CN101439350A - 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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- CN101439350A CN101439350A CNA2008103063897A CN200810306389A CN101439350A CN 101439350 A CN101439350 A CN 101439350A CN A2008103063897 A CNA2008103063897 A CN A2008103063897A CN 200810306389 A CN200810306389 A CN 200810306389A CN 101439350 A CN101439350 A CN 101439350A
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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 the market also increases thereupon.Gas cylinder with seamless steel pipe except the mechanical properties such as intensity that require steel pipe meet the demands, also require in light weight, reduce unnecessary burden, therefore higher to geometric accuracy such as the diameter of gas cylinder tube, wall thickness and surfaces externally and internally quality requirement, the producer that can produce gas cylinder tube at present 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, adopts advanced plug expander production technology to produce this kind by MPM retained mandrel tandem rolling tube machine again.This advanced process equipment is the best approach of modern production major diameter, middle thin-wall seamless steel pipe.But equipment investment is huge, and cost is too high.
Reporting that Jiangsu Chengde Steelpipe Co., Ltd has developed is used to make 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, poor, the inside and outside surface quality of dimensional accuracy of products is poor, and product quality can not meet the demands, and need reach by the reconditioning of surfaces externally and internally machinery.And yield poorly, the production cost height.
Gas cylinder with heavy caliber for hauled vehicle by in the major diameter, the thick seamless steel pipe of thin-walled is prepared from.Employed seamless steel pipe diameter is bigger, and length is also longer, also requires wall thinner sometimes, and requiring has higher performance, so more be difficult to produce.In the high-quality heavy caliber, the thick seamless steel pipe of thin-walled requires outer diameter of steel pipes ∮ 426～559mm, and is even bigger; (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 among standard GB/T5777; (5) obdurability of steel pipe is good, has higher impact property-40 ℃ impact value 〉=40J especially at low temperatures; (6) yield tensile ratio≤0.85; (7) wall thickness tolerance S ± 12.5% of steel pipe, and require the steel pipe horizontal stroke, vertically wall thickness is even, thickness of steel pipe precision height.It is low that production cost need be developed at present in this area, the preparation method of the thick seamless steel pipe of thin-walled in the major diameter of product geometric accuracy height, satisfactory preparation gas cylinder with heavy caliber for hauled vehicle that 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 provides 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 this method is with the steel ingot perforation of big section circle wave after 20 inches Pilger mill millings expand system through 100 tons of drawing formula expanding machines again and form.Wherein, the wall thickness tolerance of the pipe of 20 inches Pilger mill millings
Extreme difference≤2.5mm.
When 100 tons of drawing formula pipe expanding set expand system in the inventive method, adopt the mode of texturing of small deformation amount multi-pass, total enlarging rate≤35% is guaranteed the dimensional accuracy of fished pipe; The mode of texturing of described small deformation amount multi-pass is meant 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 system temperature must be greater than 780 ℃.
Further, this method may further comprise the steps:
A, preparation steel ingot are as blank;
B, the heating of big section circle wave steel ingot: big 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 the centering of online machinery heat, its internal point centre deviation requirement≤5mm.
The round wave steel ingot of big 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, and total length external diameter size is consistent;
E sends hollow billet into Rolling Production pipe on 20 inches Pilger milling trains.Wherein the tube blank size precision is a wall thickness tolerance
, extreme difference≤2.5mm.
F goes to 100 tons of drawing formula pipe expanding set with the pipe of producing on 20 inches Pilger milling trains, adopts 100 tons of drawing formula 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 is meant 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 the last system temperature that expands 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, evenly heats 1000～1080 ℃ of heating-up temperatures 40～80 minutes.
Produce the seamless large-diameter pipes outer diameter of steel pipes ∮ 426～559mm of gas cylinder with heavy caliber for hauled vehicle described in the 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 finished by following steps in the present invention:
(1) blank: adopt the big 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 the Chinese patent application 200610022411.6 " casting method of killed steel " the round wave steel ingot of satisfactory big section.
(2) big section circle wave steel ingot heating: big 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 the centering of online machinery heat, 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 back hollow billet length≤4m that guarantees to bore a hole, the hollow billet after requiring to bore a hole is visual straight, and total length external diameter size is consistent.
(5) 20 inches Pilger milling trains: the distortion of this steel pipe is mainly finished on 20 inches Pilger milling trains (claiming rotary forging mill again).Select rolling groove size and plug size according to rolling specs, plug length is exposed 400mm after should guaranteeing to penetrate hollow billet.Select suitable feed quantity by factors such as rolling wall thickness, rolling temperature and rolling kinds, guarantee that wall thickness is even, no convex closure in surface and outer folding.The pipe wall thickness tolerance
Extreme difference is 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 drawing formula pipe expanding set provides 20 inches Pilger milling trains, after the hydraulic pressure pipe-expanding machine expanded into horn mouth with pipe end, in the whole heating of step heating-furnace, the pipe after the heating (having had horn mouth) was delivered to and is expanded system on 100 tons of drawing formula pipe expanders.
Wherein, the selection of tube blank size: because the main feature of drawing formula 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 thin more ", 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 formula pipe expanding set, the enlarging rate that is distributed in 100 tons of drawing formula pipe expanding set answers≤35%.
Enlarging rate computing formula: E=(D
2-D
1)/D
1* 100%
D in the 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 formula 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 the system temperature must be greater than 780 ℃.Determine the heating number of times according to the tube blank size that is provided, 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 milling trains that beneficial effect of the present invention is to have developed the employing steel ingot, expand the production technology of system again through 100 tons of drawing formula pipe expanding set, by adopting the 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 technology is simple, cost is low, and output is big, is fit to big industrial production, for this area provides a kind of new selection.
The specific embodiment
1, require the steel pipe specification and the steel grade of preparation,
The steel pipe kind that embodiment of the invention requirement prepares, specific targets see Table 1.
Table 1
Annotate: grade of steel is to adopt 4130 in the ASTM A519 standard.
Nominal wall thickness: it is other with actual wall thickness phase region specifying and being used to design, this use, 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 other with actual wall thickness phase region, 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 big 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) big 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 the Chinese patent application 200610022411.6 " casting method of killed steel " disclosed technology casting meet the round wave steel ingot of big section that table 3 requires.
(2) steel ingot heating: big 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;
Concrete parameter sees Table 3.
(3) online heat centering: the steel ingot through the annular furnace heating adopts the centering of online machinery heat, its internal point centre deviation requirement≤5mm.
(4) Mannesmann piercing machine perforation:, select corresponding perforating head size, capillary outer diameter control≤640mm according to different production specifications, back hollow billet length≤4m guarantees to bore a hole, hollow billet after requiring to bore a hole is visual straight, and total length external diameter size is consistent, and concrete parameter sees Table 3.
(5) 20 inches Pilger milling trains: the distortion of this steel pipe is mainly finished on 20 inches Pilger milling trains (claiming rotary forging mill again).Select rolling groove size and plug size according to rolling specs, plug length is exposed 400mm after should guaranteeing to penetrate hollow billet.Select suitable feed quantity by factors such as rolling wall thickness, rolling temperature and rolling kinds, guarantee that wall thickness is even, no convex closure in surface and outer folding.The pipe wall thickness tolerance
Extreme difference is controlled at≤2.5mm.The pipe geometric accuracy that this unit provides directly has influence on the geometric accuracy of fished pipe, and rolling concrete parameter sees Table 3.
(6) 100 tons of drawing formula 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 the system technological parameter
| 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 number of 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, expands system through 100 tons of drawing formula pipe expanding set again.Can obtain product geometric accuracy height, surfaces externally and internally quality and the satisfactory major diameter trailer of mechanical property gas cylinder seamless steel pipe, the simple cost of method is low, and output is big, is fit to big industrial production.
Claims (4)
- [claim 1] is used to produce the manufacture method of gas cylinder with heavy caliber for hauled vehicle seamless steel pipe, it is characterized in that it is after 20 inches Pilger mill millings with the perforation of big section circle wave steel ingot, expand system through 100 tons of drawing formula hole enlargement units again and form, wherein the pipe wall thickness tolerance of 20 inches Pilger mill millings, extreme difference≤2.5mm.
- [claim 2] manufacture method that is used to produce the gas cylinder with heavy caliber for hauled vehicle seamless steel pipe according to claim 1, it is characterized in that: when 100 tons of drawing formula pipe expanding set expand system, adopt the mode of texturing of small deformation amount multi-pass, total enlarging rate≤35% is guaranteed the dimensional accuracy of fished pipe; The mode of texturing of described small deformation amount multi-pass is meant 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 system temperature must be greater than 780 ℃.
- The production method of [claim 3] gas cylinder with heavy caliber for hauled vehicle seamless steel pipe according to claim 2 is characterized in that may further comprise the steps:A, the satisfactory big section circle wave steel ingot of preparation;B, the heating of big section circle wave steel ingot: big 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 the centering of online machinery heat, its internal point centre deviation requirement≤5mm;The round wave steel ingot of big 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, and total length external diameter size is consistent;E sends into hollow billet on 20 inches Pilger milling trains and produces pipe.Wherein the tube blank size precision is a wall thickness tolerance, extreme difference≤2.5mm;
F makes the final finished pipe with drawing formula pipe expanding set with the pipe expansion: 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 the heating is delivered to and is expanded system on 100 tons of drawing formula 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 is meant 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 simultaneously expansion system temperature must be greater than 780 ℃; Wherein, pipe heats at every turn and carries out in walking-beam furnace, and burner hearth keeps reducing atmosphere, evenly heats 1000～1080 ℃ of heating-up temperatures 40～80 minutes. - The manufacture method of [claim 4] production gas cylinder with heavy caliber for hauled vehicle according to claim 1 seamless steel pipe, 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, wall thickness tolerance S ± 12.5% of steel pipe.
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| 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 |
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| CN110788141A (en) * | 2019-10-24 | 2020-02-14 | 衡阳华菱钢管有限公司 | Seamless steel tube, manufacturing method and high-pressure gas cylinder thereof |
| 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 |
| CN113909305A (en) * | 2021-09-22 | 2022-01-11 | 江苏天淮钢管有限公司 | Hot continuous rolling production method of 530 mm large-caliber seamless steel pipe |
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