CN108326270A - A kind of pouring procedure of supercritical turbine valve casing steel-casting - Google Patents
A kind of pouring procedure of supercritical turbine valve casing steel-casting Download PDFInfo
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- CN108326270A CN108326270A CN201810189005.1A CN201810189005A CN108326270A CN 108326270 A CN108326270 A CN 108326270A CN 201810189005 A CN201810189005 A CN 201810189005A CN 108326270 A CN108326270 A CN 108326270A
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- casting
- steel
- ladle
- valve casing
- exclusion device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention discloses a kind of pouring procedures of supercritical turbine valve casing steel-casting, belong to machine casting field.The present invention pours into a mould protection system using the closing of air exclusion device, completely cuts off air, since molten steel and extraneous air isolation will not cause molten steel air-breathing in casting process, can effectively reduce secondary oxidation of steel, reduce field trash and generate.Present invention is especially suited for the supercritical turbine valve casing steel-castings of alloy content in molten steel, it can be ensured that supercritical turbine valve casing steel-casting secondary oxidation slag inclusion yield in casting process is greatly decreased.Both mending of iron castings amount had been reduced, satisfaction is increasingly improved to steel-casting quality requirement, and increases Foundry Works's economic benefit.
Description
Technical field
The present invention relates to a kind of pouring procedures of supercritical turbine valve casing steel-casting, belong to machine casting field.
Background technology
High-power, high parameter, high reliability, high thermal efficiency and clean environment firendly have become the development of current steam turbine technology
Direction, greatly develop low coal consumption, the ultra supercritical coal-fired unit technology of low stain be China realize energy-saving and emission-reduction strategic objective and
Ensure one of the important measures of national energy security.A core component in extra-supercritical unit is exactly pitch valve casing, at present
Such product still relies on import, therefore exploitation meets extra-supercritical unit set gate valve shell as the task of top priority.
Meanwhile with the development of social life and science and technology, people are higher and higher to steel-casting quality requirement.With regard to steamer
For machine industry, as steam turbine working efficiency steps up, performance and quality requirement to steam turbine steel-casting are increasingly
Height, much the alloy contents such as Cr, Ni, Mo of such casting step up now, and flaw detection grade is also stepping up, some casting
Locally even whole is all that 0 grade of flaw detection requires.
Traditional pouring procedure, molten steel is directly exposed easily to suck air in casting process in an atmosphere, and in air
Oxygen, which reacts, generates secondary oxidation field trash.Moreover, alloy content is higher in molten steel, it is more also easy to produce secondary oxidation field trash.
In addition, increasing when molten steel viscosity increases with alloy content, field trash is difficult to removal of floating.Tradition cast casting field trash compared with
It is serious, it is difficult to meet flaw detection quality requirement, bring a large amount of soldering to work, which results in casting costs higher, delivery date
The problems such as delay, seriously affects Foundry Works's economic benefit.
Invention content
The present invention is intended to provide a kind of pouring procedure of supercritical turbine valve casing steel-casting, the method is using sky
Protection system is poured into a mould in the closing of gas excluder, is mainly included the following steps that：
(6) air exclusion device is placed on casting mold cast gate before pouring into a mould,
(7) ladle is hung to right over air exclusion device and by sprue gate to positive casting mold cast gate,
(8) air exclusion device height adjuster and ladle height are adjusted to appropriate location, the ladle bottom mouth of a river is noted with cavity
The distance at the mouth of a river is 1.5m；
(9) it opens steel ladle pouring mouth to be poured into a mould, since molten steel and extraneous air isolation will not cause steel in casting process
Water air-breathing can effectively reduce secondary oxidation of steel, reduce field trash and generate；
(10) after being poured, the upper and lower rotating folding mechanism of air exclusion device is opened, is unclamped and ladle water filling port, casting
Contact between type cast gate hangs ladle and air exclusion device.
The air exclusion device includes the heat-insulated tank wall of cylindrical shape, and upper and lower end is mounted with rotating folding mechanism respectively, and (center is fast
Door machine structure), the holder for adjusting height is also mounted in the both sides of heat-insulated tank wall.
In one embodiment of the invention, the material of steel-casting is ZG13Cr9Mo2Co1NiVNbNB heat resisting steel.
Advantage of the present invention：
Pouring procedure provided by the invention is particularly suitable for the supercritical turbine valve casing cast steel of alloy content in molten steel
Part, it can be ensured that supercritical turbine valve casing steel-casting secondary oxidation slag inclusion yield in casting process is greatly decreased.Institute
The flaw detection grade for obtaining casting is 0 grade, and mending of iron castings amount significantly declines 0.47% from the 3% of casting net weight, can reduce 2.53%,
Every casting welding rod expense is 11186 yuan, reduces by 60214 yuan, has both reduced mending of iron castings amount, and satisfaction is increasingly improved to steel-casting matter
Amount requires, and increases Foundry Works's economic benefit.
Air exclusion device is repeatable to be utilized, and is avoided the inert gas expense brought when completely cutting off air using inert gas, is answered
Miscellaneous plant issue；Easy environmental protection saves money, is easy to operate.
The supercritical turbine valve casing steel-casting that the present invention is prepared is in 600 DEG C -620 DEG C of high temperature, high pressure 20-
There are excellent creep, the anti-oxidant and performances such as antifatigue under 25MPa loading conditions.630~650MPa of its tensile strength, elongation
Rate is more than 15%, FATT50% and is less than 9；Under high temperature, high pressure service condition, i.e., temperature is 620 DEG C, stress 150N/mm2,
Safe operation in 10000h, performance reach world-class levels.
Description of the drawings
The schematic diagram of Fig. 1 routine casting castings；
The schematic diagram of 2 casting and pouring method of Fig. 2 embodiments；
The schematic diagram of Fig. 3 air exclusion devices；
Fig. 4 rotating foldings mechanism (central shutter mechanism) schematic diagram, a：Rotating folding train openings deflated state, b：Rotation
Open-and-close mechanism opening magnifying state.
Specific implementation mode
The acceptance condition of 1 casting individual defect of table
| Flaw detection grade | NONLINEAR DEFECT maximum area (cm2) | Defective locations |
| 0 | 0 | Entire wall thickness |
| 1 | 6.5 | Entire wall thickness |
Note：NONLINEAR DEFECT maximum area is probe migration area on cast(ing) surface.
The acceptance condition of 2 casting close defect of table
Note 1：Do not consider in the i.e. intermediate wall thickness 1/3 in the position of wall thickness or outer inner wall 1/3；
Note 2：Each is more than that the Application of defect half-wave methods of 12.7mm reference lines measures its area, and wave height 6.4mm is edge,
Connection center probe line, when can not measure defect area, each is more than that the defects of 12.7mm reference lines should be by 0.97cm2Area
Defect is come add up (being the defect reflection loss coefficient that φ 6.4mm hole areas are multiplied by 3 times)；
Note 3：Cumulative intensive label area must be in dispersed distribution, and distributed areas are at least 232cm2, otherwise, should mend
Weldering is to meet credit rating requirement.
Embodiment 1
14 tons of the net weight of supercritical turbine valve casing steel-casting, spray weigh 19 tons, 38 tons of pour steel amount, casting
Material is ZG1Cr10MoWVNbN heat resisting steel (alloy content is 14% or so), and casting flaw detection class requirement is 0 grade.
Molten steel is directly flowed into casting type by routine casting casting as shown in Figure 1 from ladle via geat, running channel
Chamber, obtained casting secondary oxidation slag inclusion is more, it has also been found that exceeded slag inclusion class defect is more, digging lacks rear soldering for ultrasonic examination
Amount is big, soldering amount averaged occupation casting net weight 3%.And the welding rod used in such casting needs import, welding rod price per ton 170,000, often
Casting bare electrode expense is as high as 71400 yuan or more, time-consuming and laborious, seriously affects Foundry Works's economic benefit.
Embodiment 2
Target casting in embodiment 1 is changed to using the cast of method shown in Fig. 2：
(1) air exclusion device is placed on casting mold cast gate before pouring into a mould, ladle is hung to right over air exclusion device and will be poured
Geat is to positive casting mold cast gate；
(2) air exclusion device height adjuster and ladle height are adjusted to appropriate location, the ladle bottom mouth of a river is noted with cavity
The distance at the mouth of a river is 1.5m；
(3) openings of sizes for adjusting the upper and lower rotating folding mechanism of air exclusion device, is allowed to and ladle water filling port, casting mold
Cast gate is fitted close, completely cuts off extraneous air；
(4) it opens steel ladle pouring mouth to be poured into a mould, since molten steel and extraneous air isolation will not cause steel in casting process
Water air-breathing can effectively reduce secondary oxidation of steel, reduce field trash and generate；
(5) after being poured, the upper and lower rotating folding mechanism of air exclusion device is opened, is unclamped and ladle water filling port, casting mold
Contact between cast gate hangs ladle and air exclusion device.
(heat treatment process is+750 DEG C of tempering of 1000 DEG C of solid solutions to the casting that this method pours into a mould out, is gone after finishing repair welding
Stress annealing, microscopic structure be acicular martensite position to tempered sorbite.) slag inclusion class defect reduced, soldering amount is average
In casting net weight 0.47%, 2.53% can be reduced, every casting welding rod expense is 11186 yuan, reduces by 60214 yuan.Tensile strength
630~650MPa, elongation are more than 15%, FATT50% and are less than 9；Under high temperature, high pressure service condition, i.e., temperature is 620 DEG C,
Stress 150N/mm2, the safe operation in 10000h.
Embodiment 3
Target casting in embodiment 1 is changed to using the cast of method shown in Fig. 2：
(1) air exclusion device is placed on casting mold cast gate before pouring into a mould, ladle is hung to right over air exclusion device and will be poured
Geat is to positive casting mold cast gate；
(2) air exclusion device height adjuster and ladle height are adjusted to appropriate location, the ladle bottom mouth of a river is noted with cavity
The distance at the mouth of a river is 1.2m；
(3) openings of sizes for adjusting the upper and lower rotating folding mechanism of air exclusion device, is allowed to and ladle water filling port, casting mold
Cast gate is fitted close, completely cuts off extraneous air；
(4) it opens steel ladle pouring mouth to be poured into a mould, since molten steel and extraneous air isolation will not cause steel in casting process
Water air-breathing can effectively reduce secondary oxidation of steel, reduce field trash and generate；
(5) after being poured, the upper and lower rotating folding mechanism of air exclusion device is opened, is unclamped and ladle water filling port, casting mold
Contact between cast gate hangs ladle and air exclusion device.
The casting slag inclusion class defect that this method pours into a mould out is reduced, and soldering amount is average in casting net weight 0.53%, can subtract
Few 2.47%, every casting welding rod expense is 12614 yuan, reduces by 58786 yuan.
Embodiment 4
Target casting in embodiment 1 is changed to using the cast of method shown in Fig. 2：
(1) air exclusion device is placed on casting mold cast gate before pouring into a mould, ladle is hung to right over air exclusion device and will be poured
Geat is to positive casting mold cast gate；
(2) air exclusion device height adjuster and ladle height are adjusted to appropriate location, the ladle bottom mouth of a river is noted with cavity
The distance at the mouth of a river is 1.8m；
(3) openings of sizes for adjusting the upper and lower rotating folding mechanism of air exclusion device, is allowed to and ladle water filling port, casting mold
Cast gate is fitted close, completely cuts off extraneous air；
(4) it opens steel ladle pouring mouth to be poured into a mould, since molten steel and extraneous air isolation will not cause steel in casting process
Water air-breathing can effectively reduce secondary oxidation of steel, reduce field trash and generate；
(5) after being poured, the upper and lower rotating folding mechanism of air exclusion device is opened, is unclamped and ladle water filling port, casting mold
Contact between cast gate hangs ladle and air exclusion device.
The casting slag inclusion class defect that this method pours into a mould out is reduced, and soldering amount is average in casting net weight 0.77%, can subtract
Few 2.23%, every casting welding rod expense is 18326 yuan, reduces by 5474 yuan.
Although the present invention has been described by way of example and in terms of the preferred embodiments, it is not limited to the present invention, any to be familiar with this skill
The people of art can do various change and modification, therefore the protection model of the present invention without departing from the spirit and scope of the present invention
Enclosing be subject to what claims were defined.
Claims (5)
1. a kind of pouring procedure of supercritical turbine valve casing steel-casting, which is characterized in that mainly include the following steps that：
(1) air exclusion device is placed on casting mold cast gate before pouring into a mould,
(2) ladle is hung to right over air exclusion device and by sprue gate to positive casting mold cast gate,
(3) air exclusion device height adjuster and ladle height are adjusted to appropriate location, the ladle bottom mouth of a river and cavity water filling port
Distance be 1.5m；
(4) it opens steel ladle pouring mouth to be poured into a mould, since molten steel and extraneous air isolation will not cause molten steel to inhale in casting process
Gas can effectively reduce secondary oxidation of steel, reduce field trash and generate；
(5) after being poured, the upper and lower rotating folding mechanism of air exclusion device is opened, is unclamped and ladle water filling port, casting mold cast gate
Between contact, hang ladle and air exclusion device；
The air exclusion device includes the heat-insulated tank wall of cylindrical shape, and upper and lower end is mounted with rotating folding mechanism respectively, heat-insulated tank wall
The holder for adjusting height is also mounted in both sides.
2. a kind of pouring procedure of supercritical turbine valve casing steel-casting according to claim 1, which is characterized in that casting
The material of steel part is ZG13Cr9Mo2Co1NiVNbNB heat resisting steel.
3. the supercritical turbine valve casing steel-casting being prepared method according to claim 1 or 2.
4. the supercritical turbine containing supercritical turbine valve casing steel-casting described in claim 3.
5. application of the supercritical turbine described in claim 4 in thermal power generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810189005.1A CN108326270B (en) | 2018-03-08 | 2018-03-08 | A kind of pouring procedure of supercritical turbine valve casing steel-casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810189005.1A CN108326270B (en) | 2018-03-08 | 2018-03-08 | A kind of pouring procedure of supercritical turbine valve casing steel-casting |
Publications (2)
| Publication Number | Publication Date |
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| CN108326270A true CN108326270A (en) | 2018-07-27 |
| CN108326270B CN108326270B (en) | 2019-03-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111097901A (en) * | 2019-12-11 | 2020-05-05 | 重庆市巨力冶金制品有限公司 | Production equipment of balancing weight for automobile tire |
| CN111151715A (en) * | 2020-01-21 | 2020-05-15 | 三鑫重工机械有限公司 | Casting contact type pouring method and device thereof |
| CN111368416A (en) * | 2020-03-02 | 2020-07-03 | 三鑫重工机械有限公司 | Large-scale steel casting mold filling sensing correction method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111097901A (en) * | 2019-12-11 | 2020-05-05 | 重庆市巨力冶金制品有限公司 | Production equipment of balancing weight for automobile tire |
| CN111151715A (en) * | 2020-01-21 | 2020-05-15 | 三鑫重工机械有限公司 | Casting contact type pouring method and device thereof |
| CN111151715B (en) * | 2020-01-21 | 2020-08-28 | 三鑫重工机械有限公司 | Casting contact type pouring method and device thereof |
| CN111368416A (en) * | 2020-03-02 | 2020-07-03 | 三鑫重工机械有限公司 | Large-scale steel casting mold filling sensing correction method and system |
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| Publication number | Publication date |
|---|---|
| CN108326270B (en) | 2019-03-29 |
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