CN1824431A - Smelting technology of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe - Google Patents
Smelting technology of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe Download PDFInfo
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- CN1824431A CN1824431A CN 200610039113 CN200610039113A CN1824431A CN 1824431 A CN1824431 A CN 1824431A CN 200610039113 CN200610039113 CN 200610039113 CN 200610039113 A CN200610039113 A CN 200610039113A CN 1824431 A CN1824431 A CN 1824431A
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Abstract
The present invention discloses a smelting process for producing centrifugal casting austenitic stainless steel large-bore thick-wall nuclear main-pipeline straight pipe. Said invention adopts double smelting process of medium-frequency furnace + AOD furnace refining process. It is characterized by smelting CF8M Modify ultra-low carbon nitrogen-controlled austenitic stainless steel, its tapping temperature is 1600deg.C-1630deg.C, and adopting staged pouring process and inner wall heat-producing heat-insulating agent, so that it can ensure the compactness of centrifugal cast pipe and can improve surface roughness of inner wall of main pipe simultaneously.
Description
Technical field: the present invention relates to a kind of smelting process of centrifugal casting furnace tube, particularly relate to the manufacture craft of a kind of nuclear power plant with large culiber thick wall nulear main pipeline.
Technical background: along with rapid economic development, living standards of the people improve constantly.Need for electricity is increasing, but domestic coal storage capacity is fewer and feweri.And the thermal power generation environmental pollution is also very big, and this just must have a kind of new forms of energy to replace---nuclear power development.Nuclear energy power generation country formulates long term growth planning (2005～the year two thousand twenty).At present, pressurized-water reactor nuclear power plant is at present domestic built or in one of main nuclear power plant that builds, pressurized-water reactor nuclear power plant trunk line coupled reaction core pressure vessel wherein, main evaporator and main pump, form a loop, under the driving of main pump, cooling agent circulates in loop, takes and pass to the heat that nuclear fission produces out of main evaporator.Trunk line is the important component part that keeps coolant pressure border integrality, and its safe class is the nuclear safety one-level, and the centrifugally cast pipe straight tube is the important component part of trunk line.In recent years, the hot rolling technology has been made significant headway, domesticly develop high performance alloy furnace tubes by adopting with the production method of centrifugal casting roll, to satisfy the needs of nuclear power, the centrifugal casting roll production method is compared with continuous casting composite algorithm (Chinese patent CN1280042), electroslag remelting process (Chinese patent CN1157192) etc., and it is few to have an equipment investment, and production cost is low, method of operating is easy, advantages such as constant product quality.But, nuclear power is with containing alloying elements such as more W, Cr, Mo, V in the alloy furnace tubes by adopting, and the carbide density difference of these elements and formation thereof is very big, under common centrifugal casting condition, the alloying element segregation is serious in the alloy furnace tubes by adopting, and outer V content is low, and W, Mo content height, internal layer is just in time opposite, has had a strong impact on the wearability of boiler tube like this; The cost of material height; The clarity of product is lower; Oxygen in the product, sulphide inculsion are more.
Summary of the invention: the object of the present invention is to provide a kind of segregation-free, wearability good, reduce cost of material simultaneously, make the manufacture method of the centrifugal casting alloy furnace tubes by adopting that the clarity of product is improved.
The present invention is achieved in that the smelting process of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe, it is characterized in that: comprise the following steps:
1. adopt the two-link smelting process of intermediate frequency furnace+AOD stove refining, smelt CF8MModify Ultra-low carbon, control nitrogen austenitic stainless steel, provide half steel water, transport half steel water with casting ladle and give the AOD stove, carry out refining with three-step approach then: the one step decarburization of AOD stove by intermediate frequency furnace; The two steps reduction of AOD stove; AOD stove three steps are made into branch, AOD stove tapping temperature: 1600-1630 ℃.Provide pure molten steel to spun cast pipe and sand casting, thereby guarantee that properties of product reach the requirement of trunk line product technology condition defined, 1600 ℃～1630 ℃ of tapping temperatures;
2. type tube is preheating to 200-250 ℃, wall sprays the high-temperature coatings of anti-one deck within it, paint thickness 2-3mm.Adopt high-temperature coatings, this coating satisfies suitable acid-base value coupling, produces defectives such as dipped type pore thereby stop product surface.Have sufficiently high refractoriness, elevated temperature strength, suspension, gas-forming property and coating are guaranteed the uniformity of coating.
3. adopt the segmented pouring procedure to guarantee that molten steel steadily fills type in type tube, avoid the radially disturbance of molten steel in type tube, molten steel is guaranteed: the come-up in the molten steel (gas, assorted come-up) under relative static conditions, sinking (molten steel sinking) is fully carried out, and improves the clarity of molten steel and reduces segregation to greatest extent and the compactness of assurance goods.1500 ℃-1570 ℃ of pouring temperatures, a ladder type is provided with the type tube rotating speed at 400-500r/min;
Inner-wall spraying one deck heat preservation agent at the cast product, with control axial heat conduction, guarantee that molten steel is in crystallizer, pile the consecutive solidification of mode from the type wall to the center of crystallization into the concentric plan type, to guarantee from beginning to crystallize near solidifying the enough feeding molten steel of Shi Junyou fully, thereby guarantee the compactness of spun cast pipe, improve the surface roughness of being responsible for inwall simultaneously.
4. 300-400 ℃ of bottom knockout;
5. product is through 1050-1150 ℃ of temperature solution heat treatment.Solution treatment is one of important procedure in the heavy caliber thick wall austenitic stainless steel spun cast pipe manufacture process.Experimental study shows that in the time of 1200 ℃, the solubility of carbon in austenite is 0.14%, only is 0.08% in the time of 600 ℃.The purpose of solution heat treatment is that goods are heated to 1050 ℃～1150 ℃ temperature and constant temperature, allows carbon fully be dissolved in the austenite, and cooling is rapidly separated out to avoid carbide then, prevents the selective corrosion that similar intercrystalline corrosion is such.Solid solution temperature is to be undertaken by the regulation of charter, and four thermocouples are uniform in burner hearth, its temperature deviation＜± 10 ℃, and the quenching bath water temperature is lower than 34 ℃.
In addition, in process, adopt the computer simulation emulation technology, guarantee that crystallizer controls axial heat conduction, directed cooling fast radially in the solidification of molten steel process.
Adopt the main straight pipeline product performance index of cast of the present invention:
1. safe class: nuclear safety one-level;
2. credit rating: QA1 level;
3. antidetonation classification: I class;
4. operating pressure: P=15.2Mpa;
5. running temperature: T=315 ℃;
6. design temperature: T=350 ℃;
7. design pressure: P=17.15Mpa;
8. hydraulic test pressure: P=21.5Mpa;
9. projected life: Y=40
10. the selection of material: ASME SA-451 CPF8M Modf
The performance test result of main straight pipeline product:
1. the chemical composition analysis of main straight pipeline trial production part specification Φ 840 * 72.5 * 2000 (mm):
Regulation by technical conditions, the chemical composition analysis of pipeline section, comprise that the chemical composition analysis of taking a sample from casting ladle reaches the chemical analysis that will ask for 0 °, 90 °, 180 °, 270 ° orientation 1/4 a thickness finished product sample of finished product by charter, analysis result meets technical conditions (seeing Table 1).
Table 1 casting ladle and finished product chemical composition analysis result
| Project | Chemical element Wt% | |||||||||
| C | Si | Mn | S | P | Cr | Ni | Mo | Cu | Co | |
| Requirement | ≤ 0.04 | ≤ 1.00 | ≤ 1.50 | ≤ 0.020 | ≤ 0.030 | 18.00～ 21.00 | 9.00～ 12.00 | 2.00～ 3.00 | ≤ 0.10 | ≤ 0.08 |
| Casting ladle | 0.03 | 0.84 | 0.82 | 0.013 | 0.026 | 20.18 | 10.41 | 2.12 | 0.02 | 0.01 |
| Finished product 1 | 0.03 | 0.84 | 0.82 | 0.011 | 0.026 | 20.04 | 10.52 | 2.10 | 0.02 | 0.01 |
| Finished product 2 | 0.03 | 0.84 | 0.82 | 0.013 | 0.026 | 20.18 | 10.41 | 2.12 | 0.02 | 0.01 |
| Finished product 3 | 0.02 | 0.82 | 0.80 | 0.010 | 0.024 | 19.96 | 10.40 | 2.05 | 0.02 | 0.01 |
| Finished product 4 | 0.03 | 0.84 | 0.83 | 0.014 | 0.026 | 20.02 | 10.55 | 2.09 | 0.02 | 0.01 |
2. the mensuration of the delta ferrite of main straight pipeline product
By the technical conditions regulation, with casting ladle chemical composition and finished product chemical composition analysis result, calculate chromium equivalent Creq and nickel equivalent Nieq respectively, try to achieve the delta ferrite level value, the gained result meets and requires ferrite content to should be 15～20% in the technical conditions all in 16～18% scopes.
Nickel and chromium equivalent formula are respectively:
Nieq＝％Ni+30×％C+0.5×％Mn；
Creq＝％Cr+％Mo+1.5×％Si+0.5×％Nb。
The sample analysis result all contains 0.02% Nb
1. casting ladle is analyzed Nieq=10.41+30 * 0.03+0.5 * 0.82=11.7
Creq＝20.18+2.12+1.5×0.84+0.5×0.02＝23.6
Getting ferrite content is: 17%
2. from the 1# finished product sample analysis result of 0 ° of position of goods, 1/4 thickness sampling
Nieq＝10.52+30×0.03+0.5×0.82＝11.8
Creq＝20.04+2.10+1.5×0.84+0.5×0.02＝23.4
Getting ferrite content is: 17%
3. the 2# finished product sample analysis result from the sampling of 90 ° of positions of goods, 1/4 thickness gets
Nieq＝10.41+30×0.03+0.5×0.80＝11.7
Creq＝20.18+2.12+1.5×0.84+0.5×0.02＝23.6
Getting ferrite content is: 17%
4. the 3# finished product sample analysis result from the sampling of 180 ° of positions of goods, 1/4 thickness gets
Nieq＝10.40+30×0.03+0.5×0.80＝11.7
Creq＝19.96+2.05+1.5×0.82+0.5×0.02＝23.3
Getting ferrite content is: 16%
5. the 4# finished product sample analysis result from the sampling of 270 ° of positions of goods, 1/4 thickness gets
Nieq＝10.55+30×0.03+0.5×0.83＝11.9
Creq＝20.02+2.09+1.5×0.84+0.5×0.02＝23.4
Getting ferrite content is: 16%
By analysis, The above results all meets the regulation of technical conditions
3. the mechanical property of main straight pipeline product intercepting sample
The mechanical property sample presses the master drawing intercepting by the technical conditions requirement on the goods of solution heat treatment, press ASTM E8 and ASTM E21 standard, adopts the sample in Φ 10mm cross section to test, and its result of the test meets the setting (seeing Table 2) of technical conditions.
Table 2 normal temperature and high temperature (350 ℃) stretch test result
| Sample | Test temperature | σ bMPa | σ 0.2MPa | δ％ | φ％ |
| Setting | Normal temperature | ≥210 | ≥485 | ≥35 | ≥45 |
| HA-TS-1 | Normal temperature | 270 | 530 | 45.3 | 65.8 |
| HA-TS-2 | Normal temperature | 265 | 538 | 56.0 | 73.7 |
| HC-TS-1 | Normal temperature | 260 | 524 | 54.6 | 62.1 |
| HC-TS-2 | Normal temperature | 269 | 542 | 48.0 | 58.4 |
| CB-TS-1 | Normal temperature | 261 | 523 | 52.2 | 71.1 |
| CB-TS-2 | Normal temperature | 259 | 535 | 52.4 | 65.1 |
| CD-TS-1 | Normal temperature | 271 | 531 | 47.6 | 65.1 |
| CD-TS-2 | Normal temperature | 277 | 559 | 45.7 | 56.7 |
| Setting | 350℃ | ≥125 | ≥355 | ≥25 | ≥40 |
| HA-ETS-1 | 350℃ | 152 | 392 | 44 | 72 |
| HA-ETS-2 | 350℃ | 147 | 385 | 36 | 54 |
| HC-ETS-1 | 350℃ | 148 | 393 | 40 | 60 |
| HC-ETS-2 | 350℃ | 154 | 396 | 40 | 62 |
| HB-ETS-1 | 350℃ | 149 | 382 | 38 | 55 |
| HB-ETS-2 | 350℃ | 147 | 379 | 38 | 58 |
| HD-ETS-1 | 350℃ | 150 | 387 | 42 | 62 |
| HD-ETS-2 | 350℃ | 151 | 380 | 44 | 67 |
4. the summer of main straight pipeline product intercepting sample is than impacting toughness
Summer tests by ASTM A370 than impacting the used sample of toughness test by the straight length intercepting of technical conditions after the solution heat treatment, and result of the test meets the mean value AK of three tests of regulation of technical conditions
VThe single minimum AK of 〉=80J
V〉=60J (seeing Table 3)
Table 3 Charpy-type test result
| Sample | C1-1 | C1-2 | C1-3 | C3-1 | C3-2 | C3-3 | H2-1 | H2-2 | H2-3 | H4-1 | H4-2 | H4-3 |
| AK(J) | 204 | 198 | 224 | 218 | 220 | 190 | 188 | 210 | 241 | 226 | 226 | 190 |
| Mean value (J) | 208 | 209 | 213 | 219 | ||||||||
| Single minimum of a value (J) | 198 | 190 | 188 | 190 | ||||||||
5. the intercrystalline corrosion sensitivity tests of main straight pipeline product sample
Sample slowly cooling in luxuriant good fortune stove behind 30 minutes constant temperature of 725 ℃ of insulations by the technical conditions intercepting, through milled processed, purified rinse water is arranged after acetone deoils, dry up, boiled 24 hours in the triangle of taking back flow condenser burns by ASTMA262 E method, sample through Huey test, clod wash is 180 ° on testing machine, does not find cracking phenomena.
6. the macroetch test of main straight pipeline product section cross section ring-shaped sample
Get the ring-shaped sample of a cross section from straight length one end of process solution treatment by the technical conditions requirement, carried out macroetch by ASTM E340, cross section tissue is even, defectives such as any shrinkage cavity, bubble and even crackle are not found in densification, meets the requirement of technical conditions.
Claims (5)
1. the smelting process of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe is characterized in that:
1. adopt the two-link smelting process of intermediate frequency furnace+AOD stove refining, smelt CF8MModify Ultra-low carbon, control nitrogen austenitic stainless steel, 1600 ℃～1630 ℃ of tapping temperatures;
2. type tube is preheating to 200-250 ℃;
3. adopt the segmented pouring procedure to guarantee that molten steel steadily fills type in type tube, avoid the radially disturbance of molten steel in type tube, 1500 ℃-1570 ℃ of pouring temperatures, the type tube rotating speed is at 400-500r/min;
4. 300-400 ℃ of bottom knockout;
5. product is through molten admittedly heat treatment.
2. the smelting process of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe according to claim 1, it is characterized in that: wall sprays the high-temperature coatings of anti-one deck within it when type tube is preheating to 200-250 ℃, paint thickness 2-3mm.
3. the smelting process of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe according to claim 1 is characterized in that: be coated with one deck heat preservation agent, heat preserving agent molding thickness 1.5-2mm at the inwall of pouring into a mould product.
4. the smelting process of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe according to claim 1, it is characterized in that: a ladder type is provided with the type tube rotating speed.
5. the smelting process of centrifugal casting austenic stainless steel large culiber thick wall nulear main pipeline straight pipe according to claim 1, it is characterized in that: adopt the computer simulation emulation technology, guarantee that crystallizer controls axial heat conduction in the solidification of molten steel process, directed cooling fast radially.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817067A (en) * | 2010-05-06 | 2010-09-01 | 四川三洲川化机核能设备制造有限公司 | Method for producing seamless stainless steel tube by centrifugally pouring hollow billet |
| CN101708539B (en) * | 2009-11-03 | 2011-06-08 | 上海大学 | Manufacture method of multi-element chilled cast iron anti-wear roller ring |
| CN102233417A (en) * | 2011-07-07 | 2011-11-09 | 烟台台海玛努尔核电设备股份有限公司 | Centrifugal casting process for main pipeline of million kilowatt-grade nuclear power plant |
| CN102240789A (en) * | 2011-07-07 | 2011-11-16 | 烟台台海玛努尔核电设备股份有限公司 | Centrifugal casting method of main pipeline of million-kilowatt nuclear plant |
| CN105108098A (en) * | 2015-09-30 | 2015-12-02 | 吉林常春高氮合金研发中心有限公司 | Technology for centrifugal casting of high-nitrogen austenitic stainless steel pipe at normal pressure |
| CN111826583A (en) * | 2019-04-15 | 2020-10-27 | 沈阳铸造研究所有限公司 | High-corrosion-resistance boron stainless steel material and preparation method and application thereof |
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2006
- 2006-03-28 CN CN 200610039113 patent/CN1824431A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708539B (en) * | 2009-11-03 | 2011-06-08 | 上海大学 | Manufacture method of multi-element chilled cast iron anti-wear roller ring |
| CN101817067A (en) * | 2010-05-06 | 2010-09-01 | 四川三洲川化机核能设备制造有限公司 | Method for producing seamless stainless steel tube by centrifugally pouring hollow billet |
| CN102233417A (en) * | 2011-07-07 | 2011-11-09 | 烟台台海玛努尔核电设备股份有限公司 | Centrifugal casting process for main pipeline of million kilowatt-grade nuclear power plant |
| CN102240789A (en) * | 2011-07-07 | 2011-11-16 | 烟台台海玛努尔核电设备股份有限公司 | Centrifugal casting method of main pipeline of million-kilowatt nuclear plant |
| CN102233417B (en) * | 2011-07-07 | 2012-10-31 | 烟台台海玛努尔核电设备股份有限公司 | Centrifugal casting process for main pipeline of million kilowatt-grade nuclear power plant |
| CN102240789B (en) * | 2011-07-07 | 2013-01-23 | 烟台台海玛努尔核电设备股份有限公司 | Centrifugal casting method of main pipeline of million-kilowatt nuclear plant |
| CN105108098A (en) * | 2015-09-30 | 2015-12-02 | 吉林常春高氮合金研发中心有限公司 | Technology for centrifugal casting of high-nitrogen austenitic stainless steel pipe at normal pressure |
| CN111826583A (en) * | 2019-04-15 | 2020-10-27 | 沈阳铸造研究所有限公司 | High-corrosion-resistance boron stainless steel material and preparation method and application thereof |
| CN111826583B (en) * | 2019-04-15 | 2022-02-15 | 沈阳铸造研究所有限公司 | High-corrosion-resistance boron stainless steel material and preparation method and application thereof |
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