CN103215519A - Main steam pipeline for supercritical thermal power generating unit - Google Patents
Main steam pipeline for supercritical thermal power generating unit Download PDFInfo
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- CN103215519A CN103215519A CN2013101231583A CN201310123158A CN103215519A CN 103215519 A CN103215519 A CN 103215519A CN 2013101231583 A CN2013101231583 A CN 2013101231583A CN 201310123158 A CN201310123158 A CN 201310123158A CN 103215519 A CN103215519 A CN 103215519A
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Abstract
The invention relates to a main steam pipeline for a supercritical thermal power generating unit. The main steam pipeline is characterized by comprising the following chemical components in percentage by weight: 0.07-0.12% of C, 0.15-0.50% of Si, 0.30-0.55% of Mn, 8.50-9.50% of Cr, 0.30-0.60% of Mo, 0.05-0.09% of Nb, 0.15-0.25% of V, 1.50-2.00% of W, 0.0010-0.0060% of B, 0.03-0.07% of N, not more than 0.015% of P, not more than 0.005% of S, not more than 0.01% of Altot, not more than 0.003% of O, and the balance of Fe and inevitable impurities. The main steam pipeline has the advantages that novel martensite heat-resistant steel is formed by adding microalloying elements, such as W, B, V, Nb, N and the like to Cr-Mo type alloy structure steel, and has excellent anti-oxidation, strong corrosion resistance, excellent high-temperature strength and thermophysical parameters. The novel martensite heat-resistant steel is mainly applied to the main steam pipeline for the supercritical thermal power generating unit. The main steam pipeline has high production efficiency, good economic benefit and excellent popularization value, and is suitable for large-scale production.
Description
Technical field
The present invention relates to a kind of thermoelectricity ultra supercritical unit main steam line, belong to the metallurgical material field.
Background technology
Current, energy-conservation and environmental protection comes into one's own day by day, and the large vol high pressure high temperature turbosets of high-level efficiency, low emission, particularly ultra supercritical unit are the inexorable trends that China's thermal power generation " improves generating efficiency, saves primary energy source, improve environment, reduce cost of electricity-generating ".The ultra supercritical unit efficiency improves about 4% than conventional supercritical unit, carbonic acid gas will reduce discharging about 8%.The heat resistance development of material technology is depended in the development of power technology to a great extent, and the heat-stable material of excellent performance will reduce the wall thickness of pipeline greatly, improves welding property, reduces the thermal fatigue damage, and the device security reliability also can improve greatly.
The characteristics that China's thermoelectricity ultra-supercritical boiler material is used are, boiler, steam turbine manufacturing are imported technology, and employed key part material majority is selected for use by the regulation of introducing technology; Novel material is newly developed grade of steel based on Japan, especially at the high-temperature component steel; High-temperature component material is to contain the Martensite Stainless Steel of Cr9-12%; Only surpass 650 ℃ parts employing austenitic stainless steel at metal temperature.Ultra supercritical unit main steam line is that sufficiently high intensity, creep strength and creep rupture strength are arranged with the requirement of steel; Sufficiently high plasticity, toughness and rupture ductility are arranged; Requirement has good antioxidant property, and high temperature superheater and reheater are then required very good antioxidant property with tubing; Requirement has the favorable manufacturability energy, particularly welding and bending property; Favorable tissue character homogeneity; In the operating tissue property of long term high temperature stability.Therefore, develop the high temperature steel of excellent performance, satisfy the steel requirement of ultra supercritical unit main steam line, be necessary, also will have the vast market space.
Summary of the invention
The thermoelectricity ultra supercritical unit main steam line that the purpose of this invention is to provide a kind of excellent performance.
For achieving the above object, the present invention realizes by following measure:
A kind of thermoelectricity ultra supercritical unit main steam line is characterized in that the mass percent chemical ingredients of constituent material is: C 0.07～0.12; Si 0.15～0.50; Mn 0.30～0.55; Cr 8.50～9.50; Mo 0.30～0.60; Nb 0.05～0.09; V 0.15～0.25; W 1.50～2.00; B 0.0010～0.0060; N 0.03～0.07; P≤0.015; S≤0.005; Al
Tot≤ 0.01; O≤0.003, all the other are Fe and unavoidable impurities, mass percent amounts to 100%.
The thermoelectricity ultra supercritical unit steel pipe employing normalizing+tempering process of main steam line thermal treatment for wall thickness＜76mm, the normalizing Heating temperature is 1060 ± 20 ℃, soaking time is 2 min/mm, but is not less than 30min; Tempering temperature is 770 ± 10 ℃, and soaking time is not less than 1h, cools off in still air then.The steel pipe of wall thickness 〉=76mm can adopt quenching+tempering, and quenching temperature is not less than 1040 ℃, and tempering temperature is 770 ± 10 ℃, and soaking time is not less than 1h, cools off in still air then.Polynary steel is because of containing at high temperature the strong carbide forming element of solid solution substantially, in order to give full play to the effect of each element, adopt during thermal treatment to produce and go up feasible higher austenitizing Heating temperature, the lower limit of Heating temperature is 1040 ℃, and normalizing temperature is higher than 1080 ℃ and then occurs AUSTENITE GRAIN COARSENING easily.For making the pipeline austenitizing even, soaking time is 2 min/mm, but is not less than 30min.Polynary steel has stronger anti-tempering ability, in order to keep steel stablizing of performance in use, should adopt higher tempering temperature, particularly when containing Mo and B simultaneously in the steel.Therefore, adopt high tempering.Though system steel grade of the present invention has hardening capacity preferably, during thickness of steel pipe 〉=76mm, use normalizing process, possibly can't obtain desired tissue, therefore can adopt the quenching technology of big cooling rate.
C is the most tangible element of solution strengthening effect in the steel, and with the increase of C content, the intensity of steel rises, and plasticity, toughness descend.In martensitic steel, the rising of carbon content will reduce weldability, solidity to corrosion and the oxidation-resistance of steel, therefore wishes than low carbon content.But C content is low, and then intensity may not satisfy requirement.Mn mainly contains two kinds of effects, the one, deoxidation, the 2nd, alloying in steel.Mn and austenite can form unlimited solid solution, and ferrite and austenite are all had the solution strengthening effect, but the raising of Mn content reduces the weld seam impact value.Therefore Mn is controlled in 0.30～0.55% scope.Nb and V are the strong carbide forming elements, can form tiny and stable alloy carbide with carbon after the adding, and very strong dispersion-strengthened effect is arranged.Can obtain having precipitate such as carbide M at the specific heat treatment state
23C
6With MX(M=V or Nb, X=C or N) tempered martensite of type vanadium/niobium carbonitride, these precipitates improve the creep-rupture strength of material by precipitation strength.Contain 0. 030 ~ 0. 070% N in the steel, the raising of N content causes high temperature austenite stability to increase, make that ferrite content obviously reduces behind the material air cooling, while forms tiny in steel and is the nitride that disperse distributes, hinder growing up rapidly of austenite crystal, thereby make grain refining, the corresponding raising of hot strength.But also can reduce the thermoplasticity of steel in the steel during N too high levels, especially on crystal boundary, separate out, can cause embrittlement of grain boundaries, make the billet surface degradation when nitride.
Cr and Fe form continuous solid solution, form multiple carbide with C, it can replace a part of Fe and and form compound cementite (Fe, Cr)
3C, and the complicated carbide of Cr (Fe, Cr)
7C
3, (Fe, Cr)
23C
6Performance for steel has influence, particularly wear resistance significantly.Cr can improve ferritic electropotential, thereby improves its solidity to corrosion.Just have good oxidation-resistance when the Cr amount reaches 5% when containing in the steel, bring up to about 9% when containing the Cr amount, use temperature can reach 650 ℃.Therefore, it is controlled in 8.50～9.50% scopes.
The main effect of Mo is the heat resistance that improves steel, plays the effect of solution strengthening.The purposes of W in steel mainly is temper resistance, red hardness and the hot strength that increases steel, and because the wear resistance that the alloy carbide of formation increases.In steel, replace part Mo, form compound solid solution reinforcement, the long-term creep rupture strength of steel is improved based on the W-Mo of W with W.Therefore W, Mo are chosen in 1.50～2.00%, 0.30～0.60% scope.The outstanding effect of B is the hardening capacity that the B of trace just can increase steel exponentially.Mainly be that it is adsorbed on the austenite grain boundary, reduced the energy of crystal boundary, prevented the formation of ferrite nucleus, because prolonged the incubation period of proeutectoid ferrite and upper bainite transformation, it is very effective to soft steel, thus B be controlled in 0.0010～0.0060% scope more suitable.The Mo-B synergy has intensive retarding effect more to ferritic forming core on the austenite, thereby makes the austenitic transformation kinetic curve that deep the change be taken place, and causes the expansion in bainite district.B also can participate in the reaction of carbide, helps the uniform distribution and the stability thereof of carbide, thereby helps the raising of heat resistance.
S and sulfide weaken crystal boundary at grain boundary segregation, form hole, thereby cause embrittlement of grain boundaries and creep embrittlement.In addition, S in the weld seam melting area, P content are higher, will produce thermal crack in process of setting.How O, H gas content height, inclusion can seriously reduce impact value in the steel.The content of therefore strict control S, P and other harmful elements reduces O, H gas content, will make homogenization of composition simultaneously.
Advantage of the present invention is: on the basis of Cr-Mo type structural alloy steel, add micro alloying element such as W, B, V, Nb, N and form novel martensite high temperature steel, this steel has good oxidation-resistance, very strong erosion resistance, excellent hot strength and thermal physical property parameter.Product is mainly used in thermoelectricity ultra supercritical unit main steam line.Production efficiency height of the present invention, good in economic efficiency is suitable for large-scale production, has excellent generalization values.
Embodiment
Example 1
The mass percent chemical ingredients of material is: C 0.11; Si 0. 42; Mn 0.47; Cr 9.00; Mo 0.51; Nb 0.07; V 0.23; W 1.95; B 0.0040; N 0.05; P, S, Al
Tot, O content meets the System Design requirement; All the other are Fe and unavoidable impurities, and mass percent amounts to 100%.The seamless tube wall thickness of producing is 35mm, and heat treating regime is carried out by design requirements.
The tensile strength of steel pipe, yield strength, elongation after fracture, ballistic work, hardness (HB) are respectively 695MPa, 520MPa, 23.6%, 111J, 217; 600 ℃ of high-temperature yield strengths are 380MPa.In the time of 625 ℃, obtaining 100,000 h creep rupture strengths by extrapotation is 96.8MPa, antioxidant property meet 1 grade " fully oxidation-resistance " (＜0.1 g/ (m
2H)), has higher antioxidant property; The aging test of 10,000 h shows that the impelling strength of steel, hardness, intensity and plasticity index are not all seen considerable change, illustrates that this rigidity can stablize, and is suitable for making the high temperature pipe.Each type impurity rank all is not more than 1.0 grades in the steel, and the production tube grain fineness number is 8.0 grades, and microstructure is a tempered martensite.
Example 2
The mass percent chemical ingredients of material is: C 0.09; Si 0. 39; Mn 0.52; Cr 9.10; Mo 0.52; Nb 0.07; V 0.22; W 1.93; B 0.0040; N 0.06; P, S, Al
Tot, O content meets the System Design requirement; All the other are Fe and unavoidable impurities, and mass percent amounts to 100%.The seamless tube wall thickness of producing is 35mm, and heat treating regime is carried out by design requirements.
The tensile strength of steel pipe, yield strength, elongation after fracture, ballistic work, hardness (HB) are respectively 705MPa, 535MPa, 25.2%, 120J, 211; 600 ℃ of high-temperature yield strengths are 375MPa.Each type impurity rank all is not more than 1.5 grades in the steel, and the production tube grain fineness number is 7.5 grades, and microstructure is a tempered martensite.
Example 3
The mass percent chemical ingredients of material is: C 0.10; Si 0. 43; Mn 0.50; Cr 9.04; Mo 0.49; Nb 0.06; V 0.21; W 1.96; B 0.0050; N 0.06; P, S, Al
Tot, O content meets the System Design requirement; All the other are Fe and unavoidable impurities, and mass percent amounts to 100%.The seamless tube wall thickness of producing is 43mm, and heat treating regime is carried out by design requirements.
The tensile strength of steel pipe, yield strength, elongation after fracture, ballistic work, hardness (HB) are respectively 685MPa, 510MPa, 24.1%, 108J, 198; 600 ℃ of high-temperature yield strengths are 369MPa.Each type impurity rank all is not more than 1.0 grades in the steel, and the production tube grain fineness number is 8.5 grades, and microstructure is a tempered martensite.
Example 4
The mass percent chemical ingredients of material is: C 0.10; Si 0. 44; Mn 0.51; Cr 9.13; Mo 0.53; Nb 0.07; V 0.19; W 1.89; B 0.0050; N 0.05; P, S, Al
Tot, O content meets the System Design requirement; All the other are Fe and unavoidable impurities, and mass percent amounts to 100%.The seamless tube wall thickness of producing is 37mm, and heat treating regime is carried out by design requirements.
The tensile strength of steel pipe, yield strength, elongation after fracture, ballistic work, hardness (HB) are respectively 695MPa, 520MPa, 26.5%, 112J, 203; 600 ℃ of high-temperature yield strengths are 377MPa.Each type impurity rank all is not more than 1.0 grades in the steel, and the production tube grain fineness number is 8.0 grades, and microstructure is a tempered martensite.
Claims (1)
1. a thermoelectricity ultra supercritical unit main steam line is characterized in that the mass percent chemical ingredients of constituent material is: C 0.07～0.12; Si 0.15～0.50; Mn 0.30～0.55; Cr 8.50～9.50; Mo 0.30～0.60; Nb 0.05～0.09; V 0.15～0.25; W 1.50～2.00; B 0.0010～0.0060; N 0.03～0.07; P≤0.015; S≤0.005; Al
Tot≤ 0.01; O≤0.003, all the other are Fe and unavoidable impurities, mass percent amounts to 100%; The described thermoelectricity ultra supercritical unit steel pipe employing normalizing+tempering process of main steam line thermal treatment for wall thickness＜76mm, the normalizing Heating temperature is 1060 ± 20 ℃, soaking time is 2 min/mm, but is not less than 30min; Tempering temperature is 770 ± 10 ℃, and soaking time is not less than 1h, cools off in still air then; The steel pipe of wall thickness 〉=76mm adopts quenching+tempering, and quenching temperature is not less than 1040 ℃, and tempering temperature is 770 ± 10 ℃, and soaking time is not less than 1h, cools off in still air then.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525984A (en) * | 2013-09-26 | 2014-01-22 | 无锡阳工机械制造有限公司 | Heat treatment method of heat-resistant steel |
| CN103614524A (en) * | 2013-12-09 | 2014-03-05 | 钢铁研究总院 | Heat treatment method for obtaining high durability of martensite heat-resistant steel |
| CN109048119A (en) * | 2018-08-30 | 2018-12-21 | 天津重型装备工程研究有限公司 | A kind of 650 DEG C of ultra supercritical thermal power steam turbine steel-casting solid welding wires |
| CN109207845A (en) * | 2017-06-30 | 2019-01-15 | 宝钢特钢有限公司 | A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method |
| CN109554629A (en) * | 2017-09-27 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of ultra supercritical coal-fired unit steel and preparation method thereof |
| CN109763066A (en) * | 2019-01-18 | 2019-05-17 | 东方电气集团东方汽轮机有限公司 | A kind of ultra-high parameter steam turbine key hot-end component New Heat-Resistant Steel |
| CN110629110A (en) * | 2018-06-25 | 2019-12-31 | 宝山钢铁股份有限公司 | Steel for ultra-supercritical thermal power generating unit with steam corrosion oxidation resistance and good high-temperature durability and preparation method thereof |
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| JPS61231139A (en) * | 1985-04-06 | 1986-10-15 | Nippon Steel Corp | Heat resistant ferritic steel of high strength |
| JPH09310121A (en) * | 1996-05-17 | 1997-12-02 | Nippon Steel Corp | Production of martensitic seamless heat resistant steel tube |
| JPH10287960A (en) * | 1997-04-18 | 1998-10-27 | Nippon Steel Corp | High chromium ferritic steel |
| JPH11226738A (en) * | 1998-02-13 | 1999-08-24 | Nkk Corp | Method for welding high-cr ferritic heat resisting steel and production of its welded steel tube |
| CN101956055A (en) * | 2010-10-19 | 2011-01-26 | 钢铁研究总院 | Heat treatment method of large-diameter thick-walled heat-resistant steel pipe |
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2013
- 2013-04-10 CN CN2013101231583A patent/CN103215519A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61231139A (en) * | 1985-04-06 | 1986-10-15 | Nippon Steel Corp | Heat resistant ferritic steel of high strength |
| JPH09310121A (en) * | 1996-05-17 | 1997-12-02 | Nippon Steel Corp | Production of martensitic seamless heat resistant steel tube |
| JPH10287960A (en) * | 1997-04-18 | 1998-10-27 | Nippon Steel Corp | High chromium ferritic steel |
| JPH11226738A (en) * | 1998-02-13 | 1999-08-24 | Nkk Corp | Method for welding high-cr ferritic heat resisting steel and production of its welded steel tube |
| CN101956055A (en) * | 2010-10-19 | 2011-01-26 | 钢铁研究总院 | Heat treatment method of large-diameter thick-walled heat-resistant steel pipe |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525984A (en) * | 2013-09-26 | 2014-01-22 | 无锡阳工机械制造有限公司 | Heat treatment method of heat-resistant steel |
| CN103614524A (en) * | 2013-12-09 | 2014-03-05 | 钢铁研究总院 | Heat treatment method for obtaining high durability of martensite heat-resistant steel |
| CN109207845A (en) * | 2017-06-30 | 2019-01-15 | 宝钢特钢有限公司 | A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method |
| CN109554629A (en) * | 2017-09-27 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of ultra supercritical coal-fired unit steel and preparation method thereof |
| CN110629110A (en) * | 2018-06-25 | 2019-12-31 | 宝山钢铁股份有限公司 | Steel for ultra-supercritical thermal power generating unit with steam corrosion oxidation resistance and good high-temperature durability and preparation method thereof |
| CN109048119A (en) * | 2018-08-30 | 2018-12-21 | 天津重型装备工程研究有限公司 | A kind of 650 DEG C of ultra supercritical thermal power steam turbine steel-casting solid welding wires |
| CN109763066A (en) * | 2019-01-18 | 2019-05-17 | 东方电气集团东方汽轮机有限公司 | A kind of ultra-high parameter steam turbine key hot-end component New Heat-Resistant Steel |
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Application publication date: 20130724 |