CN101691629A - Method for manufacturing seamless steel tubes - Google Patents
Method for manufacturing seamless steel tubes Download PDFInfo
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- CN101691629A CN101691629A CN200910034538A CN200910034538A CN101691629A CN 101691629 A CN101691629 A CN 101691629A CN 200910034538 A CN200910034538 A CN 200910034538A CN 200910034538 A CN200910034538 A CN 200910034538A CN 101691629 A CN101691629 A CN 101691629A
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Abstract
The invention discloses a method for manufacturing seamless steel tubes, which is used for manufacturing seamless steel tubes made of ferritic stainless steel. The method is characterized by comprising the following steps: 1) carrying out first pickling on blanks; 2) carrying out polishing, combined drawing and rolling and oil removal on the blanks undergoing pickling; 3) judging whether the finished product requirements are satisfied, if not, carrying out solution heat treatment, straightening and pickling on the intermediate products and repeating the step 2; 4) if so, carrying out solution heat treatment, straightening and fixed cutting on the finished products; and 5) pickling the finished products. The temperature is controlled between 770 DEG C and 790 DEG C when carrying out solution heat treatment on the finished products. The method solves the problems in the prior art, saves energy and has simple processes.
Description
Technical field
The present invention relates to a kind of manufacture method of weldless steel tube, particularly relate to a kind of manufacture method of ferritic stainless seamless steel tube.
Background technology
Weldless steel tube is a kind of rectangular steel that hollow section, periphery do not have seam that have.Weldless steel tube is because of having hollow section, so in a large number as the pipeline of conveyance fluid, as the pipeline of transfer oil, Sweet natural gas, coal gas, water and some solid materials etc.Weldless steel tube is compared with solid steel such as round steel, when the bending resistance twisting strength was identical, weight was lighter, was a kind of economic cross-section steel, also be widely used in manufacturing structure spare and mechanical component, as steel scaffolding of using in oil drill rocker, truck drive shaft, bicycle frame and the building operation etc., make ring-shaped work pieces with weldless steel tube, can improve material use efficiency, simplify manufacturing process, economical with materials and machining period as rolling bearing lasso, screw block cover etc., are extensively made with weldless steel tube at present.Weldless steel tube still is various conventional weapon indispensable material, and gun barrel, gun barrel etc. is all wanted weldless steel tube manufacturing.
Ferritic stainless steel is general because its excellent corrosion resistance nature often is used to make weldless steel tube.Ferritic stainless steel also possesses weathering resistance, high strength and magnetic characteristics in addition, especially be fit to use and outside coastal and manufacturing district palace, adorn material usefulness, but the making method of traditional weldless steel tube is made ferritic stainless seamless steel tube, not only waste energy, and complex procedures.
Summary of the invention
For overcoming above-mentioned shortcoming, the object of the present invention is to provide the manufacture method of a kind of save energy, the simple weldless steel tube of operation.
In order to reach above purpose, the technical solution used in the present invention is: a kind of manufacture method of weldless steel tube, be used to make ferritic stainless seamless steel tube, and comprise following steps:
1) blank is carried out the pickling first time;
2) blank to pickling carries out reconditioning, rolls and pull out associating, deoil;
3) judge whether to satisfy the finished product requirement, as otherwise carry out centre product solution heat treatment, aligning, pickling and repeat the 2nd the step;
4) then carrying out finished product solution heat treatment, aligning and finished product in this way cuts surely;
5) finished product is carried out pickling;
The temperature of described finished product solution heat treatment is between 770 ℃ to 790 ℃.
As a preferred embodiment of the present invention, described ferritic stainless steel comprises:
Weight percent is to be no more than 0.02% C;
Weight percent is the Cr of 23.0-27.0%;
Weight percent is to be no more than 0.25% N;
Weight percent is to be no more than 0.75% Ni;
Weight percent is to be no more than 0.15% Mn;
Weight percent is to be no more than 0.030% S;
Weight percent is to be no more than 0.04% P;
Weight percent is to be no more than 1.00% Si;
And the Fe of surplus.
As a preferred embodiment of the present invention, described rolling pulled out in the combination treatment, rolls the employing warm-rolling, takes 300～400 ℃ of line induction heating, takes the lead afterwards and soldering tip and being lubricated, and then pull out in small deformation amount λ=1.05～1.35.
As a preferred embodiment of the present invention, described blank is carried out also having a materiology step before the acid pickling step first time, described materiology step comprises dimensional inspection, surperficial check, quality test, Chemical Composition check.
As a preferred embodiment of the present invention, also has an inspection after construction step after the described finished product acid-washing step.
As a preferred embodiment of the present invention, described inspection after construction comprises surface check, hydraulic pressure detection, eddy current test, UT (Ultrasonic Testing), intergranular corrosion test, grain fineness number test, tensile test, flaring test, flattening test, hardness test, analysis of carbon and sulfur.
Owing to adopted technique scheme, make the present invention have the following advantages: through repeatedly reconditioning, roll pull out associating, deoil, operation such as solution heat treatment, aligning, pickling, product quality guarantees, and well avoided ferritic stainless steel and be not suitable for thermal treatment hardened defective.
Description of drawings
Accompanying drawing 1 is the schema of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby protection scope of the present invention is made more explicit defining so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that.
Referring to accompanying drawing 1, materiology S01 refers to raw material is tested, and comprises dimensional inspection, surperficial check, quality test, Chemical Composition check.
Blank is carried out pickling first time S02 be meant that the use pickle solution carries out pickling to the steel pipe raw material, the oxide compound on the eccysis raw material is convenient to following process.
Reconditioning S03 is that the fault location on the raw material is polished off, and is convenient to following process equipment weldless steel tube is handled, and reconditioning will be carried out once at least, also can carry out repeatedly reconditioning.
Roll and pull out associating S05, be meant by using blank is handled, roll the employing warm-rolling, temperature 300-400 ℃ of line induction heating, small deformation amount λ=1.05-1.35, the processing mode that adopts soldering tip then or take the lead, through lubricated, after lubricated, pull out again again, make raw material form the method for steel pipe type.Because the work hardening of material obtains certain answer during warm-rolling, compares with cold rolling, YIELD STRENGTH is low, and the plasticity height does not have the hot rolled shortcoming again, therefore is subjected to generally paying attention to.Warm-rolling generally carries out on cold-rolling equipment.Before entering the rolling deformation district, workpiece is heated to 300-400 ℃, is rolled then with induction heater.The metal that some plasticity are low, intensity is high also might obtain precision work by warm-rolling.Through warm-rolling, make tube quality good, the wall thickness accuracy and the surface quality of steel pipe are higher, reduce yield strength and resistance to deformation, improve plasticity, unit elongation is about cold rolling 2-3 doubly,, saved the energy, improve the first-time qualification rate of steel, and production efficiency, cost in follow-up, saved greatly
Warm-rolling be applicable to processing some plasticity is low under normal temperature condition, yield strength is high, resistance to deformation is big, be not suitable for adopting cold rolling metal and alloy.Though also being used for processing those can be cold rolling, metal that production efficiency is low, rolling process is many, energy consumption is big and alloy are as rolled iron aluminium alloy, stainless steel etc.
The S06 that deoils often needs to add lubricating oil, cold rolling wet goods subsidiary material because roll to pull out among the associating S05, so need one these auxiliary oil are removed, make things convenient for subsequent production.
Middle product solution heat treatment S07 referred to weldless steel tube heating and insulation regular hour.
Aligning S08 is meant the rectification that the shape defect to weldless steel tube carries out, heat-treat after pulling out joint step rolling, weldless steel tube can produce certain deformation, so need align S07 to weldless steel tube, method for aligning can be gag press straightening, roll straightening (comprising straight roller aligning and cross roll aligning), tension straightening and stretch-bend leveller.
Pickling S09 refers to utilize acid solution to remove the method for its lip-deep oxide skin and corrosion thing to the weldless steel tube of producing.
Finished product solution heat treatment S10 is heated to finished product between 770 ℃ to 790 ℃, and optimum temps is 780 ℃, after the maintenance regular hour, is cooled fast to the operation of room temperature.The product solution heat treatment temperature is a key point among the present invention herein, the steel grade that is fit to the present invention relates to processing.After middle product solution heat treatment step, the hardness of weldless steel tube can be lower, but have very high work hardening capacity and good wear resistance and toughness, not only be convenient to follow-up operation, and hardness can be strengthened constantly also in the process of following process.This step make the steel pipe composition all with change, crystal grain thinning eliminates stress, and has improved toughness and extensibility, improves mechanical property, comprehensive mechanical performance is good.Carry out tissue for next process and prepare, more can reach bright and clean surface quality after the pickling
It is the size that weldless steel tube is cut into requirement that finished product is cut S11 surely.
The S12 of pickling for the second time utilizes acid solution to remove the method for its lip-deep oxide skin and corrosion thing to weldless steel tube, because after finished product is cut S11 surely, may still can cause damage,, guarantee the quality of finished product so also need at last to carry out this step to weldless steel tube.
Inspection after construction S13 tests to the weldless steel tube that production is finished, and the content of inspection after construction can be checked for the surface, hydraulic pressure detection, eddy current test, UT (Ultrasonic Testing), intergranular corrosion test, grain fineness number test, tensile test, flaring test, flattening test, hardness test, analysis of carbon and sulfur.
Introduce the making processes of ferrite weldless steel tube in detail below in conjunction with Fig. 1, need carry out materiology S01 before the raw material production of weldless steel tube, be used to guarantee the quality of raw material, guarantee the yield of subsequent production; Carry out pickling first time S02 through the qualified weldless steel tube raw material of materiology S01, be used for the oxide compound on the eccysis raw material, be convenient to following process; Through beginning step reconditioning S03 successively behind the S02 of pickling for the first time, roll and pull out associating S05, S06 deoils, at this moment need to judge whether the weldless steel tube of producing has reached the requirement of finished product, if do not reach the requirement of finished product, then carry out centre product solution heat treatment S07, aligning S08, pickling S09, and then carry out reconditioning S03, roll and pull out associating S05, and judge whether to reach the finished product requirement, if reached the requirement of finished product, then carry out finished product solution heat treatment S10 successively, aligning S08, finished product is cut S11 surely, finished product acid-washing S12, what need mention especially is, can set circulation according to the needs of producing and repeat repeatedly middle product solution heat treatment S07, aligning S08, pickling S09, reconditioning S03, roll and pull out associating S05, the round-robin number of times can be set difference according to different raw materials with different sizes, after setting the fixed cycle index, follow-up industrial production just can be produced according to the cycle index of setting, and do not need manually to judge, save manpower, also be beneficial to industrial linking up with quick; Whether after completed weldless steel tube finished product pickling S12, can set as required needs to carry out inspection after construction S13, and the project that forms product check S13 also can be set according to different needs.
What need mention especially is, the raw material in the present embodiment is a ferritic stainless steel, and it comprises:
Weight percent is to be no more than 0.02% C;
Weight percent is the Cr of 23.0-27.0%;
Weight percent is to be no more than 0.25% N;
Weight percent is to be no more than 0.75% Ni;
Weight percent is to be no more than 0.15% Mn;
Weight percent is to be no more than 0.030% S;
Weight percent is to be no more than 0.04% P;
Weight percent is to be no more than 1.00% Si;
And the Fe of surplus.
Use ferritic stainless steel, make weldless steel tube have high corrosion resistance nature, and possess weathering resistance, high strength and be magnetic.
By above-mentioned embodiment, be not difficult to find out that the present invention is the manufacture method of a kind of save energy, the simple weldless steel tube of operation.
The above; it only is the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.
Claims (6)
1. the manufacture method of a weldless steel tube is used to make ferritic stainless seamless steel tube, it is characterized in that comprising following steps:
1) blank is carried out the pickling first time;
2) blank to pickling carries out reconditioning, rolls and pull out associating, deoil;
3) judge whether to satisfy the finished product requirement, as otherwise carry out centre product solution heat treatment, aligning, pickling and repeat the 2nd the step;
4) then carrying out finished product solution heat treatment, aligning and finished product in this way cuts surely;
5) finished product is carried out pickling;
The temperature of described finished product solution heat treatment is between 770 ℃ to 790 ℃.
2. the manufacture method of a weldless steel tube as claimed in claim 1, it is characterized in that: described ferritic stainless steel comprises:
Weight percent is to be no more than 0.02% C;
Weight percent is the Cr of 23.0-27.0%;
Weight percent is to be no more than 0.25% N;
Weight percent is to be no more than 0.75% Ni;
Weight percent is to be no more than 0.15% Mn;
Weight percent is to be no more than 0.030% S;
Weight percent is to be no more than 0.04% P;
Weight percent is to be no more than 1.00% Si;
And the Fe of surplus.
3. the manufacture method of weldless steel tube according to claim 2, it is characterized in that: described rolling pulled out in the combination treatment, rolls the employing warm-rolling, takes 300～400 ℃ of line induction heating, small deformation amount λ=1.05～1.35.Take the lead afterwards or soldering tip and being lubricated, and then pull out.
4. the manufacture method of weldless steel tube according to claim 3, it is characterized in that: described blank is carried out also having a materiology step before the acid pickling step first time, described materiology step comprises dimensional inspection, surperficial check, quality test, Chemical Composition check.
5. the manufacture method of weldless steel tube according to claim 4 is characterized in that: also have an inspection after construction step after the described finished product acid-washing step.
6. the manufacture method of weldless steel tube according to claim 5 is characterized in that: described inspection after construction comprises surface check, hydraulic pressure detection, eddy current test, UT (Ultrasonic Testing), intergranular corrosion test, grain fineness number test, tensile test, flaring test, flattening test, hardness test, analysis of carbon and sulfur.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100345383A CN101691629B (en) | 2009-09-17 | 2009-09-17 | Method for manufacturing seamless steel tubes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100345383A CN101691629B (en) | 2009-09-17 | 2009-09-17 | Method for manufacturing seamless steel tubes |
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| CN101691629A true CN101691629A (en) | 2010-04-07 |
| CN101691629B CN101691629B (en) | 2012-04-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102465200A (en) * | 2010-11-05 | 2012-05-23 | 苏州贝思特金属制品有限公司 | Manufacture method for seamless steel tube |
| CN102463270A (en) * | 2010-11-05 | 2012-05-23 | 苏州贝思特金属制品有限公司 | Manufacture method for seamless steel pipe |
| CN102606810A (en) * | 2012-03-21 | 2012-07-25 | 苏州贝思特金属制品有限公司 | Manufacture method of low carbon nickel chrome molybdenum niobium alloy stainless steel seamless steel tube |
| CN106623484A (en) * | 2016-12-30 | 2017-05-10 | 宁夏鸿亚特种钢管有限公司 | Manufacturing method for bearing steel stainless steel pipe |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1542156A (en) * | 2003-04-30 | 2004-11-03 | 王光煌 | High-silicon high-aluminium ferrite stainless steel and its application in preparation of heat-resisting steel pipe |
| CN101220443B (en) * | 2008-01-22 | 2010-12-08 | 江苏长盈不锈钢管有限公司 | Stainless steel weldless steel tube for ship and producing technique |
-
2009
- 2009-09-17 CN CN2009100345383A patent/CN101691629B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102465200A (en) * | 2010-11-05 | 2012-05-23 | 苏州贝思特金属制品有限公司 | Manufacture method for seamless steel tube |
| CN102463270A (en) * | 2010-11-05 | 2012-05-23 | 苏州贝思特金属制品有限公司 | Manufacture method for seamless steel pipe |
| CN102606810A (en) * | 2012-03-21 | 2012-07-25 | 苏州贝思特金属制品有限公司 | Manufacture method of low carbon nickel chrome molybdenum niobium alloy stainless steel seamless steel tube |
| CN106623484A (en) * | 2016-12-30 | 2017-05-10 | 宁夏鸿亚特种钢管有限公司 | Manufacturing method for bearing steel stainless steel pipe |
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|---|---|
| CN101691629B (en) | 2012-04-25 |
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Inventor after: Liu Chao Inventor before: Wang Qingming |
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Address after: 215500 Changshou City Xinzhuang (Yang Yuan) Industrial Park, Changshou City, Jiangsu Patentee after: Suzhou fitok metal products Co., Ltd. Address before: 215562 Changsheng Road, Yangyuan Industrial Park, Xinzhuang Town, Changshou City, Jiangsu Province, No. 1 Patentee before: Suzhou Best Metal Products Co., Ltd. |
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