CN105619085A - Production technology for large-volume steel seamless cylinder with diameter being 914 mm - Google Patents
Production technology for large-volume steel seamless cylinder with diameter being 914 mm Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention relates to a production technology for a large-volume steel seamless cylinder with the diameter being 914 mm, and belongs to the technical field of steel pressure container production. Sawing is conducted on a tube blank firstly, perforating and hot rolling are conducted after heating, and a crude tube is obtained; after being annealed and straightened, the crude tube is subjected to cold rolling through a 920 multi-roller cold-rolling mill, a seamless cylinder tube is obtained, and a finished seamless cylinder tube is obtained through annealing, straightening and grinding; and a semi-finished seamless cylinder obtained through spinning shrinkage is subjected to quenching and tempering thermal treatment, shot blasting is conducted on the inner surface and the outer surface of the seamless cylinder, thread machining is conducted on a cylinder opening, detection is conducted, a qualified product is taken to be dried, N2 is introduced for protection, and the large-volume steel seamless cylinder with the diameter being 914 mm is obtained. The production technology has the beneficial effects of being short in manufacturing period, free of welding lines, resistant to the high pressure and the like. Meanwhile, the manufacturing technology is mature, the procedure is simple, safety and reliability are achieved, and production is convenient.
Description
Technical field
The present invention relates to the production technical field of compressed natural gas pressure vessel, particularly relate to the production method of the standby big volume seamless steel gas cylinder of a kind of cold roll seamless control.
Technical background
Seamless steel gas cylinder material general trend be from mild steel to medium carbon steel, carbon manganese steel, chrome-molybdenum steel and steel alloy development, the yield strength of material improves, it means that under identical design parameter, gas cylinder wall thickness declines, and quality alleviates. The sixties in 20th century, CPI company of the U.S. adopts the mode that drawn and iron closes up successfully to develop the big volume seamless steel gas cylinder of unit volume 500L; The nineties in 20th century, Mannesmann of Germany, U.S. CPI, Italy Dalmine and NK company of Korea S use chrome-moly steel produce volume with the method for spinning closing-in and reach the big volume seamless steel gas cylinder of more than 2000L.
China's gas cylinder manufacturing industry is risen later, until the nineties in 20th century, the big volume seamless steel gas cylinder of China also relies primarily on import, and at the beginning of 21 century, China starts independently to manufacture big volume seamless steel gas cylinder.
Big volume seamless steel gas cylinder diameter in the market mostly is 559mm and 715mm, as, Handan heavy-duty machinery company limited and Shijiazhuang AnRuiKe gas Machine Co., Ltd produce the maximum nominal volume of the maximum gauge 559mm big volume seamless steel gas cylinder up to 2000L with the method for spinning closing-in, just realize the production domesticization of big volume seamless steel gas cylinder. The development of major diameter, big volume seamless steel gas cylinder is trend of the times.
Summary of the invention
It is an object of the invention to propose a kind of diameter that makes and reach the big volume seamless steel gas cylinder production technology of 914mm.
Pipe, from pipe raw material sawing, is first carried out sawing by the present invention, and after heating, perforation, hot rolling, obtain hollow forging; Then through 920 multiple rollers cold calender rolled by cold rolling machine after hollow forging annealing being aligned, obtain seamless gas cylinder pipe, obtain seamless gas cylinder pipe finished product then through annealing, aligning, grinding; The seamless gas cylinder semi-finished product obtained after spinning closing-in, after quenching and tempering heat treatment, carry out surfaces externally and internally ball blast, and bottleneck are carried out screw thread process seamless gas cylinder, then through detection, take certified products drying and fill N2Protection, obtains the big volume seamless steel gas cylinder of diameter 914mm.
The present invention compares the big volume seamless steel gas cylinder production method of tradition, and it has the advantages of:
1, the roll piercing equipment special adopted, become to close deformation space by built-in top tool and mould, outside guide plate Treatment On Cross Roller, produce significant shear power, roll-force, realizing the distinctive interior two-sided rolling of crowded external pressure, contact area is big, and deformation is uniformly, eliminate the casting flaw such as column crystal, segregation to greatest extent, improve equiaxial crystal ratio, crystal grain thinning, it is achieved intercrystalline strengthening, martensite lath strengthening, precipitation strength, it is thus achieved that the major diameter air bottle steel seamless pipe of excellent performance.
2, substituting conventional cylinder pipe cold-drawing technology, steel tube surface quality and wall thickness quality after adopting 920 multiple rollers cold calenders cold rolling significantly improve, and especially the seamless steel pipe product effect of major diameter, thin-walled thickness are become apparent from. Production tube surface accuracy obtained after cold rolling can reach 1.6, and outside dimension precision reaches �� 1%, and wall thickness accuracy can control, in �� 4% scope, to reach machine cut requirement on machining accuracy.
It addition, wall thickness centering capacity reaches 75%; Production procedure shortens 60%, pollutes minimizing 50%, and energy-conservation 25%, lumber recovery is up to 95%, and the tool and mould life-span is long, and the pass life-span, up to 300 tons, can be changed a social system and repeatedly use;
3, the double rotary wheel spinning closing-in mode adopted, has good Forming Quality, and shaping efficiency is high, it is possible to adapting to large-sized seamless gas cylinder and produce, the seamless gas cylinder surface smoothness of production is good, and stable performance. Can be prevented effectively from occur steel pipe closing in forming dimension, bottleneck thicken, bottleneck crackle, the spinning defect such as folding, it is ensured that diameter 914mm seamless steel pipe spinning closing-in quality.
4, the two-sided quenching adopted and tempering process, it is possible to avoid being relatively large in diameter of the product due to the present invention, corresponding gas cylinder internal space is also relatively big, can there is the problem that internal heat is difficult to quickly release. The gas cylinder surfaces externally and internally temperature difference is reduced, thus the stress produced is less. And, during two-sided quenching, the average cooling rate of gas cylinder is faster than critical quenching rate, and cooling terminates the temperature of rear gas cylinder close to Ms point, and martensite transfor mation is more complete, and after gas cylinder quenching, obtained tissue and performance are more excellent and uniform.
Pipe of the present invention is 4130Q continuous casting circular tube blank, and pipe diameter is �� 700mm, and pipe every meter flexibility��6mm, total flexibility is not more than the 0.6% of total length.
The present invention preferentially selects the 4130Q steel elements such as Mn, Al, Ni, Ti, S, P affecting laws to 4130 component segregations, grain size, low-temperature flexibility, corrosion resistance etc. that has been systematic study, on the basis of 4130 steel, microalloy treatment is carried out, it is achieved grain refinement, enhancing precipitating reinforcing effect by adding the elements such as Al, Ni, Ti of trace; Reduce S, P content simultaneously, improve alloy degree of purity, improve low-temperature flexibility and corrosion resistance. Adopt �� 700mm diameter pipe can preferentially ensure rolling ratio and metal uniformity, improve microstructure uniformity. Flexibility is strict with the annular cross section Wall thickness uniformity and dimensional accuracy that ensure rolling steel cylinder, it is ensured that product safety uniform-compression.
When described perforation, hot rolling, blank temperature is 1220 �� 20 DEG C, adopts �� 800 perforating machine during perforation, adopts �� 960 milling train during hot rolling. In steel pipe rolling process, adopt temperature control controlled rolling, utilize primary deformable instrument �� 800 perforating machine, �� 960 milling train controlled rolling, then carry out reeler expansion, it is ensured that structural homogenity, evenness of wall thickness, it is therefore prevented that component segregation, then carry out determining tube reducing. Can effectively suppress Mannesmann effect, reduce the probability that in pierced billet process, table is torn, it is ensured that inner surface quality; Controlled rolling process adjusts the controlled rolling realizing in hollow billet controlled rolling technology by rolling parameter is continued to optimize, it is achieved size that first batch of newly-designed products requires close to finished product and structure property control. Hollow forging after �� 960 milling train rolls, then it is carried out high accuracy multiple rollers cold calender rolling. After adopting above temperature control controlled rolling process, after perforation, rolling, cold dimensional tolerance is: D: �� 10mm; S: �� 2mm; L: �� 100mm.
The temperature conditions of described hollow forging annealing aligning is 720��740 DEG C, temperature retention time 250min, flexibility��2mm/m after aligning. In conjunction with hot-puncturing process, High Precision Cold and two-sided quenching, tempering process, effectively eliminate segregation, again crystal grain thinning, it is thus achieved that grain size reaches the small grains of 6.5��7 grades and the tempered sorbite tissue of the uniform small and dispersed of carbide. The multiple strengthening means such as comprehensive utilization refined crystalline strengthening, solution strengthening, precipitation strength, working hardening, make material mechanical performance and corrosion resisting property increase substantially.
The annealing temperature condition of seamless gas cylinder pipe is 720��740 DEG C, temperature retention time 250min, seamless gas cylinder pipe carries out after annealing pressure and rectifys aligning. By 720��740 DEG C, the high annealing of temperature retention time 250min, it is heated between Ac1-Ac3 temperature, reaches incomplete austenitizing, cool down after long-time heat preservation. This annealing process purpose is to make portion of tissue austenitizing in steel, adjusts tissue, eliminates tissue defects, reduces hardness, improves cold-workability; Elimination residual stress, stable dimensions, it is ensured that the flexibility of spinning gas cylinder tube, ready for follow-up spinning operation.
Adopt digitised Intermediate Frequency power supply heating system that seamless gas cylinder pipe finished end carries out local heating, the double rotary wheel spinning closing-in mode of employing during spinning closing-in, altogether through 13 passage mould pressings, revolve temperature >=820 DEG C eventually. The spinning closing-in technology of the present invention, adopt digitised Intermediate Frequency power supply heating system that seamless steel pipe end carries out local heating, this system can be run under the frequency of 40��10kHz, utilize IGCT that three-phase main-frequency AC energy transfers to the single phase ac electric energy of hundreds of or a few KHz, adopt Digital Circuit Control technology, it is adaptable to diameter 914mm heavy caliber seamless steel pipe heats. Use Principles of Metal Forming, to the big volume seamless steel gas cylinder product of diameter 914mm through 13 passage mould pressings.
The water adopting 880 DEG C during the quenching of seamless gas cylinder semi-finished product is that quenching liquid carries out two-sided quenching, temperature retention time 30min; After quenching, dry seamless gas cylinder semi-finished product are placed in 540 DEG C of temperature environments and carry out tempering heat, temperature retention time 120min. The half-finished Technology for Heating Processing of this seamless gas cylinder, can obtain excellent comprehensive mechanical performance, namely when obtaining high intensity, has enough toughness, thus ensureing the use safety of steel cylinder simultaneously.
Detailed description of the invention
Referring to embodiment, the present invention is described in further detail, but the invention is not restricted to the following description.
The big volume seamless steel gas cylinder of �� 914 �� 22.5mm specification 6500L that the continuous casting circular tube blank that the present invention adopts 4130Q alloy steel products, diameter to be �� 700 makes, operating pressure is 25MPa.
One, ingredient requirement:
The continuous casting circular tube blank adopting 4130Q alloy steel products, diameter to be �� 700, pipe every meter flexibility��6mm, total flexibility is not more than the 0.6% of total length.
By weight percentage, each constituent content is 4130Q material composition:
C:0.30%��0.35%, Si:0.15%��0.30%, Mn:0.80%��0.90%, Cr:0.95%��1.10%, Mo:0.20%��0.25%, P��0.013%, S��0.003%, P+S��0.015%, Als:0.02%��0.04%, Ti :��0.015%, all the other are Fe.
Two, the production craft step realizing diameter 914mm big volume seamless steel gas cylinder is as follows:
1, with sawing machine, continuous cast round billets seamless gas cylinder pipe blank tube material is carried out sawing, cutting length 2730 �� 10mm.
2, pipe deep hole drilling machine beats internal point, internal point diameter 100mm.
3, pipe enters annular furnace heating, heating-up temperature 1220 �� 20 DEG C.
4, pipe is bored a hole with 800 perforating machinees and 960 milling trains, rolls after heating, cold dimensional tolerance: diameter D: �� 10mm; Wall thickness S: �� 2mm; Length L: �� 100mm.
5, to the hollow billet annealing aligning after rolling, annealing temperature 720��740 DEG C, temperature retention time 250min, flexibility��2mm/m, total length��5mm after aligning. Grinding machine polishing surfaces externally and internally, inside and outside polishing stock removal��2mm.
6, delivering to 920 multiple rollers cold calenders cold rolling, the seamless gas cylinder pipe specification obtained after cold rolling is: �� 917 �� 25.4, dimensional tolerance: diameter D:917 �� 3mm; Wall thickness S: �� 1mm.
7, the seamless gas cylinder pipe annealing after cold rolling, annealing temperature 720��740 DEG C, temperature retention time 250min, seamless gas cylinder pipe carries out after annealing pressure rectify aligning and surfaces externally and internally is polished, interior grinding process requires: seamless gas cylinder pipe internal surface is used after polishing and checked, must not have folding, crackle, cut, scab, pockmark, concavo-convex defect and casting skin exist, and outer grinding process requires: diameter D:912mm��918mm; Wall thickness S:22.5mm��25.0mm. Then carry out scale sawing by seamless gas cylinder specification, enter back into seamless gas cylinder and manufacture link.
8, with 920 double rotary wheel spinning machines, seamless gas cylinder pipe is carried out heat rotation to close up, adopt digitised Intermediate Frequency power supply heating system that seamless steel pipe end carries out local heating, this system can be run under the frequency of 40��10kHz, utilize IGCT that three-phase main-frequency AC energy transfers to the single phase ac electric energy of hundreds of or a few KHz, adopt Digital Circuit Control technology, it is adaptable to diameter 914mm heavy caliber seamless steel pipe heats.
Heating in medium frequency electric current is set to 650A heating and is slowly heated to 1220 �� 20 DEG C, notes material temperature change, adopt 13 passage mould pressings altogether in spinning process, and rotation temperature must not lower than 820 DEG C eventually, and bottleneck hole size is not less than 166mm less than 101mm and outside dimension.
9, the seamless gas cylinder obtained carries out bottleneck roughing through boring machine, and internal diameter of the bottleneck boring is to 105 �� 1mm, and working depth is 100 �� 1mm, and heat treatment sent to by the gas cylinder after bottleneck roughing.
10, heat treatment adopts two-sided quenching in conjunction with tempering process integration, makes seamless gas cylinder performance reach standard-required. The water adopting 880 DEG C during the quenching of seamless gas cylinder semi-finished product is that quenching liquid carries out two-sided quenching, temperature retention time 30min; After quenching, dry seamless gas cylinder semi-finished product are placed in 540 DEG C of temperature environments and carry out tempering heat, temperature retention time 120min, air cooling of then coming out of the stove.
11, to after heat treatment seamless gas cylinder ball blast polish surfaces externally and internally, inner surface ball blast terminate after by seamless gas cylinder internal residual alloy pellets evacuation.
12, the processing of seamless gas cylinder bottleneck is divided into roughing and two discontinuous steps of polish.
Roughing carries out on boring machine (TPX61110), reams, with cutterhead brush, the length that bottle mouth of gas cylinder is unnecessary, and by internal diameter of the bottleneck boring to 105 �� 1mm, working depth is 100 �� 1mm, to the reserved 1-2mm length allowance of polish.
Polish carries out whorl of bottleneck processing on CK61250 numerically controlled lathe, and female thread is G4 screw thread, external screw thread M165 �� 3-6g screw thread. Screw thread should have complete die mould, is not allow for setting one's teeth on edge, the defect such as flat tooth, tooth are wealthy, tooth two-wire and burr exist, and thread surface roughness is 3.2.
13, seamless gas cylinder being carried out Non-Destructive Testing, bottle ultrasonic examination, whorl of bottleneck does magnetic powder inspection. Seamless gas cylinder carries out the water pressure test, hydraulic test pressure 37.5MPa, dwell time 2min, and test water temperature is not less than 5 DEG C, and the gas cylinder after the water pressure test carries out drying, filling N2Protection processes.
14, seamless gas cylinder being carried out final size inspection, the wall thickness of any point of gas cylinder cannot be less than the minimum thickness value that detail of design specifies, the ovality of gas cylinder, and namely the difference of maximum on same cross section, minimum outer diameter, is not to be exceeded the 2% of this cross section mean outside diameter. The thickest of same cross section and minimum wall thickness (MINI W.) difference less than this cross section average wall thickness 12.5%, the outside diameter tolerance of gas cylinder should not exceed its nominal diameter �� 1%, measure at cylinder 1/2 and 1/4 length place, cylinder every meter linearity cannot be greater than 3mm, total length linearity cannot be greater than the 1.5 �� of bottle length, the length tolerance of gas cylinder be design total length �� 1.5%, and be not more than 50mm.
The big volume seamless steel gas cylinder product of qualified diameter 914mm is checked to put in storage.
Claims (7)
1. the big volume seamless steel gas cylinder production technology of diameter 914mm, first carries out sawing to pipe, and after heating, perforation, hot rolling, obtain hollow forging; Then through 920 multiple rollers cold calender rolled by cold rolling machine after hollow forging annealing being aligned, obtain seamless gas cylinder pipe, obtain seamless gas cylinder pipe finished product then through annealing, aligning, grinding; The seamless gas cylinder semi-finished product obtained after spinning closing-in, after quenching and tempering heat treatment, carry out surfaces externally and internally ball blast, and bottleneck are carried out screw thread process seamless gas cylinder, then through detection, take certified products drying and fill N2Protection, obtains the big volume seamless steel gas cylinder of diameter 914mm.
2. production technology according to claim 1, it is characterised in that described pipe is 4130Q continuous casting circular tube blank, pipe diameter is �� 700mm, and pipe every meter flexibility��6mm, total flexibility is not more than the 0.6% of total length.
3. production technology according to claim 1, it is characterised in that when described perforation, hot rolling, blank temperature is 1220 �� 20 DEG C, adopts �� 800 perforating machine during perforation, adopt �� 960 milling train during hot rolling.
4. production technology according to claim 1, it is characterised in that the temperature conditions of described hollow forging annealing aligning is 720��740 DEG C, temperature retention time 250min, flexibility��2mm/m after aligning.
5. production technology according to claim 1, it is characterised in that the annealing temperature condition of seamless gas cylinder pipe is 720��740 DEG C, temperature retention time 250min, carries out pressure and rectifys aligning seamless gas cylinder pipe after annealing.
6. production technology according to claim 1, it is characterized in that, during spinning closing-in, adopt digitised Intermediate Frequency power supply heating system that seamless gas cylinder pipe finished end carries out local heating, the double rotary wheel spinning closing-in mode of employing, altogether through 13 passage mould pressings, revolve temperature >=820 DEG C eventually.
7. production technology according to claim 1, it is characterised in that the water adopting 880 DEG C during the quenching of seamless gas cylinder semi-finished product is that quenching liquid carries out two-sided quenching, temperature retention time 30min; After quenching, dry seamless gas cylinder semi-finished product are placed in 540 DEG C of temperature environments and carry out tempering heat, temperature retention time 120min.
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| CN106002644A (en) * | 2016-06-06 | 2016-10-12 | 洛阳双瑞特种装备有限公司 | Treatment method for inner surface of steel high pressure gas cylinder for high purity gas |
| CN106002640A (en) * | 2016-06-06 | 2016-10-12 | 洛阳双瑞特种装备有限公司 | Forming method of large-volume high-purity industrial gas bottle type steel container |
| CN106438567A (en) * | 2016-08-30 | 2017-02-22 | 徐州徐工液压件有限公司 | Hollow hydraulic cylinder part with one sealed end and manufacturing method thereof |
| CN108188301A (en) * | 2018-01-26 | 2018-06-22 | 烟台台海材料科技有限公司 | A kind of preparation method and gas cylinder of seamless gas cylinder |
| CN109759478A (en) * | 2019-01-22 | 2019-05-17 | 德新钢管（中国）有限公司 | A kind of manufacturing method of big volume seamless steel pipe for gas cylinder |
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| CN114472583A (en) * | 2022-03-11 | 2022-05-13 | 湖南中创空天新材料股份有限公司 | Processing method of special-shaped reducing thin-wall seamless aluminum pipe with two closed ends at two ends |
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| CN106002644A (en) * | 2016-06-06 | 2016-10-12 | 洛阳双瑞特种装备有限公司 | Treatment method for inner surface of steel high pressure gas cylinder for high purity gas |
| CN106002640A (en) * | 2016-06-06 | 2016-10-12 | 洛阳双瑞特种装备有限公司 | Forming method of large-volume high-purity industrial gas bottle type steel container |
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| CN106438567B (en) * | 2016-08-30 | 2018-03-20 | 徐州徐工液压件有限公司 | A kind of the hollow hydraulic cylinder part and its processing method of one end closing |
| CN108188301A (en) * | 2018-01-26 | 2018-06-22 | 烟台台海材料科技有限公司 | A kind of preparation method and gas cylinder of seamless gas cylinder |
| CN109759478A (en) * | 2019-01-22 | 2019-05-17 | 德新钢管（中国）有限公司 | A kind of manufacturing method of big volume seamless steel pipe for gas cylinder |
| CN110404972A (en) * | 2019-07-15 | 2019-11-05 | 扬州诚德钢管有限公司 | A kind of production method for the seamless steel pipe that diameter is 1422mm |
| CN112372238A (en) * | 2020-09-29 | 2021-02-19 | 浙江蓝能燃气设备有限公司 | High-pressure ultrahigh-pressure hydrogen storage bottle type container and manufacturing method thereof |
| CN114321702A (en) * | 2021-12-31 | 2022-04-12 | 江苏呈森嘉泽能源科技有限公司 | Ultralow-temperature double-thermal-insulation-layer liquid helium welding heat-insulation gas cylinder and manufacturing method and system thereof |
| CN114147131A (en) * | 2022-02-10 | 2022-03-08 | 四川大学 | Homogenizing hot spinning forming method for large-diameter high-pressure gas cylinder |
| CN114147131B (en) * | 2022-02-10 | 2022-04-29 | 四川大学 | Homogenizing hot spinning forming method for large-diameter high-pressure gas cylinder |
| CN114472583A (en) * | 2022-03-11 | 2022-05-13 | 湖南中创空天新材料股份有限公司 | Processing method of special-shaped reducing thin-wall seamless aluminum pipe with two closed ends at two ends |
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