CN112359295A - Corrosion-resistant stainless steel pipe for ship - Google Patents
Corrosion-resistant stainless steel pipe for ship Download PDFInfo
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- CN112359295A CN112359295A CN202011157889.6A CN202011157889A CN112359295A CN 112359295 A CN112359295 A CN 112359295A CN 202011157889 A CN202011157889 A CN 202011157889A CN 112359295 A CN112359295 A CN 112359295A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to an anti-corrosion stainless steel pipe for ships, which comprises an anti-corrosion stainless steel pipe and an anti-corrosion coating applied to the surface of the anti-corrosion stainless steel pipe, wherein the anti-corrosion stainless steel pipe comprises the following elements in percentage by mass: chromium Cr; nickel Ni; titanium (Ti); niobium Nb; molybdenum Mo; silicon Si; carbon C; s, sulfur; and N is nitrogen. The invention can effectively avoid electrochemical corrosion by chromium element; the coating formed by drying and curing the anticorrosive paint on the surface of the stainless steel pipe prevents corrosive medium from existing on the surface of the stainless steel pipe, prevents water, oxygen and ions from permeating a paint film, plays a compact protection role on the stainless steel pipe, and can effectively improve the corrosion resistance and oxidation resistance of the stainless steel pipe.
Description
Technical Field
The invention relates to the technical field of stainless steel pipes, in particular to an anti-corrosion stainless steel pipe for a ship and a preparation method thereof.
Background
In general, stainless steel pipes used in ships are exposed to an environment having a high water content for a long time and are likely to cause corrosion, and thus, stainless steel pipes for ships are required to have high corrosion resistance. In view of this, we propose an anti-corrosive stainless steel pipe for ships and a method for preparing the same.
Disclosure of Invention
In order to make up for the defects, the invention provides an anti-corrosion stainless steel pipe for a ship and a preparation method thereof.
The technical scheme of the invention is as follows:
the marine corrosion-resistant stainless steel pipe comprises a corrosion-resistant stainless steel pipe and a corrosion-resistant coating coated on the surface of the corrosion-resistant stainless steel pipe, wherein the corrosion-resistant stainless steel pipe comprises the following elements in percentage by mass:
chromium Cr: 14% -20%;
nickel Ni: 10% -20%;
titanium Ti: 0.1 to 0.3 percent;
niobium Nb: 0.1 to 0.3 percent;
molybdenum Mo: 1.5% -4.0%;
silicon Si: 0.8 to 1.0 percent;
c, carbon C: 0.03% -0.1%;
s, sulfur: 0.015 to 0.04 percent
N: 0.01 to 0.3 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
As a preferable technical scheme of the invention, the anti-corrosion coating adopts one of alcohol-soluble phenolic resin, modified phenolic resin, pure phenolic resin or polyurea elastic coating.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
As a preferred technical scheme of the present invention, the ingredients in S1 are specifically operated as follows: and mixing the components according to the mass percentage of the above element components.
As a preferred technical scheme of the present invention, the smelting in S2 specifically comprises: the pre-prepared ingredients are put into a smelting furnace for melting, the melt is obtained by rapidly heating after the ingredients are melted, the mixture is stirred until the melt is uniform, and the temperature is controlled to be 1680-.
As a preferred technical scheme of the invention, the specific operations of deoxidizing and deslagging in S3 are as follows: and (3) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming a precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
As a preferred technical solution of the present invention, the casting and molding in S4 specifically comprises: pouring the molten steel obtained in the step S3 into a casting mold for casting.
As a preferred embodiment of the present invention, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 500-650 ℃, and the heating time is 2-2.5 hours.
As a preferred technical solution of the present invention, the heat treatment in S6 specifically includes: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to carry out solid solution treatment on the steel billet which is cast and formed for 0.5 to 1.0 hour at the temperature of 1000-2000 ℃, and then naturally cool the steel billet to room temperature; the aging treatment is specifically carried out by standing for 1.5-3 hours at the temperature of 450-470 ℃.
As a preferred technical scheme of the invention, the preparation and spraying of the anticorrosive paint in S7 comprises the following specific operations: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 65-70 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours, then the transverse spraying is carried out until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished; the specific operation of drying and curing the anticorrosive coating in the step S8 is as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can improve the electrode potential of the stainless steel through the chromium element, effectively avoid electrochemical corrosion, and the iron-chromium alloy steel is easy to form a layer of compact passive film in an oxidizing medium, the layer of the passive film is stable and complete, the combination with the base metal is firm, and the base body is completely separated from the medium, thereby effectively preventing the steel from being further oxidized or corroded;
2. the corrosion resistance and the high-temperature oxidation resistance of the chromium steel can be obviously improved through the nickel;
3. according to the invention, titanium and niobium are added, the affinity of titanium and niobium with carbon is greater than that of chromium, and after the titanium and niobium are added into steel, carbon is preferentially combined with the titanium and niobium to generate titanium carbide and niobium carbide, so that the phenomenon that chromium carbide is precipitated to cause poor chromium at a crystal boundary can be avoided, and intercrystalline corrosion is effectively prevented;
4. the addition of the silicon body has good effect on improving the oxidation resistance and heat strength of the stainless steel; sulfur can improve the cutting performance of stainless steel;
5. according to the invention, the molybdenum can promote the surface passivation of the stainless steel, so that the corrosion resistance and crevice corrosion resistance of the stainless steel in a non-oxidizing acid environment containing chloride ions can be effectively enhanced;
6. according to the invention, the coating formed by drying and curing the anticorrosive paint on the surface of the stainless steel pipe prevents corrosive medium from existing on the surface of the stainless steel pipe, prevents water, oxygen and ions from permeating a paint film, plays a compact protection role on the stainless steel pipe, and can effectively improve the corrosion resistance and oxidation resistance of the stainless steel pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.
Example 1
The embodiment provides an anti-corrosion stainless steel pipe for ships, which comprises an anti-corrosion stainless steel pipe and an anti-corrosion coating applied to the surface of the anti-corrosion stainless steel pipe, wherein the anti-corrosion stainless steel pipe comprises the following elements in percentage by mass:
chromium Cr: 14 percent;
nickel Ni: 10 percent;
titanium Ti: 0.1 percent;
niobium Nb: 0.1 percent;
molybdenum Mo: 1.5 percent;
silicon Si: 0.8 percent;
c, carbon C: 0.03 percent;
s, sulfur: 0.015 percent;
n: 0.01 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
In this embodiment, the anticorrosive coating is one of an alcohol-soluble phenolic resin, a modified phenolic resin, a pure phenolic resin, or a polyurea elastic coating.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
In this embodiment, the specific operations of the ingredients in S1 are as follows: and mixing the components according to the mass percentage of the above element components.
In this embodiment, the smelting in S2 specifically includes: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature to be 1680 ℃ in the smelting process.
In this embodiment, the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
In this embodiment, the casting and molding in S4 specifically includes: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
In this embodiment, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to relax the interior of the metal, and slowly cooling the steel blank, wherein the heating temperature for annealing and forging is 500 ℃ and the heating time is 2 hours.
In this embodiment, the specific operations of the heat treatment in S6 are as follows: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to perform solid solution treatment on a cast billet for 0.5 hour at the temperature of 1000 ℃, and then naturally cool the billet to room temperature; the aging treatment was carried out specifically by allowing the mixture to stand at 450 ℃ for 1.5 hours.
In this embodiment, the specific operations of preparing and spraying the anticorrosive paint in S7 are as follows: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the air temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 65 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished once, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours, then the transverse spraying is carried out until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished.
In this embodiment, the specific operations of drying and curing the anticorrosive coating in S8 are as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
Example 2
The embodiment provides an anti-corrosion stainless steel pipe for ships, which comprises an anti-corrosion stainless steel pipe and an anti-corrosion coating applied to the surface of the anti-corrosion stainless steel pipe, wherein the anti-corrosion stainless steel pipe comprises the following elements in percentage by mass:
chromium Cr: 17 percent;
nickel Ni: 15 percent;
titanium Ti: 0.2 percent;
niobium Nb: 0.2 percent;
molybdenum Mo: 3.0 percent;
silicon Si: 0.9 percent;
c, carbon C: 0.05 percent;
s, sulfur: 0.025 percent;
n: 0.15 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
In this embodiment, the anticorrosive coating is one of an alcohol-soluble phenolic resin, a modified phenolic resin, a pure phenolic resin, or a polyurea elastic coating.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
In this embodiment, the specific operations of the ingredients in S1 are as follows: and mixing the components according to the mass percentage of the above element components.
In this embodiment, the smelting in S2 specifically includes: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature to be 1690 ℃ in the smelting process.
In this embodiment, the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
In this embodiment, the casting and molding in S4 specifically includes: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
In this embodiment, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 600 ℃, and the heating time is 2.25 hours.
In this embodiment, the specific operations of the heat treatment in S6 are as follows: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to perform solid solution treatment on a cast billet for 0.75 hour at the temperature of 1500 ℃, and then naturally cool the billet to room temperature; the aging treatment is specifically carried out by standing for 2.5 hours at the temperature of 450-470 ℃.
In this embodiment, the specific operations of preparing and spraying the anticorrosive paint in S7 are as follows: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the air temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 67.5 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours and then transversely sprayed until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished.
In this embodiment, the specific operations of drying and curing the anticorrosive coating in S8 are as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
Example 3
The embodiment provides an anti-corrosion stainless steel pipe for ships, which comprises an anti-corrosion stainless steel pipe and an anti-corrosion coating applied to the surface of the anti-corrosion stainless steel pipe, wherein the anti-corrosion stainless steel pipe comprises the following elements in percentage by mass:
chromium Cr: 20 percent;
nickel Ni: 20 percent;
titanium Ti: 0.3 percent;
niobium Nb: 0.3 percent;
molybdenum Mo: 4.0 percent;
silicon Si: 1.0 percent;
c, carbon C: 0.08 percent;
s, sulfur: 0.04 percent;
n: 0.3 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
In this embodiment, the anticorrosive coating is one of an alcohol-soluble phenolic resin, a modified phenolic resin, a pure phenolic resin, or a polyurea elastic coating.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
In this embodiment, the specific operations of the ingredients in S1 are as follows: and mixing the components according to the mass percentage of the above element components.
In this embodiment, the smelting in S2 specifically includes: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature at 1700 ℃ in the smelting process.
In this embodiment, the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
In this embodiment, the casting and molding in S4 specifically includes: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
In this embodiment, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 650 ℃, and the heating time is 2.5 hours.
In this embodiment, the specific operations of the heat treatment in S6 are as follows: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to perform solid solution treatment on a cast billet for 1.0 hour at the temperature of 2000 ℃, and then naturally cool the billet to room temperature; the aging treatment was carried out by allowing the mixture to stand at 470 ℃ for 3 hours.
In this embodiment, the specific operations of preparing and spraying the anticorrosive paint in S7 are as follows: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the air temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 70 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished once, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours, then the transverse spraying is carried out until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished.
In this embodiment, the specific operations of drying and curing the anticorrosive coating in S8 are as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
Comparative example 1
The comparative example provides an anti-corrosion stainless steel pipe for a ship, which comprises an anti-corrosion stainless steel pipe and an anti-corrosion coating applied to the surface of the anti-corrosion stainless steel pipe, wherein the anti-corrosion stainless steel pipe comprises the following elements in percentage by mass:
nickel Ni: 15 percent;
titanium Ti: 0.2 percent;
niobium Nb: 0.2 percent;
molybdenum Mo: 3.0 percent;
silicon Si: 0.9 percent;
c, carbon C: 0.04 percent;
s, sulfur: 0.03 percent;
n: 0.2 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
In this embodiment, the anticorrosive coating is one of an alcohol-soluble phenolic resin, a modified phenolic resin, a pure phenolic resin, or a polyurea elastic coating.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
In this embodiment, the specific operations of the ingredients in S1 are as follows: and mixing the components according to the mass percentage of the above element components.
In this embodiment, the smelting in S2 specifically includes: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature to be 1690 ℃ in the smelting process.
In this embodiment, the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
In this embodiment, the casting and molding in S4 specifically includes: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
In this embodiment, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 600 ℃, and the heating time is 2.2 hours.
In this embodiment, the specific operations of the heat treatment in S6 are as follows: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to perform solid solution treatment on a cast billet for 0.7 hour at the temperature of 1500 ℃, and then naturally cool the billet to room temperature; the aging treatment is specifically carried out by standing at 460 ℃ for 2 hours.
In this embodiment, the specific operations of preparing and spraying the anticorrosive paint in S7 are as follows: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the air temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 67 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished once, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours, then the transverse spraying is carried out until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished.
In this embodiment, the specific operations of drying and curing the anticorrosive coating in S8 are as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
Comparative example 2
The comparative example provides an anti-corrosion stainless steel pipe for a ship, which comprises an anti-corrosion stainless steel pipe and an anti-corrosion coating applied to the surface of the anti-corrosion stainless steel pipe, wherein the anti-corrosion stainless steel pipe comprises the following elements in percentage by mass:
chromium Cr: 17 percent;
titanium Ti: 0.2 percent;
niobium Nb: 0.2 percent;
molybdenum Mo: 3.0 percent;
silicon Si: 0.9 percent;
c, carbon C: 0.06 percent;
s, sulfur: 0.025 percent;
n: 0.15 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
In this embodiment, the anticorrosive coating is one of an alcohol-soluble phenolic resin, a modified phenolic resin, a pure phenolic resin, or a polyurea elastic coating.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
In this embodiment, the specific operations of the ingredients in S1 are as follows: and mixing the components according to the mass percentage of the above element components.
In this embodiment, the smelting in S2 specifically includes: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature to be 1690 ℃ in the smelting process.
In this embodiment, the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
In this embodiment, the casting and molding in S4 specifically includes: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
In this embodiment, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 600 ℃, and the heating time is 2.2 hours.
In this embodiment, the specific operations of the heat treatment in S6 are as follows: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to perform solid solution treatment on a cast billet for 0.7 hour at the temperature of 1500 ℃, and then naturally cool the billet to room temperature; the aging treatment is specifically carried out by standing at 460 ℃ for 2 hours.
In this embodiment, the specific operations of preparing and spraying the anticorrosive paint in S7 are as follows: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the air temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 67 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished once, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours, then the transverse spraying is carried out until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished.
In this embodiment, the specific operations of drying and curing the anticorrosive coating in S8 are as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
Comparative example 3
The comparative example provides an anti-corrosion stainless steel pipe for a ship, which comprises an anti-corrosion stainless steel pipe and an anti-corrosion coating applied to the surface of the anti-corrosion stainless steel pipe, wherein the anti-corrosion stainless steel pipe comprises the following elements in percentage by mass:
chromium Cr: 17 percent;
nickel Ni: 15 percent;
silicon Si: 0.9 percent;
c, carbon C: 0.08 percent;
s, sulfur: 0.025 percent;
n: 0.15 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
In this embodiment, the anticorrosive coating is one of an alcohol-soluble phenolic resin, a modified phenolic resin, a pure phenolic resin, or a polyurea elastic coating.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
In this embodiment, the specific operations of the ingredients in S1 are as follows: and mixing the components according to the mass percentage of the above element components.
In this embodiment, the smelting in S2 specifically includes: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature to be 1690 ℃ in the smelting process.
In this embodiment, the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
In this embodiment, the casting and molding in S4 specifically includes: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
In this embodiment, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 600 ℃, and the heating time is 2.25 hours.
In this embodiment, the specific operations of the heat treatment in S6 are as follows: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to perform solid solution treatment on a cast billet for 0.7 hour at the temperature of 1500 ℃, and then naturally cool the billet to room temperature; the aging treatment is specifically carried out by standing at 460 ℃ for 2 hours.
In this embodiment, the specific operations of preparing and spraying the anticorrosive paint in S7 are as follows: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the air temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 67 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished once, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours, then the transverse spraying is carried out until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished.
In this embodiment, the specific operations of drying and curing the anticorrosive coating in S8 are as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
Comparative example 4
The comparative example provides an anti-corrosion stainless steel pipe for a ship, which comprises the following elements in percentage by mass:
chromium Cr: 17 percent;
nickel Ni: 15 percent;
titanium Ti: 0.2 percent;
niobium Nb: 0.2 percent;
molybdenum Mo: 3.0 percent;
silicon Si: 0.9 percent;
c, carbon C: 0.08 percent;
s, sulfur: 0.025 percent;
n: 0.15 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
A preparation method of the anti-corrosion stainless steel pipe for the ship comprises the following steps:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
and S6, heat treatment.
In this embodiment, the specific operations of the ingredients in S1 are as follows: and mixing the components according to the mass percentage of the above element components.
In this embodiment, the smelting in S2 specifically includes: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature to be 1690 ℃ in the smelting process.
In this embodiment, the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
In this embodiment, the casting and molding in S4 specifically includes: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
In this embodiment, the annealing and forging in S5 specifically includes: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 600 ℃, and the heating time is 2.25 hours.
In this embodiment, the specific operations of the heat treatment in S6 are as follows: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to perform solid solution treatment on a cast billet for 0.75 hour at the temperature of 1500 ℃, and then naturally cool the billet to room temperature; the aging treatment is specifically carried out by standing at 460 ℃ for 2 hours.
Experimental tests were performed on the anti-corrosive stainless steel pipes for ships prepared in examples 1 to 3 and the anti-corrosive stainless steel pipe for ships prepared in comparative example 1, respectively, and the experimental data were obtained as follows:
from the above experimental data, it can be seen that the corrosion-resistant stainless steel pipe for ships, to which chromium is added, has a significant corrosion resistance, and therefore, the addition of chromium element is a key to the corrosion resistance.
Experimental tests were performed on the anti-corrosive stainless steel pipes for ships prepared in examples 1 to 3 and the anti-corrosive stainless steel pipe for ships prepared in comparative example 2, respectively, and the experimental data were as follows:
from the experimental data, the corrosion-resistant stainless steel pipe added with nickel for the ship has certain corrosion resistance, but the corrosion resistance is relatively poorer than that of the chromium element, so that the addition of the nickel element has an auxiliary effect on the corrosion resistance, and the nickel element can play a certain antioxidation effect.
Experimental tests were performed on the anti-corrosive stainless steel pipes for ships prepared in examples 1 to 3 and the anti-corrosive stainless steel pipe for ships prepared in comparative example 3, respectively, and the experimental data were obtained as follows:
from the experimental data, the anti-corrosion marine stainless steel pipe added with titanium, niobium and molybdenum has certain anti-corrosion performance, but the anti-corrosion performance is relatively poor compared with the chromium element, so the addition of the titanium, niobium and molybdenum elements has an auxiliary effect on the anti-corrosion performance.
Experimental tests were performed on the anti-corrosive stainless steel pipes for ships prepared in examples 1 to 3 and the anti-corrosive stainless steel pipe for ships prepared in comparative example 4, respectively, and the experimental data were obtained as follows:
from the above experimental data, it can be seen that the anti-corrosion marine stainless steel pipe coated with the anti-corrosion coating has significant oxidation resistance, and thus the anti-oxidation performance is crucial to the coating of the anti-corrosion coating.
In conclusion, compared with the traditional stainless steel pipe for the ship and the corresponding preparation method, the anti-corrosion stainless steel pipe for the ship and the preparation method thereof provided by the invention have obvious advantages in corrosion resistance and oxidation resistance.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a marine stainless steel pipe of anticorrosion which characterized in that: the corrosion-resistant stainless steel pipe comprises a corrosion-resistant stainless steel pipe and a corrosion-resistant coating smeared on the surface of the corrosion-resistant stainless steel pipe, wherein the corrosion-resistant stainless steel pipe comprises the following elements in percentage by mass:
chromium Cr: 14% -20%;
nickel Ni: 10% -20%;
titanium Ti: 0.1 to 0.3 percent;
niobium Nb: 0.1 to 0.3 percent;
molybdenum Mo: 1.5% -4.0%;
silicon Si: 0.8 to 1.0 percent;
c, carbon C: 0.03% -0.1%;
s, sulfur: 0.015% -0.04%;
n: 0.01 to 0.3 percent.
The balance being Fe and other unavoidable impurities, and the sum of the mass percentages of the above elements being 100%.
2. The anti-corrosive stainless steel pipe for ships according to claim 1, characterized in that: the anti-corrosion coating is made of one of alcohol-soluble phenolic resin, modified phenolic resin, pure phenolic resin or polyurea elastic coating.
3. A method of producing an anti-corrosive stainless steel pipe for ships according to claims 1 to 2, characterized by comprising the steps of:
s1, blending;
s2, smelting;
s3, deoxidizing and deslagging;
s4, casting and forming;
s5, annealing and forging;
s6, heat treatment;
s7, preparing and spraying an anticorrosive paint;
and S8, drying and curing the anticorrosive paint.
4. The method for preparing the anti-corrosion marine stainless steel pipe according to claim 3, wherein the batching in the step S1 is as follows: and mixing the components according to the mass percentage of the above element components.
5. The method for preparing the anti-corrosion marine stainless steel pipe according to claim 3, wherein the smelting in the S2 comprises the following specific operations: putting the prepared ingredients into a smelting furnace for melting, quickly heating the melted ingredients to obtain a melt, stirring the melt until the melt is uniform, and controlling the temperature to be 1680-.
6. The method for preparing an anti-corrosion stainless steel pipe for ships according to claim 3 or 4, wherein the specific operations of deoxidizing and deslagging in S3 are as follows: and (4) directly adding the aluminum blocks into the molten steel obtained in the step (S2), forming precipitate insoluble in the molten steel with oxygen, and filtering and removing the precipitate to obtain the molten steel with low oxygen content.
7. The method for preparing the anti-corrosion marine stainless steel pipe according to claim 5 or 6, wherein the casting and forming in S4 comprises the following specific operations: the molten steel obtained in step S3 is poured into a mold and cast into a shape.
8. The method for preparing the anti-corrosion marine stainless steel pipe according to claim 3, wherein the annealing and forging in the step S5 is performed by the following steps: and slowly heating the steel blank formed by casting to a certain temperature, keeping the temperature for a certain heating time to enable the interior of the metal to relax, and then slowly cooling down, wherein the heating temperature of annealing and forging is 500-650 ℃, and the heating time is 2-2.5 hours.
9. The method for preparing an anti-corrosion stainless steel pipe for ships according to claim 3, wherein the heat treatment in S6 comprises the following specific steps: solid solution treatment and aging treatment, wherein the specific operation of the solid solution treatment is to carry out solid solution treatment on the steel billet which is cast and formed for 0.5 to 1.0 hour at the temperature of 1000-2000 ℃, and then naturally cool the steel billet to room temperature; the aging treatment is specifically carried out by standing for 1.5-3 hours at the temperature of 450-470 ℃.
10. The method for preparing the anti-corrosion marine stainless steel pipe according to claim 3, wherein the anti-corrosion coating preparation and spraying in S7 are carried out by the following specific operations: selecting a polyurea elastic coating as an anticorrosive coating, heating and stirring a polyurea A, B component to form the polyurea elastic coating in an environment with the temperature lower than 15 ℃, wherein the viscosity is less than 1500cps, the coating temperature is kept at 65-70 ℃, the spraying distance is controlled at 40cm during spraying, the steel pipe is longitudinally sprayed until the thickness of the steel pipe is 2cm, the coating is checked after the spraying is finished once, the repairing material is used for leveling the large air holes and the depressions, the repairing material is dried for 2 hours, then the transverse spraying is carried out until the thickness of the steel pipe is 2cm, and the heavy object rolling is avoided within 24 hours after the coating construction is finished; the specific operation of drying and curing the anticorrosive coating in the step S8 is as follows: and (3) placing the steel pipe sprayed with the anticorrosive paint in an oven for drying until the anticorrosive paint on the surface of the steel pipe is completely dried.
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