CN101439350B - Method for producing seamless steel pipe for producing gas cylinder with heavy caliber for hauled vehicle - Google Patents
Method for producing seamless steel pipe for producing gas cylinder with heavy caliber for hauled vehicle Download PDFInfo
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Abstract
The invention relates to a method for manufacturing a seamless steel pipe of a large-aperture high pressure cylinder for producing a trailer and belongs to the field of manufacturing a seamless steel pipe. The invention mainly solves the technical problem of satisfying the physical dimension precision and the quality requirements on internal and external surfaces of the seamless steel pipe of the large-aperture high pressure cylinder for the trailer at low cost. The invention adopts the technical proposal that after being perforated, a heavy-section round wave steel ingot is formed by being rolled by a step rolled mill and then drawn by a drawing aperture enlarging machine set; the tolerance of the wall thickness of a pipe blank rolled by the step rolled mill is S-8<10> percent and the extreme deviation is less than or equal to 2.5 mm; when the drawing pipe expander set is expanded and manufactured, the aperture enlargement ratio is controlled to be less than 25 percent when the pipe blank is heated each time; the aperture enlargement and the wall reduction are conducted for at most 4 times; the aperture enlargement magnitude of each time is not larger than 45 mm; and the expanding and manufacturing temperature is larger than 780 DEG C at the last expanding and manufacturing.
Description
Technical field
The present invention relates to a kind of manufacture method of producing the seamless steel pipe of gas cylinder with heavy caliber for hauled vehicle, belong to seamless steel pipe and make the field.
Background technology
In recent years, the manufacturing of gas cylinder adopts thin-wall seamless steel pipe to make from adopting steel billet to make to turn to through the punching drawing, and becomes world development trends.Vehicle CNG trailer bottle and gas station roll up with the gas cylinder demand, and the demand to the major diameter gas cylinder tube on market also increases thereupon.Seamless steel pipe for gas cylinder is except the mechanical properties such as intensity that require steel pipe meet the demands, also require lightweight, reduce unnecessary burden, therefore higher to the geometric accuracy such as the diameter of gas cylinder tube, wall thickness and surfaces externally and internally quality requirement, can produce at present the producer of gas cylinder tube seldom, cost is higher.The steel pipe of domestic this description is all from the import of Italian Da Er exposed penstock factory.Italy Da Er exposed penstock factory, blank adopts continuous casting garden base, for pipe, then adopts advanced plug expander production technology to produce this kind by the MPM limiting mandrel tandem rolling pipe machine.This advanced process equipment is the best approach of modern production major diameter, middle thin-wall seamless steel pipe.But equipment investment is huge, high cost.
Report that Jiangsu Chengde Steelpipe Co., Ltd has developed for the manufacture of gas cylinder hot rolling seamless large-diameter pipes, steel pipe trade mark 4130X, outer diameter of steel pipes (D) ∮ 559mm, permissible variation ± 1.0%; Thickness of steel pipe (S) 17.0mm, permissible variation 0～+ 25%.Jiangsu Chengde Steelpipe Co., Ltd's blank adopts continuous cast round billets to produce this kind gas cylinder steel pipe through the production technology of secondary punch.The gas cylinder steel pipe that this production technology is produced, the poor dimensional precision of product, inside and outside surface quality are poor, and product quality can not meet the demands, and need to reach by the reconditioning of surfaces externally and internally machinery.And yield poorly, production cost is high.
Gas cylinder with heavy caliber for hauled vehicle by in major diameter, the thick seamless steel pipe of thin-walled is prepared from.The seamless steel pipe diameter that uses is larger, and length is also longer, sometimes also requires wall thinner, and requiring has higher performance, therefore more be difficult to produce.In high-quality heavy caliber, the thick seamless steel pipe of thin-walled requires outer diameter of steel pipes ∮ 426～559mm, and is even larger; (2) thickness of steel pipe 10～20mm; (3) steel pipe length reaches 11.0m; (4) steel pipe will be by the ultrasonic examination of C5 equivalent in standard GB/T/T5777; (5) obdurability of steel pipe is good, has especially at low temperatures 40 ℃ of impact value 〉=40J of higher impact property; (6) yield tensile ratio≤0.85; (7) the wall thickness tolerance S of steel pipe ± 12.5%, and require horizontal, the vertical wall thickness of steel pipe even, the thickness of steel pipe precision is high.It is low that production cost need to be developed at present in this area, the preparation method of the thick seamless steel pipe of thin-walled in the major diameter of the satisfactory preparation gas cylinder with heavy caliber for hauled vehicle that the product geometric accuracy is high, the surfaces externally and internally quality is high.
Summary of the invention
It is low that the technical problem to be solved in the present invention is to provide a kind of new production cost, in the high satisfactory preparation gas cylinder with heavy caliber for hauled vehicle of product geometric accuracy, surfaces externally and internally quality, the preparation method of the thick seamless steel pipe of thin-walled.
The scheme of the method is that the perforation of large section circle wave steel ingot is rolling by 20 inches Pilger pipe mills, then forms through 100 tons of drawing type expanding machines expansion systems.Wherein, the wall thickness tolerance S of the rolling pipe of 20 inches Pilger pipe mills
-8 + 10%, extreme difference≤2.5mm.
In the inventive method, 100 tons of drawing type pipe expanding set expand when processed, adopt the mode of texturing of small deformation amount multi-pass, and total enlarging rate≤35% is guaranteed the dimensional accuracy of fished pipe; The mode of texturing of described small deformation amount multi-pass refers to the every heating of pipe once: enlarging rate is controlled at below 25%, is not more than 4 hole enlargements and subtracts wall, and each hole enlargement amount is not more than 45mm, and simultaneously last 1 expansion temperature processed must be greater than 780 ℃.
Further, the method comprises the following steps:
A, preparation steel ingot are as blank;
B, large section circle wave Heating Steel Ingots: large section circle wave steel ingot is when annular furnace heats, the spacing that steel ingot is arranged in stove is 500～700mm, burner hearth keeps little reducing atmosphere, male and female face, not saturating, the overheated or burn-off phenomenon of heating must not appear in heating, 8～11 hours heat time heating times, 1240～1270 ℃ of the steel temperature of coming out of the stove;
The online heat centering of c: the steel ingot through the annular furnace heating adopts online mechanical thermal centering, its internal point centre deviation requirement≤5mm.
The round wave steel ingot of large section after the d heating adopts Mannesmann piercing machine perforation preparation hollow billet: the hollow billet after requiring to bore a hole is visual straight, total length external diameter in the same size;
E sends hollow billet into Rolling Production pipe on 20 inches Pilger pipe mills.Wherein the tube blank size precision is wall thickness tolerance S
-8 + 10%, extreme difference≤2.5mm.
F goes to 100 tons of drawing type pipe expanding set with the pipe of producing on 20 inches Pilger pipe mills, adopts 100 tons of drawing type pipe expanding set, with the mode of texturing expansion system of small deformation amount multi-pass, total enlarging rate≤35%, guarantees the dimensional accuracy of fished pipe; The mode of texturing of described small deformation amount multi-pass refers to the every heating of pipe once, and enlarging rate is controlled at below 25%, is not more than 4 hole enlargements and subtracts wall, and each hole enlargement amount is not more than 45mm, and last expansion temperature processed must be made the final finished pipe greater than 780 ℃ of expansions.
Wherein, pipe heats at every turn and carries out in walking-beam furnace, and burner hearth keeps reducing atmosphere, homogeneous heating 40～80 minutes, 1000～1080 ℃ of heating-up temperatures.
Produce the seamless large-diameter pipes outer diameter of steel pipes ∮ 426～559mm of gas cylinder with heavy caliber for hauled vehicle described in above-mentioned manufacture method,, wall thickness 10～20mm, the wall thickness tolerance S ± 12.5mm of steel pipe.
Specifically, to produce the manufacture method of the seamless steel pipe steel pipe of heavy caliber trailer gas cylinder be to be completed by following steps in the present invention:
(1) blank: adopt the large section circle wave steel ingot steel ingot of smelting through the concise stove of LF+VD application of vacuum as blank, preferred adopt press Chinese patent 200620036533.6 " tube rolling ingot mould " in disclosed technology is cast in disclosed mould and Chinese patent application 200610022411.6 " casting method of killed steel " the round wave steel ingot of satisfactory large section.
(2) large section circle wave Heating Steel Ingots: large section circle wave steel ingot is when annular furnace heats, the spacing that steel ingot is arranged in stove is 500～700mm, burner hearth keeps little reducing atmosphere, male and female face, not saturating, the overheated or burn-off phenomenon of heating must not appear in heating, 8～11 hours heat time heating times, 1240～1270 ℃ of the steel temperature of coming out of the stove;
(3) online heat centering: the steel ingot through the annular furnace heating adopts online mechanical thermal centering, its internal point centre deviation requirement≤5mm.
(4) Mannesmann piercing machine perforation: according to different production specifications, select corresponding perforating head size, capillary outer diameter control≤640mm, the rear hollow billet length≤4m that guarantees to bore a hole, the hollow billet after requiring to bore a hole is visual straight, total length external diameter in the same size.
(5) 20 inches Pilger pipe mills: the distortion of this steel pipe is mainly completed on 20 inches Pilger pipe mills (claiming again rotary forging mill).Select rolling groove size and plug size according to rolling specs, plug length exposes 400mm after should guaranteeing to penetrate hollow billet.By suitable feed quantities of selecting factors such as rolling wall thickness, rolling temperature and rolling kinds, guarantee that wall thickness is even, the surface is without convex closure and outer folding.Pipe wall thickness tolerance S
-8 + 10%, extreme difference are controlled at≤2.5mm.The pipe geometric accuracy that this unit provides directly has influence on the geometric accuracy of fished pipe.
(6) 100 tons of pipes that the drawing type pipe expanding set provides 20 inches Pilger pipe mills, after the hydraulic pressure pipe-expanding machine expands into horn mouth with pipe end, in the whole heating of step heating-furnace, the pipe after heating (with horn mouth) is delivered to and is expanded system on 100 tons of drawing type pipe expanders.
Wherein, the selection of tube blank size: because the main feature of drawing type pipe expander flow of metal is that the pipe diameter increases, wall thickness reduction, and tube wall is when changing, according to the mobile law of minimum resistance of plastic deformation, the trend that the tube wall radial thickness changes is " thin point is thinner ", so according to the unit capacity for pipe, should provide large-sized pipe as far as possible, to reduce the enlarging rate of 100 tons of drawing type pipe expanding set, the enlarging rate that is distributed in 100 tons of drawing type pipe expanding set answers≤35%.
Enlarging rate computing formula: E=(D
2-D
1)/D
1* 100%
D in formula
1, D
2Be respectively the external diameter of expander front and back.
During expander, pipe heats in walking-beam furnace, and burner hearth keeps little reducing atmosphere, and male and female face, overheated or burn-off phenomenon must not appear in heating, 40～80 minutes heat time heating times, 1000～1080 ℃ of heating-up temperatures;
The distribution principle of drawing type pipe expanding set enlarging rate: the every heating of pipe once: enlarging rate is controlled at below 25%, is not more than 4 hole enlargements and subtracts wall, and each hole enlargement amount is not more than 45mm, last expand temperature processed must be greater than 780 ℃.Determine heating times according to the tube blank size that provides, production tube size and mentioned above principle.
(7) production tube is through vertical pressure straightener aligning → finishing → ultrasonic examination → packing warehouse-in.
It is rolling for pipe on 20 inches Pilger pipe mills that beneficial effect of the present invention is to have developed the employing steel ingot, expand again the production technology of system through 100 tons of drawing type pipe expanding set, by adopting unique manufacturing process technology, produce the high-quality major diameter that meets the demands, the thick trailer of middle thin-walled gas cylinder seamless steel pipe.The inventive method technique is simple, cost is low, and output is large, is fit to large industrial production, for this area provides a kind of new selection.
The specific embodiment
1, require steel pipe specification and the steel grade of preparation,
The steel pipe kind that embodiment of the present invention requirement prepares, specific targets see Table 1.
Table 1
Annotate: grade of steel is to adopt 4130 in ASTM A519 standard.
Nominal wall thickness: specifying and being used to design, this use is to distinguish with actual wall thickness, and actual wall thickness can be in the fluctuation up and down of nominal.
Minimum wall thickness (MINI W.): specify the minimum wall thickness (MINI W.) that is used to design, this use is to distinguish with actual wall thickness, and actual wall thickness can fluctuate more than minimum wall thickness (MINI W.).
Usually the user can adopt a kind of form in nominal wall thickness or two kinds of forms of minimum wall thickness (MINI W.) to order goods.
2, production technology:
(1) the large section circle wave steel ingot of smelting through the concise stove of LF+VD application of vacuum; See Table 2.
Table 2
| Numbering | Circle wave steel ingot (diameter mm/ ton) |
| 1 | ∮580/4.0 |
| 2 | ∮550/3.3 |
| 3 | ∮500/2.5 |
2, use the inventive method to produce steel pipe
(1) large section circle wave steel ingot: through the raw material that the concise stove of LF+VD application of vacuum is smelted use Chinese patent 200620036533.6 " tube rolling ingot mould " in disclosed mould and Chinese patent application 200610022411.6 " casting method of killed steel " disclosed technology casting meet the round wave steel ingot of large section that table 3 requires.
(2) Heating Steel Ingots: large section circle wave steel ingot is when annular furnace heats, the spacing that steel ingot is arranged in stove is 500～700mm, burner hearth keeps little reducing atmosphere, male and female face, not saturating, the overheated or burn-off phenomenon of heating must not appear in heating, 8～11 hours heat time heating times, 1240～1270 ℃ of the steel temperature of coming out of the stove;
Design parameter sees Table 3.
(3) online heat centering: the steel ingot through the annular furnace heating adopts online mechanical thermal centering, its internal point centre deviation requirement≤5mm.
(4) Mannesmann piercing machine perforation: according to different production specifications, select corresponding perforating head size, capillary outer diameter control≤640mm, rear hollow billet length≤4m guarantees to bore a hole, hollow billet after requiring to bore a hole is visual straight, total length external diameter in the same size, and design parameter sees Table 3.
(5) 20 inches Pilger pipe mills: the distortion of this steel pipe is mainly completed on 20 inches Pilger pipe mills (claiming again rotary forging mill).Select rolling groove size and plug size according to rolling specs, plug length exposes 400mm after should guaranteeing to penetrate hollow billet.By suitable feed quantities of selecting factors such as rolling wall thickness, rolling temperature and rolling kinds, guarantee that wall thickness is even, the surface is without convex closure and outer folding.Pipe wall thickness tolerance S
-8 + 10%, extreme difference are controlled at≤2.5mm.The pipe geometric accuracy that this unit provides directly has influence on the geometric accuracy of fished pipe, and rolling design parameter sees Table 3.
(6) 100 tons of drawing type pipe expanding set are made the final finished pipe with the pipe expansion of 20 inches pilgrim rolling units production.
Expansion system, heating process parameter see Table 4.
Table 4 expands technological parameter processed
| Numbering | Pipe external diameter mm | Pipe wall thickness mm | Production tube external diameter mm | Production tube wall thickness mm | Heating-up temperature ℃ | Heat time heating time (minute) | Heating times (inferior) | Rolling pass | Total enlarging rate | Hot external diameter mm |
| 1 | ∮476 | 23 | ∮559 | 19.5 | 1050～1080 | 70～80 | 1 | 4 times | 17.3％ | 564～566 |
| 2 | ∮476 | 18.7 | ∮559 | 14.1 | 1030～1060 | 60～70 | 1 | 4 times | 16.8％ | 564～566 |
| 3 | ∮426 | 15 | ∮559 | 10.3 | 1000～1040 | 40～60 | 2 | 6 times | 26.1％ | 564～566 |
(7) the production tube physical dimension sees Table 5.
The physical dimension of table 5 product
(8) the sample heat treatment performance sees Table 6.
The performance test results of table 6 sample
Above result shows: the inventive method adopts steel ingot by 20 inches pilgrim rolling unit tubulation bases, then expands system through 100 tons of drawing type pipe expanding set.Can obtain that the product geometric accuracy is high, surfaces externally and internally quality and the satisfactory major diameter trailer of mechanical property seamless steel pipe for gas cylinder, the simple cost of method is low, output is large, is fit to large industrial production.
Claims (3)
1. for the production of the manufacture method of gas cylinder with heavy caliber for hauled vehicle seamless steel pipe, it is characterized in that it is that the perforation of large section circle wave steel ingot is rolling by 20 inches Pilger pipe mills, expand system through 100 tons of drawing type hole enlargement units again and form, wherein 20 inches pipe wall thickness tolerances that Pilger pipe mill is rolling
Extreme difference≤2.5mm; 100 tons of drawing type pipe expanding set expand when processed, adopt the mode of texturing of small deformation amount multi-pass, and total enlarging rate≤35% is guaranteed the dimensional accuracy of fished pipe; The mode of texturing of described small deformation amount multi-pass refers to the every heating of pipe once: enlarging rate is controlled at below 25%, is not more than 4 hole enlargements and subtracts wall, and each hole enlargement amount is not more than 45mm, and simultaneously last 1 expansion temperature processed must be greater than 780 ℃.
2. the manufacture method of production gas cylinder with heavy caliber for hauled vehicle seamless steel pipe according to claim 1 is characterized in that comprising the following steps:
A, the satisfactory large section circle wave steel ingot of preparation;
B, large section circle wave Heating Steel Ingots: large section circle wave steel ingot is when annular furnace heats, the spacing that steel ingot is arranged in stove is 500～700mm, burner hearth keeps little reducing atmosphere, male and female face, not saturating, the overheated or burn-off phenomenon of heating must not appear in heating, 8～11 hours heat time heating times, 1240～1270 ℃ of the steel temperature of coming out of the stove;
C, online heat centering: the steel ingot through the annular furnace heating adopts online mechanical thermal centering, its internal point centre deviation requirement≤5mm;
The round wave steel ingot of large section after d, heating adopts Mannesmann piercing machine perforation preparation hollow billet: the hollow billet after requiring to bore a hole is visual straight, total length external diameter in the same size;
E, hollow billet is sent on 20 inches Pilger pipe mills produced pipe; Wherein the tube blank size precision is wall thickness tolerance
Extreme difference≤2.5mm;
F, with the drawing type pipe expanding set, pipe is expanded and make the final finished pipe: after the hydraulic pressure pipe-expanding machine expands into horn mouth with the pipe pipe end, in the whole heating of step heating-furnace, pipe after heating is delivered to and is expanded system on 100 tons of drawing type pipe expanders, mode of texturing with small deformation amount multi-pass expands system, total enlarging rate≤35% is guaranteed the dimensional accuracy of fished pipe; The mode of texturing of described small deformation amount multi-pass refers to the every heating of pipe once: enlarging rate is controlled at below 25%, is not more than 4 hole enlargements and subtracts wall, and each hole enlargement amount is not more than 45mm, and last expansion temperature processed must be greater than 780 ℃ simultaneously; Wherein, pipe heats at every turn and carries out in walking-beam furnace, and burner hearth keeps reducing atmosphere, homogeneous heating 40～80 minutes, 1000～1080 ℃ of heating-up temperatures.
3. the manufacture method of production gas cylinder with heavy caliber for hauled vehicle seamless steel pipe according to claim 1, it is characterized in that: described production gas cylinder with heavy caliber for hauled vehicle seamless steel pipe external diameter ∮ 426～559mm, wall thickness 10～20mm, the wall thickness tolerance S of steel pipe ± 12.5%.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101631402B (en) * | 2009-07-25 | 2011-08-10 | 衡阳鸿大特种钢管有限公司 | Multi-section medium frequency heating method for pipe expanding set and device thereof |
| CN101786112B (en) * | 2010-01-21 | 2012-02-01 | 四川安吉精密管业制造有限公司 | Manufacturing method of gas cylinder steel tube for long-tube trailer |
| CN102069104A (en) * | 2010-11-30 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode |
| CN102873512B (en) * | 2012-09-29 | 2015-08-26 | 攀钢集团成都钢钒有限公司 | The manufacture method of thick-walled seamless steel pipes in used in nuclear power station heavy caliber |
| CN102974979B (en) * | 2012-11-26 | 2016-08-31 | 衡阳华菱钢管有限公司 | A kind of method using steel ingot big diameter-reducing formation die blank |
| CN103978063B (en) * | 2014-04-24 | 2016-03-09 | 佛山晓世科技服务有限公司 | Dissimilar metal tubing and its preparation method and application |
| CN104438336A (en) * | 2014-12-06 | 2015-03-25 | 常熟市东鑫钢管有限公司 | Rolling method for 35CrMo ultra-thick wall seamless steel pipe |
| CN105710147B (en) * | 2016-02-05 | 2017-11-10 | 攀钢集团成都钢钒有限公司 | Drawing type expands the production method of super-large diameter J55 sleeve pipes processed |
| CN105834217A (en) * | 2016-03-25 | 2016-08-10 | 江苏武进不锈股份有限公司 | Preparation process of large-diameter duplex stainless steel seamless steel tube and application to oceanographic engineering |
| CN105921524B (en) * | 2016-05-11 | 2017-08-25 | 天津钢管集团股份有限公司 | Controlled rolling method in seamless pipe course of hot rolling |
| CN106339560B (en) * | 2016-08-31 | 2019-05-10 | 凯迈（洛阳）气源有限公司 | A kind of high pressure gas cylinder wall thickness Parameters design and forming method |
| CN110788141B (en) * | 2019-10-24 | 2021-10-15 | 衡阳华菱钢管有限公司 | Seamless steel tube, manufacturing method and high-pressure gas cylinder thereof |
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