CN102328186A - Production method of steel tube - Google Patents
Production method of steel tube Download PDFInfo
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- CN102328186A CN102328186A CN201110244499A CN201110244499A CN102328186A CN 102328186 A CN102328186 A CN 102328186A CN 201110244499 A CN201110244499 A CN 201110244499A CN 201110244499 A CN201110244499 A CN 201110244499A CN 102328186 A CN102328186 A CN 102328186A
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Abstract
The invention discloses a production method of a steel tube. The production method comprises the following steps: 1. making the tube: (1) centrifugally casting a hollow tube billet with the oxygen content of less than 30ppm; (2) machining the inner and outer surfaces of the hollow tube billet with the surface defect depth of not more than 0.2mm; (3) heating the machined hollow tube billet at the temperature of 1000-1350 DEG C; (4) jacking and rolling the heated tube billet to obtain a pipe fitting with the wall thickness of 80-160mm, the diameter of 500-1500mm and the length of 0.5-5m; and (5) cropping the top and end of the rolled pipe fitting and then finishing; and 2. after-treating the tube: (1) directly heating the steel tube without pretreatment at the heating rate in two stages: stage 1: heating the steel tube to 550-650 DEG C at the heating rate of 5-10 DEG C/min; and stage 2: heating the steel tube from 15-35 DEG C to complete austenitizing temperature of 35-40 DEG C (above A3); and performing heat preservation for 20-25 minutes, discharging and then cold-quenching; and (2) allowing the discharged steel tube to pass through a refrigerating gas area at the temperature of 10-25 DEG C within 10-20 minutes, then transferring the steel tube into a tempering furnace for heat preservation at the temperature of 260-350 DEG C for 50-80 minutes, then discharging the steel tube out of the furnace, and air-cooling to room temperature so as to finally obtain the steel tube with the grain size of 11-12 grade.
Description
Technical field
The present invention relates to a kind of steel tube producing method, belong to the control part manufacture field of steel.
Background technology
CN200910134664 discloses a kind of seamless pipe casting model frame, is made up of the sand mold of casting model frame, it is characterized in that: in the sand mold of casting model frame, be embedded with steel pipe.Advantage is: be employed in the sand mold of casting model frame and be embedded with steel pipe, during casting, sand mold is disintegrated, and steel pipe stays in foundry goods, forms the foundry goods oil circuit, has overcome original oil leakage phenomenon.
CN101538623 discloses the manufacturing process of the thin brilliant heat resisting steel steel pipe of a kind of T/P91.92, may further comprise the steps: 1) selected steel material; 2) blast furnace slightly refines: adopt top bottom blowing technology; 3) basic furnace takes off S, P; 4) electric furnace refining: the process of in electric furnace, smelting: application of vacuum, Argon stir, heat temperature control, microalloying; 5) vacuum drying oven outgases and oozes alloy part: vacuum deaeration in vacuum drying oven, decarburization, dehydrogenation, denitrogenation; 6) finish rolling: adopt continuous casting, steel ingot blocks is constantly rolled back and forth.The present invention can improve steel degree of purity, remove and harmfully to be mingled with, to make chemical composition indicators of trace elements to meet design requirement; Objectionable impurities such as S.P.N are effectively controlled; The grain size of steel reach 9 grades and more than; The impact flexibility of steel and creep rupture strength satisfy supercritical generating boiler design parameter request.
The crystal grain of above preparation method's gained is thick, and last handling process is single, can not effectively control crystal grain, and is simultaneously less demanding for blank, do not carry out anti-corrosion treatment, and workpiece is difficult to adapt to the harshness application of working condition.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide a kind of production technology of steel pipe.
Described production method does,
One, tubulation step: (1) centrifugal casting hollow bloom; Hollow bloom oxygen content be lower than 30ppm
(2) surfaces externally and internally to said hollow bloom carries out machined; The blemish degree of depth is smaller or equal to 0.2mm;
(3) the said hollow bloom after the machined is heated, heating-up temperature is 1000-1350 ℃; (4) the said pipe after the heating is carried out the rolling processing of push pipe, make the pipe fitting of wall thickness 80-160mm, diameter 500-1500mm and length 0.5-5m; (5) the said pipe fitting after the rolling processing of push pipe is carried out crop, back-end crop, finishing;
Two, steel pipe last handling process: (1) need not preliminary treatment; Directly steel pipe is heated to above 35-40 ℃ of complete austenitizing temperature A3, temperature retention time is 20-25 minute, the back water hardening of coming out of the stove; Wherein heating rate is the two-stage: phase I 5-10 degree/min; Be warmed up to 550-650 ℃, second stage 15-35 degree is warmed up to the above 35-40 of A3 ℃;
(2) come out of the stove after through 10-25 ℃ refrigerant gas zone, through the time be 10-20mi n, reenter the tempering furnace insulation then and handle, temperature is 260-350 ℃, temperature retention time is 50-80 minute, the air cooling of coming out of the stove then is to room temperature, grain size is the 11-12 level.
Described centrifugal casting is to be that the inclination angle is to carry out on the tilting centrifugal casting machine of 20-25 degree at the rotation of casting mold and horizontal sextant angle.
Also comprise anti-corrosion treatment.
Said anti-corrosion treatment is covered for applying anticorrosive coating or electrolytic coating or electroless plating.
The composition of said steel pipe is: C 0.2～0.25, Mo 1.0～1.5, Si 0.3～0.4, Ti 0.02～0.03, B 0.002～0.003, V 0.06～0.10,0.009＜N≤0.013, surplus are Fe and unavoidable impurities.
The prepared steel pipe crystal grain of the present invention is tiny, and yield strength can reach 300-450Mpa, good corrosion resistance.
Outstanding advantage of the present invention is near general A 3 lines, not heat, but the interval of uniform temperature above that, thereby form more tiny crystal grain easily; Because crystal grain improves a rank; Technology own is very difficult, moreover does not just want to improve and improve, especially high grain size;
More outstanding advantage is not through general quenching, but realizes that through the air band of lower temperature region it helps industrialized continuous production and the general airborne exposure that prevents to get into quenching liquid.
The specific embodiment
Embodiment one
The composition of steel pipe is that (weight percentage): C 0.2, Mo 1.0, Si 0.3, Ti 0.02, B 0.002, V 0.06, N 0.013, surplus are Fe and unavoidable impurities.
Concrete technology is:
One, tubulation step: (1) is that the inclination angle is the tilting centrifugal casting machine centrifugal casting hollow bloom of 20-25 degree at the rotation and the horizontal sextant angle of casting mold; Hollow bloom oxygen content 29.5ppm (2) surfaces externally and internally of said hollow bloom is carried out machined; Blemish degree of depth 0.2mm; (3) the said hollow bloom after the machined is heated, heating-up temperature is 1000 ℃; (4) the said pipe after the heating is carried out the rolling processing of push pipe, make the pipe fitting of wall thickness 80mm, diameter 500mm and length 0.5m; (5) the said pipe fitting after the rolling processing of push pipe is carried out crop, back-end crop, finishing;
Two, steel pipe last handling process: (1) need not preliminary treatment; Directly steel pipe is heated to complete austenitizing temperature A 3 above 35 ℃, temperature retention time is 20 minutes, the back water hardening of coming out of the stove; Wherein heating rate is the two-stage: phase I 5 degree/min; Be warmed up to 550 ℃, second stage 15 degree are warmed up to above 35 ℃ of A3;
(2) come out of the stove after through 10 ℃ refrigerant gas zone, through the time be 10min, reenter the tempering furnace insulation then and handle, temperature is 260 ℃, temperature retention time is 50 minutes, the air cooling of coming out of the stove then is to room temperature, grain size is 11 grades.
Pipe fitting to gained carries out preservative treatment, and anti-corrosion treatment is covered for applying anticorrosive coating or electrolytic coating or electroless plating.
Example 2:
The composition of steel pipe is that (weight percentage): C 0.25, Mo 1.5, Si 0.4, Ti 0.03, B 0.003, V 0.10, N 0.009, surplus are Fe and unavoidable impurities.
One, tubulation step: (1) centrifugal casting hollow bloom; Hollow bloom oxygen content be lower than 30ppm (2) surfaces externally and internally of said hollow bloom carried out machined; The blemish degree of depth is smaller or equal to 0.2mm; (3) the said hollow bloom after the machined is heated, heating-up temperature is 1000-1350 ℃; (4) the said pipe after the heating is carried out the rolling processing of push pipe, make the pipe fitting of wall thickness 80-160mm, diameter 500-1500mm and length 0.5-5m; (5) the said pipe fitting after the rolling processing of push pipe is carried out crop, back-end crop, finishing;
Two, steel pipe last handling process: (1) need not preliminary treatment; Directly steel pipe is heated to above 35-40 ℃ of complete austenitizing temperature A3, temperature retention time is 20-25 minute, the back water hardening of coming out of the stove; Wherein heating rate is the two-stage: phase I 5-10 degree/min; Be warmed up to 550-650 ℃, second stage 15-35 degree is warmed up to the above 35-40 of A3 ℃;
(2) come out of the stove after through 10-25 ℃ refrigerant gas zone, through the time be 10-20min, reenter the tempering furnace insulation then and handle; Temperature is 260-350 ℃, and temperature retention time is 50-80 minute, and the air cooling of coming out of the stove then is to room temperature; Grain size is the 11-12 level, and yield strength can reach 300-450Mpa.
Described centrifugal casting is to be that the inclination angle is to carry out on the tilting centrifugal casting machine of 20-25 degree at the rotation of casting mold and horizontal sextant angle.
Also comprise anti-corrosion treatment, said anti-corrosion treatment is covered for applying anticorrosive coating or electrolytic coating or electroless plating, is metal level as applying sacrifices such as epoxy zinc-enriched paint or electro deposited zinc.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technological process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technological process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technological process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (5)
1. steel tube producing method is characterized in that: described production method does,
One, tubulation step: (1) centrifugal casting hollow bloom; Hollow bloom oxygen content be lower than 30ppm (2) surfaces externally and internally of said hollow bloom carried out machined; The blemish degree of depth is smaller or equal to 0.2mm; (3) the said hollow bloom after the machined is heated, heating-up temperature is 1000-1350 ℃; (4) the said pipe after the heating is carried out the rolling processing of push pipe, make the pipe fitting of wall thickness 80-160mm, diameter 500-1500mm and length 0.5-5m; (5) the said pipe fitting after the rolling processing of push pipe is carried out crop, back-end crop, finishing;
Two, steel pipe last handling process: (1) need not preliminary treatment; Directly steel pipe is heated to above 35-40 ℃ of complete austenitizing temperature A3, temperature retention time is 20-25 minute, the back water hardening of coming out of the stove; Wherein heating rate is the two-stage: phase I 5-10 degree/min; Be warmed up to 550-650 ℃, second stage 15-35 degree is warmed up to the above 35-40 of A3 ℃;
(2) come out of the stove after through 10-25 ℃ refrigerant gas zone, through the time be 10-20min, reenter the tempering furnace insulation then and handle, temperature is 260-350 ℃, temperature retention time is 50-80 minute, the air cooling of coming out of the stove then is to room temperature, grain size is the 11-12 level.
2. production method according to claim 1 is characterized in that described centrifugal casting is is that the inclination angle is to carry out on the tilting centrifugal casting machine of 20-25 degree at the rotation of casting mold and horizontal sextant angle.
3. production method according to claim 2 is characterized in that also comprising anti-corrosion treatment.
4. production method according to claim 3 is characterized in that said anti-corrosion treatment is to apply anticorrosive coating or electrolytic coating or electroless plating to cover.
5. according to the described production method of claim 1-5, it is characterized in that the composition of said steel pipe is: C0.2～0.25, Mo 1.0～1.5, Si 0.3～0.4, Ti 0.02～0.03, B 0.002～0.003, V0.06～0.10,0.009＜N≤0.013, surplus are Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110244499A CN102328186A (en) | 2011-08-24 | 2011-08-24 | Production method of steel tube |
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|---|---|---|---|
| CN201110244499A CN102328186A (en) | 2011-08-24 | 2011-08-24 | Production method of steel tube |
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| CN102328186A true CN102328186A (en) | 2012-01-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108673148A (en) * | 2018-05-28 | 2018-10-19 | 广东水电二局股份有限公司 | The organisation of working and its processing method of inside and outside double layer anticorrosive fabricating drainpipe made from stainless steel |
| CN112453344A (en) * | 2020-11-26 | 2021-03-09 | 江苏联峰能源装备有限公司 | Production method of high-pressure boiler steel pipe |
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2011
- 2011-08-24 CN CN201110244499A patent/CN102328186A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108673148A (en) * | 2018-05-28 | 2018-10-19 | 广东水电二局股份有限公司 | The organisation of working and its processing method of inside and outside double layer anticorrosive fabricating drainpipe made from stainless steel |
| CN112453344A (en) * | 2020-11-26 | 2021-03-09 | 江苏联峰能源装备有限公司 | Production method of high-pressure boiler steel pipe |
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Application publication date: 20120125 |