CN102864375B - Carbon steel seamless steel tube for nuclear power and production method thereof - Google Patents
Carbon steel seamless steel tube for nuclear power and production method thereof Download PDFInfo
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- CN102864375B CN102864375B CN201210359279.3A CN201210359279A CN102864375B CN 102864375 B CN102864375 B CN 102864375B CN 201210359279 A CN201210359279 A CN 201210359279A CN 102864375 B CN102864375 B CN 102864375B
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Abstract
The invention provides a carbon steel seamless steel tube for third-generation nuclear power and a production method of the carbon steel seamless steel tube. The production method comprises the following steps of: a, smelting a tube blank, and the tube blank is prepared by chemical components in percentage by weight: 0.18-0.22% of C, 0.20-0.35% of Si, 0.45-0.63% of Mn, 0-0.10% of Cr, 0-0.10% of Ni, 0-0.05% of Mo, 0-0.10% of Cu, 0-0.015% of As, 0-0.010% of Sn, 0-0.015% of P, 0-0.010% of S and the balance of Fe and inevitable impurities; and b, rolling the tube blank to be a seamless steel tube, enabling the temperature for discharging from a heating furnace before the tube blank is rolled to be 1220-1260 DEG C, enabling a finishing temperature to be 860-900DEG C. A normal temperature mechanical property, a normal temperature impact property, a 350 DEG C high temperature tensile property and steel purity degree of the carbon steel seamless steel tube can completely meet technical requirements for seamless steel tubes of third-generation nuclear power plant units.
Description
Technical field
The present invention relates to weldless steel tube technical field, more particularly, relate to carbon steel weldless steel tube and production method thereof for a kind of generation Ⅲ nuclear power.
Background technology
The principle of design of generation Ⅲ nuclear power unit, on the basis of the tachnical storage that adopts s-generation nuclear power generating sets to accumulate and service experience, for its weak point, further adopt through the feasible new technology of exploitation checking, significantly to improve its security and economy.The core melt probability of AP1000 and radioactivity discharge approximately low 2 magnitudes of the existing s-generation nuclear power generating sets of likelihood ratio in a large number, fully demonstrated the superiority of generation Ⅲ nuclear power technology, the risk of a two generations nuclear power generating sets generation major accident will be equivalent to the risk of more than 100 generation Ⅲ nuclear power unit generation major accident.Generation Ⅲ nuclear power technology has adopted a lot of major accident preventions and mitigation strategy, the probability outwards discharging to reduce core melt and a large amount of radioactivity, to prevent the gentle major accident of separating as design basis, the possibility of its generation is dropped to extremely low, meet the requirement of the existing nuclear safety codes of China and international safety standard completely.
Therefore, nuclear power pipe is very high to tube material specification of quality, and require to adopt different weldless steel tubes according to purposes, generation Ⅲ nuclear power unit has adopted carbon steel weldless steel tube, require weldless steel tube to there is good ambient temperature mechanical properties, normal temperature impact property and 350 ℃ of high temperature tensile properties and high purity of steel, therefore need the chemical composition of particular design weldless steel tube.
Summary of the invention
For prior art above shortcomings, one of object of the present invention is to provide a kind of generation Ⅲ nuclear power carbon steel weldless steel tube, this weldless steel tube has good ambient temperature mechanical properties, normal temperature impact property and 350 ℃ of high temperature tensile properties, can meet technical requirements and the service requirements of Nuclear power plants.
An aspect of of the present present invention provides the production method of a kind of nuclear power with carbon steel weldless steel tube, described production method comprises step: a, smelting pipe, the chemical composition of described pipe is by weight percentage: C 0.18～0.22%, Si 0.20～0.35%, Mn 0.45～0.63%, Cr 0～0.10%, Ni 0～0.10%, Mo 0～0.05%, Cu 0～0.10%, and As 0～0.015%, and Sn 0～0.010%, P 0～0.015%, the Fe of S 0～0.010% and surplus and inevitably impurity; B, billet production is become to weldless steel tube, before rolling, the temperature that goes out process furnace of pipe is 1220～1260 ℃, controls finishing temperature and protects product mechanical property, and finishing temperature is 860～900 ℃.
Preferably, the chemical composition of described pipe is by weight percentage: C 0.20%, and Si 0.28%, and Mn 0.55%, Cr 0.05%, Ni 0.04%, and Mo 0.03%, and Cu 0.08%, As 0.012%, Sn 0.008%, and P 0.010%, the Fe of S 0.008% and surplus and inevitably impurity.
Another aspect of the present invention provides a kind of nuclear power carbon steel weldless steel tube, the chemical composition of described carbon steel weldless steel tube is by weight percentage: C 0.18～0.22%, and Si 0.20～0.35%, and Mn 0.45～0.63%, Cr 0～0.10%, Ni 0～0.10%, and Mo 0～0.05%, and Cu 0～0.10%, As 0～0.015%, Sn 0～0.010%, and P 0～0.015%, the Fe of S 0～0.010% and surplus and inevitably impurity.
Preferably, the chemical composition of described carbon steel weldless steel tube is by weight percentage: C 0.20%, and Si 0.28%, and Mn 0.55%, Cr 0.05%, Ni 0.04%, and Mo 0.03%, and Cu 0.08%, As 0.012%, Sn 0.008%, and P 0.010%, the Fe of S 0.008% and surplus and inevitably impurity.
Compared with prior art, beneficial effect of the present invention comprises: a kind of nuclear power carbon steel weldless steel tube is provided, the ambient temperature mechanical properties of this carbon steel weldless steel tube, normal temperature impact property and 350 ℃ of high temperature tensile properties and purity of steel, meet the technical requirements of weldless steel tube for the unit of generation Ⅲ nuclear power station completely.Specifically, described carbon steel weldless steel tube yield strength is at normal temperatures not less than 325MPa, tensile strength and is not less than the ballistic work that 480MPa, unit elongation be not less than 34%, 20 ℃ and is not less than 116J, and its yield strength at 350 ℃ is not less than, and 215MPa, tensile strength are not less than 465MPa, unit elongation is not less than 31%.
Embodiment
Hereinafter, in connection with exemplary embodiment, describe carbon steel weldless steel tube and production method thereof for nuclear power of the present invention in detail.
Nuclear power according to an aspect of the present invention comprises step by the production method of carbon steel weldless steel tube: a, smelting pipe, the chemical composition of described pipe is by weight percentage: C 0.18～0.22%, and Si 0.20～0.35%, and Mn 0.45～0.63%, Cr 0～0.10%, Ni 0～0.10%, and Mo 0～0.05%, and Cu 0～0.10%, As 0～0.015%, Sn 0～0.010%, P≤0.015%, the Fe of S≤0.010% and surplus and inevitably impurity; B, billet production is become to weldless steel tube, before rolling, the temperature that goes out process furnace of pipe is 1220～1260 ℃, controls finishing temperature and protects product mechanical property, and finishing temperature is 860～900 ℃.
Preferably, the chemical composition of described pipe is by weight percentage: C 0.20%, and Si 0.28%, and Mn 0.55%, Cr 0.05%, Ni 0.04%, and Mo 0.03%, and Cu 0.08%, As 0.012%, Sn 0.008%, and P 0.010%, the Fe of S 0.008% and surplus and inevitably impurity.
Nuclear power according to a further aspect of the invention by the chemical composition of carbon steel weldless steel tube is by weight percentage: C 0.18～0.22%, Si 0.20～0.35%, Mn 0.45～0.63%, and Cr 0～0.10%, and Ni 0～0.10%, Mo 0～0.05%, Cu 0～0.10%, and As 0～0.015%, and Sn 0～0.010%, P 0～0.015%, the Fe of S 0～0.010% and surplus and inevitably impurity.
Further, in order to make steel pipe purity higher, meet normal temperature impact property and 350 ℃ of high temperature tensile properties that steel pipe is used, preferably, the chemical composition of described carbon steel weldless steel tube is by weight percentage: C 0.20%, and Si 0.28%, Mn 0.55%, and Cr 0.05%, and Ni 0.04%, Mo 0.03%, Cu 0.08%, and As 0.012%, and Sn 0.008%, P 0.010%, the Fe of S 0.008% and surplus and inevitably impurity.
The chemical Composition Control scope that the present invention chooses is normal temperature impact property and the 350 ℃ of high temperature tensile properties the bests that guarantee weldless steel tube, and C, Mn content are higher than chemical composition set upper limit, and the normal temperature impelling strength of weldless steel tube is low, and unit elongation is low; The lower limit that C, Mn content are stipulated lower than chemical composition, tensile strength and the yield strength of weldless steel tube are low; The high irradiation of Cu content causes Cu fracture.Therefore the chemical composition scope of selecting, had both guaranteed the mechanical property of carbon steel weldless steel tube for nuclear power, also guaranteed the use properties of product.
Nuclear power is very high with carbon steel weldless steel tube performance requriements, except requiring tensile mechanical properties, has increased impelling strength and high-temperature behavior requirement, therefore must control finishing temperature, guarantees that the properties of hot finished steel pipe meets the service requirements of nuclear power pipe.Limiting above-mentioned finishing temperature is that the ferrite, the perlite that after cooling phase-change, form are even in order to guarantee that viscous deformation completes in austenite region, reach normalizing state and organize level, thus the property requirement of assurance nuclear power pipe.
If Heating temperature is greater than 1260 ℃, be conducive to the organization of production direct motion of tube rolling, but finishing temperature is high, after rolling, be cooled to time length, the coarse grains of transformation temperature, product performance are difficult to guarantee; Heating temperature is lower than 1220 ℃, and finishing temperature is low, is also difficult to guarantee product performance.
In one exemplary embodiment of the present invention, nuclear power also can be realized in the following manner by the production method of carbon steel weldless steel tube:
A, smelting pipe: smelt pipe, the chemical composition of pipe is by weight percentage: C 0.18～0.22%, Si 0.20～0.35%, and Mn 0.45～0.63%, and Cr 0～0.10%, Ni 0～0.10%, Mo 0～0.05%, and Cu 0～0.10%, and As 0～0.015%, Sn 0～0.010%, and surplus is Fe and inevitable impurity;
B, steel pipe rolling: billet production is become to weldless steel tube, 1220～1260 ℃ of the tapping temperatures of pipe during rolling, finishing temperature is 880 ℃ ± 20 ℃.
All the other steps of producing above-mentioned weldless steel tube are identical with the production method of conventional weldless steel tube.
Below in conjunction with concrete example, the present invention is carried out to exemplary illustration.
1, smelt pipe
By smelting and continuous casting, obtain the pipe of example 1 to 3.The chemical composition of the pipe of example 1 to 3 is as shown in table 1.
The chemical composition (wt%) of the pipe of table 1 example 1 to 3
| Example | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 1 | 0.18 | 0.27 | 0.63 | 0.007 | 0.006 | 0.09 | 0.03 | 0.10 | 0.04 |
| 2 | 0.20 | 0.28 | 0.55 | 0.009 | 0.004 | 0.05 | 0.04 | 0.09 | 0.03 |
| 3 | 0.22 | 0.20 | 0.45 | 0.008 | 0.003 | 0.03 | 0.02 | 0.07 | 0.01 |
In smelting, external refining, casting cycle, in strict accordance with standard, operate, make the chemical composition of steel even, steel is pure, to guarantee the performance of steel pipe.
2, steel pipe rolling
In the operation of rolling, control the various processing parameters such as pipe Heating temperature, finishing temperature, to meet steel tube performance index.Main technologic parameters is as follows:
Ring furnace furnace temperature must guarantee the pipe temperature of coming out of the stove: 1220～1260 ℃, finishing temperature is 880 ℃ ± 20 ℃.
3, steel tube performance detects
The nuclear power of example 1-3 uses the performance test results of carbon steel weldless steel tube in Table 2～table 4.
Normal tensile property, the impact property of the weldless steel tube of table 2 example 1-3
| Example | Yield strength/MPa | Tensile strength/MPa | Unit elongation/% | Impact temperature/℃ | Ballistic work/J |
| 1 | 325 | 480 | 34 | 20 | 126 |
| 2 | 330 | 485 | 36 | 20 | 122 |
| 3 | 335 | 495 | 39 | 20 | 116 |
350 ℃ of high temperature tensile properties of the weldless steel tube of table 3 example 1-3
| Example | Yield strength/MPa | Tensile strength/MPa | Unit elongation/% |
| 1 | 235 | 465 | 37 |
| 2 | 220 | 480 | 36 |
| 3 | 215 | 495 | 31 |
The stable nonmetal inclusion check rank of weldless steel tube of table 4 example 1-3
From table 2～table 4, can find out, used in nuclear power station carbon steel weldless steel tube steel of the present invention is pure, having on high-intensity basis, has good impelling strength simultaneously, meets the design specifications requirement of carbon steel weldless steel tube for generation Ⅲ nuclear power station completely.Specifically, nuclear power of the present invention is not less than 325MPa, tensile strength by carbon steel weldless steel tube yield strength at normal temperatures and is not less than the ballistic work that 480MPa, unit elongation be not less than 34%, 20 ℃ and is not less than 116J, and its yield strength at 350 ℃ is not less than, and 215MPa, tensile strength are not less than 465MPa, unit elongation is not less than 31%.
In sum, the ambient temperature mechanical properties of carbon steel weldless steel tube for nuclear power of the present invention, normal temperature impact property and 350 ℃ of high temperature tensile properties and purity of steel, meet the technical requirements of weldless steel tube for the unit of generation Ⅲ nuclear power station completely.The present invention, for generation Ⅲ nuclear power station unit provides a kind of new selection with weldless steel tube, has broad application prospects.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skills should be clear, in the situation that do not depart from the spirit and scope of claim, can carry out various modifications to above-described embodiment.
Claims (5)
1. a production method for carbon steel weldless steel tube for nuclear power, is characterized in that, described production method comprises step:
A, smelting pipe, the chemical composition of described pipe is by weight percentage: C0.18～0.22%, Si0.20～0.35%, Mn0.45～0.63%, Cr0～0.10%, Ni0.02～0.10%, Mo0.01～0.05%, Cu0～0.10%, As0～0.015%, Sn0～0.010%, P0～0.015%, the Fe of S0～0.010% and surplus and inevitably impurity;
B, billet production is become to weldless steel tube, before rolling, the temperature that goes out process furnace of pipe is 1220～1260 ℃, and finishing temperature is 860～900 ℃.
2. the production method of carbon steel weldless steel tube for nuclear power according to claim 1, is characterized in that, the chemical composition of described pipe is by weight percentage: C0.20%, Si0.28%, Mn0.55%, Cr0.05%, Ni0.04%, Mo0.03%, Cu0.08%, As0.012%, Sn0.008%, P0.010%, the Fe of S0.008% and surplus and inevitably impurity.
3. a nuclear power carbon steel weldless steel tube, is characterized in that, the chemical composition of described carbon steel weldless steel tube is by weight percentage: C0.18～0.22%, Si0.20～0.35%, Mn0.45～0.63%, Cr0～0.10%, Ni0.02～0.10%, Mo0.01～0.05%, Cu0～0.10%, As0～0.015%, Sn0～0.010%, P0～0.015%, the Fe of S0～0.010% and surplus and inevitably impurity.
4. nuclear power according to claim 3 carbon steel weldless steel tube, is characterized in that, the chemical composition of described carbon steel weldless steel tube is by weight percentage: C0.20%, Si0.28%, Mn0.55%, Cr0.05%, Ni0.04%, Mo0.03%, Cu0.08%, As0.012%, Sn0.008%, P0.010%, the Fe of S0.008% and surplus and inevitably impurity.
5. nuclear power according to claim 3 carbon steel weldless steel tube, it is characterized in that, described carbon steel weldless steel tube yield strength is at normal temperatures not less than 325MPa, tensile strength and is not less than the ballistic work that 480MPa, unit elongation be not less than 34%, 20 ℃ and is not less than 116J, and its yield strength at 350 ℃ is not less than, and 215MPa, tensile strength are not less than 465MPa, unit elongation is not less than 31%.
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| CN104451412A (en) * | 2014-09-22 | 2015-03-25 | 安徽喜洋洋儿童用品有限公司 | Seamless steel tube for baby stroller |
| CN114717476B (en) * | 2022-03-11 | 2023-11-21 | 天津钢管制造有限公司 | Method for improving performance of rolled carbon steel seamless steel tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1343798A (en) * | 2000-09-16 | 2002-04-10 | 江苏江河集团电力工程公司 | Centrifugal casting technology for manufacturing cold drawn seamless pipe of ultralow-carbon dual-phase stainless steel |
| CN101769403A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Seamless steel tube for nuclear power and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1343798A (en) * | 2000-09-16 | 2002-04-10 | 江苏江河集团电力工程公司 | Centrifugal casting technology for manufacturing cold drawn seamless pipe of ultralow-carbon dual-phase stainless steel |
| CN101769403A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Seamless steel tube for nuclear power and production method thereof |
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