CN106435399B - A kind of pipe fitting and its application - Google Patents
A kind of pipe fitting and its application Download PDFInfo
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- CN106435399B CN106435399B CN201610920667.2A CN201610920667A CN106435399B CN 106435399 B CN106435399 B CN 106435399B CN 201610920667 A CN201610920667 A CN 201610920667A CN 106435399 B CN106435399 B CN 106435399B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The application belongs to metal field, and in particular to a kind of pipe fitting.The present invention provides a kind of pipe fittings, the pipe fitting is mainly made of a kind of new alloy material, and the novel alloy includes following components: the Cr of 17.0wt%~27.0wt%, the Al of 0~10.0wt%, the Ni of 0~2.0wt%, the Mo of 0~3.0wt%, the Ti of 0~2.0wt%, the Nb of 0~2.0wt% and the Fe of surplus.Various metallic element interactions, cooperate, so that the alloy has good resistance to K+、Na+、Cl‑Corrosive nature and high-temperature corrosion resistance performance.Biomass power plant boiler overheating pipe is used to prepare using a kind of pipe fitting made of this kind of novel alloy, K can be mitigated+、Na+、Cl‑The high temperature corrosion of plasma acts on, and extends the service life of tubing.
Description
Technical field
The invention belongs to metal fields, and in particular to a kind of pipe fitting and its application.
Background technique
Biomass power generation is the power generation carried out using biomass energy possessed by biomass, is the one of renewable energy power generation
Kind, including the direct combustion power generation of agriculture and forestry organic waste material, agriculture and forestry organic waste material gasifying electricity generation, waste incineration and generating electricity, landfill gas power generation,
Marsh gas power generation.Renewable, free of contamination biomass fuel is one of the developing direction of the following green regenerative energy sources, is had wide
Wealthy development prospect.However, biomass fuel such as stalk etc. is due to absorbing a large amount of minerals, salt etc. during the growth process,
Contain K in combustion atmosphere+、Na+、Cl-Plasma and its esters, contact with superheater tubes and are easy to happen corrosiveness, capture pipe
Oxygen in material oxide on surface protective film corrodes iron-containing low melting point chloride and sulfide in tubing, further promotes tubing
Corrosion process persistently occurs.Therefore, compared with coal fired power generation, generating power with biomass combustion is resistance to the equipment such as station boiler superheater tube
Corrosive nature is more demanding.
Common alloy material is TP91 alloy, 304 not in preparing biomass power plant boiler overheating pipe both at home and abroad at present
Become rusty steel and HR3C alloy etc..However, in high temperature and containing K+、Na+、Cl-Under the conditions of plasma and steam etc., TP91 alloy and 304
The protective effect of the oxide, carbide on stainless steel surface layer is limited, and this kind of thermoelectricity boiler superheater tubing can fouling be simultaneously quickly
It is corroded and aoxidizes, therefore service life shortens.For HR3C alloy, ingredient 25Cr-20Ni-Nb-N, although having one
The resistance to K of fixed high temperature+、Na+、Cl-Plasma etching performance, but this alloy is the alloy of austenitic structure, contains a large amount of Ni
Element, price is relatively high, and tubular object extruding acquires a certain degree of difficulty.
Therefore, a kind of high-temperature corrosion resistance, low-cost pipe fitting are developed, biomass power plant boiler overheating is used to prepare
Pipe, is those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
In view of this, being used to prepare biomass power plant pot the purpose of the present invention is to provide a kind of low-cost pipe fitting
Furnace superheater tube mitigates K+、Na+、Cl-The high temperature corrosion of plasma acts on, and extends the service life of tubing.
To achieve the above object, the specific technical solution of the present invention is as follows:
A kind of pipe fitting, the pipe fitting are mainly made of a kind of alloy；
Wherein, the alloy includes following components:
Preferably, the content of the Cr is 19.0wt%~24.0wt%.
Preferably, the content of the Al is 3.0wt%~7.5wt%.
Preferably, the content of the Ni is 0~1.5wt%.
Preferably, the content of the Mo is 0~1.5wt%.
Preferably, the content of the Ti is 0.2wt%~1.0wt%.
Preferably, the content of the Nb is 0.2wt%~1.0wt%.
Preferably, the alloy preparation method the following steps are included:
A) raw material of each ingredient is weighed；
B) Cr, Ni, Mo, Nb and Fe are placed in vaccum sensitive stove；Vacuumizing to burner hearth makes its vacuum degree be less than 50Pa, and adds
Heat makes melting sources to 1500~1600 DEG C；It deaerates after 10min, Al and Ti is added and quickly mixes, melts, obtains melt；
C) the step b) melt is cast, obtains casting；
D) alloy material is made by hot forging, hot rolling, annealing and cold rolling in casting.
Preferably, the raw material of described Cr, Al, Ni, Mo, Ti, Nb and Fe are pure metal ingot；
Or, the raw material of described Cr, Al, Ni, Mo and Ti are pure metal ingot, the raw material of the Nb and Fe are NbFe intermediate alloy
Ingot；
Or, the raw material of described Al, Ni, Ti, Nb and Fe are pure metal ingot, the raw material of the Cr is Cr master alloy, the Mo
Raw material be Mo master alloy.
Preferably, the vacuum degree of the step b) burner hearth is 12~15Pa.
Preferably, the temperature of the step d) hot forging is 1050~1200 DEG C, and the temperature of the hot rolling is 1000~1150
DEG C, the temperature of the annealing is 800~900 DEG C, and the cold rolling is cold rolling at room temperature.
Preferably, the step d) alloy material is ferritic structure；The ferritic structure crystal grain is uniform.
Preferably, the pipe fitting is biomass station boiler superheater tube.
The present invention also provides above-mentioned pipe fittings to prepare the application in boiler overheating pipe.
A kind of pipe fitting provided by the invention, it is low in cost, and there is good high temperature resistant K+、Na+、Cl-Plasma etching
Performance.This pipe fitting is mainly made of a kind of alloy, which includes: chromium, the 0~10.0wt% of 17.0~27.0wt%
Aluminium, the nickel of 0~2.0wt%, the molybdenum of 0~3.0wt%, the titanium of 0~2.0wt%, the niobium of 0~2.0wt%, surplus iron.Each gold
Belong to element interaction, cooperate, so that the alloy has good resistance to K+、Na+、Cl-Corrosive nature and high temperature corrosion
Energy.Compared with the common heat exchanger tube alloy such as Fe-26Cr-1Mo, Fe-26Cr-3Ni-3Mo and Fe-23Cr-14Ni-1Mo, the alloy
With better heating conduction, lower thermal expansion coefficient, better high temperature resistant Cl-、Na+And K+Ion corrosion resistance, and
Good processability, welding performance；Compared with the austenitic alloys such as 304, HR3C, cost is relatively low for the Alfer.
In the preparation process of alloy material of the present invention, by the control that alloy raw material is added portionwise, in hot conditions
The lower chance for reducing certain alloy raw materials and being easily oxidized guarantees that the oxygen and other impurities content in alloy finished product maintain lower water
It is flat.Later period by hot-working appropriate, cold working and annealing, guarantee the alloy of preparation have crystal grain is tiny, tissue is pure,
Uniform ferrite structure, it is ensured that the new type corrosion resistant alloy has good mechanical property.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the Metallograph of the corrosion resistant alloy material of the embodiment of the present invention 1；
The corrosion resistant alloy material and other alloys in common use materials that Fig. 2 is the embodiment of the present invention 2 are in 600 DEG C of KCl atmosphere
Corrosion dynamic curve figure；
The corrosion resistant alloy material and other alloys in common use materials that Fig. 3 is the embodiment of the present invention 2 are in 700 DEG C of KCl atmosphere
Corrosion dynamic curve figure；
The corrosion resistant alloy material and other alloys in common use materials that Fig. 4 is the embodiment of the present invention 3 are in 650 DEG C of KCl atmosphere
Stereoscan photograph after corrosion.
Specific embodiment
In terms of the miscellaneous corrosion resisting property of the present invention, using the excellent characteristic of aluminium oxide and chromium oxide corrosion resisting property, with reference to a variety of
On the basis of alloy property and ingredient, new Gao Ge is designed, containing the corrosion resistant alloy of aluminium by optimum experimental.
A kind of alloy material, comprising: the chromium of 17.0wt%~27.0wt%, the aluminium of 0~10.0wt%, 0~2.0wt%
Nickel, the molybdenum of 0~3.0wt%, the titanium of 0~2.0wt%, the niobium of 0~2.0wt% and surplus iron.
The elements such as chromium, nickel, aluminium and molybdenum would generally be added in the heat resisting steel used under hot conditions, wherein chromium be heat resisting steel most
Basic element makes tubing have high corrosion resisting property and high inoxidizability by forming fine and close oxidation film in tube surfaces
Energy.The content of chromium described herein be 17.0wt%~27.0wt%, preferably 19.0wt%~24.0wt%, more preferably
20.0wt%~22.0wt%, within this range, the high temperature corrosion-resisting performance of alloy material are optimized.When chromium content is less than
When 17.0wt%, the function and effect generated can be restricted since its component content is less, influence the corrosion resistance of material
Energy and antioxygenic property；When its content is more than 27.0wt%, alloy material plasticity will lead to, toughness sharply declines, generation timeliness
Low-alloyed service life drops in embrittlement.In addition, chromium content is excessively high, increases the Carbide Precipitation of chromium and make the corrosion resistance of steel
The risk that can decline.Therefore, the content of chromium is controlled in 17.0wt%~27.0wt%, preferably 19.0wt~24.0wt%, more
Preferably 20.0wt%~23.0wt%.
Appropriate nickel, which is added in heat resisting steel, dissolves in solid solution, the mechanical property of steel can be made to significantly improve, moreover it is possible to improve heat resisting steel
Antioxygenic property.However, nickel is more rare resource, price is higher, and with the increasing of nickel element content in alloy material
Its difficulty of processing is added also to increase.Therefore, the content of nickel is preferably controlled in 0~2.0wt%, preferably 0~1.5wt%, more preferably 0
~1wt%.
The addition of aluminium can make heat resisting steel form protective oxide film, improve the antioxygenic property and its corrosion resistance of steel
Energy.The content of aluminium is preferably 0~10.0wt%, preferably 3.0wt%~7.5wt%, more preferably 5wt%~6wt%.
Molybdenum is added in heat resisting steel as trace alloying element, makes the crystal grain refinement of steel, keeps enough intensity at high temperature
And creep resisting ability, it furthermore may also suppress the brittleness of alloy material.The content of molybdenum is unsuitable excessively high, can be 0~3.0wt%, preferably
For 0~1.5wt%, more preferably 0~1.2wt%.
Niobium and titanium are added in heat resisting steel, can form stable carbide, improve the intensity and thermohardening of steel, ensure that the conjunction
Superperformance of the gold in terms of the burn into of resistance to Cl K corrosion and high temperature corrosion property.Therefore, the content of niobium is 0~2.0wt%, preferably
For 0.2wt%~1.0wt%, more preferably 0.4wt%~0.6wt%；The content of titanium is 0~2.0wt%, preferably
0.2wt%~1.0wt%, more preferably 0.4wt%~0.6wt%.
The source of above-mentioned each element ingredient is mainly the pure metal ingot of Cr, Al, Ni, Mo, Ti, Nb, Fe, in addition to pure metal
The source of ingot, Nb, Fe can also close ingot for the intermediate of NbFe, and the source of Cr, Mo can also be its master alloy.Above-described original
Material inevitably is also impossible to completely remove these yuan in smelting process containing other elements, alloys such as C, P, S, Mn, N
Element, their presence influence the performance of alloy there is also certain.In alloy material provided by the invention, these elements contain
Amount are as follows: C < 0.10wt%, P < 0.045wt%, S < 0.03wt%, Mn < 2.0wt%, N < 0.01wt%；Also are as follows: C+N <
0.02wt%, P < 0.02wt%, S < 0.02wt%, Mn < 0.5wt% meet national examination criteria.
The present invention also provides the preparation methods of above-mentioned alloy material, comprising: weighs stock, melting, casting and forging.?
In fusion process, by being connected with molecular pump, vacuum degree is effectively controlled in furnace in 12~15Pa or 50Pa hereinafter, guaranteeing furnace
Interior partial pressure of oxygen is small, and chemical activity is low, so that the gas-solid of oxygen and other unfavorable active gases and alloy raw material is anti-in fusion process
It should be inhibited.By the control that alloy raw material is added portionwise, certain alloy raw materials are reduced under the high temperature conditions and are easily oxidized
Chance, guarantee alloy finished product in oxygen or other impurities content it is low.Later period by hot-working appropriate, cold working and annealing at
Reason guarantees that the alloy of preparation is tiny with crystal grain, organizes pure, uniform ferrite structure, it is ensured that the new type corrosion resistant closes
Fitting has good mechanical property.
Technical solution of the present invention is clearly and completely described below in conjunction with description of the invention attached drawing, it is clear that
Described embodiment is a part of the embodiment of the present invention, instead of all the embodiments.Those skilled in the art should manage
Solution, modifies to specific embodiments of the present invention or is replaced on an equal basis to some technical characteristics, without departing from the present invention
The spirit of technical solution should all cover in the scope of protection of the invention.
Embodiment 1
It is pure to weigh 429g pure iron ingot, 120g pure chromium ingot, 36g fine aluminium ingot, 6g pure nickel ingot, the pure molybdenum ingot of 3g and the pure titanium ingot of 3g, 3g
Niobium ingot and 0.12g graphite, stock.
Above-mentioned Fe, Cr, Ni, Mo, Nb and graphite raw material are mixed roughly, vacuum induction melting region, Al and Ti are placed in
Ingot is previously positioned at vaccum sensitive stove top.Molecular pump is opened to entire induction stove evacuation, when burner hearth vacuum degree drops to 15Pa
Left and right, fire box temperature are warming up to 1500 DEG C or more.Smelting area melting sources and after deaerating 10 minutes in furnace, then by Al and Ti
Ingot merging, quick hybrid alloys simultaneously melt.After all alloy raw materials all melt as melt, pours into high-temperature resistance die and cast.
Casting is hot-forged at 1100 DEG C, the cold rolling at room temperature after 1050 DEG C of hot rollings, 850 DEG C of annealing.By wire cutting, clean,
It is prepared into for simulating 550~700 DEG C of KCl atmosphere corrosion experiments of biomass power plant lacing film used.Fig. 1 is the embodiment of the present invention
The Metallograph of alloy material Fe-20Cr-6Al-1Ni-0.5Mo-0.5Ti-0.5Nb-0.02C, as shown in Fig. 1 result,
The alloy material is single ferritic structure, and uniform small grains, tissue is purer, has good mechanical property.
Embodiment 2
438g pure iron ingot, 126g pure chromium ingot, 30g fine aluminium ingot, the pure titanium ingot of 2.4g, the pure niobium ingot of 3.7g and 0.12g graphite are weighed,
Stock.
Above-mentioned Fe, Cr, Nb and graphite raw material are mixed roughly, vacuum induction melting region is placed in, Al and Ti ingot is preparatory
It is placed on vaccum sensitive stove top.Molecular pump is opened to entire induction stove evacuation, when burner hearth vacuum degree drops to 12Pa or so, furnace
Bore temperature is warming up to 1550 DEG C, and smelting area raw material starts to melt.Out of furnace smelting area melting sources and deaerate 10 minutes with
Afterwards, Al and Ti ingot is placed in, quickly mixes and melts Al and Ti.After all alloy raw materials all melt as melt, resistance to height is poured into
It casts in warm mold.
Casting is hot-forged at 1100 DEG C, the cold rolling at room temperature after 1050 DEG C of hot rollings, 850 DEG C of annealing.By wire cutting, clean,
It is prepared into for simulating 550~700 DEG C of KCl atmosphere corrosion experiments of biomass power plant lacing film used.Fig. 2 and Fig. 3 is respectively this
Corrosion power of the inventive embodiments alloy Fe-21Cr-5Al-0.4Ti-0.4Nb-0.02C in 600 DEG C and 700 DEG C of KCl atmosphere
Learn curve.As shown in the result of Fig. 2 and Fig. 3, compared with other resistant materials, alloy of the embodiment of the present invention is resistance at 600 DEG C
KCl surrosion characteristic is less than the 1/6 of other corrosion resistant alloys；Moreover, corrosion resisting property is more obvious under 700 DEG C of hot conditions,
Illustrate that the alloy has outstanding resistance to KCl corrosive nature, there is the good prospect used for biomass power plant boiler.
Embodiment 3
Weigh 466g pure iron ingot, 143g pure chromium ingot, 32.5g fine aluminium ingot, 3.3g pure nickel ingot, the pure titanium ingot of 2.6g, the pure niobium of 2.8g
Ingot and 0.07g graphite, stock.
Above-mentioned Fe, Cr, Ni, Nb and graphite raw material are mixed roughly, vacuum induction melting region is placed in, Al and Ti ingot is pre-
First it is placed on vaccum sensitive stove top.Molecular pump is opened to entire induction stove evacuation, when burner hearth vacuum degree drops to 15Pa or so,
Fire box temperature is warming up to 1550 DEG C, and smelting area raw material starts to melt.Out of furnace smelting area melting sources and deaerate 10 minutes
After, Al and Ti ingot is placed in, quickly mixes and melts Al and Ti.After all alloy raw materials all melt as melt, pour into resistance to
It casts in die material.
Casting is hot-forged at 1050 DEG C, the cold rolling at room temperature after 1000 DEG C of hot rollings, 850 DEG C of annealing.By wire cutting, clean,
It is prepared into for simulating 550~700 DEG C of KCl atmosphere corrosion experiments of biomass power plant lacing film used.Fig. 4 is the embodiment of the present invention
Alloy Fe-22Cr-5Al-0.5Ni-0.4Ti-0.4Nb-0.01C is in 650 DEG C of microcosmic scanning electron microscope after KCl steam corrosion
Photo, wherein a is Fe-26Cr-1Mo alloy, and b is the embodiment alloy, and c is Fe-26Cr-3Ni-3Mo alloy, d Fe-
23Cr-14Ni-1Mo alloy.As shown in Fig. 4 result, the surface of common corrosion resisting alloy generates a large amount of sparse in the prior art
The corrosion product of porous, blade shapes and layer by layer cluster, however corrosion resistant alloy of the invention still has metallic luster, only in table
Face generates a small amount of equally distributed fine oxide, or even can also be observed that alloy substrate feature, effectively demonstrates the present invention
Alloy may be advantageously employed in the Boiler Pipe of biomass power plant.
Claims (11)
1. a kind of pipe fitting, which is characterized in that the pipe fitting is mainly made of a kind of alloy；
Wherein, the alloy includes following components:
Fe is surplus；
The preparation method of the alloy the following steps are included:
A) raw material of each ingredient is weighed；
B) Cr, Ni, Mo, Nb and Fe are placed in vaccum sensitive stove；Vacuumizing to burner hearth makes its vacuum degree be less than 50Pa, and is heated to
1500~1600 DEG C, make melting sources；It deaerates after 10min, Al and Ti is added and quickly mixes, melts, obtains melt；
C) the step b) melt is cast, obtains casting；
D) alloy material is made by hot forging, hot rolling, annealing and cold rolling in casting；
Wherein, the temperature of the step d) hot forging is 1050~1200 DEG C, and the temperature of the hot rolling is 1000~1150 DEG C, described
The temperature of annealing is 800~900 DEG C, and the cold rolling is cold rolling at room temperature；The alloy material is ferritic structure；The ferrite
Organize crystal grain uniform.
2. pipe fitting according to claim 1, which is characterized in that the content of the Cr is 19.0wt%~24.0wt%.
3. pipe fitting according to claim 1, which is characterized in that the content of the Al is 3.0wt%~7.5wt%.
4. pipe fitting according to claim 1, which is characterized in that the content of the Ni is to be less than or equal to 1.5wt% greater than 0.
5. pipe fitting according to claim 1, which is characterized in that the content of the Mo is to be less than or equal to 1.5wt% greater than 0.
6. pipe fitting according to claim 1, which is characterized in that the content of the Ti is 0.2wt%~1.0wt%.
7. pipe fitting according to claim 1, which is characterized in that the content of the Nb is 0.2wt%~1.0wt%.
8. pipe fitting according to claim 1, which is characterized in that the raw material of described Cr, Al, Ni, Mo, Ti, Nb and Fe are pure
Ingot；
Or, the raw material of described Cr, Al, Ni, Mo and Ti are pure metal ingot, the raw material of the Nb and Fe are NbFe intermediate alloy ingot；
Or, the raw material of described Al, Ni, Ti, Nb and Fe are pure metal ingot, the raw material of the Cr is Cr master alloy, the original of the Mo
Material is Mo master alloy.
9. pipe fitting according to claim 1, which is characterized in that the vacuum degree of the step b) burner hearth is 12~15Pa.
10. pipe fitting described in -7 any one according to claim 1, which is characterized in that the pipe fitting is biomass station boiler
Superheater tube.
11. the pipe fitting as described in claim 1-7 any one is preparing the application in boiler overheating pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610920667.2A CN106435399B (en) | 2016-10-21 | 2016-10-21 | A kind of pipe fitting and its application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610920667.2A CN106435399B (en) | 2016-10-21 | 2016-10-21 | A kind of pipe fitting and its application |
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| CN106435399B true CN106435399B (en) | 2019-05-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4935266A (en) * | 1987-07-08 | 1990-06-19 | Castolin, S.A. | Process and material for producing corrosion-resistant layers |
| US6296953B1 (en) * | 1997-08-12 | 2001-10-02 | Sandvik Ab | Steel alloy for compound tubes |
| EP1445342A1 (en) * | 2003-01-29 | 2004-08-11 | Sumitomo Metal Industries, Ltd. | Austenitic stainless steel and manufacturing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0813099A (en) * | 1994-06-27 | 1996-01-16 | Sumitomo Metal Ind Ltd | Corrosion resistant alloy for coal gasification plant superheater |
-
2016
- 2016-10-21 CN CN201610920667.2A patent/CN106435399B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4935266A (en) * | 1987-07-08 | 1990-06-19 | Castolin, S.A. | Process and material for producing corrosion-resistant layers |
| US6296953B1 (en) * | 1997-08-12 | 2001-10-02 | Sandvik Ab | Steel alloy for compound tubes |
| EP1445342A1 (en) * | 2003-01-29 | 2004-08-11 | Sumitomo Metal Industries, Ltd. | Austenitic stainless steel and manufacturing method thereof |
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| Publication number | Publication date |
|---|---|
| CN106435399A (en) | 2017-02-22 |
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