CN103276282B - Fabrication method of anti-corrosive and wear-resistant pipeline for delivering minerals - Google Patents
Fabrication method of anti-corrosive and wear-resistant pipeline for delivering minerals Download PDFInfo
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- CN103276282B CN103276282B CN201310267567.0A CN201310267567A CN103276282B CN 103276282 B CN103276282 B CN 103276282B CN 201310267567 A CN201310267567 A CN 201310267567A CN 103276282 B CN103276282 B CN 103276282B
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Abstract
The invention relates to a fabrication method of an anti-corrosive and wear-resistant pipeline for delivering minerals. The method comprises the steps that a wear-resistant pipeline body is fabricated by centrifugal casting; quenching, high temperature tempering, solid solution strengthening heat treatment and a double tempering dispersion hardening heat treatment technology are performed; an outer wall of the pipeline is coated with a water glass nano composite coating subjected to test configuration; high temperature solidifying and then cooling are performed; a high-temperature-resistant, oxidized and anti-corrosive filming inner layer is obtained; and finally an inner wall of the pipeline is coated with a wear-resistant coating. The fabricated metal pipeline has higher hardness and wear-resistant property; the anti-corrosive outer coating of the pipeline has excellent water resistance, anti-fouling effect and high-temperature-resistant property; and the anti-corrosive inner coating of the pipeline has excellent wear-resistant property.
Description
Technical field
The present invention relates to a kind of preparation method of pipeline, particularly relate to a kind of preparation method of anticorrosion antiwear pipeline of conveying mineral.
Background technology
Material damage has three kinds of principal modes: namely rupture, corrode and wear and tear.Although fret wear, unlike other two kinds of forms, seldom causes the catastrophic harm of metal works, its financial loss caused is quite surprising.Data shows according to statistics: in the mechanical component lost efficacy, nearly 75% "--80% belongs to galling causes.The nearly 30%-50% of energy of supply equipment is consumed in friction and wear process.Parts depreciation not only affected the performance of machinery equipment end-use performance after losing efficacy, and needed to consume a large amount of human and material resources replacing accessory and servicing installation.By the financial loss caused of wearing and tearing, about 1,200 hundred million dollars/year, the U.S., Germany's about 50,000,000,000 marks/year.According to statistics in 2005, domestic annual consumption metal wear resistant material about reached more than 5,000,000 tons, is worth more than 55,000,000,000 yuan.As can be seen here, galling is one of principal mode causing mechanical component to lose efficacy, and galling is the major issue being related to the national economic development.In today of scientific and technical high speed development, each department of national economy all proposes requirements at the higher level to the wearing quality of mechanical means, reliability and precision.Therefore, the friction phenomenon of research metal and abrasion mechanism, inquire into the various factors of impact wearing and tearing, and improve the fastness to wear of metal, Study and Development New Kind of Anti-Abrasion material, becomes the important topic that scientific worker faces already.
In industrial circle, abrasive wear is most important a kind of wear type, accounts for 50%.Abrasive wear phenomenon is extensively present in most of mechanical means, particularly at mining machinery, agricultural machine, engineering machinery and foundry machinery etc., as various rubble machineries, excavator, tractor, coalcutter, the conveyor of transportation industry, and slush pump etc.Often be only for rock crushing plant as Hubei Province formula stoning machine, hammer crusher, reaction type stoning machine, impact breaker (sand machine processed), cone crusher, double-roll type stoning machine, slush pump etc. the high-abrasive material that consumes just more than 150,000 tons, be worth more than 2,000,000,000 yuan.Along with the quickening of transport development speed, wearing and tearing have become transportation industry ubiquity and have become the major cause causing equipment failure or material damage.In order to improve the service efficiency of the equipment such as transportation industry rock crushing plant and concrete pump, reducing frequency of maintenance, reducing production cost.Therefore, research and development a new generation high-abrasive material, reduces galling, has great importance to the development of China's transport development.
In order to obtain more high rigidity and wear resistance, generally need to improve carbon and alloying element content, when carbon content increases, often cause material to occur crackle because heat treating regime is improper in heat treatment process, existing heat treating regime is difficult to be applied in casting high-carbon high-alloy material heat treatment.
For high-alloy steel materials, generally adopt high chromium steel more, sometimes also adopt rapid steel and matrix steel, but effect is all not ideal.This is because there is thick M7c3 eutectic carbides in high chromium steel, even if conducting forging processing also can only partly be smashed, cause the low wear resistance that causes of obdurability poor thus.Although rapid steel wear resistance is very high, there is thick eutectic carbides, toughness is poor, easy tipping in use procedure, and processing and thermal treatment cost higher.Matrix steel obdurability is better, but almost all dissolves due to carbide during quenching, and therefore wear resistance is not ideal enough.During matrix steel quenching austenitizing, crystal grain is easily grown up, and easily quasi-cleavage crack occurs as thin blade tip angle tool and mould, use properties is also undesirable.
High alloy mould steel is mainly used in antagonism tempering and wear resistance requires higher operating mode, and low-alloy mould steel is mainly used in less demanding to temper resistance but higher to toughness reguirements occasion.In actual production, in order to enhance productivity and work-ing life, although require it is not very high occasion to temper resistance, also often select high alloy mould steel.But, along with the development of producing, people recognize the less demanding processing occasion of a lot of temper resistance gradually, use high quality steel because not utilizing its high-temperature resistant tempered property, it is a kind of using method of wasting alloying element, on the contrary also can be excessive due to alloy amount, make Carbide Coarsening and do not reach due toughness.But for low-alloy mould steel, when using working temperature to exceed tempering temperature, often not reaching due temper resistance, causing wear resistance too low.
In the alloy designs of actual mould steel, in order to improve the intensity of high-carbon low-alloy steel, wear resistance and temper resistance, often considering to increase its alloy content, making it to become high carbon medium-alloy steel.But high carbon medium-alloy steel may cause carbide agglomeration, not easily refinement, the performance such as obdurability, fatigue crack-resistant of steel is had a certain impact.And owing to improve quenching temperature, cause quenching remained austenite content to increase, need again to improve tempering temperature to promote that residual austenite is decomposed, make hardness decline thus on the contrary, have impact on the use properties of Medium Alloy Steel.Domestic and international mould steel always lacks high carbon medium-alloy steel kind, therefore need to develop applicable low temperature quenching, in microstructure, there is some amount, the tiny carbide of size and distributional pattern, there is higher hardness and obdurability simultaneously, to meet the high-carbon interalloy mould steel that use properties requires.The middle and high steel alloy of existing most of high-carbon is difficult to by the processing of conventional forging rolling and thermal treatment process the object reaching refinement, and difficulty in technique can be increased by the processing of complicated forging rolling or thermal treatment process, and consume the more energy, be often also difficult to reach desirable degree of refinement.Because high-carbon alloy steel to reach the target relative difficulty of refinement by alloying, although research both at home and abroad is more, also there is no clear and definite solution.
Corrosion is the one of the main reasons causing metallic conduit to destroy and lost efficacy.The environment causing metallic substance that corrosion occurs mainly contains two large classes: a class is physical environment, as more weak corrosive environments such as natural atmosphere, ocean, soil; Another kind of is industrial environment, as severe corrosive industrial gasses and industry solution etc.In the corrosion with normal physical environment, its form of corrosion belongs to galvanic corrosion and biochemical corrosion, and effect is more weak, and corrosion speed is comparatively slow, and short term corrosion destroys less, but potential hazard is larger; And if metal for purposes such as severe corrosive industrial gasses, solution environmental and sewage discharges time, its form of corrosion belongs to chemical corrosion, and effect is strong, and corrosion reaction is violent, and destructiveness is very strong.So the corrosion of metallic conduit is relevant with the environment residing for it and delivery medium.So, in order to improve the work-ing life of metallic conduit,
Corrosion protection coating must possess following essential characteristic:
(1) corrosion resistance and good.The corrosive medium that finger coating contacts it is all stable physically and chemically, and the medium that is neither corroded is swelling, dissolving, also not by corrosive medium is destroyed, decomposes.
(2) ventilation property and water permeability little.Corrosion of metal under coating, be in essence be penetrated into coating and metal due to water and oxygen etc. interface on cause, so filmogen that ventilation property is little and the large filler of shielding effect must be selected, and making the thickness that coating reaches certain, critical thickness depends on the character of film-forming resin and the disposition etc. of metallic surface.
(3) good sticking power and certain physical strength will be had.Whether coating can be attached on metallic matrix securely, is that can coating one of the key factor playing protective effect.
Along with developing rapidly of modern industry and national defense construction, more and more higher to the requirement of equipment resistance to elevated temperatures.Compare with other high temperature oxidation corrosion resistance means, the advantages such as high-temperature resistant coating is good with its large-area construction processing performance, cost is low, Be very effective are favored, be widely used in the high temperature places such as iron and steel chimney, high-temperature pipe, High Temperature Furnaces Heating Apparatus, petroleum cracking device and military industry equipment, delay the hardwares such as iron and steel oxidation corrosion at high temperature, guarantee equipment life-time service.Usually, the coating of withstand long term exposure more than 200 DEG C high temperature heat resisting coating can be called as.And in actual industrial production, temperature is the factor affecting heat resisting coating work-ing life, in addition, acid, alkali, salt and solvent are also the important factors affecting heat resisting coating work-ing life.Current, at the energy, under in the fields such as chemical industry, metallurgy, building materials, many steel pipes (such as transport pipe, flue etc.) are in the effect of damp and hot flue gas substantially, seriously corroded, and the working temperature of these equipment can be greater than 200 DEG C often, even reaches 600 DEG C.
According to statistics, domestic market to the annual requirement of high-temperature resistant coating at about 600-800 tons, and the actual annual production of China only about 200 tons, and product spreads unchecked, the problems such as ubiquity package stability is poor, poor adhesive force, easily embrittlement, high temperature resistant timeliness are short.Therefore, the fire-resistant anticorrosion paint of research and development excellent property is the active demand of Economic Development, has huge application prospect and the market requirement.Existing conventional protective system has: epoxypaint, polyurethane coating, phosphorus sheet cold coating, inorganic zinc coating etc., but usually adopts organic polymer to be base material due to these corrosion protection coatings, is not suitable for using in high temperature or high corrosive environment.Therefore the pipeline coatings studying the requirement simultaneously meeting temperature tolerance and preservative property has realistic meaning.
Summary of the invention
The object of the invention is the preparation method of the anticorrosion antiwear pipeline providing a kind of conveying mineral, its first object, be to provide a kind of carbide tissue distribution even, the antifriction metal (AFM) pipeline body that surface quality is good, hardness is high, second object be on the basis of antifriction metal (AFM) pipeline, provide that excellent in durability, hardness are high, acid and alkali-resistance and the preservative coat of high temperature can be born, the 3rd object is to provide the wear-resistant coating of wear resisting property excellence.
For reaching above technical purpose, the invention provides following technical scheme:
A preparation method for the anticorrosion antiwear pipeline of conveying mineral, is characterized in that, comprise following steps:
A) abrasion-proof pipe body is prepared
1) draw materials, select the raw material of following chemical component weight per-cent:
C：1.6~3.7%， V：4.5~8.5%，
W：3.2~9.1%， Mo：2.4~7.6%，
Cr：3.8~8.9%， RE：0.15~0.4%，
Mn：0.3~0.7%， Si：0.05~1.0%，
B：0.01-0.02%， Al：0.2~0.8%，
Nb：0.08~2.4%， Ni：0.1~0.3%，
Surplus is Fe and the inevitable impurity of trace;
2) ordinary scrap steel, extra low carbon ferrochromium, ferro-niobium, ferronickel, ferrotungsten, molybdenum-iron, ferrochrome and ferromanganese Hybrid Heating are melted, with the pig iron or graphite carburetting, Hybrid Heating is fused into molten steel, adds ferrosilicon and carry out pre-deoxidation after molten steel is melting down;
3) according to material composition proportioning, after stokehold adjusting component is qualified, be warming up to 1580-1630 DEG C, then add aluminium block and carry out final deoxidation, then come out of the stove;
4) be placed in bottom casting ladle by rare earth ferrosilicon alloy, ferro-boron, vanadium iron, pour method to molten steel compound modification treatment with in bag, high-carbon high-alloy steel molten steel is prefabricated to be completed;
5) on whizzer, place type tube and pour in type tube by prefabricated molten steel, rotational casting becomes thickness to be the steel pipe of 30 ~ 35mm;
6), after rotational casting completes, the parking demoulding when casting-pipe inner wall temperature drops to below 200 DEG C, is separated cast tube with type tube and takes out;
7) first cast tube is quenched, at temperature is 910 ~ 950 DEG C be incubated 180 ~ 220min, then with the speed of cooling oil cooling of 55 ~ 70 DEG C/S to room temperature, carry out high tempering again, cast tube be heated to 720 ~ 740 DEG C and be incubated 150 ~ 180min, stove is chilled to room temperature, thus completes Tempering and Quenching;
8) cast tube through above-mentioned process reheated to temperature 930 ~ 980 DEG C and be incubated 110 ~ 130min, then with the speed of cooling oil cooling of 70 ~ 85 DEG C/S to room temperature, thus make alloying element be solid-solution in matrix metal, complete solution strengthening thermal treatment;
9) finally double tempering dispersion hardening thermal treatment process is carried out again: Tempering temperature is 350 ~ 400 DEG C, and soaking time is 70 ~ 90min, and air cooling is to room temperature; Double tempering temperature is 520 ~ 550 DEG C, soaking time 70 ~ 90min, and air cooling, to room temperature, completes the thermal treatment for cast tube;
10) to carrying out through heat treated cast tube pipeline taking off outside interior boring, the machining of inside and outside circle grinding, obtain abrasion-proof pipe body;
B) outer wall resistance to high temperature oxidation corrosion protection coating is prepared
1) raw material of following chemical component weight ratio is selected:
The Union carbide A-162 of 23 ~ 25 weight parts;
The dimethyldiethoxysilane of 7 ~ 8 weight parts;
The NaOH of 0.8 ~ 0.9 weight part;
The Al of 2 ~ 3 weight parts
2o
3;
The TiO of 0.3 ~ 0.4 weight part
2;
The methyl glycol of 9 ~ 11 weight parts;
The water of 4 ~ 5 weight parts;
2) by the Union carbide A-162 in above-mentioned raw materials and dimethyldiethoxysilane mixing, the NaOH of corresponding proportioning in raw material is added after magnetic agitation is even, at room temperature stirring reaction 16 hours;
3) in the solution obtained by above-mentioned steps, slowly add the water of corresponding proportioning in raw material, after finishing, at room temperature continue reaction 2 hours, obtain water glass adhesive liquid solution;
4) by the Al in above-mentioned raw materials
2o
3and TiO
2join in methyl glycol, adopt ultrasonic wave dispersion, obtain finely dispersed Al
2o
3, TiO
2dispersion liquid, then join in the obtained water glass adhesive liquid solution of above-mentioned steps, stirred at ambient temperature evenly obtains water glass nano composite dope;
5) by steps A) obtained abrasion-proof pipe body outer wall carry out derusting by sandblast or chemical pickling rust cleaning, cleaning, bonderizing, above-mentioned steps being synthesized the water glass nano composite dope obtained adopts spin-coating method to be applied on pipeline body outer wall, after rete at room temperature drying, solidification obtains stable rete, adopt nitrogen as shielding gas again, pipe temperature be elevated to 400 DEG C and keep 30 minutes, then cool in the environment of shielding gas all the time, obtain resistance to high temperature oxidation anti-corrosive film coating layer at pipeline outer wall;
C) inwall wear-resistant coating is prepared
1) each feed composition is taken according to following proportioning;
TiO
2 25~55wt.%
NiCrBSiFe 9~27wt.%
Cr
2O
320~38wt.%
C-Ni 10 ~ 15wt.%, wherein Ni weight content is 60 ~ 75%
2) said components powder is carried out mechanically mixing, the powder mixing machine time is not less than 30 minutes;
3) sandblasting is carried out to pipeline body inwall;
4) powder after above-mentioned mechanically mixing is sprayed as feeding, form high temperature and high speed plasma jet by plasma gun, repeatedly the final coating obtaining 150 ~ 250 μm of spraying;
The anticorrosion antiwear pipeline of final obtained conveying mineral.
The present invention compared with prior art, has following beneficial effect:
1) abrasion-proof pipe body of the present invention have selected suitable component by a large amount of optimization experiment, obtains high-carbon high-alloy steel; Then in the thermal treatment process of cast tube, first quenching is adopted to increase temperature the Tempering and Quenching of tempering, to replace isothermal annealing thermal treatment process conventional in general rotary casting high-carbon high-alloy steel heat treatment process, substantially reduce heat treatment cycle, increase work efficiency; Secondly after solution strengthening thermal treatment, double tempering dispersion hardening thermal treatment process is carried out again, make carbide tissue distribution in cast tube even, substantially reduce segregation phenomena, surface quality is good, and occurs secondary hardening, is matrix with martensite in finally obtained abrasion-proof pipe cast tube, containing a large amount of carbide hard phase, hardness is high, and product hardness reaches 66-69HRC, has good wear resisting property.
2) for anticorrosion external coating (EC) of the present invention, equally through the preferred suitable component of overtesting, water glass and nano-oxide particles are reacted, form cross structure, this coating is water-fast, acid-and base-resisting, organic solvent-resistant ability are strong, hardness is high, especially can bear the high temperature of more than 600 DEG C, has excellent resistance to high temperature oxidation function and rub resistance function;
3) for wear-resisting undercoat of the present invention, ceramic matrix TiO is contained
2, particle is less and have the Cr of extreme hardness, wear resistance
2o
3as enhanced granule, the self-fluxing alloy NiCrBSiFe of bonding strength between matrix material, toughness can be improved, there is the lubricant C-Ni of good solid lubrication effect, the wear resistance of coating, cohesive strength, splitting resistance can be significantly improved, and effectively reduce the frictional coefficient of coating;
4) the present invention adopts common centrifugal casting apparatus, circuit and usual spray equipment, and production cost is low, is easy to promote.
Embodiment
Embodiment given below is intended so that the invention will be further described; but can not be interpreted as it is limiting the scope of the invention; some nonessential improvement and adjustment that person skilled in art makes the present invention according to the content of the invention described above, still belong to protection scope of the present invention.
embodiment 1
A) abrasion-proof pipe body is prepared
1) draw materials, select the raw material of following chemical component weight per-cent:
C：1.6%， V：4.5%，
W：9.1%， Mo：7.6%，
Cr：3.8%， RE：0.15%，
Mn：0.7%， Si：0.05%，
B： 0.02%， Al：0.2%，
Nb：0.08%， Ni：0.1%，
Surplus is Fe and the inevitable impurity of trace;
2) ordinary scrap steel, extra low carbon ferrochromium, ferro-niobium, ferronickel, ferrotungsten, molybdenum-iron, ferrochrome and ferromanganese Hybrid Heating are melted, with the pig iron or graphite carburetting, Hybrid Heating is fused into molten steel, adds ferrosilicon and carry out pre-deoxidation after molten steel is melting down;
3) according to material composition proportioning, after stokehold adjusting component is qualified, be warming up to 1580 DEG C, then add aluminium block and carry out final deoxidation, then come out of the stove;
4) be placed in bottom casting ladle by rare earth ferrosilicon alloy, ferro-boron, vanadium iron, pour method to molten steel compound modification treatment with in bag, high-carbon high-alloy steel molten steel is prefabricated to be completed;
5) on whizzer, place type tube and pour in type tube by prefabricated molten steel, rotational casting becomes thickness to be the steel pipe of 30mm;
6), after rotational casting completes, the parking demoulding when casting-pipe inner wall temperature drops to below 200 DEG C, is separated cast tube with type tube and takes out;
7) first cast tube is quenched, at temperature is 910 DEG C, is incubated 180min, then with the speed of cooling oil cooling of 55 DEG C/S to room temperature, then carry out high tempering, cast tube be heated to 720 DEG C and be incubated 150min, stove is chilled to room temperature, thus completes Tempering and Quenching;
8) cast tube through above-mentioned process reheated to temperature 930 DEG C and be incubated 110min, then with the speed of cooling oil cooling of 70 DEG C/S to room temperature, thus make alloying element be solid-solution in matrix metal, complete solution strengthening thermal treatment;
9) finally double tempering dispersion hardening thermal treatment process is carried out again: Tempering temperature is 350 DEG C, and soaking time is 70min, and air cooling is to room temperature; Double tempering temperature is 520 DEG C, soaking time 70min, and air cooling, to room temperature, completes the thermal treatment for cast tube;
10) to carrying out through heat treated cast tube pipeline taking off outside interior boring, the machining of inside and outside circle grinding, obtain abrasion-proof pipe body;
B) outer wall resistance to high temperature oxidation corrosion protection coating is prepared
1) raw material of following chemical component weight ratio is selected:
The Union carbide A-162 of 23 weight parts;
The dimethyldiethoxysilane of 8 weight parts;
The NaOH of 0.8 weight part;
The Al of 2 weight parts
2o
3;
The TiO of 0.3 weight part
2;
The methyl glycol of 9 weight parts;
The water of 4 weight parts;
2) by the Union carbide A-162 in above-mentioned raw materials and dimethyldiethoxysilane mixing, the NaOH of corresponding proportioning in raw material is added after magnetic agitation is even, at room temperature stirring reaction 16 hours;
3) in the solution obtained by above-mentioned steps, slowly add the water of corresponding proportioning in raw material, after finishing, at room temperature continue reaction 2 hours, obtain water glass adhesive liquid solution;
4) by the Al in above-mentioned raw materials
2o
3and TiO
2join in methyl glycol, adopt ultrasonic wave dispersion, obtain finely dispersed Al
2o
3, TiO
2dispersion liquid, then join in the obtained water glass adhesive liquid solution of above-mentioned steps, stirred at ambient temperature evenly obtains water glass nano composite dope;
5) by steps A) obtained abrasion-proof pipe body outer wall carry out derusting by sandblast or chemical pickling rust cleaning, cleaning, bonderizing, above-mentioned steps being synthesized the water glass nano composite dope obtained adopts spin-coating method to be applied on pipeline body outer wall, after rete at room temperature drying, solidification obtains stable rete, adopt nitrogen as shielding gas again, pipe temperature be elevated to 400 DEG C and keep 30 minutes, then cool in the environment of shielding gas all the time, obtain resistance to high temperature oxidation anti-corrosive film coating layer at pipeline outer wall;
C) inwall wear-resistant coating is prepared
1) each feed composition is taken according to the said ratio of inwall wear-resistant coating;
2) said components powder is carried out mechanically mixing, the powder mixing machine time is not less than 30 minutes;
3) sandblasting is carried out to pipeline body inwall;
4) powder after above-mentioned mechanically mixing is sprayed as feeding, form high temperature and high speed plasma jet by plasma gun, select Ar airshed 39L/min, H
2airshed 9L/min, electric current 600A, spray power is about 42Kw, spray distance 100mm, after powder feeding rate 40g/min powder feeding air propels mixed powder enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and is accelerated by plasma jet, form the spraying particle bundle flying to matrix surface, particle beam strikes through matrix surface; Each spraying at least 10min interval time, each coating thickness, not higher than 50 μm, treats that matrix surface temperature sprays lower than 200 DEG C next time again; The final coating obtaining 200 μm of spraying repeatedly,
Final obtained anticorrosion antiwear pipeline.
The abrasion-proof pipe obtained to above-described embodiment carries out hardness and bending strength test, and recording hardness is 67HRC, and bending strength is 1442Mp.Test corrosion protection coating, layer of lacquer film hardness is 7H again, and be immersed in 4 days coatings in 10% sulfuric acid and do not bubble or obscission, measure after 1.5 hours in the smoke mixture of conveying 630 DEG C, pipeline outer-layer is not oxidized.Finally test wear-resistant coating, microhardness reaches more than 650Mpa.
embodiment 2
A) abrasion-proof pipe body is prepared
1) draw materials, select the raw material of following chemical component weight per-cent:
C：2.7%， V：6.0%，
W：6.9%， Mo：5.3%，
Cr：5.4%， RE：0.23%，
Mn：0.6%， Si：0.08%，
B：0.01%， Al：0.5%，
Nb：1.1%， Ni：0.2%，
Surplus is Fe and the inevitable impurity of trace;
2) ordinary scrap steel, extra low carbon ferrochromium, ferro-niobium, ferronickel, ferrotungsten, molybdenum-iron, ferrochrome and ferromanganese Hybrid Heating are melted, with the pig iron or graphite carburetting, Hybrid Heating is fused into molten steel, adds ferrosilicon and carry out pre-deoxidation after molten steel is melting down;
3) according to material composition proportioning, after stokehold adjusting component is qualified, be warming up to 1600 DEG C, then add aluminium block and carry out final deoxidation, then come out of the stove;
4) be placed in bottom casting ladle by rare earth ferrosilicon alloy, ferro-boron, vanadium iron, pour method to molten steel compound modification treatment with in bag, high-carbon high-alloy steel molten steel is prefabricated to be completed;
5) on whizzer, place type tube and pour in type tube by prefabricated molten steel, rotational casting becomes thickness to be the steel pipe of 30 ~ 35mm;
6), after rotational casting completes, the parking demoulding when casting-pipe inner wall temperature drops to below 200 DEG C, is separated cast tube with type tube and takes out;
7) first cast tube is quenched, at temperature is 930 DEG C, is incubated 200min, then with the speed of cooling oil cooling of 65 DEG C/S to room temperature, then carry out high tempering, cast tube be heated to 730 DEG C and be incubated 160min, stove is chilled to room temperature, thus completes Tempering and Quenching;
8) cast tube through above-mentioned process reheated to temperature 950 DEG C and be incubated 120min, then with the speed of cooling oil cooling of 75 DEG C/S to room temperature, thus make alloying element be solid-solution in matrix metal, complete solution strengthening thermal treatment;
9) finally double tempering dispersion hardening thermal treatment process is carried out again: Tempering temperature is 380 DEG C, and soaking time is 80min, and air cooling is to room temperature; Double tempering temperature is 540 DEG C, soaking time 80min, and air cooling, to room temperature, completes the thermal treatment for cast tube;
10) to carrying out through heat treated cast tube pipeline taking off outside interior boring, the machining of inside and outside circle grinding, obtain abrasion-proof pipe body;
B) outer wall resistance to high temperature oxidation corrosion protection coating is prepared
1) raw material of following chemical component weight ratio is selected:
The Union carbide A-162 of 24 weight parts;
The dimethyldiethoxysilane of 8 weight parts;
The NaOH of 0.9 weight part;
The Al of 2.5 weight parts
2o
3;
The TiO of 0.36 weight part
2;
The methyl glycol of 10 weight parts;
The water of 4.8 weight parts;
2) by the Union carbide A-162 in above-mentioned raw materials and dimethyldiethoxysilane mixing, the NaOH of corresponding proportioning in raw material is added after magnetic agitation is even, at room temperature stirring reaction 16 hours;
3) in the solution obtained by above-mentioned steps, slowly add the water of corresponding proportioning in raw material, after finishing, at room temperature continue reaction 2 hours, obtain water glass adhesive liquid solution;
4) by the Al in above-mentioned raw materials
2o
3and TiO
2join in methyl glycol, adopt ultrasonic wave dispersion, obtain finely dispersed Al
2o
3, TiO
2dispersion liquid, then join in the obtained water glass adhesive liquid solution of above-mentioned steps, stirred at ambient temperature evenly obtains water glass nano composite dope;
5) by steps A) obtained abrasion-proof pipe body outer wall carry out derusting by sandblast or chemical pickling rust cleaning, cleaning, bonderizing, above-mentioned steps being synthesized the water glass nano composite dope obtained adopts spin-coating method to be applied on pipeline body outer wall, after rete at room temperature drying, solidification obtains stable rete, adopt nitrogen as shielding gas again, pipe temperature be elevated to 400 DEG C and keep 30 minutes, then cool in the environment of shielding gas all the time, obtain resistance to high temperature oxidation anti-corrosive film coating layer at pipeline outer wall;
C) inwall wear-resistant coating is prepared
1) each feed composition is taken according to the said ratio of inwall wear-resistant coating;
2) said components powder is carried out mechanically mixing, the powder mixing machine time is not less than 30 minutes;
3) sandblasting is carried out to pipeline body inwall;
4) powder after above-mentioned mechanically mixing is sprayed as feeding, form high temperature and high speed plasma jet by plasma gun, select Ar airshed 39L/min, H
2airshed 9L/min, electric current 600A, spray power is about 42Kw, spray distance 100mm, after powder feeding rate 40g/min powder feeding air propels mixed powder enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and is accelerated by plasma jet, form the spraying particle bundle flying to matrix surface, particle beam strikes through matrix surface; Each spraying at least 10min interval time, each coating thickness, not higher than 50 μm, treats that matrix surface temperature sprays lower than 200 DEG C next time again; The final coating obtaining 200 μm of spraying repeatedly,
Final obtained anticorrosion antiwear pipeline.
The abrasion-proof pipe obtained to above-described embodiment carries out hardness and bending strength test, and recording hardness is 68HRC, and bending strength is 1432Mp.Test corrosion protection coating, layer of lacquer film hardness is 7H again, and be immersed in 4 days coatings in 10% water and do not bubble or obscission, measure after 2 hours in the smoke mixture of conveying 680 DEG C, pipeline outer-layer is not oxidized.Finally test wear-resistant coating, microhardness reaches more than 650Mpa.
embodiment 3
A) abrasion-proof pipe body is prepared
1) draw materials, select the raw material of following chemical component weight per-cent:
C： 3.7%， V： 8.5%，
W： 3.2%， Mo： 2.4%，
Cr： 8.9%， RE： 0.4%，
Mn：0.3%， Si： 1.0%，
B：0.01%， Al： 0.8%，
Nb： 2.4%， Ni： 0.3%，
Surplus is Fe and the inevitable impurity of trace;
2) ordinary scrap steel, extra low carbon ferrochromium, ferro-niobium, ferronickel, ferrotungsten, molybdenum-iron, ferrochrome and ferromanganese Hybrid Heating are melted, with the pig iron or graphite carburetting, Hybrid Heating is fused into molten steel, adds ferrosilicon and carry out pre-deoxidation after molten steel is melting down;
3) according to material composition proportioning, after stokehold adjusting component is qualified, be warming up to 1630 DEG C, then add aluminium block and carry out final deoxidation, then come out of the stove;
4) be placed in bottom casting ladle by rare earth ferrosilicon alloy, ferro-boron, vanadium iron, pour method to molten steel compound modification treatment with in bag, high-carbon high-alloy steel molten steel is prefabricated to be completed;
5) prefabricated molten steel being poured into rotational casting in horizontal centrifugal casting machine becomes thickness to be the high-carbon high-alloy steel pipe of 35mm; Centrifugal casting casting mold adopts double-level-metal type;
6), after rotational casting completes, the parking demoulding when casting-pipe inner wall temperature drops to below 200 DEG C, is separated cast tube with type tube and takes out;
7) first cast tube is quenched, at temperature is 910 ~ 950 DEG C, is incubated 220min, then with the speed of cooling oil cooling of 70 DEG C/S to room temperature, carry out high tempering again, cast tube be heated to 740 DEG C and be incubated 180min, stove is chilled to room temperature, thus completes Tempering and Quenching;
8) cast tube through above-mentioned process reheated to temperature 980 DEG C and be incubated 130min, then with the speed of cooling oil cooling of 85 DEG C/S to room temperature, thus make alloying element be solid-solution in matrix metal, complete solution strengthening thermal treatment;
9) finally double tempering dispersion hardening thermal treatment process is carried out again: Tempering temperature is 400 DEG C, and soaking time is 90min, and air cooling is to room temperature; Double tempering temperature is 550 DEG C, soaking time 90min, and air cooling, to room temperature, completes the thermal treatment for cast tube;
10) to carrying out through heat treated cast tube pipeline taking off outside interior boring, the machining of inside and outside circle grinding, obtain abrasion-proof pipe body;
B) outer wall antirust coating is prepared
1) electrostatic spraying mode is used by polyethylene powder coating to be coated in steps A) on the outer wall of obtained abrasion-proof pipe body;
C) outer wall resistance to high temperature oxidation corrosion protection coating is prepared
1) raw material of following chemical component weight ratio is selected:
The Union carbide A-162 of 25 weight parts;
The dimethyldiethoxysilane of 7 weight parts;
The NaOH of 0.9 weight part;
The Al of 3 weight parts
2o
3;
The TiO of 0.4 weight part
2;
The methyl glycol of 11 weight parts;
The water of 5 weight parts;
2) by the Union carbide A-162 in above-mentioned raw materials and dimethyldiethoxysilane mixing, the NaOH of corresponding proportioning in raw material is added after magnetic agitation is even, at room temperature stirring reaction 16 hours;
3) in the solution obtained by above-mentioned steps, slowly add the water of corresponding proportioning in raw material, after finishing, at room temperature continue reaction 2 hours, obtain water glass adhesive liquid solution;
4) by the Al in above-mentioned raw materials
2o
3and TiO
2join in methyl glycol, adopt ultrasonic wave dispersion, obtain finely dispersed Al
2o
3, TiO
2dispersion liquid, then join in the obtained water glass adhesive liquid solution of above-mentioned steps, stirred at ambient temperature evenly obtains water glass nano composite dope;
5) by steps A) obtained abrasion-proof pipe body outer wall carry out derusting by sandblast or chemical pickling rust cleaning, cleaning, bonderizing, above-mentioned steps being synthesized the water glass nano composite dope obtained adopts spin-coating method to be applied on pipeline body outer wall, after rete at room temperature drying, solidification obtains stable rete, adopt nitrogen as shielding gas again, pipe temperature be elevated to 400 DEG C and keep 30 minutes, then cool in the environment of shielding gas all the time, obtain resistance to high temperature oxidation anti-corrosive film coating layer at pipeline outer wall;
C) inwall wear-resistant coating is prepared
1) each feed composition is taken according to the said ratio of inwall wear-resistant coating;
2) said components powder is carried out mechanically mixing, the powder mixing machine time is not less than 30 minutes;
3) sandblasting is carried out to pipeline body inwall;
4) powder after above-mentioned mechanically mixing is sprayed as feeding, form high temperature and high speed plasma jet by plasma gun, select Ar airshed 39L/min, H
2airshed 9L/min, electric current 600A, spray power is about 42Kw, spray distance 100mm, after powder feeding rate 40g/min powder feeding air propels mixed powder enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and is accelerated by plasma jet, form the spraying particle bundle flying to matrix surface, particle beam strikes through matrix surface; Each spraying at least 10min interval time, each coating thickness, not higher than 50 μm, treats that matrix surface temperature sprays lower than 200 DEG C next time again; The final coating obtaining 200 μm of spraying repeatedly,
Final obtained anticorrosion antiwear pipeline.
The abrasion-proof pipe obtained to above-described embodiment carries out hardness and bending strength test, and recording hardness is 69HRC, and bending strength is 1421Mp.Test corrosion protection coating, layer of lacquer film hardness is 7H again, and be immersed in 4 days coatings in 10%NaOH and do not bubble or obscission, measure after 2 hours in the smoke mixture of conveying 600 DEG C, pipeline outer-layer is not oxidized.Finally test wear-resistant coating, microhardness reaches more than 650Mpa.
In above-described embodiment: each raw material adopted is commercially available prod.
The invention is not restricted to above-described embodiment, all can implement described in content of the present invention and there is described good result.
Claims (1)
1. a preparation method for the anticorrosion antiwear pipeline of conveying mineral, is characterized in that, comprise following steps:
A) abrasion-proof pipe body is prepared
1) draw materials, select the raw material of following chemical component weight per-cent:
C：1.6~3.7%， V：4.5~8.5%，
W：3.2~9.1%， Mo：2.4~7.6%，
Cr：3.8~8.9%， RE：0.15~0.4%，
Mn：0.3~0.7%， Si：0.05~1.0%，
B：0.01-0.02%， Al：0.2~0.8%，
Nb：0.08~2.4%， Ni：0.1~0.3%，
Surplus is Fe and the inevitable impurity of trace;
2) ordinary scrap steel, extra low carbon ferrochromium, ferro-niobium, ferronickel, ferrotungsten, molybdenum-iron, ferrochrome and ferromanganese Hybrid Heating are melted, with the pig iron or graphite carburetting, Hybrid Heating is fused into molten steel, adds ferrosilicon and carry out pre-deoxidation after molten steel is melting down;
3) according to material composition proportioning, after stokehold adjusting component is qualified, be warming up to 1580-1630 DEG C, then add aluminium block and carry out final deoxidation, then come out of the stove;
4) be placed in bottom casting ladle by rare earth ferrosilicon alloy, ferro-boron, vanadium iron, pour method to molten steel compound modification treatment with in bag, high-carbon high-alloy steel molten steel is prefabricated to be completed;
5) on whizzer, place type tube and pour in type tube by prefabricated molten steel, rotational casting becomes thickness to be the steel pipe of 30 ~ 35mm;
6), after rotational casting completes, the parking demoulding when casting-pipe inner wall temperature drops to below 200 DEG C, is separated cast tube with type tube and takes out;
7) first cast tube is quenched, at temperature is 910 ~ 950 DEG C be incubated 180 ~ 220min, then with the speed of cooling oil cooling of 55 ~ 70 DEG C/S to room temperature, carry out high tempering again, cast tube be heated to 720 ~ 740 DEG C and be incubated 150 ~ 180min, stove is chilled to room temperature, thus completes Tempering and Quenching;
8) cast tube through above-mentioned process reheated to temperature 930 ~ 980 DEG C and be incubated 110 ~ 130min, then with the speed of cooling oil cooling of 70 ~ 85 DEG C/S to room temperature, thus make alloying element be solid-solution in matrix metal, complete solution strengthening thermal treatment;
9) finally double tempering dispersion hardening thermal treatment process is carried out again: Tempering temperature is 350 ~ 400 DEG C, and soaking time is 70 ~ 90min, and air cooling is to room temperature; Double tempering temperature is 520 ~ 550 DEG C, soaking time 70 ~ 90min, and air cooling, to room temperature, completes the thermal treatment for cast tube;
10) to carrying out through heat treated cast tube pipeline taking off outside interior boring, the machining of inside and outside circle grinding, obtain abrasion-proof pipe body;
B) outer wall resistance to high temperature oxidation corrosion protection coating is prepared
1) raw material of following chemical component weight ratio is selected:
The Union carbide A-162 of 23 ~ 25 weight parts;
The dimethyldiethoxysilane of 7 ~ 8 weight parts;
The NaOH of 0.8 ~ 0.9 weight part;
The Al of 2 ~ 3 weight parts
2o
3;
The TiO of 0.3 ~ 0.4 weight part
2;
The methyl glycol of 9 ~ 11 weight parts;
The water of 4 ~ 5 weight parts;
2) by the Union carbide A-162 in above-mentioned raw materials and dimethyldiethoxysilane mixing, the NaOH of corresponding proportioning in raw material is added after magnetic agitation is even, at room temperature stirring reaction 16 hours;
3) in the solution obtained by above-mentioned steps, slowly add the water of corresponding proportioning in raw material, after finishing, at room temperature continue reaction 2 hours, obtain water glass adhesive liquid solution;
4) by the Al in above-mentioned raw materials
2o
3and TiO
2join in methyl glycol, adopt ultrasonic wave dispersion, obtain finely dispersed Al
2o
3, TiO
2dispersion liquid, then join in the obtained water glass adhesive liquid solution of above-mentioned steps, stirred at ambient temperature evenly obtains water glass nano composite dope;
5) by steps A) obtained abrasion-proof pipe body outer wall carry out derusting by sandblast or chemical pickling rust cleaning, cleaning, bonderizing, above-mentioned steps being synthesized the water glass nano composite dope obtained adopts spin-coating method to be applied on pipeline body outer wall, after rete at room temperature drying, solidification obtains stable rete, adopt nitrogen as shielding gas again, pipe temperature be elevated to 400 DEG C and keep 30 minutes, then cool in the environment of shielding gas all the time, obtain resistance to high temperature oxidation anti-corrosive film coating layer at pipeline outer wall;
C) inwall wear-resistant coating is prepared
1) each feed composition is taken according to following proportioning;
TiO
2 25~55wt.%
NiCrBSiFe 9~27wt.%
Cr
2O
320~38wt.%
C-Ni 10 ~ 15wt.%, wherein Ni weight content is 60 ~ 75%
2) said components powder is carried out mechanically mixing, the powder mixing machine time is not less than 30 minutes;
3) sandblasting is carried out to pipeline body inwall;
4) powder after above-mentioned mechanically mixing is sprayed as feeding, form high temperature and high speed plasma jet by plasma gun, repeatedly the final coating obtaining 150 ~ 250 μm of spraying;
The anticorrosion antiwear pipeline of final obtained conveying mineral.
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| CN103820732A (en) * | 2014-03-19 | 2014-05-28 | 江苏新亚特钢锻造有限公司 | Particle-reinforced chromium boron iron-based abrasion-resistant composite material for remanufacturing roller and preparation technology thereof |
| CN105371052A (en) * | 2015-12-03 | 2016-03-02 | 山东钢铁股份有限公司 | Wear-resisting device for dedusting pipeline |
| CN106282755A (en) * | 2016-08-10 | 2017-01-04 | 安徽禹王铸业有限公司 | Flexible anti-shock cast iron pipe |
| WO2018103082A1 (en) * | 2016-12-09 | 2018-06-14 | 孙瑞涛 | Heat-treated steel alloy |
| CN107365901A (en) * | 2017-06-06 | 2017-11-21 | 安徽腾龙泵阀制造有限公司 | A kind of processing method for improving chemical pump pump case case hardness |
| CN107829045A (en) * | 2017-09-05 | 2018-03-23 | 宁波市新光货架有限公司 | A kind of processing method of antifriction metal (AFM) shelf |
| CN111101077B (en) * | 2018-10-26 | 2021-08-17 | 宝山钢铁股份有限公司 | Low-cost high-wear-resistance stretch reducing roller and heat treatment process thereof |
| CN113970031A (en) * | 2020-10-23 | 2022-01-25 | 深圳优易材料科技有限公司 | Inner wall wear-resistant pipe and preparation method thereof |
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