CN102189377A - Manufacture process of X100 steel-grade steel plate hot-press bend - Google Patents
Manufacture process of X100 steel-grade steel plate hot-press bend Download PDFInfo
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- CN102189377A CN102189377A CN2011100695914A CN201110069591A CN102189377A CN 102189377 A CN102189377 A CN 102189377A CN 2011100695914 A CN2011100695914 A CN 2011100695914A CN 201110069591 A CN201110069591 A CN 201110069591A CN 102189377 A CN102189377 A CN 102189377A
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Abstract
The invention discloses a manufacture process of an X100 steel-grade steel plate hot-press bend, which comprises the following steps of: 1, selecting a proper X100-grade steel plate; 2, preparing raw materials: cutting the raw materials into fan-shaped blanks according to a design size; 3, hot-forming, wherein the heating temperature is not more than 920 DEG C, the heating temperature raising speed of the blanks is controlled to be about 300 DEG C/h; 4, flatting; 5, welding, wherein a welding material matched with base metal is adopted for welding internal and external arc longitudinal joints of the blanks; 6, shaping, opening-flatting and size-detecting; 7, thermally treating; 8, carrying out performance detecting, surface cleaning, nondestructive testing and end part machining; and 9, detecting a finished product. In the invention, chemical ingredients of the raw materials are optimized so that the raw materials have smaller grain size, higher strength and lower welding crack sensitivity coefficient. The proper welding material is selected, and heat input during welding is controlled, therefore, deposited metal with better flexibility is obtained. Proper hot-forming and thermal-treatment temperatures are selected, a very fine bainite structure is formed, and the high-quality bend finished product according with the standard and being suitable for being butted with a trunk line pipeline is obtained.
Description
Technical field
The invention belongs to a kind of processing method of elbow, a kind of specifically X100 grade steel plate heats the process of bending head.
Technical background
Current, the sustainable growth in the world of the demand of this clean energy resource of natural gas, it is interconnected that natural gas line has formed the whole world, and the gas transmission engineering construction has also entered the peak period.In order to improve the expense that transfer efficiency reduces pipeline installation, high grade of steel X series pipe line steel becomes the main steel of using, and progressively improves the steel rank and becomes to take as the leading factor thinking.The rank of pipe line steel series steel pipe and pipe fitting is progressively brought up to the X80 grade of steel and is widely used over past ten years.According to successful application example and making experiential basis, both at home and abroad X100 grade of steel line pipe is tentatively trial-produceed successfully, but, matching with it and use requisite main pipe fitting X100 elbow that a successfully example is not arranged as yet, is the historic mission of pipe-line construction to the development of X100 grade of steel elbow.But directly cross the X100 grade of steel by X80 and also have very big technical difficulty.At first,, expect 790Mpa grade high-strength and higher low-temperature impact resistance toughness, still need walk low-carbon microalloy and change into branch design thinking guaranteeing that product has under the prerequisite of good on-the-spot welding performance.Can only realize by the content of each alloying element of raising and the controlled rolling process of science, and it will certainly influence the difficulty of processing of product in each operations such as moulding, welding, can't realize every performance indications of product with the manufacturing process of hanging down grade of steel in the past.
Summary of the invention
The present invention's purpose is to overcome the above-mentioned deficiency of prior art, provides a kind of X100 grade steel plate to heat the process of bending head, and it can reach the requirement of standard code.
In order to achieve the above object, the present invention takes following process:
1. in conjunction with the chemical composition of the female pipe of main line and according to pipe fitting production technology characteristic, the raw material chemical composition is designed, select suitable X100 grade steel plate, its CEpcm≤0.25%, C content is controlled at 0.07-0.10%, and Mn content is 0.8-2.0%, Si content is≤0.35%, Cr content is≤0.04%, and Mo content is≤0.35%, and V content is≤0.08%, Ni content is≤0.5%, Nb content is≤0.05%, and Cu content is≤0.50%, and its grain size control is more than 11 grades;
2. blanking: raw material are slit into fan-shaped blank by design size;
3. hot-forming: heating-up temperature≤920 ℃, the heating of pipe blank programming rate is controlled at about 300 ℃/h;
4. plain film;
5. welding: adopt welding material with the mother metal coupling, interior outer arc longitudinal joint to the base pipe welds, the control welding pre-heating temperature is 200 ℃ ± 10 ℃, interlayer temperature≤200 ℃, and control welding current≤180A, adopt arrow path welding control speed of welding 〉=18cm/min, guarantee hot input quantity≤20KJ/cm;
6. shaping, Ping Kou, size detection;
7. heat treatment: by the even shove charge of standard, weld seam is horizontal, strict control Technology for Heating Processing improves the cooling velocity when quenching, to obtain the higher grain size of rank as far as possible;
8. Performance Detection, removing surface, Non-Destructive Testing, end machined;
9. finished product detection.
The present invention adopts above-mentioned process to have following effect: the one, the raw material chemical composition is optimized design, by selecting diversification low-carbon microalloy composition, material is had than the fineness of grain, higher-strength, lower weld crack sensitivity coefficient, strengthen the loss surplus that in hot procedure, causes grain size and intensity, guaranteed the feasibility of welding material and welding procedure.The 2nd, by the optimization of welding material being chosen the welding material that has obtained with mother metal coupling, and the hot input quantity during strict control welding, obtained having the deposited metal of good obdurability, solved the difficult problem of the softening and embrittlement tissue formation in weld seam and heat affected area.The 3rd, the strictness control by to hot briquetting and heat treatment step is in the suitable temperature range material in all are heated operation.Reasonably heating process has limited material crystals disorganization and thick, the complete solid solution of all trace elements is in crystal after the final heat treatment, formed superfine bainite structure, make the surface and the heart portion performance uniformity of finished product mother metal and weld seam, thereby obtain meeting standard and the suitable high-quality elbow finished product that docks with main pipeline.
The specific embodiment
Introduce the present invention in detail below in conjunction with embodiment.
Embodiment: the present invention takes following technology:
1. the raw material chemical composition is designed, select suitable X100 grade steel plate, its carbon equivalent Pcm0.23%, C content 0.083%, Mn content are 1.86%, and Si content is 0.254%, Cr content is 0.032%, Mo content is 0.232%, and V content is 0.01%, and Ni content is 0.395%, Nb content is 0.054%, Cu content is 0.358%, and P content is 0.007%, and S content is 0.001%; Its grain size is 11.5 grades;
2. blanking: raw material are slit into fan-shaped blank by design size;
3. hot-forming: heating-up temperature≤920 ℃, the heating of pipe blank programming rate is controlled at about 300 ℃/h;
4. plain film;
5. welding: adopt welding material (grade of steel is the 760Mpa level) with the mother metal coupling, interior outer arc longitudinal joint to the base pipe welds, the control welding pre-heating temperature is 200 ℃ ± 10 ℃, interlayer temperature≤200 ℃, and control welding current≤180A adopts arrow path welding control speed of welding 〉=18cm/min to guarantee hot input quantity≤20KJ/cm;
6. shaping, Ping Kou, size detection;
7. heat treatment: by the even shove charge of standard, weld seam is horizontal, strict control Technology for Heating Processing, the cooling velocity that improves when quenching reaches 500 ℃/min as far as possible, to obtain the grain size of rank 〉=11 grade;
8. Performance Detection, removing surface, Non-Destructive Testing, end machined;
9. finished product detection.
In the technology of the present invention,, improve speed of welding, limit hot input quantity, the base pipe of performance unanimity is provided for finished product guaranteeing to reduce welding current under the prerequisite that weld metal fully merges; Strictness has been controlled all the manufacturing procedure of heat input to product, in processing range, select for use lower limit temperature to carry out to improve firing rate as far as possible and improve cooling rate when quenching as far as possible, effectively control the leading indicator of this embodiment steel performance of metallic crystalline structure, finally obtained to meet the product that the pipe-line engineering requires with the pipe fitting technical conditions.
Claims (1)
1. X100 steel grade steel plate hot-pressed elbow manufacturing process is characterized in that it takes following steps:
(1) the raw material chemical composition is designed, select suitable X100 grade steel plate, its CEpcm≤0.25%, C content is controlled at 0.07-0.10%, Mn content is 0.8-2.0%, and Si content is≤0.35%, and Cr content is≤0.04%, Mo content is≤0.35%, V content is≤0.08%, and Ni content is≤0.5%, and Nb content is≤0.05%, Cu content is≤0.50%, and its grain size control is more than 11 grades;
(2) blanking: raw material are slit into fan-shaped blank by design size;
(3) hot-forming: heating-up temperature≤920 ℃, the heating of pipe blank programming rate is controlled at about 300 ℃/h;
(4) plain film;
(5) welding: adopt welding material with the mother metal coupling, interior outer arc longitudinal joint to the base pipe welds, the control welding pre-heating temperature is 200 ℃ ± 10 ℃, interlayer temperature≤200 ℃, and control welding current≤180A, adopt arrow path welding control speed of welding 〉=18cm/min, guarantee hot input quantity≤20KJ/cm;
(6) shaping, Ping Kou, size detection;
(7) heat treatment: by the even shove charge of standard, weld seam is horizontal, the cooling velocity during quenching reaches 500 ℃/min;
(8) Performance Detection, removing surface, Non-Destructive Testing, end machined;
(9) finished product detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110069591 CN102189377B (en) | 2011-03-23 | 2011-03-23 | Manufacture process of X100 steel-grade steel plate hot-press bend |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110069591 CN102189377B (en) | 2011-03-23 | 2011-03-23 | Manufacture process of X100 steel-grade steel plate hot-press bend |
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| CN102189377A true CN102189377A (en) | 2011-09-21 |
| CN102189377B CN102189377B (en) | 2013-01-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501028A (en) * | 2011-11-22 | 2012-06-20 | 西安优耐特容器制造有限公司 | Method for manufacturing zirconium elbow |
| CN107309610A (en) * | 2017-06-28 | 2017-11-03 | 四川石油天然气建设工程有限责任公司 | A kind of radius of curvature R 1.5D corrosion resistant alloys composite elbow tube manufacture method |
| CN107891216A (en) * | 2017-11-14 | 2018-04-10 | 宝鸡中铁宝桥天元实业发展有限公司 | High-strength steel thick plates stress concentration prevention method |
| CN109161808A (en) * | 2018-10-30 | 2019-01-08 | 江苏亿超工程塑料有限公司 | A kind of Direct-Buried Heating Pipeline elbow and preparation method thereof |
| CN109465610A (en) * | 2019-01-10 | 2019-03-15 | 河北宇鹏重工科技有限公司 | A kind of technique using the manufacture low temperature molding threeway of X80 steel plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6532995B1 (en) * | 1999-01-07 | 2003-03-18 | Nippon Steel Corporation | Super-high-strength line pipe excellent in low temperature toughness and production method thereof |
| CN101474646A (en) * | 2009-01-15 | 2009-07-08 | 河北省沧州恒通管件制造有限公司 | Hot extrusion technological process for elbow from X80 grade steel plate |
| CN101619416A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | High-strength X100 pipe line steel hot rolling flat plate and method for manufacturing same |
-
2011
- 2011-03-23 CN CN 201110069591 patent/CN102189377B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6532995B1 (en) * | 1999-01-07 | 2003-03-18 | Nippon Steel Corporation | Super-high-strength line pipe excellent in low temperature toughness and production method thereof |
| CN101619416A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | High-strength X100 pipe line steel hot rolling flat plate and method for manufacturing same |
| CN101474646A (en) * | 2009-01-15 | 2009-07-08 | 河北省沧州恒通管件制造有限公司 | Hot extrusion technological process for elbow from X80 grade steel plate |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501028A (en) * | 2011-11-22 | 2012-06-20 | 西安优耐特容器制造有限公司 | Method for manufacturing zirconium elbow |
| CN107309610A (en) * | 2017-06-28 | 2017-11-03 | 四川石油天然气建设工程有限责任公司 | A kind of radius of curvature R 1.5D corrosion resistant alloys composite elbow tube manufacture method |
| CN107891216A (en) * | 2017-11-14 | 2018-04-10 | 宝鸡中铁宝桥天元实业发展有限公司 | High-strength steel thick plates stress concentration prevention method |
| CN109161808A (en) * | 2018-10-30 | 2019-01-08 | 江苏亿超工程塑料有限公司 | A kind of Direct-Buried Heating Pipeline elbow and preparation method thereof |
| CN109465610A (en) * | 2019-01-10 | 2019-03-15 | 河北宇鹏重工科技有限公司 | A kind of technique using the manufacture low temperature molding threeway of X80 steel plate |
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| CN102189377B (en) | 2013-01-30 |
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Address after: 061300 Zhenggang Industrial Park, Yanshan County, Cangzhou City, Hebei Province Patentee after: Hebei Hengtong Group Yupeng Heavy Engineering Technology Co.,Ltd. Address before: 061300 Zhenggang Industrial Park, Yanshan County, Cangzhou City, Hebei Province Patentee before: HEBEI YUPENG HEAVY INDUSTRY TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20210611 Address after: 061000 houhan village, Hanji Town, Yanshan County, Cangzhou City, Hebei Province Patentee after: Hebei Hengtong Pipe Fittings Group Co.,Ltd. Address before: 061300 Zhenggang Industrial Park, Yanshan County, Cangzhou City, Hebei Province Patentee before: Hebei Hengtong Group Yupeng Heavy Engineering Technology Co.,Ltd. |
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