CN102962290B - Improve the production technology of solid drawn tube surface accuracy - Google Patents
Improve the production technology of solid drawn tube surface accuracy Download PDFInfo
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- CN102962290B CN102962290B CN201210474926.5A CN201210474926A CN102962290B CN 102962290 B CN102962290 B CN 102962290B CN 201210474926 A CN201210474926 A CN 201210474926A CN 102962290 B CN102962290 B CN 102962290B
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Abstract
The present invention relates to a kind of high-efficient production technology improving solid drawn tube surface accuracy, it includes 1) heat treatment, steel pipe is sent in heat-treatment furnace, heat treatment is carried out under 800-1000 degree Celsius, then isothermal holding is carried out, temperature retention time is 1.5-2.5 times of steel pipe wall thickness, and holding temperature is 500-700 degree Celsius; 2) chemical deoxidization skin, steel pipe to room temperature, is then soaked in the mixed liquor of hydrochloric acid that mass fraction is 15%-20% and remover, soaks half an hour by steel pipe air cooling; 3) clean, use clean water; 4) neutralizing, be immersed in sodium hydroxide solution by steel pipe, the PH of sodium hydroxide solution is 10-14, and soak time is 0.5-1 hour; 5) operation is antirust, and by steel pipe immersion in liquid preventives agent, soak time is 3-5 minute; 6) finely align, use 11 roller straighteners to align; Etc. step. Leveling effect of the present invention is good, safe and convenient to use, saves the energy, and capacity usage ratio is high, and descale is effective.
Description
Technical field
The present invention relates to a kind of solid drawn tube production technology, particularly to a kind of production technology improving solid drawn tube surface accuracy.
Background technology
At present in solid drawn tube manufacture process, the heat treatment process of domestic tradition seamless steel tube production adopts common (having oxidation) heat treatment mostly, production cost and equipment investment are low, but cause that steel pipe finished product heat-treated steel pipe produces serious oxide skin, steel tube surface pit is caused through aligning rear oxidation skin press-in steel tube surface, the defects such as load mould, do not reach the high-precision requirement that parts use, subsequent handling has to pass through car, service precision requirement is can be only achieved after mill manufacturing procedure, increase production cost not only to parts manufacturing enterprise, also reduce effect simultaneously. though there is protective gas heat-treatment furnace in minority steel pipe's production enterprise, but once invests height due to equipment, yield poorly, and energy consumption and protective gas consuming cost expensive, production cost is higher, affects the economic benefit of enterprise. the tube product that cold-drawn is cold rolling, though can guarantee that the inside and outside precision that steel pipe is certain, but the big cold deformation technique such as tube product enlarging in parts machining operation, crimping, clod wash can not be met, thereby ensure that tube product precision and excellent structure property are in steel pipe's production and problem to be solved.
Publication number is the Chinese invention patent of CN102010961A, discloses a kind of production technology of steel tube, and this technique includes the operations such as unit rod peeling perforation, pickling, antirust treatment. By pickling scale removal, this invention adopts 15-20% hydrochloric acid+1%-2% nitric acid+200 g/l+water of ferrous content to carry out surface treatment process, processes the time: for 30-60 minute, temperature was room temperature.Ferrous iron owing to adding nitric acid makes to react excessively fierce when pickling, and not only too fast lifting temperature, and it would furthermore be possible to cause certain damage to pipe embryo.
Summary of the invention
It is an object of the invention to overcome above shortcomings in prior art, and provide a kind of step simple, surface accuracy is high, the production technology improving solid drawn tube surface accuracy that deoxygenated bark effect is good.
This invention address that the problems referred to above be the technical scheme is that the production technology of this raising solid drawn tube surface accuracy, it is characterised in that comprise the following steps.
1) heat treatment, sends into steel pipe in heat-treatment furnace, carries out heat treatment under 800-1000 degree Celsius, then carries out isothermal holding, and temperature retention time is 1.5-2.5 times of steel pipe wall thickness, and holding temperature is 500-700 degree Celsius; Be conducive to improving heat insulation effect, it is possible to carry out different holding temperatures according to steel pipe wall thickness, both saved energy, and improve again effect. Holding temperature, between 500-700 degree, both reaches to adjust the effect of lattice, temperature can be prevented again too high and make steel tube surface oxide skin blocked up.
2) chemical deoxidization skin, steel pipe to room temperature, is then soaked in the mixed liquor of hydrochloric acid that mass fraction is 15%-20% and remover, soaks half an hour by steel pipe air cooling; Remover is the state of the art, but remover uses together with the hydrochloric acid of 15%-20% can have better effect, compare with the content disclosed in the description of CN102010961A, decrease nitric acid and namely ferrum decrease input, also prevent and damage steel pipe due to vigorous reaction.
3) clean, use clean water; Can effectively remove the residual acid solution and dirt that residue on steel pipe.
4) neutralizing, be immersed in sodium hydroxide solution by steel pipe, the PH of sodium hydroxide solution is 10-14, and soak time is 0.5-1 hour; Suitable concentration can improve the effect of neutralization and reduce the alkali liquor that remains on steel pipe.
5) operation is antirust, and by steel pipe immersion in liquid preventives agent, soak time is 3-5 minute; Improve rust prevention during manufacture effect.
6) finely align, use 11 roller straighteners to align; Leveling effect can be improved; Steel tube surface oxide skin is first removed, it is prevented that during aligning, oxide skin weighs steel tube surface wounded after heat treatment.
7) finished product crop end, by the excision end to end of steel pipe; Improve the quality of steel pipe.
8) high speed rubbing down, uses polishing and burnishing machine that steel pipe is carried out rubbing down; Improve steel tube surface precision quality.
9) defat, uses degreasing agent that steel pipe is carried out defat; Degreasing agent is prior art, but carries out defat after rubbing down again and can improve the result of use of steel pipe.
10) clean, use clean water steel pipe; Effectively remove debris, improve tube quality.
11) corrosion protection, is immersed in water-soluble anti-rust oil by steel pipe, and the soak at room temperature time is 0.5-1 hour. Antirust oil is prior art, soaks antirust oil after rubbing down and defat, it is possible to prevents antirust oil to be subject on steel pipe residue and pollutes, improves the service life of antirust oil, can save antirust oil by antirust oil on immersion way.
The step 1 of the present invention) in, heat treatment temperature is 900 degrees Celsius, and holding temperature is 600 degrees Celsius, and temperature retention time is 2 times of pipe thickness. This temperature and temperature retention time have the effect of the best.
The step 2 of the present invention) in, after the hydrochloric acid using mass fraction to be 5% and remover mixing, steel pipe is processed. The hydrochloric acid using low concentration can reduce volatility, improves the working environment of workman, and the hydrochloric acid of low concentration can use the side-product of other industries, recycles resource.The hydrochloric acid of low concentration can also process the steel pipe with uniform temperature, and the hydrochloric acid such as 5% can treatment temperature be the steel pipe of 50-70 degree Celsius, and hydrochloric acid volatile quantity now can control in certain scope.
The described step 6 of the present invention) in 11 roller straighteners include 11 strong roller groups, each strong roller group is made up of the upper strong roller cooperated and lower strong roller. Use 11 roller straighteners can leveling effect.
Described 11 strong roller groups of the present invention are arranged in order, and described n-th is rectified upper roller of rectifying in roller group and become 32-N degree with the angle of lower strong roller. Make the angle respectively 31,30,29,28,27,26,25 degree of the upper and lower strong roller of 11 strong roller groups, the increase of angle can so that upper strong roller and lower strong roller be tightr with steel tube surface close contact, gradual raising aligning strength keeps effect more stable after can making aligning, also reduce internal stress, it is ensured that the surface accuracy of steel pipe.
The present invention compared with prior art, has the following advantages and effect: leveling effect is good, safe and convenient to use, saves the energy, and capacity usage ratio is high, and descale is effective. What adopt high-efficiency environment friendly after heat treatment is chemically removed steel tube surface oxide skin, then be carried out, neutralize, antirust treatment. Finely aligning, before aligning, steel tube surface oxide skin is removed, oxide skin press-in steel tube surface will not be made to cause pit, load mould, it is ensured that the precision of steel tube surface. Steel pipe is carried out high speed rubbing down, also can improve original solid drawn tube surface accuracy, reach steel tube surface superhigh precision requirement.
Accompanying drawing explanation
Fig. 1 is the part-structure schematic diagram of 11 roller straighteners in embodiment.
Label declaration: above rectify roller 1, lower strong roller 2.
Detailed description of the invention
Below in conjunction with accompanying drawing and by embodiment, the present invention is described in further detail, and following example are explanation of the invention and the invention is not limited in following example.
Embodiment 1.
In the present embodiment, steel pipe is that moral mark E355 material is made.
The production technology improving solid drawn tube surface accuracy comprises the following steps:
1) heat treatment, sends into steel pipe in heat-treatment furnace, carries out heat treatment under 900 degrees Celsius, then carries out isothermal holding, and temperature retention time is 2 times of steel pipe wall thickness, and holding temperature is 600 degrees Celsius. In the present embodiment, steel pipe thickness is 10 millimeters, due to 2 times that temperature retention time is steel pipe wall thickness, so temperature retention time is 20 minutes. In the present invention, step 1) in temperature retention time in minutes, thickness of steel pipe is in millimeter. Due in heat treatment process, steel pipe can by the oxygen institute partial oxidation in air, and heat treatment temperature more high rate of oxidation is more fast, can ensure that under the premise with certain thermal treatment rate so selecting 900 degrees Celsius, ensureing that again degree of oxidation controls in acceptable degree. Insulation can improve the stability of lattice in steel pipe, due to the stable lattice time that the steel pipe of thickness of pipe wall takes longer for, so regulating temperature retention time with pipe thickness can improve lattice stability within the shortest time. In the present invention, heat treatment temperature can be 800,850,950 or 1000 degrees Celsius, and holding temperature can be 500,550,650 or 700 degrees Celsius, and temperature retention time can be the 1.5 of steel pipe wall thickness, 1.7,1.9,2.3 or 2.5 times.
2) chemical deoxidization skin, steel pipe to room temperature, is then soaked in the mixed liquor of hydrochloric acid that mass fraction is 15%-20% and remover, soaks half an hour by steel pipe air cooling.Owing to hydrochloric acid has volatility but will not corrode the matrix of steel, can effectively keep the original surface roughness of steel tube surface, if temperature of steel pipe is too high can accelerate hydrochloric acid volatilization, not only cause waste, and contaminated environment. Hydrochloric acid and remover mixing can significantly more efficient removing oxide skin, remover can improve the effect of hydrochloric acid. The reason not adopted cleaning way by immersion way is, if hydrochloric acid has volatility flushing and can increase the contact area of hydrochloric acid and air, thus increasing the volatile quantity of hydrochloric acid, to cause waste and environmental pollution. Mass fraction is the hydrochloric acid of 15%-20% and remover refers to that the quality of hydrochloric acid accounts for the 15%-20% of mixed liquor, and the amount of remover can be added as one sees fit.
3) clean, use clean water; Steel pipe being put into the rinse bath being contained with clear water, uses clear water soaking and washing, soak time is 30 minutes. The hydrochloric acid of cleaning and removing steel tube surface and remover, reduce the processing cost of next step operation.
4) neutralizing, be immersed in sodium hydroxide solution by steel pipe, the PH of sodium hydroxide solution is 10-14, and soak time is 0.5-1 hour. Although if very fast with the too high sodium hydroxide solution N-process of concentration, but the pH value remaining in debris on steel pipe is also higher, can hinder step 5) in antirust treatment.
5) operation is antirust, and by steel pipe immersion in liquid preventives agent, the soak at room temperature time is 3-5 minute; Steel tube surface can be made to have the rust-proof effect in 1-2 week, be conducive to the antirust storage of inter process.
6) finely align, use 11 roller straighteners to align; Strong roller is more many more high by strong steel pipe precision, uses 11 roller straighteners can improve leveling effect and accelerate straightening process.
7) finished product crop end, by the excision end to end of steel pipe; Improving the quality of steel pipe, the damage being subject to due to the two ends of steel pipe in each step process aforementioned is the most serious, so the quality of steel pipe can be improved in the two ends of excision finished product.
8) high speed rubbing down, uses polishing and burnishing machine that steel pipe is carried out rubbing down; Steel tube surface carries out rubbing down to remove the inexpungible oxide skin of abovementioned steps and can also remove the debris remaining in steel tube surface, improve the original surface roughness of steel pipe, improve the service life of steel pipe.
9) defat, uses degreasing agent that steel pipe is carried out defat; All refueling machine oil due to processing equipment, and also have oily matter to exist in operating environment, defatting step can remove steel tube surface oils and fats, improves tube quality.
10) clean, use clean water steel pipe; Again can remove unnecessary degreasing agent with clean water steel pipe.
11) corrosion protection, is immersed in environment-friendly water-soluble antirust oil by steel pipe, and the soak at room temperature time is 0.5-1 hour. Improving the antirust ability of steel pipe, antirust time reaches half a year more than.
In the present embodiment, step 6) in 11 roller straighteners include 11 strong roller groups, each strong roller group is made up of the upper strong roller 1 cooperated and lower strong roller 2. Angle between 11 strong roller groups and its upper and lower strong roller 2 is respectively as follows: 26 degree, No. eight strong roller groups of 27 degree, No. seven strong roller groups of 28 degree, No. six strong roller groups of 29 degree, No. five strong roller groups of 30 degree, No. four strong roller groups of 31 degree, No. three strong roller groups of 32 degree, No. two strong roller groups of a strong roller group, 24 degree, No. ten strong roller groups of 25 degree, No. nine strong roller groups 23 degree and ride on Bus No. 11 rectifys roller group 22 degree. A number strong roller group is rectified roller group to ride on Bus No. 11 and is arranged in order. During work, steel pipe is located between strong roller 1 and lower strong roller 2.
In the present embodiment, step 4) in the pH value of sodium hydroxide solution be 11, soak time 0.5 hour.
Embodiment 2.
In the present embodiment improve solid drawn tube surface accuracy production technology, step 2) use mass fraction be 5% hydrochloric acid and remover mixing after steel pipe is processed, other steps are in the same manner as in Example 1. The mass fraction reducing hydrochloric acid can reduce volatility, reduces pollution and improves working environment. Mass fraction be 5% hydrochloric acid and remover refer to that the quality of hydrochloric acid accounts for the 5% of total solution, wherein the addition of remover can add as one sees fit.
Above content described in this specification is only illustration made for the present invention. Described specific embodiment can be made various amendment or supplements or adopt similar mode to substitute by those skilled in the art; without departing from the content of description of the present invention or surmount the scope that present claims book is defined, protection scope of the present invention all should be belonged to.
Claims (4)
1. the production technology improving solid drawn tube surface accuracy, it is characterised in that comprise the following steps:
1) heat treatment, sends into steel pipe in heat-treatment furnace, carries out heat treatment under 850-1000 degree Celsius, then carries out isothermal holding, and temperature retention time is 1.5-2.5 times of steel pipe wall thickness, and holding temperature is 500-700 degree Celsius; In minutes, thickness of steel pipe is in millimeter for temperature retention time;
2) chemical deoxidization skin, steel pipe to room temperature, is then soaked in the mixed liquor of hydrochloric acid that mass fraction is 15%-20% and remover, soaks half an hour by steel pipe air cooling; Mass fraction is the hydrochloric acid of 15%-20% and remover refers to that the quality of hydrochloric acid accounts for the 15%-20% of mixed liquor;
3) clean, use clean water;
4) neutralizing, be immersed in sodium hydroxide solution by steel pipe, the PH of sodium hydroxide solution is 10-14, and soak time is 0.5-1 hour;
5) operation is antirust, and by steel pipe immersion in liquid preventives agent, soak time is 3-5 minute;
6) finely align, use 11 roller straighteners to align;
7) finished product crop end, by the excision end to end of steel pipe;
8) high speed rubbing down, uses polishing and burnishing machine that steel pipe is carried out rubbing down;
9) defat, uses degreasing agent that steel pipe is carried out defat;
10) clean, use clean water steel pipe;
11) corrosion protection, is immersed in water-soluble anti-rust oil by steel pipe, and the soak at room temperature time is 0.5-1 hour.
2. the production technology of raising solid drawn tube surface accuracy according to claim 1, it is characterised in that: step 1) in, heat treatment temperature is 900 degrees Celsius, and holding temperature is 600 degrees Celsius, and temperature retention time is 2 times of pipe thickness.
3. the production technology of raising solid drawn tube surface accuracy according to claim 1 and 2, it is characterized in that: described step 6) in 11 roller straighteners include 11 strong roller groups, each strong roller group is made up of the upper strong roller cooperated and lower strong roller.
4. the production technology of raising solid drawn tube surface accuracy according to claim 1, it is characterised in that: described step 4) in the pH value of sodium hydroxide solution be 11, soak time 0.5 hour.
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| CN201210474926.5A CN102962290B (en) | 2012-11-21 | 2012-11-21 | Improve the production technology of solid drawn tube surface accuracy |
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| CN201210474926.5A CN102962290B (en) | 2012-11-21 | 2012-11-21 | Improve the production technology of solid drawn tube surface accuracy |
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| CN102962290A CN102962290A (en) | 2013-03-13 |
| CN102962290B true CN102962290B (en) | 2016-06-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103691774A (en) * | 2013-12-20 | 2014-04-02 | 鞍钢股份有限公司 | Straightening method of seamless pipe |
| CN103924054B (en) * | 2014-04-30 | 2015-11-11 | 重庆钢铁(集团)有限责任公司 | The aviation rust-proofing method of 20A steel pipe |
| CN104324974B (en) * | 2014-08-28 | 2016-06-29 | 攀钢集团成都钢钒有限公司 | The finely finishing method of titanium alloy seamless pipe |
| CN106623276B (en) * | 2016-12-30 | 2019-11-15 | 宁夏鸿亚精工科技有限公司 | The minimizing technology of spheroidizing rear bearing steel wool pipe surface iron scale |
| CN112108532A (en) * | 2020-09-07 | 2020-12-22 | 江阴商骏精密钢管有限公司 | Production process of steel pipe for high-pressure oil pipe |
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| US4070209A (en) * | 1976-11-18 | 1978-01-24 | Usui International Industry, Ltd. | Method of producing a high pressure fuel injection pipe |
| CN101823088A (en) * | 2010-01-29 | 2010-09-08 | 洛阳矿山机械工程设计研究院有限责任公司 | Overlarge-diameter high-precision ten-roller tube straightener |
| CN102010961A (en) * | 2010-09-27 | 2011-04-13 | 苏州奕欣特钢管业有限公司 | Process for producing steel tubes |
| CN102699102A (en) * | 2012-06-07 | 2012-10-03 | 重庆钢铁(集团)有限责任公司 | Production process method of small-caliber cold-drawing seamless steel tube used for boiler |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51119607A (en) * | 1975-04-14 | 1976-10-20 | Chugai Ro Kogyo Kaisha Ltd | A heating furnace for tubular rods |
| JP4172047B2 (en) * | 1997-04-22 | 2008-10-29 | 住友金属工業株式会社 | Manufacturing method of martensitic stainless steel seamless steel pipe |
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2012
- 2012-11-21 CN CN201210474926.5A patent/CN102962290B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4070209A (en) * | 1976-11-18 | 1978-01-24 | Usui International Industry, Ltd. | Method of producing a high pressure fuel injection pipe |
| CN101823088A (en) * | 2010-01-29 | 2010-09-08 | 洛阳矿山机械工程设计研究院有限责任公司 | Overlarge-diameter high-precision ten-roller tube straightener |
| CN102010961A (en) * | 2010-09-27 | 2011-04-13 | 苏州奕欣特钢管业有限公司 | Process for producing steel tubes |
| CN102699102A (en) * | 2012-06-07 | 2012-10-03 | 重庆钢铁(集团)有限责任公司 | Production process method of small-caliber cold-drawing seamless steel tube used for boiler |
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Address after: Tongxiang City, Jiaxing City, Zhejiang province 314503 Tu Dian Zhen Jing Shi Road No. 101 Applicant after: JIAXING XINJIYUAN STEEL PIPE MANUFACTURING CO., LTD. Address before: Tongxiang City, Jiaxing City, Zhejiang province 314503 Tu Dian Zhen Jing Shi Road No. 101 Applicant before: Jiaxing Xinjiyuan Steel Pipe Manufacturing Co., Ltd. |
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