CN105423274B - The wear-resisting low-temperature coal economizer tube bundle and preparation method of a kind of ferrous alloy - Google Patents
The wear-resisting low-temperature coal economizer tube bundle and preparation method of a kind of ferrous alloy Download PDFInfo
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- CN105423274B CN105423274B CN201510792811.4A CN201510792811A CN105423274B CN 105423274 B CN105423274 B CN 105423274B CN 201510792811 A CN201510792811 A CN 201510792811A CN 105423274 B CN105423274 B CN 105423274B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The invention discloses a kind of wear-resisting low-temperature coal economizer tube bundle of ferrous alloy, wear-resisting low-temperature coal economizer tube bundle is made up of straight sections and U pipe portions, and straight sections and U pipe portions weld to form low-temperature coal economizer tube bundle, with and preparation method thereof.The wear-resisting low-temperature coal economizer tube bundle anti-wear performance of the present invention is excellent, service life is longer, corrosion resistance and excellent heat transfer property ensure that the safe and reliable of equipment operation, fume afterheat is set to be fully used, increase coal-fired utilization ratio, the discharge of pollutant is reduced, popularization and application have good economic benefit.
Description
Technical field
The present invention relates to low-level (stack-gas) economizer field, more particularly, to low-level (stack-gas) economizer selection and preparation method.
Background technology
As the improvement of people's living standards, the demand to electric power is also increasing, therefore many power plants generating electricity equipment
Constantly improving.Because the increase-volume of generating set is reconstructed, the exhaust gas temperature of many power plant can all be raised, and deviate original set
Evaluation, rise temperature reaches 20~500 degree, and the cycle efficieny that so not only have impact on boiler efficiency and power plant also add combustion
Coal usage amount.In order to solve the problem of flue-gas temperature is raised, many power plant set economizer in flue, using economizer by cigarette
Gas cools, but traditional economizer occurs seriously corroded in use, the problem of service life is short, and traditional
Economizer also haves the shortcomings that low heat exchange efficiency, the easy fouling of heat-exchanging tube bundle, equipment manufacturing cost and maintenance cost are high.
Other existing low-level (stack-gas) economizer is limited by material itself, easily occurs wearing and tearing and/or corroding in use,
Cause equipment to be used along bad, add operation and maintenance cost, even if people come up with many methods, such as saved in low temperature
Increase false tube before coal device pipe row's heating surface, but because material problem itself, drawbacks described above still have, cannot solve.
The content of the invention
Problem to be solved by this invention is, for above-mentioned shortcoming of the prior art, proposes innovation scheme, especially one
Planting fundamentally can effectively solve the scheme of abrasion and etching problem.
To solve the above problems, the scheme that the present invention is used is as follows：A kind of wear-resisting low-temperature coal economizer tube bundle of ferrous alloy
Preparation method, it is characterised in that wear-resisting low-temperature coal economizer tube bundle is made up of straight sections and U pipe portions, straight sections and U pipe portions welding shape
Into low-temperature coal economizer tube bundle, the preparation of straight sections comprises the following steps：
1. first in intermediate frequency furnace melting straight sections high ferrochrome based alloy liquation, high ferrochrome based alloy liquation include matter
Measure fraction 20-25% high carbon ferro-chrome, 5-5.5% nitrided ferro-chromium, 2-2.5% Commercial multicrystallines silicon, 1.2-1.8% cathode coppers, 3-4%
Metallic cobalt, 1.1-2% metallic nickels, 0.1-0.5% crome metals, 0.2-0.5% molybdenum-irons, 2-4.1% metallic aluminiums, 0.1-0.2% ferro-borons,
The iron of the industrial ferro-niobium of 0.1-1.4% silico-calciums barium aluminium alloy, 1.1-1.5% and surplus, in high ferrochrome based alloy fusion process,
First iron, high carbon ferro-chrome, nitrided ferro-chromium and Commercial multicrystalline silicon Hybrid Heating are melted, mid-frequency melting furnace initial power is kept
20-40kW, when temperature reaches 300-380 degrees Celsius, power ascension is to 80-100 kW, when intermediate frequency furnace bottom alloy raw material
When temperature reaches 1100-1535 degrees Celsius, alloy raw material starts fusing, now adds cathode copper, metallic cobalt and metallic nickel, and will
Intermediate frequency furnace power ascension keeps power not to 140-160 kW when temperature reaches 1500 degrees Celsius in intermediate frequency furnace
Become, crome metal, molybdenum-iron, metallic aluminium, ferro-boron, silico-calcium barium aluminium alloy and industrial ferro-niobium are added after 1-2 minutes, when alloy raw material is whole
Stop heating after fusing, steelmaking slag agent is covered on alloy molten solution anti-oxidation and removed the gred, after being kept for 5-10 minutes, will make
Slag agent is removed clean；
2. the alloy solution after step 1. melting is turned forward 15-20 °, and adjusts mid-frequency melting furnace power to 30-
40kW, is kept for 1-2 minutes, power is risen into 100-120kW rapidly, alloy molten solution is rolled in smelting furnace, is kept for 3-5 minutes
Power is down to 30-40kW again afterwards, the step is repeated 3-5 times, alloy molten solution casting is come out of the stove, and alloy pig is made；
3. by step, 2. gained alloy pig crushes and adds oxidant, is 1 by carbon containing and oxidant mol ratio：1 adds
Enter, be then crushed to 100-150 mesh, oxidation furnace oxygen blast is put into after mixing and aoxidizes and is heated to 200-900 DEG C, reaction
The blue carbon drop of the small time-varying of 2-8, generates carbon drop alloyed powder；
4. martensite steel pipe embryo will be cast into after remelting in step 3. gained alloyed powder addition intermediate frequency furnace；
5. martensite steel pipe embryo is made annealing treatment, acid is carried out to martensite steel pipe embryo with pickle after annealing
Wash, then phosphatization, saponification and lubricated successively, the martensite steel pipe embryo after lubricated is carried out cold rolling, obtain straight tube
Portion's finished product.
Further, according to above-mentioned design ferrous alloy wear-resisting low-temperature coal economizer tube bundle preparation method, it is described
1. annealing comprises the following steps is put into martensite steel pipe embryo in stove, and temperature rises to 740-750 degrees Celsius, is incubated 1-
1.5 hour；2. in-furnace temperature is risen to 770-800 degrees Celsius, handled 3.5-4 hours；3. in-furnace temperature is down into 700-730 to take the photograph
Family name's degree, is handled 1-2 hours；4. in-furnace temperature is down to 600-650 degrees Celsius, is incubated 1-2 hours；5. by martensite steel pipe embryo
Come out of the stove, be cooled to room temperature.
Further, according to above-mentioned design ferrous alloy wear-resisting low-temperature coal economizer tube bundle preparation method, it is described
The chemical constituent and mass fraction of high carbon ferro-chrome are 60-65%Cr, 7-8%C, 2-3%Si, P≤0.04%, S≤0.04%, surplus Fe.
Further, according to above-mentioned design ferrous alloy wear-resisting low-temperature coal economizer tube bundle preparation method, it is described
The chemical constituent and mass fraction of nitrided ferro-chromium be 55-60%Cr, 5.5-6%N, C≤0.1%, Si≤2.5%, P≤0.03%, S≤
0.04%, surplus Fe.
Further, according to above-mentioned design ferrous alloy wear-resisting low-temperature coal economizer tube bundle preparation method, it is described
Pickling temperature is 55-60 degrees Celsius, and pickling time is 10-30 minutes.
Further, according to above-mentioned design ferrous alloy wear-resisting low-temperature coal economizer tube bundle preparation method, it is described
Pickle is potassium bichromate, dilute sulfuric acid and sodium chloride mixed solution.
Further, according to above-mentioned design ferrous alloy wear-resisting low-temperature coal economizer tube bundle preparation method, it is described
Phosphatization temperature is 60-65 degrees Celsius, and phosphating time is 10-20 minutes.
Further, according to above-mentioned design ferrous alloy wear-resisting low-temperature coal economizer tube bundle preparation method, it is described
Cooling means is the Slow cooling in asbestos incubator.
Further, the wear-resisting low-temperature coal economizer tube bundle that the either method according to above-mentioned design is prepared.
Further, the wear-resisting low-temperature coal economizer tube bundle that the either method according to above-mentioned design is prepared, it is described
Low-temperature coal economizer tube bundle is welded with H type fins, and the chemical constituent of the H types fin is identical with the straight sections of low-level (stack-gas) economizer.
The technique effect of the present invention is as follows：
1）The wear-resisting low-temperature coal economizer tube bundle of the present invention has pipe surface hardness high（78-82HS）Uniformity of hardness is good, pipe face
Difference of hardness is less than 1.2HS, and H type fins hardness height.
2）The wear-resisting low-temperature coal economizer tube bundle of the present invention has excellent wearability, and service life is longer, is existing low
3-4 times of warm economizer hand.
3）The wear-resisting low-temperature coal economizer tube bundle of the present invention has superpower decay resistance, it is ensured that it is in complicated flue gas
It can also be used for a long time under environment, its service life is 3-4 times of existing low-temperature coal economizer tube bundle.
4）Carbon drop program is added in method designed by the present invention so that the abrasion-resistance of straight sections is greatly carried
Rise.
5）Material therefor of the present invention is generally the raw material of industry, and wide material sources are with low cost, with the great market space and competing
Strive power.
Embodiment
Embodiment 1：A kind of wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy, the wear-resisting low-temperature coal economizer tube
Row is made up of straight sections and U pipe portions, and straight sections and U pipe portions weld to form low-temperature coal economizer tube bundle, the preparations of straight sections include with
Lower step：1. first in intermediate frequency furnace melting straight sections high ferrochrome based alloy liquation, high ferrochrome based alloy liquation include matter
Measure fraction 20-25% high carbon ferro-chrome, 5-5.5% nitrided ferro-chromium, 2-2.5% Commercial multicrystallines silicon, 1.2-1.8% cathode coppers, 3-4%
Metallic cobalt, 1.1-2% metallic nickels, 0.1-0.5% crome metals, 0.2-0.5% molybdenum-irons, 2-4.1% metallic aluminiums, 0.1-0.2% ferro-borons,
The iron of the industrial ferro-niobium of 0.1-1.4% silico-calciums barium aluminium alloy, 1.1-1.5% and surplus, in high ferrochrome based alloy fusion process,
First iron, high carbon ferro-chrome, nitrided ferro-chromium and Commercial multicrystalline silicon Hybrid Heating are melted, mid-frequency melting furnace initial power is kept
20-40kW, when temperature reaches 300-380 degrees Celsius, power ascension is to 80-100 kW, when intermediate frequency furnace bottom alloy raw material
When temperature reaches 1100-1535 degrees Celsius, alloy raw material starts fusing, now adds cathode copper, metallic cobalt and metallic nickel, and will
Intermediate frequency furnace power ascension keeps power not to 140-160 kW when temperature reaches 1500 degrees Celsius in intermediate frequency furnace
Become, crome metal, molybdenum-iron, metallic aluminium, ferro-boron, silico-calcium barium aluminium alloy and industrial ferro-niobium are added after 1-2 minutes, when alloy raw material is whole
Stop heating after fusing, steelmaking slag agent is covered on alloy molten solution anti-oxidation and removed the gred, after being kept for 5-10 minutes, will make
Slag agent is removed clean；2. the alloy solution after step 1. melting is turned forward 15-20 °, and adjust mid-frequency melting furnace power to
30-40kW, is kept for 1-2 minutes, power is risen into 100-120kW rapidly, alloy molten solution is rolled in smelting furnace, keeps 3-5
Power is down to 30-40kW again after minute, the step is repeated 3-5 times, alloy molten solution casting is come out of the stove, and alloy pig is made；3. will step
Suddenly 2. gained alloy pig crushes and adds oxidant, is 1 by carbon containing and oxidant mol ratio：1 adds, and is then crushed to
100-150 mesh, puts into oxidation furnace oxygen blast and aoxidizes and be heated to 200-900 DEG C, the small time-varying indigo plant drops of reaction 2-8 after mixing
Carbon, generates carbon drop alloyed powder；4. martensite steel will be cast into after remelting in step 3. gained alloyed powder addition intermediate frequency furnace
Pipe pipe embryo；5. martensite steel pipe embryo is made annealing treatment, pickling is carried out to martensite steel pipe embryo with pickle after annealing,
Then phosphatization, saponification and lubricated successively, the martensite steel pipe embryo after lubricated is carried out it is cold rolling, obtain straight sections into
Product.
Embodiment 2：A kind of wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy, the wear-resisting low-temperature coal economizer tube
Row is made up of straight sections and U pipe portions, and straight sections and U pipe portions weld to form low-temperature coal economizer tube bundle, the preparations of straight sections include with
Lower step：1. first in intermediate frequency furnace melting straight sections high ferrochrome based alloy liquation, high ferrochrome based alloy liquation include matter
Measure fraction 20-25% high carbon ferro-chrome, 5-5.5% nitrided ferro-chromium, 2-2.5% Commercial multicrystallines silicon, 1.2-1.8% cathode coppers, 3-4%
Metallic cobalt, 1.1-2% metallic nickels, 0.1-0.5% crome metals, 0.2-0.5% molybdenum-irons, 2-4.1% metallic aluminiums, 0.1-0.2% ferro-borons,
The iron of the industrial ferro-niobium of 0.1-1.4% silico-calciums barium aluminium alloy, 1.1-1.5% and surplus, in high ferrochrome based alloy fusion process,
First iron, high carbon ferro-chrome, nitrided ferro-chromium and Commercial multicrystalline silicon Hybrid Heating are melted, mid-frequency melting furnace initial power is kept
20-40kW, when temperature reaches 300-380 degrees Celsius, power ascension is to 80-100 kW, when intermediate frequency furnace bottom alloy raw material
When temperature reaches 1100-1535 degrees Celsius, alloy raw material starts fusing, now adds cathode copper, metallic cobalt and metallic nickel, and will
Intermediate frequency furnace power ascension keeps power not to 140-160 kW when temperature reaches 1500 degrees Celsius in intermediate frequency furnace
Become, crome metal, molybdenum-iron, metallic aluminium, ferro-boron, silico-calcium barium aluminium alloy and industrial ferro-niobium are added after 1-2 minutes, when alloy raw material is whole
Stop heating after fusing, steelmaking slag agent is covered on alloy molten solution anti-oxidation and removed the gred, after being kept for 5-10 minutes, will make
Slag agent is removed clean；2. the alloy solution after step 1. melting is turned forward 15-20 °, and adjust mid-frequency melting furnace power to
30-40kW, is kept for 1-2 minutes, power is risen into 100-120kW rapidly, alloy molten solution is rolled in smelting furnace, keeps 3-5
Power is down to 30-40kW again after minute, the step is repeated 3-5 times, alloy molten solution casting is come out of the stove, and alloy pig is made；3. will step
Suddenly 2. gained alloy pig crushes and adds oxidant, is 1 by carbon containing and oxidant mol ratio：1 adds, and is then crushed to
100-150 mesh, puts into oxidation furnace oxygen blast and aoxidizes and be heated to 200-900 DEG C, the small time-varying indigo plant drops of reaction 2-8 after mixing
Carbon, generates carbon drop alloyed powder；4. martensite steel will be cast into after remelting in step 3. gained alloyed powder addition intermediate frequency furnace
Pipe pipe embryo；5. martensite steel pipe embryo is made annealing treatment, pickling is carried out to martensite steel pipe embryo with pickle after annealing,
Then phosphatization, saponification and lubricated successively, the martensite steel pipe embryo after lubricated is carried out it is cold rolling, obtain straight sections into
Product, 1. the annealing comprises the following steps is put into martensite steel pipe embryo in stove, and temperature rises to 740-750 degrees Celsius,
Insulation 1-1.5 hours；2. in-furnace temperature is risen to 770-800 degrees Celsius, handled 3.5-4 hours；3. in-furnace temperature is down to
700-730 degrees Celsius, handle 1-2 hours；4. in-furnace temperature is down to 600-650 degrees Celsius, is incubated 1-2 hours；5. by geneva
Body steel pipe embryo is come out of the stove, and is cooled to room temperature.The chemical constituent and mass fraction of the high carbon ferro-chrome are 60-65%Cr, 7-8%C, 2-
3%Si, P≤0.04%, S≤0.04%, surplus Fe.The chemical constituent and mass fraction of the nitrided ferro-chromium are 55-60%Cr, 5.5-
6%N, C≤0.1%, Si≤2.5%, P≤0.03%, S≤0.04%, surplus Fe.
Claims (10)
1. a kind of wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy, it is characterised in that wear-resisting low-temperature coal economizer tube bundle
It is made up of straight sections and U pipe portions, straight sections and U pipe portions weld to form low-temperature coal economizer tube bundle, the preparation of straight sections is including following
Step：
①：The high ferrochrome based alloy liquation of the first melting straight sections in intermediate frequency furnace, high ferrochrome based alloy liquation includes quality
Fraction 20-25% high carbon ferro-chrome, 5-5.5% nitrided ferro-chromium, 2-2.5% Commercial multicrystallines silicon, 1.2-1.8% cathode coppers, 3-
4% metallic cobalt, 1.1-2% metallic nickels, 0.1-0.5% crome metals, 0.2-0.5% molybdenum-irons, 2-4.1% metallic aluminiums, 0.1-0.2%
The iron of the industrial ferro-niobium of ferro-boron, 0.1-1.4% silico-calciums barium aluminium alloy, 1.1-1.5% and surplus, in high ferrochrome based alloy melting
During, first iron, high carbon ferro-chrome, nitrided ferro-chromium and Commercial multicrystalline silicon Hybrid Heating are melted, keep mid-frequency melting furnace to rise
Beginning power 20-40kW, when temperature reaches 300-380 degrees Celsius, power ascension is to 80-100kW, when intermediate frequency furnace bottom is closed
When golden material temperature reaches 1100-1535 degrees Celsius, alloy raw material starts fusing, now adds cathode copper, metallic cobalt and metal
Nickel, and by intermediate frequency furnace power ascension to 140-160kW, work(is kept when temperature reaches 1500 degrees Celsius in intermediate frequency furnace
Rate is constant, and crome metal, molybdenum-iron, metallic aluminium, ferro-boron, silico-calcium barium aluminium alloy and industrial ferro-niobium are added after 1-2 minutes, works as alloy raw material
All stop heating after fusing, steelmaking slag agent is covered on alloy molten solution anti-oxidation and removed the gred, after being kept for 5-10 minutes,
Slag former is removed clean；
②：Alloy solution after step 1. melting is turned forward 15-20 °, and adjusts mid-frequency melting furnace power to 30-40kW,
Kept for 1-2 minutes, power is risen into 100-120kW rapidly, alloy molten solution is rolled in smelting furnace, after being kept for 3-5 minutes again
Power is down to 30-40kW, the step is repeated 3-5 times, alloy molten solution casting is come out of the stove, and alloy pig is made；
③：By step, 2. gained alloy pig crushes and adds oxidant, is 1 by carbon containing and oxidant mol ratio：1 adds, then
100-150 mesh is crushed to, oxidation furnace oxygen blast is put into after mixing and aoxidizes and is heated to 200-900 DEG C, the small time-varying indigo plants of reaction 2-8
Carbon drop, generates carbon drop alloyed powder；
④：In step 3. gained alloyed powder addition intermediate frequency furnace martensite steel pipe embryo will be cast into after remelting；
⑤：Martensite steel pipe embryo is made annealing treatment, pickling is carried out to martensite steel pipe embryo with pickle after annealing, so
Phosphatization, saponification and lubricated successively afterwards, the martensite steel pipe embryo after lubricated is carried out it is cold rolling, obtain straight sections into
Product.
2. the wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy according to claim 1, it is characterised in that described to move back
1. fire processing comprises the following steps is put into martensite steel pipe embryo in stove, and temperature rises to 740-750 degrees Celsius, is incubated 1-1.5
Hour；2. in-furnace temperature is risen to 770-800 degrees Celsius, handled 3.5-4 hours；3. in-furnace temperature is down to 700-730 Celsius
Degree, is handled 1-2 hours；4. in-furnace temperature is down to 600-650 degrees Celsius, is incubated 1-2 hours；5. martensite steel pipe embryo is gone out
Stove, is cooled to room temperature.
3. the wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy according to claim 1, it is characterised in that the height
The chemical constituent and mass fraction of carbon ferrochrome are 60-65%Cr, 7-8%C, 2-3%Si, P≤0.04%, S≤0.04%, surplus
Fe。
4. the wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy according to claim 1, it is characterised in that the nitrogen
The chemical constituent and mass fraction for changing ferrochrome are 55-60%Cr, 5.5-6%N, C≤0.1%, Si≤2.5%, P≤0.03%, S
≤ 0.04%, surplus Fe.
5. the wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy according to claim 1, it is characterised in that the acid
It is 55-60 degrees Celsius to wash temperature, and pickling time is 10-30 minutes.
6. the wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy according to claim 1, it is characterised in that the acid
Washing lotion is potassium bichromate, dilute sulfuric acid and sodium chloride mixed solution.
7. the wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy according to claim 1, it is characterised in that the phosphorus
It is 60-65 degrees Celsius to change temperature, and phosphating time is 10-20 minutes.
8. the wear-resisting low-temperature coal economizer tube bundle preparation method of ferrous alloy according to claim 2, it is characterised in that described cold
But method is the Slow cooling in asbestos incubator.
9. the wear-resisting low-temperature coal economizer tube bundle that the either method according to claim 1-8 is prepared.
10. low-temperature coal economizer tube bundle according to claim 9, it is characterised in that the low-temperature coal economizer tube bundle is welded with H types
Fin, the chemical constituent of the H types fin is identical with the straight sections of low-level (stack-gas) economizer.
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| CN201510792811.4A CN105423274B (en) | 2015-11-18 | 2015-11-18 | The wear-resisting low-temperature coal economizer tube bundle and preparation method of a kind of ferrous alloy |
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| CN101979695B (en) * | 2010-11-17 | 2012-07-25 | 昆明理工大学 | Chromium-free high boron iron-based casting alloy and preparation method |
| CN102251183B (en) * | 2011-07-12 | 2012-10-24 | 北京工业大学 | Boron-containing high-chromium wear-resistant alloy and preparation method thereof |
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Denomination of invention: The invention relates to a wear-resistant low-temperature economizer tube bank of iron-based alloy and a preparation method thereof Effective date of registration: 20211124 Granted publication date: 20171003 Pledgee: Bank of Suzhou Co.,Ltd. Yancheng branch Pledgor: JIANGSU ZDEE ENVIRONMENTAL ENGINEERING Co.,Ltd. Registration number: Y2021320010500 |