CN101769403B - Seamless steel tube for nuclear power and production method thereof - Google Patents
Seamless steel tube for nuclear power and production method thereof Download PDFInfo
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- CN101769403B CN101769403B CN2009103120377A CN200910312037A CN101769403B CN 101769403 B CN101769403 B CN 101769403B CN 2009103120377 A CN2009103120377 A CN 2009103120377A CN 200910312037 A CN200910312037 A CN 200910312037A CN 101769403 B CN101769403 B CN 101769403B
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Abstract
The invention relates to a seamless steel tube for nuclear power and a production method thereof, belonging to the field of seamless steel tubes. The invention solves the technical problem of providing the seamless steel tube for nuclear power, and the seamless steel tube can reduce 'flow-accelerated corrosion (FAC)'. The seamless steel tube for the nuclear power comprises the following chemical compositions in percentage by weight: 0.17-0.24% of C, 0.17-0.37% of Si, 0.35-0.65% of Mn, 0.18-0.35% of Cr and the balance of Fe and unavoidable impurities. The mechanical property and impact property (20 DEG C, 0 DEG C) and high-temperature instaneous tension of the seamless steel tube for nuclear power can fully satisfy the technical requirements of the seamless steel tube for a conventional island of a nuclear power plant, and the function of 'FAC (flow-accelerated corrosion)' resistance is achieved. The invention provides a novel choice for the seamless steel tube for the conventional island of the nuclear power plant, and has wide application prospect.
Description
Technical field
The present invention relates to seamless steel tube for nuclear power and production method thereof, belong to the seamless steel pipe field.
Background technique
At present, China's power industry is in the high-speed developing period, and according to the requirement of national energy sustainable development, nuclear power generation will be one of emphasis direction of energy development from now on because of its advantage efficient, economic, cleaning, and the construction of nuclear power station shows a rising trend.
Nuclear power station conventional island is similar to thermal power station, comprises the secondary coolant circuit system and the nuclear steam turbine (adopting saturated vapour red switch steam turbine) that are made of main steam line, feedwater piping.Compare with thermal power station, the steam running parameter of nuclear power station conventional island design is not high, be under the creep temperature, conveyance conduit does not in use produce creep, oxidation is also very little, does not need to use the heat-resisting alloy steel of high creep strength and high antioxidant, and conventional island carbonated drink conveyance conduit is selected the pipeline of C-Mn steel matter in a large number for use, but with respect to fired power generating unit with power, the flow velocity height of medium in its body, flow big (be about thermoelectricity 1.3～1.6 times).Exactly because carry flow velocity height, middle temperature, middle pressure that flow is big and have the saturated vapour of certain humidity, can produce " FAC (accelerated corrosion of flowing) " that causes because of the flowing velocity of steam and water is higher, according to the operating experience of international nuclear power station, the pipeline of bleeding of a plurality of systems of conventional island, water-supply line are to the FAC sensitivity.
FAC is that protective film dissolves in the mobile water or steam water interface in the carbon steel, and patina attenuation and protectiveness reduce, and rate of corrosion increases simultaneously, and the final etching rate equals dissolution rate and keeps a constant process, belongs to whole homogeneous corrosion.This " FAC " phenomenon can make the corrosion resistance variation of steel pipe internal-surface, therefore requires chemical composition to carry out particular design, improves the anti-carbonated drink erosion property of carbon steel delivery pipe.
Summary of the invention
Technical problem to be solved by this invention provides a kind of seamless steel tube for nuclear power, and this seamless steel pipe can reduce " accelerated corrosion (FAC) of flowing ".
Seamless steel tube for nuclear power of the present invention, its chemical composition is by weight percentage: C0.17～0.24%, Si0.17～0.37%, Mn0.35～0.65%, Cr0.18～0.35%, surplus is Fe and unavoidable impurities.
Wherein, above-mentioned unavoidable impurities comprises P and S, wherein, by weight percentage, P≤0.025%, S≤0.025%.
Further, in order to make pipe corrosion speed littler, seamless steel pipe of the present invention, its chemical composition is preferably by weight percentage: C0.19%, Si0.26%, Mn0.50%, Cr0.32%, P0.010%, S0.006%, surplus is Fe and unavoidable impurities.
The present invention also provides the method for producing above-mentioned seamless steel tube for nuclear power, and this method comprises the steps:
A, smelting pipe: smelt pipe, the chemical composition of pipe is by weight percentage: C0.17～0.24%, and Si0.17～0.37%, Mn0.35～0.65%, Cr0.18～0.35%, surplus is Fe and unavoidable impurities;
B, steel pipe rolling: pipe is rolled into seamless steel pipe, and wherein, the tapping temperature when pipe is rolling is 1260 ℃ ± 10 ℃, and finishing temperature is 890 ℃ ± 20 ℃;
C, steel pipe heat treatment: the steel pipe after rolling is heat-treated, and heat treatment temperature is 900 ± 10 ℃.
All the other steps of producing above-mentioned seamless steel pipe are identical with the production method of conventional seamless steel pipe.
The mechanical property of seamless steel tube for nuclear power of the present invention and impact property (20 ℃, 0 ℃), high temperature instantaneous stretching satisfy the technical requirements of nuclear power station conventional island with seamless steel pipe fully, have reached the effect of anti-" FAC (accelerated corrosion of flowing) ".The present invention has broad application prospects for nuclear power station conventional island provides a kind of new selection with seamless steel pipe.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is further described, does not therefore limit the present invention among the described scope of embodiments.
The production of embodiment's seamless steel tube for nuclear power of the present invention
1, smelts pipe
The chemical composition of smelting pipe sees Table 1 by weight percentage.
Table 1 pipe chemical composition (%)
| Heat (batch) number | C | Si | Mn | Cr | P | S |
| 0983761 | 0.19 | 0.26 | 0.50 | 0.32 | 0.010 | 0.006 |
| 0983842 | 0.20 | 0.24 | 0.48 | 0.20 | 0.012 | 0.008 |
| 0983957 | 0.22 | 0.27 | 0.52 | 0.26 | 0.013 | 0.007 |
In smelting, external refining, casting cycle, operate in strict accordance with standard, make the chemical composition of steel even, to guarantee the performance of steel pipe.
The T[O of pipe] content: 12～30ppm, the sonims total amount that pipe is stable: 40～80ppm.
Steel pipe finished product chemical composition permissible error meets the regulation of table 1 among the GB/222-2006.
2, steel pipe rolling
Various process parameters such as control pipe heating-up temperature, finishing temperature in the operation of rolling are to satisfy the steel tube performance index.Main technologic parameters is as follows:
The annular furnace furnace temperature must guarantee the pipe temperature of coming out of the stove: 1260 ℃ ± 10 ℃;
Finishing temperature: 890 ℃ ± 20 ℃.
3, steel pipe heat treatment
Steel pipe adopts normalizing heat treatment, and crystal grain thinning guarantees low-temperature impact toughness.Heat treatment temperature: 900 ± 10 ℃.
4, steel tube performance detects
The steel tube performance testing result sees Table 2～4:
Table 2 seamless steel pipe normal temperature of the present invention tensile property, impact property
Table 3 seamless steel pipe high-temperature short delay stretching of the present invention performance
| Heat (batch) number | Experimental temperature ℃ | Yield strength MPa | Tensile strength MPa | Reduction of cross sectional area % |
| 0983761 | 250 | 285 | 580 | ?56 |
| 0983842 | 250 | 270 | 570 | ?55 |
| 0983957 | 250 | 275 | 585 | ?57 |
Table 4 seamless steel pipe corrosion rate of the present invention
| Heat (batch) number | Cr％ | Corrosion rate (mm/) |
| 0983761 | 0.32 | 0.10 |
| 0983842 | 0.20 | 0.13 |
| 0983957 | 0.26 | 0.12 |
From table 2～4 as can be seen, the performance requirement of nuclear power pipe product and the effect of anti-" FAC (accelerated corrosion of flowing) " are satisfied in the stable performance of seamless steel tube for nuclear power of the present invention fully.
Claims (4)
1. seamless steel tube for nuclear power, it is characterized in that its chemical composition is by weight percentage: C 0.17～0.24%, Si0.17～0.37%, Mn 0.35～0.65%, and Cr 0.18～0.35%, and surplus is Fe and unavoidable impurities.
2. seamless steel tube for nuclear power according to claim 1 is characterized in that: described unavoidable impurities comprises P and S, wherein, by weight percentage, P≤0.025%, S≤0.025%.
3. seamless steel tube for nuclear power according to claim 2 is characterized in that: its chemical composition is by weight percentage: C 0.19%, and Si 0.26%, Mn 0.50%, and Cr 0.32%, and P 0.010%, S 0.006%, and surplus is Fe and unavoidable impurities.
4. produce the method for seamless steel tube for nuclear power, it is characterized in that: comprise the steps:
A, smelting pipe: smelt pipe, the chemical composition of pipe is by weight percentage: C 0.17～0.24%, and Si 0.17～0.37%, and Mn 0.35～0.65%, and Cr 0.18～0.35%, and surplus is Fe and unavoidable impurities;
B, steel pipe rolling: pipe is rolled into seamless steel pipe, and wherein, the tapping temperature when pipe is rolling is 1260 ℃ ± 10 ℃, and finishing temperature is 890 ℃ ± 20 ℃;
C, steel pipe heat treatment: the steel pipe after rolling carries out normalizing heat treatment, and heat treatment temperature is 900 ± 10 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009103120377A CN101769403B (en) | 2009-12-23 | 2009-12-23 | Seamless steel tube for nuclear power and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103120377A CN101769403B (en) | 2009-12-23 | 2009-12-23 | Seamless steel tube for nuclear power and production method thereof |
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| CN101769403A CN101769403A (en) | 2010-07-07 |
| CN101769403B true CN101769403B (en) | 2011-08-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861785A (en) * | 2012-09-25 | 2013-01-09 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN104294166A (en) * | 2014-10-08 | 2015-01-21 | 天津钢管集团股份有限公司 | Chromium-nickel microalloyed carbon steel nuclear seamless steel tube and production method thereof |
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| CN101914687B (en) * | 2010-08-31 | 2012-01-25 | 攀钢集团钢铁钒钛股份有限公司 | Electro-slag re-melting method for steel for aluminum-controlled seamless steel pipes |
| CN102864396B (en) * | 2012-09-25 | 2014-12-17 | 攀钢集团成都钢钒有限公司 | Low-alloy-steel seamless steel tube for nuclear power and production method thereof |
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| CN106931267A (en) * | 2017-03-31 | 2017-07-07 | 中核核电运行管理有限公司 | A kind of throttle orifice component of resistance to flowing accelerated corrosion |
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2009
- 2009-12-23 CN CN2009103120377A patent/CN101769403B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861785A (en) * | 2012-09-25 | 2013-01-09 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN102861785B (en) * | 2012-09-25 | 2015-04-15 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN104294166A (en) * | 2014-10-08 | 2015-01-21 | 天津钢管集团股份有限公司 | Chromium-nickel microalloyed carbon steel nuclear seamless steel tube and production method thereof |
| CN104294166B (en) * | 2014-10-08 | 2016-06-01 | 天津钢管集团股份有限公司 | The carbon steel nuclear power weldless steel tube of chromium nickel microalloying and production method thereof |
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| CN101769403A (en) | 2010-07-07 |
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