CN102407426A - Method for manufacturing low alloy steel tube of low-temperature pressure vessel - Google Patents
Method for manufacturing low alloy steel tube of low-temperature pressure vessel Download PDFInfo
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- CN102407426A CN102407426A CN2010102918541A CN201010291854A CN102407426A CN 102407426 A CN102407426 A CN 102407426A CN 2010102918541 A CN2010102918541 A CN 2010102918541A CN 201010291854 A CN201010291854 A CN 201010291854A CN 102407426 A CN102407426 A CN 102407426A
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Abstract
The invention discloses a method for manufacturing a low alloy steel tube of a low-temperature pressure vessel, which is realized by the following steps: cutting into strips, i.e. vertically cutting a steel plate; milling edges, i.e. milling the two side edges of the steel plate at a time; prebending, i.e. removing straight flanges of the end of the plate; bending, i.e. primarily bending the steel plate into a cylinder shape; molding, i.e. molding the cylinder-shaped steel plate into the steel tube; closing a joint and prewelding, i.e. carrying out joint close on the connecting end of the steel tube; internal welding, i.e. welding the inner part of the connecting end of the steel tube; external welding, i.e. welding the external part of the connecting end of the steel tube; machining a tube end, i.e. machining a flat end of the tube end of the steel tube; straightening, wherein straightness accuracy being up to standard can be reached only through straightening; finishing, i.e. forcibly finishing through an O-shaped mould; trimming an end, i.e. enabling the end of the steel tube to be smooth; final detecting, i.e. detecting the steel tube; and warehousing, i.e. warehousing after the steel tube is detected to be qualified. A measure for preventing unqualified lower temperature impact toughness is controlling welding parameters. Controlling voltage endurance of the steel tube refers to carrying out bulk heat treatment on the steel tube after welding.
Description
Technical field
The present invention relates to a kind of manufacturing approach of steel, particularly relate to a kind of low-temperature pressure container low-alloy steel manufacture of steel pipe
Background technology
Along with the development of low-temperature pressure container industry, during making, low-temperature pressure container low-alloy steel (especially 16MnDR type low-temperature pressure container low-alloy steel) bridge uses the not competent main position in engineering of traditional low-alloy steel on a large scale.The positive application 1 6MnDR of bridge manufacturing industry type low-temperature pressure container low-alloy steel, but, each big designing institute and production commercial city dare not be used easily because its steel pipe is made and the difficulty of welding.In addition, the yield strength >=315Mpa of 16MnDR type low-temperature pressure container low-alloy steel (its chemical composition is as shown in table 1), tensile strength is greater than 490-620Mpa.Intensity and hardness are higher, and very likely impact flexibility is not up to standard after difficult forming and the welding, 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 the steel heat affecting is easy to generate the inductile tissue, and the influence of impact toughness is big, and the invar pipe is that pressure vessel is withstand voltage with needing in addition, and the steel pipe postwelding is carried out bulk heat treatmet.
The chemical composition of table 1 16MnDR type low-temperature pressure container low-alloy steel
| Model | C | Si | Mn | P | S | Cu |
| 16MnDR | ≤0,20 | 0.15-0.5 | 1.2-1.6 | ≤0,025 | ≤0,015 | 0.2-0.5 |
Summary of the invention
For the intensity that solves low-temperature pressure container low-alloy steel in the prior art with hardness is higher, the technical problem that very likely cracks after difficult forming and the welding, the invention provides a kind of manufacturing approach of low-temperature pressure container low-alloy steel steel pipe.
The present invention realizes through following 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 through a Milling Process;
Step 3: pre-bending, pre-bending are to eliminate plate end straight flange, bend circular arc to the side of steel plate earlier, 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: repair end, make the termination of steel pipe level and smooth;
Step 13: the final detection, steel pipe is detected;
Step 14: warehouse-in, steel pipe detects warehousing after passing and deposits.
Preferably, monofilament automatic submerged arc welding is adopted in said interior weldering.
Preferably, the automatic submerged arc welding of monofilament multilayer multiple tracks is adopted in said outside weld.
Preferably, said 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 defective main technique measure of weld seam impact toughness from being to adopt the little heat input of welding, reduces high-temperature residence time, and strict control welding parameter, and it is defective to reduce and exempt impact flexibility greatly; The measure that the present invention prevents to produce the weld seam longitudinal crack is to carry out preparatory 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 specify technical scheme of the present invention.
Manufacturing approach of the present invention is used to make 16MnDR type low-temperature pressure container low-alloy steel steel pipe.As shown in Figure 1, the manufacturing approach of low-temperature pressure container low-alloy steel of the present invention may further comprise the steps:
Step 1: open bar, a low-temperature pressure container low-alloy steel steel plate is carried out perpendicular cuts;
Step 2: mill the limit, to the dual-side of steel plate through a Milling Process;
Step 3: pre-bending, pre-bending mainly are to eliminate plate end straight flange, bend circular arc to the side of steel plate earlier, repeatedly are bent to the circular arc requirement with the standard patrix again, have so not only satisfied the pre-bending requirement but also have practiced thrift steel plate materials; The high pre-bending of invar intensity does not reach eliminates the straight flange requirement, changes original pre-bending, a pre-bending several times.
Step 4: bending tentatively is converted into tubular with steel plate; Emphasis control bending circularity, circularity generally is controlled in 20 millimeters, avoids shaping to cross ambassador's weld seam because of roundness deviation and longitudinal crack occurs.
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;
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;
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;
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: repair end, make the termination of steel pipe bright and clean level and smooth;
Step 13: 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 14: warehouse-in, steel pipe detects warehousing after passing and deposits.
The present invention prevents that the defective main technique measure of weld seam impact toughness from being to adopt the little heat input of welding, reduces high-temperature residence time, and strict control welding parameter, and it is defective to reduce and exempt impact flexibility greatly; The measure that the present invention prevents to produce the weld seam longitudinal crack is to carry out preparatory finishing before control pre-bending bending circularity and the interior weldering prerequisite.
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 appended claims.
Claims (4)
1. the manufacturing approach of a low-temperature pressure container low-alloy steel steel pipe, realize through following 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 through a Milling Process;
Step 3: pre-bending, pre-bending are to eliminate plate end straight flange, bend circular arc to the side of steel plate earlier, 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: repair end, make the termination of steel pipe level and smooth;
Step 13: the final detection, steel pipe is detected;
Step 14: warehouse-in, steel pipe detects warehousing after passing and deposits.
2. the manufacturing approach of a kind of low-temperature pressure container low-alloy steel as claimed in claim 1 is characterized in that, monofilament automatic submerged arc welding is adopted in said interior weldering.
3. the manufacturing approach of low-temperature pressure container low-alloy steel steel pipe as claimed in claim 1 is characterized in that, the automatic submerged arc welding of monofilament multilayer multiple tracks is adopted in said outside weld.
4. the manufacturing approach of low-temperature pressure container low-alloy steel steel pipe as claimed in claim 1 is characterized in that, said 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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| CN2010102918541A CN102407426A (en) | 2010-09-26 | 2010-09-26 | Method for manufacturing low alloy steel tube of low-temperature pressure vessel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102918541A CN102407426A (en) | 2010-09-26 | 2010-09-26 | Method for manufacturing low alloy steel tube of low-temperature pressure vessel |
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| CN102407426A true CN102407426A (en) | 2012-04-11 |
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| CN2010102918541A Pending CN102407426A (en) | 2010-09-26 | 2010-09-26 | Method for manufacturing low alloy steel tube of low-temperature pressure vessel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974987A (en) * | 2012-12-03 | 2013-03-20 | 中国航天科工集团第六研究院二一〇所 | Large-diameter thin-wall T250 steel pressure vessel vacuum electronic beam welding manufacturing method |
| CN104786017A (en) * | 2015-01-30 | 2015-07-22 | 张家港市博天机械有限公司 | Manufacturing method of pressure vessel metal tube |
| CN105458633A (en) * | 2016-01-06 | 2016-04-06 | 河北华通线缆集团股份有限公司 | Manufacturing method of low-carbon steel coiled tubing |
| CN108994542A (en) * | 2018-08-21 | 2018-12-14 | 江西华特电子化学品有限公司 | A kind of manufacturing method of low-temperature (low temperature) vessel |
| CN113427217A (en) * | 2021-07-08 | 2021-09-24 | 绍兴大兴锅炉容器有限公司 | Manufacturing method of pressure container |
| CN115838897A (en) * | 2022-11-18 | 2023-03-24 | 莱芜钢铁集团银山型钢有限公司 | Martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment conveying pipeline and preparation method thereof |
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| CN1368612A (en) * | 2002-02-22 | 2002-09-11 | 武汉重工铸锻有限责任公司 | Technology for manufacturing large-diameter thick-wall seamless steel pipe |
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Patent Citations (4)
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| US4146950A (en) * | 1976-08-06 | 1979-04-03 | Texaco Inc. | Methods for forming bubble cap assemblies for a gas and liquid contact apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974987A (en) * | 2012-12-03 | 2013-03-20 | 中国航天科工集团第六研究院二一〇所 | Large-diameter thin-wall T250 steel pressure vessel vacuum electronic beam welding manufacturing method |
| CN104786017A (en) * | 2015-01-30 | 2015-07-22 | 张家港市博天机械有限公司 | Manufacturing method of pressure vessel metal tube |
| CN105458633A (en) * | 2016-01-06 | 2016-04-06 | 河北华通线缆集团股份有限公司 | Manufacturing method of low-carbon steel coiled tubing |
| CN108994542A (en) * | 2018-08-21 | 2018-12-14 | 江西华特电子化学品有限公司 | A kind of manufacturing method of low-temperature (low temperature) vessel |
| CN113427217A (en) * | 2021-07-08 | 2021-09-24 | 绍兴大兴锅炉容器有限公司 | Manufacturing method of pressure container |
| CN113427217B (en) * | 2021-07-08 | 2022-10-25 | 浙江三金机电科技有限公司 | Pressure container manufacturing method |
| CN115838897A (en) * | 2022-11-18 | 2023-03-24 | 莱芜钢铁集团银山型钢有限公司 | Martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment conveying pipeline and preparation method thereof |
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| C06 | Publication | ||
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| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 200949 Shanghai Road, Baoshan District Development Zone, Changhong Road, No. 288 Applicant after: Shanghai yueyuechao Pipeline Technology Co. Ltd. Address before: 200949 Shanghai Road, Baoshan District Development Zone, Changhong Road, No. 288 Applicant before: Shanghai Yueyuechao Steel Tube Co., Ltd. |
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| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: SHANGHAI YUEYUECHAO STEEL TUBE CO., LTD. TO: SHANGHAI YUEYUECHAO STEEL PIPE TECHNOLOGY CO., LTD. |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120411 |