CN112921235B - Low-temperature-resistant corrosion-resistant high-strength valve for deep sea and manufacturing method thereof - Google Patents
Low-temperature-resistant corrosion-resistant high-strength valve for deep sea and manufacturing method thereof Download PDFInfo
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- CN112921235B CN112921235B CN202011565317.1A CN202011565317A CN112921235B CN 112921235 B CN112921235 B CN 112921235B CN 202011565317 A CN202011565317 A CN 202011565317A CN 112921235 B CN112921235 B CN 112921235B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 34
- 230000007797 corrosion Effects 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 7
- 230000003712 anti-aging effect Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 4
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- 230000001914 calming effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 229920001973 fluoroelastomer Polymers 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 230000001624 sedative effect Effects 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005057 refrigeration Methods 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- 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
-
- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K49/00—Means in or on valves for heating or cooling
- F16K49/002—Electric heating means
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Valve Housings (AREA)
- Lift Valve (AREA)
Abstract
The invention is suitable for the technical field of refrigeration equipment, and provides a low-temperature-resistant corrosion-resistant high-strength valve for deep sea and a manufacturing method thereof, the low-temperature-resistant corrosion-resistant high-strength valve comprises a valve body, wherein two pipelines which are communicated with an inlet end and an outlet end are arranged in the valve body, a valve body for controlling on-off is arranged between the two pipelines, the pipeline is arranged into a telescopic expansion structure, two ends of the pipeline are fixed with the inner wall of the valve body through flexible sleeves, and the pipelines are formed by adjacent large circular arc sheets and small circular arc sheets which are arranged in an inserted mode in an annular interval manner and are used for adapting to different pressure conditions in deep sea and guaranteeing internal circulation; the expansion ring and the flexible belt which can expand and contract are adopted, automatic expansion adaptation is carried out on the pressure under water, the occurrence of cracks and the like caused by heat and cold shrinkage is avoided, the deformation resistance effect is increased or reduced, and meanwhile, the valve body is cast by using a special proportion, so that the valve body has excellent compressive strength, corrosion resistance and lower brittleness.
Description
Technical Field
The invention belongs to the technical field of underwater valves, and particularly relates to a low-temperature-resistant corrosion-resistant high-strength valve for deep sea and a manufacturing method thereof.
Background
The valve is a device for controlling the direction, pressure and flow rate of fluid in a fluid system, and is a device for enabling or stopping the flow of medium (liquid, gas and powder) in a pipe and equipment and controlling the flow rate of the medium, and the valve is a control component in a pipeline fluid conveying system and is used for changing the section of a passage and the flow direction of the medium, and has the functions of diversion, stop, throttling, non-return, diversion or overflow pressure relief and the like.
The current underwater valve is easy to deform due to external pressure or the surface of the valve body is corroded due to the operation environment, so that frequent replacement is needed.
Disclosure of Invention
The invention provides a low-temperature-resistant corrosion-resistant high-strength valve for a deep sea and a manufacturing method thereof, and aims to solve the problem that an underwater valve is easy to deform due to external environment.
The invention is realized in such a way, the invention relates to a low-temperature-resistant corrosion-resistant high-strength valve for the deep sea, which comprises a valve body, wherein two pipelines which are communicated with an inlet end and an outlet end are arranged in the valve body, a valve body for controlling on-off is arranged between the two pipelines, the pipeline is arranged into a telescopic expansion structure, the two ends of the pipeline are fixed with the inner wall of the valve body through a flexible sleeve, and the pipeline is formed by adjacent large arc sheets and small arc sheets which are arranged in an inserted manner in an annular interval manner and is used for adapting to different pressure conditions in the deep sea and ensuring internal circulation; the flexible sleeve is horn-shaped in the whole shape and is corrugated.
Preferably, two sides of the small arc piece slide in the large circular ring piece, and the small arc piece is connected with the inner wall of the inner cavity of the large circular arc piece through a flexible belt.
Preferably, the outer wall of the valve body is provided with three layers of anti-corrosion coatings from outside to inside, the outermost layer is an anti-corrosion layer, the secondary outer layer is an anti-aging layer, the innermost layer is a low-temperature layer, the low-temperature layer is made of polybutadiene materials, the anti-aging layer is made of polytetrafluoroethylene materials, and the anti-corrosion layer is made of fluororubber materials.
Preferably, a miniature turbine is arranged at the upper end of the valve body and is used for supplying power to the rotation of the valve core, a heating module is arranged inside the valve core, and the heating module is also used for supplying power through the turbine.
Preferably, the valve body consists of ：C：0.15-0.25％,Si：3-3.5％,Mn：2-2.5％,Nb：0.2-0.3％,Ti：0.17-0.22％,Co：0.25-0.35％,Ni：0.05-0.1％,Al：0.1-0.15％,Zn：0.15-0.2％,Cr：1.2-1.8％,B：0.005-0.008％,V：0.05-0.1％,Sn：0.015-0.025％,S≤0.025％,P≤0.03％, parts by mass of Fe and the balance of Fe.
The invention discloses a manufacturing method of a low-temperature-resistant corrosion-resistant high-strength valve for deep sea, which comprises the following steps: step S1, assembling a valve body and a valve core from top to bottom according to the steps of firstly, later and outwards;
s2, performing pressure and air tightness test on the assembled valve;
Step S3, if the valve meets the pressure and air tightness requirements, painting and packaging are carried out; if the pressure and air tightness requirements are not met, reworking is performed.
Preferably, wherein the manufacturing of the valve body comprises the steps of: step one, proportioning raw materials; smelting raw materials; step three, valve body pouring; fourthly, heat treatment; fifthly, treating the inner surface of the valve body; step six, drying for standby.
Preferably, step one: preparing a raw material for manufacturing the valve body, obtaining element types in the raw material through a spectrum analyzer, and obtaining the density of each element through a density detector so as to obtain the mass percent of each element; adding auxiliary materials according to the mass percentage of each element.
Preferably, step two: smelting raw materials for manufacturing the valve body into molten steel in smelting equipment, controlling the temperature at 1550-1680 ℃ and keeping for 1h; slag is formed by using a slag forming agent, and bottom blowing gas is blown into smelting equipment through a furnace bottom nozzle; stirring molten steel; transferring the molten steel subjected to primary smelting into a vacuum or inert gas-filled container for deoxidation, degassing and desulfurization, removing impurities contained in the molten steel, and obtaining the percentage of the impurities through a spectrum analyzer and a density detector; the primary refining step is repeated until the percentage of inclusions contained in the molten steel has not been significantly reduced or has been minimized.
Preferably, the third step is to raise the temperature of the molten steel to 1700-1850 ℃, and discharging and calm; after calming for 2-3min, pouring molten steel into a mould to form a valve body part; the slag former in the third step is a low-carbon submerged arc slag former, and comprises the following components in percentage: caO:68-72%, siO 2：5-10％,MgO：1-3％,Al2O3: 7-14%, al:4-5%, S:0.005-0.01%; the bottom blowing gas is Ar, N 2、CO2 or CH 4.
Preferably, step four: placing the valve body part formed by casting into an electric furnace, heating to 870-970 ℃ at a speed of not higher than 75 ℃/h, preserving heat for 4-5h, and cooling the furnace to room temperature; heating to 750-820 ℃ at a speed of not higher than 92 ℃/h, preserving heat for 3-4h, discharging from the furnace, and quenching in water at 65-80 ℃ to 300-375 ℃; heating to 385-420 ℃ in an electric furnace, performing low-temperature tempering treatment, preserving heat for 5 hours, discharging and air cooling; annealing: heating the valve body part to 920-955 ℃, preserving heat for 4-5h, cooling to 650-750 ℃ at the speed of 65-75 ℃/h, discharging and air cooling.
Preferably, step five: degreasing, airing, cleaning and draining the inner surface of the valve body after annealing and air cooling, and coating a film by using polyvinylidene fluoride.
Preferably, step six: and (3) placing the treated valve body part into a container at 75-80 ℃ for drying, and preserving heat for 1-1.5h.
Compared with the prior art, the invention has the beneficial effects that: according to the low-temperature-resistant corrosion-resistant high-strength valve for the deep sea and the manufacturing method thereof, disclosed by the invention, the expansion and contraction telescopic rings and the flexible belts are adopted to automatically carry out expansion and adaptation on the pressure under water, so that the phenomenon of cracking and the like caused by heat and cold contraction is avoided, the deformation-resistant effect is increased or reduced, and meanwhile, the valve body is cast by using a special proportion, so that the valve body has excellent compressive strength, corrosion resistance and lower brittleness.
Drawings
FIG. 1 is a schematic side view of the present invention;
FIG. 2 is a schematic elevational view of the present invention;
FIG. 3 is a schematic cross-sectional view of a pipeline according to the present invention;
In the figure: 1. a valve body; 11. a corrosion resistant layer; 12. an aging-resistant layer; 13. a low temperature layer; 2. a pipeline; 21. a large arc piece; 22. small arc pieces; 23. a flexible belt; 3. a valve core; 4. a flexible sleeve; 5. and a turbine.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a high strength valve is used in deep sea of corrosion-resistant low temperature, includes valve body 1, and the inside of valve body 1 is provided with two pipelines 2 that communicate into end and play end, is provided with the valve body 3 that is used for controlling the break-make between two pipelines 2, and this pipeline 2 sets up to flexible expansion structure and both ends are fixed mutually with valve body 1 inner wall through flexible cover 4, and pipeline 2 is formed by adjacent big circular arc piece 21 and little circular arc piece 22 annular interval that peg graft the setting for adapt to different pressure conditions in the deep sea, guarantee inside circulation.
In this embodiment, the flexible belt 23 is made of special materials, has the characteristics of flexibility, waterproofness, corrosion resistance, low temperature resistance and the like, and the flexible belt 23 is connected with the large arc piece 21 and the small arc piece 22, so that the side surface of the whole pipeline 2 is connected, the outflow of internal liquid is avoided, the annular large arc piece 21 and the small arc piece 22 which are mutually inserted and connected can be automatically adapted to different diameter ranges, the water supply flows with different apertures under different pressures are automatically adapted, the situation of cracks is avoided, the damage of a valve is ensured, the situation of frequent replacement and maintenance is avoided, and the small arc piece 22 also has flexibility for adapting to the bending under different curvatures.
The outer wall of the valve body 1 is provided with three layers of anti-corrosion coatings from outside to inside, the outermost layer is an anti-corrosion layer 11, the secondary outer layer is an anti-aging layer 12, the innermost layer is a low-temperature layer 13, the low-temperature layer 13 is made of polybutadiene materials, the anti-aging layer 12 is made of polytetrafluoroethylene materials, and the anti-corrosion layer 11 is made of fluororubber materials.
Further, a miniature turbine 5 is arranged at the upper end of the valve body 1 and is used for supplying power for the rotation of the valve core 3; the interior of the valve core 3 is provided with a heating module, and the heating module is also supplied with power by the turbine 5.
In the present embodiment, the turbine 5 uses flowing sea water and tide in the deep sea to generate electricity and store the electricity in a storage battery inside the valve, and a processor inside the valve controls the opening of the valve core 3 and the use of a heating module inside the valve core 3.
Further, the flexible sleeve 4 is horn-shaped in its overall shape and is corrugated.
In this embodiment, flexible and tubaeform flexible cover 4 carries out the adaptation to the pipeline 2 both ends that can radial expansion flexible change to connect pipeline 2 in the both sides of the passageway of middle case 3, guarantee to open and close the valve holistic when case 3 rotates, also avoid pipeline 2 unable and valve body 1 inner wall to fix, become unsettled state, guaranteed the normal use of pipeline 2, flexible cover 4 sets up to the elasticity form, convenient use of cooperation pipeline 22.
Further, the valve is assembled, and the valve body 1 and the valve core 3 are assembled from top to bottom according to the steps of assembling the valve from inside to outside; performing a pressure and air tightness test on the assembled valve; if the valve meets the pressure and air tightness requirements, painting and packaging are carried out; if the pressure and air tightness requirements are not met, reworking is performed.
The valve body 1 consists of ：C：0.15-0.25％,Si：3-3.5％,Mn：2-2.5％,Nb：0.2-0.3％,Ti：0.17-0.22％,Co：0.25-0.35％,Ni：0.05-0.1％,Al：0.1-0.15％,Zn：0.15-0.2％,Cr：1.2-1.8％,B：0.005-0.008％,V：0.05-0.1％,Sn：0.015-0.025％,S≤0.025％,P≤0.03％, of the following components in percentage by mass and the balance of Fe.
In this embodiment, the composition design is such that C can improve impact toughness, but too high a carbon content is likely to cause defects, so that the mass percentage of C is selected to be 0.15 to 0.25%. Mn can improve the pearlite content and further improve the tensile strength, but when the content is too high, segregation is easy to generate, the ductile-brittle transition temperature is obviously improved, and the plasticity and toughness of the alloy are reduced, so that the mass percentage of Mn is controlled to be 2-2.5%. Si has the characteristic of strongly inhibiting carbide precipitation in the bainite transformation process, stabilizes and refines austenite, increases C, mn segregation, improves the hardenability of the alloy, and can fully improve the hardenability and the impact toughness of the fastener. Ni and B are elements which can increase hardenability, and can fully improve hardenability and impact toughness of the fastener. The small amount of Nb can refine the crystal grains of the alloy, reduce the overheat sensitivity and tempering brittleness of the alloy, and improve the strength and corrosion resistance. The trace amount of B can greatly improve the hardenability of the high alloy, and each 1 part by mass of B corresponds to 300 parts by mass of Mo. The trace V may impart specific functions to the steel such as increasing tensile strength and yield point. The brittleness of the alloy can be obviously reduced by adding a proper amount of Ti and Co. Therefore, the components can be used for manufacturing valves in marine low-temperature high-pressure environments.
Further, the manufacturing method of the high-strength low-temperature-resistant corrosion-resistant valve body 1 comprises the following steps: preparing a raw material for manufacturing the valve body 1, obtaining element types in the raw material through a spectrum analyzer, and obtaining the density of each element through a density detector so as to obtain the mass percent of each element; adding auxiliary materials according to the mass percentages of the elements, and ensuring that the mass percentages of the elements in the raw materials for manufacturing the valve body 1 reach the required standard; putting raw materials for manufacturing the valve body 1 into smelting equipment to be smelted into molten steel, controlling the temperature at 1550-1680 ℃ and keeping for 1h; slag is formed by using a slag forming agent, and bottom blowing gas is blown into smelting equipment through a furnace bottom nozzle; stirring molten steel; transferring the molten steel subjected to primary smelting into a vacuum or inert gas-filled container for deoxidation, degassing and desulfurization, removing impurities contained in the molten steel, and obtaining the percentage of the impurities through a spectrum analyzer and a density detector; repeating the previous step until the percentage of inclusions in the molten steel is not obviously reduced or the percentage of inclusions in the molten steel is minimized; heating molten steel to 1700-1850 ℃, discharging and sedating; after calming for 2-3min, pouring molten steel into a mould to form a valve body 1 part; placing the cast valve body 1 part into an electric furnace, heating to 870-970 ℃ at a speed of not higher than 75 ℃/h, preserving heat for 4-5h, and cooling the furnace to room temperature; heating to 750-820 ℃ at a speed of not higher than 92 ℃/h, preserving heat for 3-4h, discharging from the furnace, and quenching in water at 65-80 ℃ to 300-375 ℃; heating to 385-420 ℃ in an electric furnace, performing low-temperature tempering treatment, preserving heat for 5 hours, discharging and air cooling; heating the valve body 1 part to 920-955 ℃, preserving heat for 4-5h, cooling to 650-750 ℃ at the speed of 65-75 ℃/h, discharging and air cooling; degreasing, airing, cleaning, draining and coating film by using polyvinylidene fluoride on the inner surface of the valve body 1 after annealing and air cooling; and (3) placing the treated valve body 1 part into a container at 75-80 ℃ for drying, and preserving heat for 1-1.5h.
In the embodiment, according to the steps and the raw material proportion of the valve body 1 provided by the invention, the brittleness of the cast valve body 1 can be greatly reduced, and the strength of the valve body 1 in a marine low-temperature environment is improved; the corrosion resistance of the valve body 1 is obviously improved; and polyvinylidene fluoride is used for coating the inner surface of the valve body 1, so that the valve body 1 has excellent flexibility and impact resistance, and can resist frequent and complex ocean current movement in the ocean.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A low temperature resistant corrosion-resistant high strength valve for deep sea which characterized in that: the high-pressure-resistant valve comprises a valve body (1), wherein two pipelines (2) communicated with an inlet end and an outlet end are arranged in the valve body (1), a valve core (3) used for controlling on-off is arranged between the two pipelines (2), the pipelines (2) are arranged to be of a telescopic expansion structure, two ends of the pipeline are fixed with the inner wall of the valve body (1) through flexible sleeves (4), and the pipelines (2) are formed by annular intervals of adjacent large arc sheets (21) and small arc sheets (22) which are arranged in an inserted mode and are used for adapting to different pressure conditions in deep sea and guaranteeing internal circulation; the valve body (1) consists of ：C：0.15-0.25％,Si：3-3.5％,Mn：2-2.5％,Nb：0.2-0.3％,Ti：0.17-0.22％,Co：0.25-0.35％,Ni：0.05-0.1％,Al：0.1-0.15％,Zn：0.15-0.2％,Cr：1.2-1.8％,B：0.005-0.008％,V：0.05-0.1％,Sn：0.015-0.025％,S≤0.025％,P≤0.03％, parts by mass and the balance of Fe.
2. A low temperature and corrosion resistant high strength valve for deep sea according to claim 1, wherein: the two sides of the small arc piece (22) slide in the large arc piece (21), the small arc piece (22) is connected with the inner wall of the inner cavity of the large arc piece (21) through a flexible belt (23), and the whole shape of the flexible sleeve (4) is horn-shaped and is in a corrugated shape.
3. A low temperature and corrosion resistant high strength valve for deep sea according to claim 1, wherein: the outer wall of the valve body (1) is provided with three layers of anti-corrosion coatings from outside to inside, the outermost layer is an anti-corrosion layer (11), the secondary outer layer is an anti-aging layer (12), the innermost layer is a low-temperature layer (13), the low-temperature layer (13) is made of polybutadiene materials, the anti-aging layer (12) is made of polytetrafluoroethylene materials, and the anti-corrosion layer (11) is made of fluororubber materials.
4. A low temperature and corrosion resistant high strength valve for deep sea according to claim 1, wherein: the upper end of the valve body (1) is provided with a miniature turbine (5) for supplying power to the rotation of the valve core (3), a heating module is arranged in the valve core (3), and the heating module is also powered by the turbine.
5. A method for manufacturing a low temperature and corrosion resistant high strength valve for deep sea, which uses the technical features of any one of claims 1 to 4, characterized in that: the method comprises the following steps: step S1, assembling a valve body (1) and a valve core (3) from top to bottom according to the steps of from inside to outside; s2, performing pressure and air tightness test on the assembled valve; step S3, if the valve meets the pressure and air tightness requirements, painting and packaging are carried out; if the pressure and air tightness requirements are not met, reworking is carried out; wherein the manufacture of the valve body (1) comprises the following steps: step one, proportioning raw materials; smelting raw materials; step three, pouring the valve body (1); fourthly, heat treatment; fifthly, treating the inner surface of the valve body (1); step six, drying for standby.
6. The method for manufacturing the low-temperature-resistant corrosion-resistant high-strength valve for the deep sea according to claim 5, wherein the method comprises the following steps: step one: preparing a raw material for manufacturing the valve body (1), obtaining element types in the raw material through a spectrum analyzer, obtaining the density of each element through a density detector, and further obtaining the mass percent of each element; adding auxiliary materials according to the mass percentage of each element; step two: smelting raw materials for manufacturing the valve body (1) into molten steel in smelting equipment, controlling the temperature at 1550-1680 ℃ and keeping for 1h; slag is formed by using a slag forming agent, and bottom blowing gas is blown into smelting equipment through a furnace bottom nozzle; stirring molten steel; transferring the molten steel subjected to primary smelting into a vacuum or inert gas-filled container for deoxidation, degassing and desulfurization, removing impurities contained in the molten steel, and obtaining the percentage of the impurities through a spectrum analyzer and a density detector; the primary refining step is repeated until the percentage of inclusions contained in the molten steel has not been significantly reduced or has been minimized.
7. The method for manufacturing the low-temperature-resistant corrosion-resistant high-strength valve for the deep sea according to claim 6, wherein the method comprises the following steps: step three, heating the molten steel to 1700-1850 ℃, discharging and sedating; after calming for 2-3min, pouring molten steel into a mould to form a valve body (1) part; the slag former in the third step is a low-carbon submerged arc slag former, and comprises the following components in percentage: caO:68-72%, siO 2：5-10％,MgO：1-3％,Al2O3: 7-14%, al:4-5%, S:0.005-0.01%; the bottom blowing gas is Ar, N 2、CO2 or CH 4; step four: placing the cast valve body (1) part into an electric furnace, heating to 870-970 ℃ at a speed of not higher than 75 ℃/h, preserving heat for 4-5h, and cooling the furnace to room temperature; heating to 750-820 ℃ at a speed of not higher than 92 ℃/h, preserving heat for 3-4h, discharging from the furnace, and quenching in water at 65-80 ℃ to 300-375 ℃; heating to 385-420 ℃ in an electric furnace, performing low-temperature tempering treatment, preserving heat for 5 hours, discharging and air cooling; annealing: heating the valve body (1) to 920-955 ℃, preserving heat for 4-5h, cooling to 650-750 ℃ at the speed of 65-75 ℃/h, discharging and air cooling.
8. The method for manufacturing the low-temperature-resistant corrosion-resistant high-strength valve for the deep sea according to claim 7, wherein the method comprises the following steps: step five: degreasing, airing, cleaning, draining and coating film by using polyvinylidene fluoride on the inner surface of the valve body (1) after annealing and air cooling; step six: and (3) placing the treated valve body (1) part into a container at 75-80 ℃ for drying, and preserving heat for 1-1.5h.
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