CN102808136A - Manufacturing method for filter net body material of ultra-supercritical turbine in megawatt unit - Google Patents
Manufacturing method for filter net body material of ultra-supercritical turbine in megawatt unit Download PDFInfo
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- CN102808136A CN102808136A CN2012102910178A CN201210291017A CN102808136A CN 102808136 A CN102808136 A CN 102808136A CN 2012102910178 A CN2012102910178 A CN 2012102910178A CN 201210291017 A CN201210291017 A CN 201210291017A CN 102808136 A CN102808136 A CN 102808136A
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Abstract
The invention provides a manufacturing method for a filter net body material of a bypass valve in a 1,000 megawatt ultra-supercritical turbine, and belongs to the field of metal materials. Alloy components are further designed and optimized on the basis of 1Cr13 and 10Cr9Mo1VNb alloys, a new alloy component is designed by adding a proper amount of W elements and controlling the W-to-Mo ratio and the contents of C, V and Cr in the alloys, and corresponding key manufacturing steps of smelting, electroslag treatment, forging and heat treatment and the like are determined. The performance of the filter net body material manufactured by the manufacturing method is improved at both room temperature and high temperature, so that the performance requirements of the ultra-supercritical turbine in a megawatt unit on the filter net body material can be met, and the safety and the reliability of the bypass valve of the turbine and the whole turbine are effectively guaranteed.
Description
Technical field
The invention belongs to metal material field, relate to a kind of method of manufacture of preparation 1,000,000 unit supercritical turbine strainer body materials.
Background technology
In the power industry, thermal power generation is at dominate worldwide still from now on and for a long time, and unit constantly develops towards large vol, high-parameters, energy-efficient direction.After reaching, China's Eleventh Five-Year Plan also attaches most importance to development 600MW, the above supercritical turbine of 1000MW.The performance that continues to increase associated materials of unit capacity has proposed continual high request.Valve one of is formed as most critical in the turbine, along with improving constantly of working temperature and pressure, the performance of intraware material and processing, the assembly precision of assembly is also had higher requirement.Therefore, the ultra supercritical technical development the most important thing is the research and development of high strength at high temperature novel material.Can be provided at the special metal material that moves under the severe rugged environments such as HTHP, be the key factor that the ultra supercritical fired power generating unit is applied.Development ultra supercritical unit has many key technical problems in the sharp manufacturing of design, wherein developing hot strength height, the oxidation corrosion of high temperature resistance flue gas and high temperature carbonated drink dielectric corrosion, weldability and good, the cheap material of manufacturability is the problem of most critical.
The main effect of supercritical turbine by-pass valve (comprising septum valve, valve, middle pressure-controlled valve, variable valve etc.) is that the pressure of dynamic conditioning and the interior gas of control cylinder keeps constant, and is stable with the output rating that guarantees generator.Therefore can steady operation in order to ensure turbine, valve must have high working reliability, and this has excellent performance with regard to the associated component that requires valve.Variable valve or valve normally are made up of several big key components such as valve rod, valve seat, valve disc, steam filter screens; Wherein to work mainly to prevent that impurity such as outer solid particle from getting into turbine from live steam piping inner for steam filter screen; It is positioned at the top in stop valve chamber; Surround valve and valve seat, when in valve casing, installing, it and top and valve seat are running fit.Steam filter screen mainly is made up of three parts: smart net, perforated plate and strainer body.Wherein the main effect of strainer body is to support smart net and perforated plate, requires in the ultra supercritical working order, and promptly internal vapor pressure surpasses 30MPa, temperature surpasses 600 ℃, still has certain intensity and toughness, has good anti-steam corrosion property simultaneously.In subcritical pressure turbine, the work condition environment of strainer body is vapor pressure 17MPa, 540 ℃ of vapor temperatures; The material of strainer body extensively adopts the 1Cr13 steel, and 1Cr13 has higher hardness, toughness; Rotproofness preferably, heat resistance and cold deformation performance, damping property is also fine; Its room temperature tensile strength >=540MPa, ys >=345MPa, ballistic work >=78J.In supercritical pressure turbine, the working temperature of strainer body is 567 ℃, and vapor pressure is 25.5MPa; Adopt the 1Cr13 steel not meet the demands, on the basis of 1Cr13 steel, pass through suitably to reduce C content, and add elements such as V, Nb, Mo; Can improve the stability and the hot strength of tissue, the 10Cr9Mo1VNb steel that promptly adopts at present extensively is as supercritical pressure turbine strainer body material, its room temperature tensile strength >=580MPa; Ys >=415MPa, ballistic work >=68J.For supercritical turbine, the working temperature of strainer body reaches 600 ℃, and pressure reaches 30MPa, requires strainer body to have higher creep rupture strength, and creep rupture strength should be higher than 200MPa under 600 ℃, 100h condition, has excellent corrosion resistance simultaneously.10Cr9Mo1VNb steel creep rupture strength in the time of 600 ℃ is 175MPa (100h), 95MPa (1000h), therefore adopts the 10Cr9Mo1VNb steel can not satisfy the supercritical turbine technical requirements, must develop to have more high performance strainer body material.
Summary of the invention
The object of the invention provides a kind of dependable performance, lower-cost strainer body material and preparation method thereof.Mainly be to be the basis,, add an amount of W element through improving C content with alloy 10Cr9Mo1VNb; And the ratio value of adjustment W and Mo; Form the W-Mo compound solid solution and strengthen and the WC precipitation strength, and eliminate the red brittleness that single Mo element brings, increase the high temperature and creep resistance intensity and the creep rupture strength of alloy; In addition the content of Cr and V is adjusted; And formulated rational heat treatment technology; Can fully utilize strengthening mechanisms such as lath martensite reinforcement, grain-boundary strengthening, particle dispersion precipitation strength and solution strengthening and increase substantially the high-temperature behavior of alloy; Especially under the precondition that does not influence corrosion resistance, improve the high temperature endurance performance of alloy, satisfy the job requirement of supercritical turbine.
A kind of 1,000,000 in watt method of manufacture of supercritical turbine by-pass valve strainer body material; It is characterized in that on the basis of 1Cr13 and 10Cr9Mo1VNb alloy, having added an amount of W element; And the content of C, V and Cr in the ratio of control W and Mo and the alloy; And mate corresponding smelting, electroslag, forging and thermal treatment process, content comprises:
1) the composition weight percent of strainer body material is:
C:0.2～0.25%, Si:0.25～0.5%, Mn:0.25～0.7%, Cr:11～13%, Ni:0.3～0.7%, Mo:0.8～1.6%, V:0.2～0.35%, W:0.4～0.8%, Nb:0.02～0.05%; P and S all less than 0.02%, surplus is Fe, wherein the ratio of Mo and W content is 2: 1;
2) alloy smelting: according to above-mentioned alloying constituent requirement, choose starting material, carry out melting then; Vacuum metling is adopted in the melting of this alloy, carries out the esr refining then.Esr purified slag system prescription is (weight percent): Al
2O
3Be 35-45%; CaO is 40-55%; MgO is 5-10%; SiO
2Be 10-15%;
3) alloy forging: during alloy forging, it is 1180～1200 ℃ that workpiece is gone into the stove holding temperature, and soaking time is according to the standard of 0.2h/cm and combine the actual (real) thickness of forging to confirm; The deflection of alloy was controlled at 15～20% scopes when first fire forged; The each forging deformation amount span of control of the second fire beginning is 40～60%, and pier pulls out forging stock 2～3 times repeatedly, and forging ratio is reached more than 4, and the final forging temperature of last fiery alloy is 870 ℃, and deflection is controlled to be 30%;
4) forge the post-heat-treated system: forging and molding is gone into stove with forging and is carried out annealing recrystallization in 950～970 ℃ of insulations after finishing, and eliminates forging stress simultaneously, and soaking time is according to the standard of 0.5h/cm and combine the actual (real) thickness of forging to confirm; Insulation is chilled to the air cooling of coming out of the stove below 300 ℃ with workpiece with stove after finishing;
5) forging performance thermal treatment: will forge the annealed workpiece surface rough turn after; Carry out UT, remove all defect that the surface exists, carry out property heat treatment after qualified; I.e. quenching+temper; Quenching temperature is 950～970 ℃ and carries out oil cooling, and temperature rise rate is controlled to be 7～10 ℃/min, and the soaking time establishing criteria is 1h/cm; 700～720 ℃ of air coolings of tempering temperature, temperature rise rate is controlled to be 7～10 ℃/min, and the soaking time establishing criteria is 1.5h/cm.
In a word; The strainer body material that adopts ME of the present invention to make, owing to added an amount of W element, and the ratio of W and Mo is controlled; Simultaneously the forging ratio of the electroslag slag system of alloy, forging process and thermal treatment process etc. are carried out emphasis control; Further improved the creep rupture strength and the impact property of alloy, satisfied the performance requriements of 1,000,000 supercritical turbine units, guaranteed the security and the safety of turbine bypass valve work the strainer body material.
Embodiment:
(1) making specification is the strainer body of Φ 581 (external diameter)/Φ 479 (internal diameter) * 522mm (length), and weight is about 100kg
At first according to dimensional requirement, design blank dimension specification is Φ 585 (external diameter)/Φ 475 (internal diameter) * 528mm, and blank weight is about 110kg.According to blank weight, and combine the composition of concrete alloying element to require to prepare burden, adopt vacuum medium frequency induction furnace to carry out melting, carry out esr then, the specification of electric slag refusion ingot is Φ 300 * 200mm, and the slag system prescription is Al
2O
3Be 35%; CaO is 50%; MgO is 5%; SiO
2Be 10%.Table 1 is the actual measurement composition of alloy behind the electroslag, and contrasts with the composition of the present invention design, can find out that all alloying elements are all within scope of the present invention.
Table 1 chemical ingredients (weight percent %)
When resmelting ingot forges, at first go into stove and heat, Heating temperature is 1190 ℃, and soaking time is 4h, makes the abundant heat penetration of steel billet, and realizes the further diffusion of inner alloying element, makes internal component more even.Carry out first fire after insulation finishes and forge, the first fiery deflection is controlled at 15%, makes coarse grain and precipitate obtain preliminary fragmentation; Second fire begins to increase the deflection of forging stock, and pier pulls out alloy 3 times repeatedly, and controls every fiery deflection and reach 40%, and final forging ratio reaches more than 4, and the final forging temperature of last fiery alloy is 900 ℃, and deflection is controlled to be 40%.After forging finishes workpiece is put into 970 ℃ of electric furnaces and be incubated 3h (thickness of workpiece is 55mm), and cool to the air cooling of coming out of the stove below 300 ℃ with the furnace.Carry out roughing after work-piece cools to the room temperature, and carry out the ultrasonic surface flaw detection, after ultrasonic inspection is qualified, carry out property heat treatment.The property heat treatment process is: the qualified workpiece of at first will detecting a flaw is gone into stove (furnace temperature is less than 300 ℃) and is warming up to 950 ℃ with stove by the speed of 10 ℃/min; Be incubated 5h then; The oil cooling of coming out of the stove; Once more workpiece is gone into stove (furnace temperature is less than 300 ℃) after the quenching and be warming up to 720 ℃ with stove by the speed of 10 ℃/min and carry out tempering, tempering insulation time 8.25h is chilled to room temperature with stove then.
By the material that above-mentioned technology is made, carry out the test of room temperature and mechanical behavior under high temperature, the mechanical performance index that reaches is with as shown in table 2 below, and table 2 has listed file names with the performance that standard-required value and 1Cr13 and 10Cr9Mo1VNb can reach.Thus it is clear that, the performance that the material composition and the ME that adopt the present invention to design, the performance of prepared material all are above standard and require.
Table 2 measured performance value with require performance index
Claims (1)
1. the method for manufacture of a gigawatt supercritical turbine by-pass valve strainer body material; It is characterized in that on the basis of 1Cr13 and 10Cr9Mo1VNb alloy, having added an amount of W element; And the content of C, V and Cr in the ratio of control W and Mo and the alloy; And mate corresponding smelting, electroslag, forging and thermal treatment process, content comprises:
1) the composition weight percent of strainer body material is:
C:0.2～0.25%, Si:0.25～0.5%, Mn:0.25～0.7%, Cr:11～13%, Ni:0.3～0.7%, Mo:0.8～1.6%, V:0.2～0.35%, W:0.4～0.8%, Nb:0.02～0.05%; P and S be little, in 0.02%, surplus is Fe, wherein the ratio of Mo and W content is 2: 1;
2) alloy smelting: according to above-mentioned alloying constituent requirement, choose starting material, carry out melting then; Vacuum metling is adopted in the melting of this alloy, carries out the esr refining then.Esr purified slag system prescription is (weight percent): Al
2O
3Be 35-45%; CaO is 40-55%; MgO is 5-10%; SiO
2Be 10-15%;
3) alloy forging: during alloy forging, it is 1180～1200 ℃ that workpiece is gone into the stove holding temperature, and soaking time is according to the standard of 0.2h/cm and combine the actual (real) thickness of forging to confirm; The deflection of alloy was controlled at 15～20% scopes when first fire forged; The each forging deformation amount span of control of the second fire beginning is 40～60%, and pier pulls out forging stock 2～3 times repeatedly, and forging ratio is reached more than 4, and the final forging temperature of last fiery alloy is 870 ℃, and deflection is controlled to be 30%;
4) forge the post-heat-treated system: forging and molding is gone into stove with forging and is carried out annealing recrystallization in 950～970 ℃ of insulations after finishing, and eliminates forging stress simultaneously, and soaking time is according to the standard of 0.5h/cm and combine the actual (real) thickness of forging to confirm; Insulation is chilled to the air cooling of coming out of the stove below 300 ℃ with workpiece with stove after finishing;
5) forging performance thermal treatment: will forge the annealed workpiece surface rough turn after; Carry out UT, remove all defect that the surface exists, carry out property heat treatment after qualified; I.e. quenching+temper; Quenching temperature is 950～970 ℃ and carries out oil cooling, and temperature rise rate is controlled to be 7～10 ℃/rnin, and the soaking time establishing criteria is 1h/cm; 700～720 ℃ of air coolings of tempering temperature, temperature rise rate is controlled to be 7～10 ℃/min, and the soaking time establishing criteria is 1.5h/cm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103740915A (en) * | 2013-10-28 | 2014-04-23 | 张家港海锅重型锻件有限公司 | Production process of 1552 alloy forge piece for wind power bearing |
| CN106048388A (en) * | 2016-07-08 | 2016-10-26 | 四川六合锻造股份有限公司 | Method for improving impact performance of 1Cr13 |
| CN111118277A (en) * | 2019-12-30 | 2020-05-08 | 张家港江苏科技大学产业技术研究院 | Method for manufacturing diaphragm half ring for steam turbine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10287960A (en) * | 1997-04-18 | 1998-10-27 | Nippon Steel Corp | High chromium ferritic steel |
| CN101525727A (en) * | 2009-04-22 | 2009-09-09 | 四川江油六合汽轮机材料有限公司 | Heat-resisting steel material used as vane or bolt of ultra-supercritical steam turbine and preparation method thereof |
| CN101525726A (en) * | 2009-04-22 | 2009-09-09 | 四川江油六合汽轮机材料有限公司 | Heat-resisting steel material used as vane or bolt of supercritical steam turbine and preparation method thereof |
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2012
- 2012-08-16 CN CN201210291017.8A patent/CN102808136B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10287960A (en) * | 1997-04-18 | 1998-10-27 | Nippon Steel Corp | High chromium ferritic steel |
| CN101525727A (en) * | 2009-04-22 | 2009-09-09 | 四川江油六合汽轮机材料有限公司 | Heat-resisting steel material used as vane or bolt of ultra-supercritical steam turbine and preparation method thereof |
| CN101525726A (en) * | 2009-04-22 | 2009-09-09 | 四川江油六合汽轮机材料有限公司 | Heat-resisting steel material used as vane or bolt of supercritical steam turbine and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103740915A (en) * | 2013-10-28 | 2014-04-23 | 张家港海锅重型锻件有限公司 | Production process of 1552 alloy forge piece for wind power bearing |
| CN106048388A (en) * | 2016-07-08 | 2016-10-26 | 四川六合锻造股份有限公司 | Method for improving impact performance of 1Cr13 |
| CN106048388B (en) * | 2016-07-08 | 2019-02-05 | 四川六合锻造股份有限公司 | A method of improving 1Cr13 impact property |
| CN111118277A (en) * | 2019-12-30 | 2020-05-08 | 张家港江苏科技大学产业技术研究院 | Method for manufacturing diaphragm half ring for steam turbine |
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Address after: 076576 Zhuolu science and Technology Park, Zhangjiakou, Hebei, China Patentee after: Hebei Wuwei aviation electrical Polytron Technologies Inc Address before: 076576 Zhuolu science and Technology Park, Zhangjiakou, Hebei, China Patentee before: Hebei Wuwei Aero & Power Technology Co.,Ltd. |
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