CN102294571A - Method for manufacturing high-temperature and high-pressure steel pipe - Google Patents
Method for manufacturing high-temperature and high-pressure steel pipe Download PDFInfo
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- CN102294571A CN102294571A CN2010102129856A CN201010212985A CN102294571A CN 102294571 A CN102294571 A CN 102294571A CN 2010102129856 A CN2010102129856 A CN 2010102129856A CN 201010212985 A CN201010212985 A CN 201010212985A CN 102294571 A CN102294571 A CN 102294571A
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Abstract
The invention discloses a method for manufacturing a high-temperature and high-pressure steel pipe. The method comprises the following steps of: cutting strips; milling edges; pre-bending to eliminate plate end straight edges; bending; molding; closing joints and pre-welding: closing joints on the connection end of the steel pipe; internal welding: welding the inside of the connection end of the steel pipe; external welding: welding the outside of the connection end of the steel pipe; pipe end processing: processing the pipe end flat head of the steel pipe; strengthening, wherein the straightness allowed by a standard can be reached by strengthening; rectifying: forcibly and accurately shaping with an O-shaped mold; fault detection; thermally treating the entire steel pipe after fault detection is qualified; aligning and rectifying once again; end trimming: smoothening the tip of the steel pipe; final detection: detecting the steel pipe; and warehousing: warehousing qualified steel pipes. Major process measures for preventing quenching of a heat affected zone comprise adopting welding small coil energy, reducing high-temperature retention time and performing thermal treatment after welding, so that the possibility of welding cracks is greatly lowered and eliminated.
Description
Technical field
The present invention relates to a kind of manufacture method of HTHP steel pipe, particularly relate to the manufacture of steel pipe of ASTMA387Gr.11CL.2 steel.
Background technology
Along with the development of China's HTHP pressure vessel, HTHP steel pipe (especially the ASTMA387Gr.11CL.2 HTHP is with managing) uses in pressure vessel.This material standard is U.S.'s boiler and pressure vessel standard, and the invar pipe needs high temperature high voltage resistant, and to material and welding requirements height, this type of steel pipe of China is mainly from Korea S and Italian import at present; In addition, the yield strength 〉=310Mpa of the HTHP steel pipe of ASTMA387.11CL.2GL.2 material, tensile strength is 515-690Mpa.Though intensity and hardness are not high, welding and process HTHP very likely crack, and the moulding difficulty increases along with plate thickness and strengthens, and mainly is the difficulty of pre-bending bending joint close and integer; Thereby welding causes carbon equivalent higher because of alloying component is higher, and solderability is reduced, and steel pipe is also increased with thickness by HTHP and is easy to generate crackle.
Summary of the invention
In order to solve the technical problem that might crack through the high temperature high-pressure stage after prior art HTHP pipe, the welding, the invention provides a kind of manufacture method of HTHP steel pipe.
The present invention solves above-mentioned technical problem by following technical proposals: a kind of manufacture method of HTHP steel pipe is characterized in that it may further comprise the steps:
Step 1: open bar, a block plate is carried out perpendicular cuts;
Step 2: mill the limit, to the dual-side of steel plate by a Milling Process;
Step 3: pre-bending, pre-bending are to eliminate plate end straight flange, earlier the side of steel plate are bent circular arc, repeatedly are bent to the circular arc requirement with the standard patrix again;
Step 4: bending tentatively is converted into tubular with steel plate;
Step 5: moulding, the steel plate formation steel pipe with tubular compresses the steel pipe whole circumference during moulding, makes even along the residual stress on thickness of steel pipe and the circumferencial direction;
Step 6: the joint close prewelding, carry out joint close with the link of steel pipe;
Step 7: interior weldering, interior weldering is welded the link inside of steel pipe;
Step 8: outside weld, outside weld is welded the link outside of steel pipe;
Step 9: pipe end processing, carry out the pipe end tack processing of steel pipe;
Step 10: aligning needs through just reaching the linearity that standard allows behind the aligning;
Step 11: finishing, force accurate shaping with O shape mould;
Step 12: flaw detection;
Step 13: detect a flaw and carry out whole steel pipe heat treatment after qualified; Positive and negative 15 degree of heat treatment temperature 680 degree, 25-2 hour 35 minutes 2 hours time;
Step 14: alignment finishing more again;
Step 15: repair end, make the termination of steel pipe level and smooth;
Step 10 six: the final detection, steel pipe is detected;
Step 10 seven: warehouse-in, steel pipe detects warehousing after passing and deposits.
Preferably, monofilament automatic submerged arc welding is adopted in described interior weldering.
Preferably, the automatic submerged arc welding of monofilament multilayer multiple tracks is adopted in described outside weld.
Preferably, described final detection comprises that ultrasound examination, X ray detection, magnetic detection, Non-Destructive Testing, hydraulic pressure detect and take advantage of the magnetic detection.
Positive progressive effect of the present invention is: the present invention prevents that the main technique measure of quenching of heat affected area from being to adopt the little heat input of welding, reduces high-temperature residence time, and postwelding carries out bulk heat treatmet to steel pipe and reduces and exempt the weld crack possibility greatly; The measure that the present invention prevents to produce the weld seam longitudinal crack is to carry out pre-finishing before control pre-bending bending circularity and the interior weldering prerequisite.
Description of drawings
Fig. 1 is the flow chart of one embodiment of the invention.
The specific embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The manufacture method of HTHP steel pipe of the present invention is used to make the HTHP steel pipe of ASTMA387.11CL.2GL.2 material.As shown in Figure 1, the manufacture method of HTHP steel pipe of the present invention may further comprise the steps:
Step 1: open bar, steel plate is carried out perpendicular cuts;
Step 2: mill the limit, to the dual-side of steel plate by a Milling Process;
Step 3: pre-bending, pre-bending mainly are to eliminate plate end straight flange, and the side of steel plate is bent circular arc.
Step 4: bending tentatively is converted into tubular with steel plate; Emphasis control bending circularity, circularity generally is controlled in 20 millimeters.
Step 5: moulding, the steel plate of tubular is formed steel pipe, during moulding the steel pipe whole circumference is compressed, make even along the residual stress on thickness of steel pipe and the circumferencial direction, can be reduced to the stress of shape steel tube on the one hand, provide convenience for postorder joint close prewelding on the other hand;
Step 6: the joint close prewelding, carry out joint close with the link of steel pipe; Joint close preheat temperature 200 is spent to 300 degree.
Step 7: interior weldering, interior weldering is welded the link inside of steel pipe, and monofilament automatic submerged arc welding is adopted in interior weldering, shaping and the weld seam longitudinal crack occurs again after avoiding all having welded; Weld preheating welded seam area, preheating width are in 100 millimeters on the weld seam both sides, and preheat temperature 200 is spent to 300 degree.
Step 8: outside weld, outside weld is welded the link outside of steel pipe, and the automatic submerged arc welding of monofilament multilayer multiple tracks is adopted in outside weld; Weld preheating welded seam area, preheating width are in 100 millimeters on the weld seam both sides, and preheat temperature 200 is spent to 300 degree.
Step 9: pipe end processing, carry out the pipe end tack processing of steel pipe;
Step 10: aligning needs through just reaching the linearity that standard allows behind the aligning;
Step 11: finishing, force accurate shaping with O shape mould, to reach higher circularity and straight degree;
Step 12: flaw detection;
Step 13: detect a flaw and carry out whole steel pipe heat treatment after qualified; Positive and negative 15 degree of heat treatment temperature 680 degree, 25-2 hour 35 minutes 2 hours time;
Step 14: alignment finishing more again;
Step 15: repair end, make the termination of steel pipe level and smooth;
Step 16: the final detection, steel pipe to be detected, the final detection comprises ultrasound examination, X ray detection, magnetic detection, Non-Destructive Testing, hydraulic pressure detection and takes advantage of magnetic to detect;
Step 17: warehouse-in, steel pipe detects warehousing after passing and deposits.
The present invention prevents that the main technique measure of quenching of heat affected area from being to adopt the little heat input of welding, reduces high-temperature residence time, and the postwelding steel pipe integral is heat-treated, and reduces and exempt the weld crack possibility greatly.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these embodiments.Therefore, protection scope of the present invention is limited by appended claims.
Claims (4)
1. the manufacture method of a HTHP steel pipe is characterized in that, it may further comprise the steps:
Step 1: open bar, a block plate is carried out perpendicular cuts;
Step 2: mill the limit, to the dual-side of steel plate by a Milling Process;
Step 3: pre-bending, pre-bending are to eliminate plate end straight flange, earlier the side of steel plate are bent circular arc, repeatedly are bent to the circular arc requirement with the standard patrix again;
Step 4: bending tentatively is converted into tubular with steel plate;
Step 5: moulding, the steel plate formation steel pipe with tubular compresses the steel pipe whole circumference during moulding, makes even along the residual stress on thickness of steel pipe and the circumferencial direction;
Step 6: the joint close prewelding, carry out joint close with the link of steel pipe;
Step 7: interior weldering, interior weldering is welded the link inside of steel pipe;
Step 8: outside weld, outside weld is welded the link outside of steel pipe;
Step 9: pipe end processing, carry out the pipe end tack processing of steel pipe;
Step 10: aligning needs through just reaching the linearity that standard allows behind the aligning;
Step 11: finishing, force accurate shaping with O shape mould;
Step 12: flaw detection;
Step 13: detect a flaw and carry out whole steel pipe heat treatment after qualified; Positive and negative 15 degree of heat treatment temperature 680 degree, 25-2 hour 35 minutes 2 hours time;
Step 14: alignment finishing more again;
Step 15: repair end, make the termination of steel pipe level and smooth;
Step 10 six: the final detection, steel pipe is detected;
Step 10 seven: warehouse-in, steel pipe detects warehousing after passing and deposits.
2. the manufacture method of HTHP steel pipe as claimed in claim 1 is characterized in that, monofilament automatic submerged arc welding is adopted in described interior weldering.
3. the manufacture method of HTHP steel pipe as claimed in claim 1 is characterized in that, the automatic submerged arc welding of monofilament multilayer multiple tracks is adopted in described outside weld.
4. the manufacture method of HTHP steel pipe as claimed in claim 1 is characterized in that, described final detection comprises that ultrasound examination, X ray detection, magnetic detection, Non-Destructive Testing, hydraulic pressure detect and take advantage of the magnetic detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102129856A CN102294571A (en) | 2010-06-25 | 2010-06-25 | Method for manufacturing high-temperature and high-pressure steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102129856A CN102294571A (en) | 2010-06-25 | 2010-06-25 | Method for manufacturing high-temperature and high-pressure steel pipe |
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| CN102294571A true CN102294571A (en) | 2011-12-28 |
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| CN2010102129856A Pending CN102294571A (en) | 2010-06-25 | 2010-06-25 | Method for manufacturing high-temperature and high-pressure steel pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728744A (en) * | 2012-07-04 | 2012-10-17 | 上海依赛工业有限公司 | Forming method of car rear cover elbow and positioning fixture special for welding |
| CN103394546A (en) * | 2013-08-21 | 2013-11-20 | 武汉钢铁(集团)公司 | Production method for longitudinal welded pipe |
| CN103921075A (en) * | 2014-04-28 | 2014-07-16 | 武汉钢铁(集团)公司 | Method for manufacturing wear resistant slurry conveying longitudinal welded pipe |
| CN106112389A (en) * | 2016-06-24 | 2016-11-16 | 河北宇鹏重工管道装备制造有限公司 | A kind of bimetallic clad steel plate elbow method of manufacturing technology |
| CN107891249A (en) * | 2017-10-16 | 2018-04-10 | 中船重工鹏力（南京）智能装备系统有限公司 | A kind of metallic cylinder shaping and the automatic production method and production line that are successively set with |
| CN108311858A (en) * | 2017-01-14 | 2018-07-24 | 天津鸿翔工程机械有限公司 | A kind of drilling rod processing technology |
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| CN101204720A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube |
| CN101205597A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Method for manufacturing X100 pipeline steel submerged arc straight weld pipe |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101204720A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube |
| CN101205597A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Method for manufacturing X100 pipeline steel submerged arc straight weld pipe |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728744A (en) * | 2012-07-04 | 2012-10-17 | 上海依赛工业有限公司 | Forming method of car rear cover elbow and positioning fixture special for welding |
| CN103394546A (en) * | 2013-08-21 | 2013-11-20 | 武汉钢铁(集团)公司 | Production method for longitudinal welded pipe |
| CN103394546B (en) * | 2013-08-21 | 2015-06-03 | 武汉钢铁(集团)公司 | Production method for longitudinal welded pipe |
| CN103921075A (en) * | 2014-04-28 | 2014-07-16 | 武汉钢铁(集团)公司 | Method for manufacturing wear resistant slurry conveying longitudinal welded pipe |
| CN103921075B (en) * | 2014-04-28 | 2016-01-20 | 武汉钢铁(集团)公司 | A kind of preparation method of wear-resistant slurry pipeline steel ERW |
| CN106112389A (en) * | 2016-06-24 | 2016-11-16 | 河北宇鹏重工管道装备制造有限公司 | A kind of bimetallic clad steel plate elbow method of manufacturing technology |
| CN106112389B (en) * | 2016-06-24 | 2018-04-20 | 河北宇鹏重工管道装备制造有限公司 | A kind of bimetallic clad steel plate elbow method of manufacturing technology |
| CN108311858A (en) * | 2017-01-14 | 2018-07-24 | 天津鸿翔工程机械有限公司 | A kind of drilling rod processing technology |
| CN108311858B (en) * | 2017-01-14 | 2020-09-01 | 天津鸿翔工程机械有限公司 | Drill rod machining process |
| CN107891249A (en) * | 2017-10-16 | 2018-04-10 | 中船重工鹏力（南京）智能装备系统有限公司 | A kind of metallic cylinder shaping and the automatic production method and production line that are successively set with |
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Application publication date: 20111228 |