CN101670389B - Manufacturing process of cold-drawing seamless steel tube for vehicular compressed natural gas annular-wrapped gas cylinder - Google Patents
Manufacturing process of cold-drawing seamless steel tube for vehicular compressed natural gas annular-wrapped gas cylinder Download PDFInfo
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Abstract
The invention relates to the process of cold-drawing seamless gas cylinder steel tube manufacturing, in particular to a manufacturing process of a cold-drawing seamless steel tube for a vehicular compressed natural gas annular-wrapped gas cylinder, comprising the following steps: hot-expanding: 1. inspecting and hot-rolling a material steel tube, 2. spraying graphite on the inner wall of the steel tube, 3. adjusting process parameters of a hot-expanding machine, 4. selecting the size of a core print, 5. hot-expanding, 6. clearing the graphite on the inner wall of the steel tube, and 7. inspecting a hot-expanding tube; and cold-drawing: 1. hot-expanding the material steel tube and charging, 2. pickling, 3. phosphating, 4. saponifying, 5. cold-drawing, and 6. inspecting a finished tube. The invention has the advantages that the cold-drawing seamless steel tube in the specification of Phi 356*5.5mm manufactured according to the process has more compact tissues, more excellent performance and higher geometric dimension precision, and can further improve the volume weight ratio of the gas cylinder.
Description
One, technical field
The present invention relates to the seamless cold gas cylinder steel tube and make field, particularly a kind of vehicular compressed natural gas annular-wrapped gas cylinder manufacturing process of cold-drawing seamless steel tube.
Two, background technology
Automobile is in recent years for adapting to a kind of novel gas cylinder that the CNG development of automobile is developed with compressed natural gas steel inner bushing ring to winding gas cylinder (twining bottle hereinafter to be referred as CNG), because it has characteristics such as volume by weight is smaller, is used widely in the CNG industry.What use more CNG gas cylinder at present is steel liner gas cylinder and steel winding gas cylinder, adorns inflammable and explosive medium in it, and nominal operating pressure is up to 20MPa, be in the car mobile status, if supervise ineffectively, as blast the pernicious serious accident that will very easily cause the dead group of group to hinder.It is reported that in recent years, CNG gas bottle explosion accident has taken place in some places at home, caused heavy economic losses and casualties, therefore, for ensureing public safety, according to the relevant rules of country, must carry out enforceable, legal periodic inspection to the CNG gas cylinder, eliminate accident potential.Therefore, it is particularly important to be used to make the manufacturing process control of solid drawn tube of compressed natural gas used as vehicle fuel steel inner bag hoop winding gas cylinder.This seamless steel pipe belongs to large-caliber thin-walled steel pipe, because of the restriction of raw material steel pipe hot rolling production technology, can't protect wall thickness so will adopt the cold-drawn means to obtain to hand over below the direct rolling 6mm of wall thickness.Existing technology is difficult to overcome the problem of large-caliber thin-walled steel pipe aligning difficulty, is difficult to guarantee that fished pipe satisfies the linearity requirement, controls the linearity of steel pipe after the cold-drawn by the design of mould size for this reason, makes it satisfy the technical standard requirement.
Three, summary of the invention
In order to solve above technical problem, and provide a kind of vehicular compressed natural gas annular-wrapped gas cylinder manufacturing process of cold-drawing seamless steel tube, use this technology can make the solid drawn tube of specification Φ 356 * 5.5mm, the solid drawn tube of this explained hereafter is organized more fine and close, be greatly improved aspect geometric accuracy and the evenness of wall thickness, mechanical performance obviously improves, and volume to weight ratio increases.
In order to achieve the above object, technical scheme of the present invention is: the vehicular compressed natural gas annular-wrapped gas cylinder manufacturing process of cold-drawing seamless steel tube, can make the cold-drawing seamless steel tube for vehicular wrapped gas cylinder of specification Φ 356 * 5.5mm by this technology, select specification Φ 273 * 7.5mm hot rolling raw material steel pipe for use, expand through heat, through being cold drawing to finished product, it is characterized in that again:
Described heat expands technological process: expands to Φ 370 * 7.3mm cold-drawn raw material steel pipe by Φ 273 * 7.5mm hot rolling raw material steel pipe heat,
1, surfaces externally and internally quality, external diameter, the wall thickness of the hot rolling raw material steel pipe of the described specification Φ 273 * 7.5mm of check;
2, wall graphite spraying within it, the preparation of the graphite aqueous solution require: 20 kilograms of graphite add 200 premium on currency;
3, adjust the technological parameter of thermal expansion machine: electric current 500-650 peace, voltage 400-500 volt, expansion speed 630mm/min;
4, selected core print size: Φ 355mm, the core print removing surface is clean, evenly smears graphite lubrication;
5, the preceding high back of blanking rack is low in front of the door to adjust thermal expansion machine, carries out heat and expands;
6, carry out interior mill, grind off the remaining graphite of steel pipe inwall;
7, check hot-expanding pipe surface quality, wall thickness;
Described cold-drawing technology flow process:
1, heat expansion raw material steel pipe feeds intake;
2, pickling: concentration of hydrochloric acid 20-30%,, time 4-8 hour, expand raw material steel pipe surfaces externally and internally oxide skin and graphite residue with heat and clean by temperature 20-45 ℃;
3, phosphatization: General Acidity in Phosphating Solution 10-30 point, free acid 1.0-2.5 point, temperature 50-80 ℃, time 30min.
4, saponification: saponification liquor aliphatic acid＞50 grams per liters, free acid＜5 grams per liters, 50～55 ℃ of temperature;
5, cold-drawn: pickling, lubricated qualified steel pipe carry out draw on 400 tons of hydraulic pressure cold drawing machines, according to raw steel thickness of pipe wall deviation size decision draw passage, by the reasonable apolegamy of interior outer mold and the operation of drawbench control system, finally control specification Φ 356 * 5.5mm solid drawn tube finished surface quality and physical dimension and make it reach standard-required;
6, check surfaces externally and internally quality, wall thickness, external diameter, flexibility, ovality;
7, ultrasonic examination.
Beneficial effect of the present invention: the compressed natural gas used as vehicle fuel steel inner bag hoop winding gas cylinder of the specification Φ 356 * 5.5mm that makes according to this technology is organized fine and close more with solid drawn tube, performance is better, geometric accuracy is higher, mechanical performance obviously improves, and can further improve the volume to weight ratio (volume/weight) of gas cylinder.
Four, the specific embodiment
Use technical scheme of the present invention to make material 30CrMo, specification Φ 356 * 5.5mm compressed natural gas used as vehicle fuel steel inner bag hoop winding gas cylinder solid drawn tube, its processing step is:
Can make the cold-drawing seamless steel tube for vehicular wrapped gas cylinder of specification Φ 356 * 5.5mm by this technology, select specification Φ 273 * 7.5mm hot rolling raw material steel pipe for use, expand, through being cold drawing to finished product, it is characterized in that again through heat:
Heat expands technological process: expanded to Φ 370 * 7.3mm cold-drawn raw material steel pipe by Φ 273 * 7.5mm hot rolling raw material steel pipe heat
1, surface quality, external diameter, the wall thickness of the hot rolling raw material steel pipe of check specification Φ 273 * 7.5mm.
2, wall graphite spraying within it, the preparation of the graphite aqueous solution require: 20 kilograms of graphite add 200 premium on currency.
3, adjust the technological parameter of thermal expansion machine: electric current 500-650 peace, voltage 400-500 volt, expansion speed 630mm/min.
4, selected core print size: Φ 355mm, the core print removing surface is clean, evenly smears graphite lubrication.
5, the preceding high back of blanking rack is low in front of the door to adjust thermal expansion machine, carries out heat and expands.
6, carry out interior mill, grind off the remaining graphite of steel pipe inwall.
7, check hot-expanding pipe surface quality, wall thickness.Whether mill back steel pipe exists defectives such as crackle, scuffing, interior rib by an inspection, above-mentioned defective is carried out reconditioning handle.
The cold-drawing technology flow process:
1, heat expansion raw material steel pipe feeds intake.
2, pickling, lubricated: concentration of hydrochloric acid 25%, 30 ℃ of temperature, expand raw material steel pipe surfaces externally and internally oxide skin with heat and the graphite residue is cleaned at 6 hours time.
3, phosphatization: General Acidity in Phosphating Solution 10-30 point, free acid 1.0-2.5 point, temperature 50-80 ℃, time 30min.
4, saponification: saponification liquor aliphatic acid＞50 grams per liters, free acid＜5 grams per liters, 50～55 ℃ of temperature.
5, cold-drawn: pickling, lubricated qualified steel pipe carry out draw on 400 tons of hydraulic pressure cold drawing machines, according to raw steel thickness of pipe wall deviation size decision draw passage, by the reasonable apolegamy of interior outer mold and the operation of drawbench control system, finally control specification Φ 356 * 5.5mm solid drawn tube finished surface quality and physical dimension and reach requirement.
6, check surfaces externally and internally quality, wall thickness, external diameter, flexibility, by the quality examination of Zhi Jinhang surfaces externally and internally, wall thickness inspection, sampling observation outer diameter of steel pipes, flexibility, ovality.
Specification Φ 356 * 5.5mm solid drawn tube size Control scope is:
External diameter scope: ± 0.75%
Wall thickness range: 0～+ 15%
Flexibility :≤1.5mm/M
75% of ovality and wall unevenness difference≤external diameter and wall thickness tolerance
Surface quality: the steel pipe surfaces externally and internally must not have crackle, fold, roll folding, absciss layer and scab, and these defectives must be removed, and the actual wall thickness of removing place must not be less than minimum wall thickness (MINI W.).
7, ultrasonic examination: steel pipe is pursued the Zhi Jinhang ultrasonic examination by standard.
8, sawing---steel pipe is carried out crop, back-end crop, cuts the processing of defective position.
9, seamless steel pipe is coated with oil processing.
According to above-mentioned technology, vertical mechanical property (material 30CrMo) of solid drawn tube, as shown in the table:
The above only is a kind of embodiment of the present invention, and unrestricted protection scope of the present invention.
Claims (1)
1. vehicular compressed natural gas annular-wrapped gas cylinder manufacturing process of cold-drawing seamless steel tube, can make the compressed natural gas used as vehicle fuel steel inner bag hoop winding gas cylinder solid drawn tube of specification Φ 356 * 5.5mm by this technology, select specification Φ 273 * 7.5mm hot rolling raw material steel pipe for use, expand through heat, through being cold drawing to finished product, it is characterized in that again:
Described heat expands technological process; Expand to Φ 370 * 7.3mm cold-drawn raw material steel pipe by Φ 273 * 7.5mm hot rolling raw material steel pipe heat,
1) surfaces externally and internally, external diameter, the wall thickness of the hot rolling raw material steel pipe of the described specification Φ 273 * 7.5mm of check;
2) wall graphite spraying within it, the preparation of the graphite aqueous solution require: 20 kilograms of graphite add 200 premium on currency;
3) technological parameter of adjustment thermal expansion machine: electric current 500-650 peace, voltage 400-500 volt, expansion speed 630mm/min;
4) selected core print size: Φ 355mm, the core print removing surface is clean, evenly smears graphite lubrication;
5) the preceding high back of blanking rack is low in front of the door to adjust thermal expansion machine, carries out heat and expands;
6) carry out interior mill, grind off the remaining graphite of steel pipe inwall;
7) check hot-expanding pipe surface quality, wall thickness;
Described cold-drawing technology flow process:
1) heat expansion raw material steel pipe feeds intake;
2) pickling, lubricated: concentration of hydrochloric acid 20-30%,, time 4-8 hour, expand raw material steel pipe surfaces externally and internally oxide skin with heat and the graphite residue is cleaned by temperature 20-45 ℃;
3) phosphatization: General Acidity in Phosphating Solution 10-30 point, free acid 1.0-2.5 point, temperature 50-80 ℃, time 30min;
4) saponification: saponification liquor aliphatic acid＞50 grams per liters, free acid＜5 grams per liters, 50～55 ℃ of temperature;
5) cold-drawn: pickling, lubricated qualified steel pipe carry out draw on 400 tons of hydraulic pressure cold drawing machines, according to raw steel thickness of pipe wall deviation size decision draw passage, by the reasonable apolegamy of interior outer mold and the operation of drawbench control system, finally control specification Φ 356 * 5.5mm solid drawn tube finished surface quality and physical dimension and make it reach standard-required;
6) check surfaces externally and internally quality, wall thickness, external diameter, flexibility;
7) ultrasonic examination.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104148440A (en) * | 2014-08-11 | 2014-11-19 | 天津润德中天钢管有限公司 | Process for manufacturing cold-drawing seamless tube for large-volume gas cylinder |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873126B (en) * | 2012-09-29 | 2014-12-03 | 攀钢集团成都钢钒有限公司 | Manufacturing method of large-aperture thin-walled seamless steel tube for nuclear power plant |
| CN102962273B (en) * | 2012-11-23 | 2016-01-20 | 中材科技（南通）有限公司 | The manufacture method of the ultra-thin seamless steel pipe of vehicle glass fiber full wrapped cylinders cold-drawn |
| CN103624102B (en) * | 2013-12-04 | 2015-11-18 | 海盐三鑫钢管有限公司 | The processing method of cold drawing oil earthen pipe |
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| CN1676272A (en) * | 2005-04-18 | 2005-10-05 | 宝钢集团上海五钢有限公司 | OOCr22Ni5MO3N high-nitrogen steel seamless steel pipe manufacturing method |
| CN1908501A (en) * | 2006-08-15 | 2007-02-07 | 石家庄安瑞科气体机械有限公司 | Steel inner container big capacity high pressure tank and its preparation |
| CN101220443A (en) * | 2008-01-22 | 2008-07-16 | 江苏长盈不锈钢管有限公司 | Stainless steel weldless steel tube for ship and producing technique |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676272A (en) * | 2005-04-18 | 2005-10-05 | 宝钢集团上海五钢有限公司 | OOCr22Ni5MO3N high-nitrogen steel seamless steel pipe manufacturing method |
| CN1908501A (en) * | 2006-08-15 | 2007-02-07 | 石家庄安瑞科气体机械有限公司 | Steel inner container big capacity high pressure tank and its preparation |
| CN101220443A (en) * | 2008-01-22 | 2008-07-16 | 江苏长盈不锈钢管有限公司 | Stainless steel weldless steel tube for ship and producing technique |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104148440A (en) * | 2014-08-11 | 2014-11-19 | 天津润德中天钢管有限公司 | Process for manufacturing cold-drawing seamless tube for large-volume gas cylinder |
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