface iron scale is removed through water under high pressure in foreground 1, delivering to disc-type roller by conveyor roller revolves Rolling pipe expander main frame 2 places and is rolled, in the operation of rolling, outer diameter of steel pipes increases gradually, wall thickness reduces gradually, and the steel pipe of finishing after rolling advances to the backstage one section 3; Retaining pipe device between two section 4 on be fixed on the backstage one section 3 and the backstage blocks the base pipe, make the base pipe rest on one section 3 zone, backstage, in this process, the push rod that inserts in the steel pipe then retreats with the base pipe, push rod retreats to the backstage two section 4, the stirring arm is routed up roll line to conveyor roller with steel pipe, is transported to subsequent processing and is rolled;
4. tapered roller expansion
Enter tapered roller expansion unit through step steel pipe 3. and carry out expansion, improve the inside and outside surface quality of steel pipe, improve wall thickness accuracy;
5. walking-beam furnace heats again
, then enter the step-by-step movement reheating furnace and heat if need to mend temperature or online normalizing through step steel pipe 4., temperature is at 700～1000 ℃;
6. sizing
Improve the outer surface of steel tube quality through step steel pipe 5. by the sizing operation, improve the external diameter precision, finish after this operation steel pipe and be transported to cold bed through roller-way and be cooled to room temperature;
7. finishing procedure: the steel pipe that is cooled to room temperature carries out finishing operations such as sawing, flaw detection, hydraulic pressure, spray mark, check in the finishing operation area;
8. put in storage: after finishing above-mentioned operation, qualified steel pipe is handled the warehouse-in formality, goes into warehouse for finished product.
Adopting the heavy caliber seamless steel pipe specification limit of the rolling is Φ 508～711.2mm * 9.5～32mm * 6～12m.
The method of rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander of the present invention is such realization
, rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander disc-type roller revolve the Rolling pipe expander basic device structure and move as follows:
1, foreground
The foreground by rise and fall roller, blow tank, buckle watt device, inlet guide pin bushing, base etc. and form.
1) rise and fall roller
The height of operating position can make the axis and the roll line of all size base pipe align by the motor adjustment like this, is beneficial to and nips.
2) blow tank
According to the supplied materials specification, blow tank has four kinds of specifications.Both support the base pipe in the operation of rolling, protected roller-way again.With outer water spray cooling.
3) button watt device
Button watt device is locked on the base of blow tank admittedly, is buckled in the blow tank top.The rotation of base pipe tail end throws away blow tank when preventing the oblique milling expander.
4) inlet guide pin bushing
Guiding base pipe is nipped.
5) base
The weight of base support foreground all devices plays the effect of permanent plant.
2, main frame
Main frame 2 is made up of roll, roll adjusting device, upper guide plate device, bottom guide device and base etc.
1) roll
Arrange about two rolls of diagonal rolling expanding pipe, transmission separately, guide plate is arranged up and down.Two roll center lines lay respectively at roll line and respectively differ up and down in two horizontal planes of 80mm; The adjustment of height cushion block, mechanical interlocking.Left and right sides roll can be realized electronic compress into adjustment, locking.Two overlapped in the roll-boxes the independent transmission of outlet side about two roll devices were contained in.Realize the adjustment of axial location of roll and fixing by being contained in roll adjusting device on each roll-box.Roll adopts outer water spray cooling.
2) roll adjusting device
Every cover roll adjusting device is made up of a reducing motor, two commutators, two spiral lifts and shaft coupling etc.Every cover roll-box is fastening by bolt and frame.Two cover roll-boxes link to each other with the loam cake of frame by the hydraulic cylinder linkage, and locking.By the hydraulic cylinder linkage, loam cake is rotatable to be opened, and conveniently changes roll.
3) upper and lower guide plate
Upper and lower guide plate arrangement is arranged vertically, upper guide plate device vertical direction, the electronic adjustment of horizontal direction, hydro-cushion.Bottom guide device vertical direction pad is adjusted, the electronic adjustment of horizontal direction, hydro-cushion.Two wedges of upper guide plate device under the hydraulic cylinder effect, rotatable opening, the upper guide plate seat can hang out from frame, is convenient for changing upper and lower guide plate.Rack is made up of loam cake, base and retaining mechanism etc.Guide plate adopts outer water spray cooling.
4) top, push rod
The top is fixed on the push rod leading portion when the oblique milling expander is rolling, put in the middle of two rolls and two guide plates by top rod driving, forms an annular deformed area.After rolling end, the top returns to push rod that the clamping device in exit is held behind the oblique milling expander main frame, and separates with push rod, carrying out outer water spray cooling.Push rod returns to the backstage by ejector rob trolley provided driving and carries out inside and outside water-cooled for two sections.
3, the backstage is one section
One section 3 on backstage is made up of a cover top cooling and lubricating device, five three-roller guiding devices, a cover rise and fall roller, poking device, base etc.
1) top cooling and lubricating device
The top cooling and lubricating device is made up of hydraulic cylinder linkage, gear synchronization mechanism.Can carry out online cooling and lubricated to the top.The top cooling and lubricating device is arranged in the diagonal rolling expanding pipe outlet side.After each oblique milling expander was rolling, the top returned to this and is blocked by clamp, cools off and graphite lubrication.When oblique milling expander next time, push rod pierces into the center, top, penetrate the back push rod top is pushed milling train in the middle of (between roll and the guide plate) carry out rolling next time.
2) three-roller guiding devices
Five three-roller guiding devices are arranged for one section 3 in whole backstage.Three-roller guiding devices adopts the quadric chain form, realizes the opening degree adjustment with the position of displacement transducer control hydraulic cylinder.The one section three-roller guiding devices in backstage can realize embracing push rod, steel pipe leads, embraces a roller and opens three stations.Three-roller guiding devices is embraced push rod earlier, can guarantee that the push rod center line is consistent with roll line, and can strengthen the rigidity of push rod, in the time of before the steel pipe that shuts out arrives first three-roller guiding devices, hot metal detector has detected material back sender, the hydraulic cylinder action of three-roller guiding devices, three guide rollers are opened to certain position, make and form an annular space between itself and push rod, like this, steel pipe advances along the roll line direction by this annular space under the guiding of these three guide rollers.In the time of before steel pipe arrives second three-roller guiding devices, hot metal detector has detected material back sender, and second action is identical.And the like.After rolling end, the one section rise and fall roller in backstage rises to arrive supports the steel pipe position, the hydraulic cylinder action of three three-roller guiding devices, and the guide roller top roll is opened, and the two sections blocking devices in backstage are opened, and ejector rob trolley provided transmission device starts, and drives push rod and steel pipe and retreats.The top arrives cooling and lubricating device place, one section top, backstage, throws off between top and the push rod, and the top stays cooling and lubricating, and push rod and steel pipe continue to retreat under ejector rob trolley provided effect.After steel pipe was blocked at retaining pipe device place, push rod was extracted out from steel pipe, and poking device starts transfers to roll line with steel pipe.Poking device turns back to extreme lower position, and rise and fall roller rises the jacking bar, and ejector rob trolley provided drive push rod advances to cooling and lubricating device place, top fast, the good top of cooling and lubricating is installed after, advance to the operating position.Push rod is embraced in the one section three-roller guiding devices hydraulic cylinder action in backstage.The action of rise and fall roller hydraulic cylinder drops to lowest order.The two sections blocking device hydraulic cylinder actions in backstage are locked ejector rob trolley provided.Enter the rolling working cycles of next root steel pipe.
3) rise and fall roller
The rise and fall roller integral elevating, transmission separately.Rise and fall roller can have two stations, and when steel pipe passed through one section, rise and fall roller dropped to low level and holds steel pipe; When having only push rod to pass through, rise and fall roller is raised to the high-order push rod that supports.
4) poking device
Poking device adopts the Driven by Hydraulic Cylinder leverage.
4, the backstage is two sections
Two section 4 on backstage is made up of retaining pipe device, blocking device, ejector rob trolley provided, the little storehouse of hydraulic pressure, push rod supported cart, dolly main transmission, push rod and track-type facilities etc.
Blocking device adopts the buffer location, and the locking of hydraulic cylinder linkage is ejector rob trolley provided.The blocking device axial device can realize online by the little storehouse of hydraulic pressure and line is adjusted outward.Ejector rob trolley providedly form by little car body, hollow shaft, thrust bearing, wheel etc.The little storehouse of hydraulic pressure can change top head front-extending quantity by regulating the little storehouse of hydraulic pressure elongation.The push rod supported cart is positioned at the two sections front ends in backstage, plays the effect of supporting push rod.Steel wire rope, reel driving mechanism are adopted in dolly main transmission.Track-type facilities supports ejector rob trolley provided so that ejector rob trolley provided mobile in the above.
5, main transmission
Main transmission is made up of main motor, reductor, shaft coupling and base.
Motor adopts two variable-frequency motors, and reductor adopts hardened face gear, and is lubricated separately.Shaft coupling adopts drum Gear Couplings'.The weight of each parts of base support plays the effect of stabilizing equipment.
Two, heavy caliber seamless steel pipe production instance:
Be that the example explanation is revolved and rolled the expander technological process of production to produce Φ 508 * 13 high pressure chemical fertilizer pipes below:
1. base pipe material loading:
Former material base pipe specification Φ 377 * 21mm, the effective overhead traveling crane of former material base is hung oneself from the raw material stand and is transported on the feeding skid;
2. walking-beam furnace heating
Deliver in the heating furnace by roller-way through step former material base pipe 1. and to heat, heating-up temperature is 1170 ± 10 ℃, and stepping rhythm is 150 seconds, and the former material base pipe after the heating is come out of the stove from furnace delivery table;
3. disc-type roller expander
2. heat the former material base pipe of finishing is transported to disc-type roller by furnace delivery table and revolves Rolling pipe expander group zone through step, after the outer surface iron scale is removed through water under high pressure in foreground 1, delivering to disc-type roller by roller-way revolves Rolling pipe expander main frame 2 places and is rolled, in the operation of rolling, outer diameter of steel pipes increases, wall thickness reduces, and the steel pipe of finishing after rolling advances to the backstage one section 3 with being installed on ejector rob trolley provided; Be fixed on one section 3 the retaining pipe device in backstage and block steel pipe with two section 4 quality inspection in backstage, make steel pipe rest on one section zone, backstage, push rod continues to retreat to the backstage two section 4 with ejector rob trolley provided, and steel pipe is routed up roll line to conveyor roller through the stirring arm, is transported to subsequent processing and is rolled; In the operation of rolling, revolving the Rolling pipe expander group mainly is to select suitable rolling tool, controls the roll shop building distance simultaneously, goes up bottom guide spacing, push rod position, roll rotational speed Several Parameters, in this time rolling, roll spacing 345mm, lead 545mm, front-extending quantity 68mm, rotating speed 300rpm.
4. tapered roller expansion
Enter tapered roller expansion unit through step steel pipe 3. and carry out expansion, improve inside and outside surface quality, improve wall thickness accuracy;
5. walking-beam furnace heats again
Entering walking-beam furnace through step steel pipe 4. according to arts demand heats and carries out online normalized treatment.Walking-beam furnace again heating-up temperature usually at 920 ± 10 ℃;
6. sizing
Improve outer surface quality through step steel pipe 5. by the sizing operation, improve the external diameter precision.Finishing after this operation steel pipe is transported to cold bed through roller-way and cools off;
7. finishing procedure: at this kind steel grade, specification, in conjunction with customer requirement, finishing procedure comprises saw
Cut, flaw detection, hydraulic pressure, survey grow, weigh, spray mark;
8. put in storage: after finishing above-mentioned operation, qualified steel pipe is handled the warehouse-in formality, goes into warehouse for finished product.
Claims (2)
1. the method for a rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander, this method is to include foreground (1), main frame (2), backstage one section (3), two section (4) four distinct area in backstage, and four zones are connected to become disc-type roller by conveyor roller revolve that Rolling pipe expander group zone carries out, this method may further comprise the steps:
1. base pipe material loading
With the effective overhead traveling crane handling of former material base to the material loading stand;
2. walking-beam furnace heating
Deliver in the heating furnace by roller-way through step former material base pipe 1. and to heat, heating-up temperature is 1150～1200 ℃, be heated to the temperature that needs after, former material base pipe is said heating furnace from the transport roller of coming out of the stove;
3. disc-type roller expander
2. heat the former material base pipe of finishing is transported to disc-type roller by the conveyor roller of coming out of the stove and revolves Rolling pipe expander group zone through step, after foreground (1) removes the outer surface iron scale through water under high pressure, delivering to disc-type roller by conveyor roller revolves Rolling pipe expander main frame (2) and locates to be rolled, in the operation of rolling, outer diameter of steel pipes increases gradually, wall thickness reduces gradually, and the steel pipe of finishing after rolling advances to one section on backstage (3); The retaining pipe device that is fixed between backstage one section (3) and the backstage two sections (4) blocks the base pipe, make the base pipe rest on one section (3) zone, backstage, in this process, the push rod that inserts in the steel pipe then retreats with the base pipe, push rod retreats to the backstage two sections (4), the stirring arm is routed up roll line to conveyor roller with steel pipe, is transported to subsequent processing and is rolled;
4. tapered roller expansion
Enter tapered roller expansion unit through step steel pipe 3. and carry out expansion, improve the inside and outside surface quality of steel pipe, improve wall thickness accuracy;
5. walking-beam furnace heats again
, then enter the step-by-step movement reheating furnace and heat if need to mend temperature or online normalizing through step steel pipe 4., temperature is at 700～1000 ℃;
6. sizing
Improve the outer surface of steel tube quality through step steel pipe 5. by the sizing operation, improve the external diameter precision, finish after this operation steel pipe and be transported to cold bed through roller-way and be cooled to room temperature;
7. finishing procedure: the steel pipe that is cooled to room temperature carries out finishing operations such as sawing, flaw detection, hydraulic pressure, spray mark, check in the finishing operation area;
8. put in storage: after finishing above-mentioned operation, qualified steel pipe is handled the warehouse-in formality, goes into warehouse for finished product.
2. the method for rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander according to claim 1 is characterized in that: adopting the heavy caliber seamless steel pipe specification limit of the rolling is Φ 508～711.2mm * 9.5～32mm * 6～12m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910229079.4A CN101791627A (en) | 2009-12-10 | 2009-12-10 | Method for rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910229079.4A CN101791627A (en) | 2009-12-10 | 2009-12-10 | Method for rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander |
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| Publication Number | Publication Date |
|---|---|
| CN101791627A true CN101791627A (en) | 2010-08-04 |
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|---|---|---|---|
| CN200910229079.4A Pending CN101791627A (en) | 2009-12-10 | 2009-12-10 | Method for rolling large-caliber seamless steel tube by using disc roller rotary-rolling pipe expander |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148489A (en) * | 2014-08-07 | 2014-11-19 | 北京京诚之星科技开发有限公司 | Method and system for producing large-diameter medium-and-thin-wall seamless steel tube |
| CN112718868A (en) * | 2020-12-10 | 2021-04-30 | 太原重工股份有限公司 | System and process for eliminating pockmarks on inner surface of hot rotary expansion steel pipe |
-
2009
- 2009-12-10 CN CN200910229079.4A patent/CN101791627A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148489A (en) * | 2014-08-07 | 2014-11-19 | 北京京诚之星科技开发有限公司 | Method and system for producing large-diameter medium-and-thin-wall seamless steel tube |
| CN112718868A (en) * | 2020-12-10 | 2021-04-30 | 太原重工股份有限公司 | System and process for eliminating pockmarks on inner surface of hot rotary expansion steel pipe |
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