CN114425682B - Manufacturing method of seamless steel tube for smoke tube - Google Patents

Manufacturing method of seamless steel tube for smoke tube Download PDF

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CN114425682B
CN114425682B CN202111493286.8A CN202111493286A CN114425682B CN 114425682 B CN114425682 B CN 114425682B CN 202111493286 A CN202111493286 A CN 202111493286A CN 114425682 B CN114425682 B CN 114425682B
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steel pipe
temperature
carrying
seamless steel
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CN114425682A (en
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李计珍
沈晨曦
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Jiangsu Xinchangjiang Seamless Steel Pipe Manufacturing Co ltd
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Jiangsu Xinchangjiang Seamless Steel Pipe Manufacturing Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/026—Anodisation with spark discharge
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon

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Abstract

The invention discloses a manufacturing method of a seamless steel tube for a smoke tube, which comprises the following components in percentage by weight: c:0.19-0.23%, si:0.21-0.27%, mn:0.46-0.52%, cr:0.13-0.19%, mo:0.17-0.25%, W:0.11-0.16%, V:0.02-0.07%, ni:0.07-0.11%, and the balance being Fe; adopts a hot continuous rolling process, a two-time quenching and one-time tempering heat treatment process, a hot dip aluminizing and micro-arc oxidation surface treatment process and the like. The invention optimizes the formula of raw steel materials and the manufacturing process of the seamless steel tube, so that the seamless steel tube for the finished smoke tube has higher hardness, mechanical strength, wear resistance and high temperature resistance, and can well resist the impact of high temperature smoke, the corrosion caused by smoke and other factors.

Description

Manufacturing method of seamless steel tube for smoke tube
Technical Field
The invention belongs to the field of manufacturing of seamless steel pipes, and particularly relates to a manufacturing method of a seamless steel pipe for a smoke pipe.
Background
The smoke tube is a part which is used as a convection heating surface on a shell type boiler such as a marine exhaust gas boiler, a fuel oil and exhaust gas combined boiler, a horizontal fuel oil boiler and the like, and generally adopts a seamless steel tube with a high-quality carbon structure, and the smoke tube needs to have the characteristic of good comprehensive mechanical property.
When the high-temperature flue gas enters the flue pipe, the local temperature of the flue pipe is higher, steam, oxygen and carbon dioxide in the flue gas can corrode by using the flue pipe under the action of high temperature, and meanwhile, long-time use can accelerate corrosion due to sediments such as scale formed on the flue pipe, and even fatigue corrosion cracking can be generated under the condition that sufficient cooling is not obtained, so that the flue pipe is required to have good high-temperature oxidation resistance and corrosion resistance. The high temperature flue gas and the fine impurities in the flue gas can wash the surface of the flue pipe, and the surface of the flue pipe is required to be not allowed to have defects such as cracks, folds, pits, scars, separation layers or hairlines, and the like, so that the flue pipe has higher surface hardness, abrasion resistance and good mechanical properties.
However, the existing seamless steel tube production technology for the smoke tube cannot fully meet the performance requirements, and the product often has the problems of insufficient mechanical strength, easiness in abrasion and corrosion or intolerance to high temperature, incapability of resisting high-temperature smoke impact and the like.
Disclosure of Invention
Based on the above circumstances, the invention provides a manufacturing method of a seamless steel tube for a smoke tube, comprising the following steps:
(1) Solid steel pipe raw materials are selected as steel blanks, and the steel blanks comprise the following components in percentage by weight: c:0.19-0.23%, si:0.21-0.27%, mn:0.46-0.52%, cr:0.13-0.19%, mo:0.17-0.25%, W:0.11-0.16%, V:0.02-0.07%, ni:0.07-0.11%, and the balance being Fe; .
(2) Sawing a raw steel pipe, then feeding the raw steel pipe into an annular furnace for heating, discharging after soaking for a certain time, feeding a billet into a perforating section, carrying out rod penetrating operation by using a core rod, feeding the obtained capillary tube in a rolling section of a continuous rolling unit, carrying out continuous rolling, carrying out rod removal, carrying out homogenization by a homogenizer, carrying out temperature compensation again, carrying out scale removal by using high-pressure water, and carrying out reducing sizing to obtain a pierced billet.
(3) And (3) after the discharging in the step (2), the pierced billet advances in a rotating mode, online water quenching is carried out in an inner spraying and outer spraying mode, sawing is carried out on the two ends, then the pierced billet is sent into an induction heating furnace for secondary heating quenching, water cooling is carried out in a rotating mode, and finally tempering, straightening and air cooling are carried out.
(4) And further processing the steel pipe in a finishing operation area, and performing flaw detection operation and manual inspection.
(5) After the steel pipe is subjected to sand blasting, alkali washing, acid washing and flushing, the steel pipe is subjected to hot dip aluminizing after being soaked with a plating assistant agent and dried, and then is subjected to micro-arc oxidation post-treatment. And after the inspection is qualified, obtaining the seamless steel tube for the smoke tube, which is prepared by the method.
Preferably, in step (2): the annular furnace is provided with 6 sections of heating areas, and the temperatures are respectively as follows: 850-950 ℃, 1050-1150 ℃, 1150-1280 ℃, 1210-1280 ℃, 1300-1350 ℃ and 1210-1280 ℃; the penetrating speed of the core rod is 190-240mm/s; the reheating temperature compensation temperature is 980-1100 ℃; the pipe rolling section of the continuous rolling unit is provided with 5-8 groups of rollers, each group is provided with 3 rollers, the rollers are uniformly distributed around the steel pipe in space, and the rotating speed of the rollers is 270-410r/min.
Preferably, the secondary heating quenching temperature of the induction heating furnace in the step (3) is 920-960 ℃, and the temperature is kept for 30-40min; the water cooling time is 15-25s; the tempering temperature is 640-710 ℃, and the temperature is kept for 100-145min.
Preferably, in process 5: the alkaline washing solution is 10-20% sodium hydroxide solution, and alkaline washing is carried out for 15-25min; the pickling solution is 10-15% sulfuric acid solution, and pickling is carried out for 5-10min; the plating assistant agent is 5-10% potassium fluoride solution; 3-8% of Si and 0.5-1% of Fe are added into the hot dip aluminum plating liquid, the temperature is controlled at 700-705 ℃, and the aluminum plating time is 3-5min; the main components of the micro-arc oxidation electrolyte are a compound mixed solution of 7-10g/L sodium silicate, 1.5-2.0g/L sodium metaaluminate and 5-9g/L potassium hydroxide, the micro-arc oxidation temperature is 20-30 ℃, the constant voltage is 280-400V, and the time is 20-30min.
The invention has the beneficial effects that:
1. the steel blank meets the standard of 20 steel for the flue gas pipe, and compared with the traditional 20 steel, mo, ni, W and V are added, and meanwhile, the formula ratio is optimized, so that the steel blank has good hardenability and tempering stability, and the finished product has higher hardness, mechanical strength, wear resistance and high temperature resistance, and can well resist the impact of high-temperature flue gas.
2. The continuous rolling process has the advantages of short process flow, small equipment investment, low energy consumption, high production efficiency and the like.
3. After continuous rolling and reducing sizing and discharging, the temperature of the capillary tube is 900-1000 ℃, and compared with the traditional method, the capillary tube is subjected to air cooling on a cooling bed and then is subjected to normalizing treatment. When quenching is performed again, the induction heating device is adopted, the temperature can be quickly increased, and the steel pipe structure can be subjected to full phase change by twice quenching and once tempering, so that the steel pipe structure has good hardenability, and the toughness, particularly the yield strength, of the steel pipe structure is greatly improved.
4. The Fe-Al alloy layer formed by hot dip aluminum plating ensures that the steel pipe has good high-temperature oxidation resistance, and micro-arc oxidation forms a compact passivation film, so that the corrosion resistance of the smoke pipe can be further improved.
Detailed Description
The present invention will be further described with reference to comparative examples and examples in the following, with reference to a specific method for producing a seamless steel pipe for a low-medium pressure boiler flue pipe.
Comparative example:
the method is characterized in that common 20 # low carbon steel is selected to produce a seamless steel pipe with the specification of phi 195mm multiplied by 8.0mm, and the seamless steel pipe is manufactured according to the traditional manufacturing process of the seamless steel pipe: blanking, heating, perforating, pipe rolling, rod removing, reheating, reducing sizing, cooling by a cooling bed, sawing, normalizing and tempering, straightening, cooling, finishing, flaw detection, inspection, surface treatment and coating with high-temperature paint. The properties of the finished product are shown in Table 1.
Example 1:
the weight percentage of the main components is as follows: c:0.20%, si:0.23%, mn:0.49%, cr:0.15%, mo:0.19%, W:0.12%, V:0.04%, ni:0.08 percent of solid steel pipes with the rest of Fe are taken as raw materials, after being checked to be qualified, the raw material steel pipes are sawed and cut into pieces, the pieces are sent into an annular furnace to be heated, after being heated for a certain time by 6 sections of heating areas at 850 ℃, 1200 ℃, 1250 ℃, 1310 ℃ and 1250 ℃, billets are sent into a perforating section to be subjected to rod penetrating operation by a mandrel with the diameter of 184mm, the main component of the lubricant is crystalline graphite powder, the rod penetrating speed is set at 205mm/s, the obtained raw pipes are fed into a rolling section of a continuous rolling mill, the raw pipes are continuously rolled at the speed of 310r/min by 8-frame hot continuous rolling mill units with 3 rollers, the raw pipes with the outer diameter of 216mm and the wall thickness of 10.4mm are obtained after rod removal by a balancing machine, the raw pipes are heated to 1020 ℃ again to be subjected to temperature compensation by a balancing machine, after the hot water is removed, the raw pipes are subjected to reducing sizing by a 26 three-roll micro-tension reducing mill and a 14-roll sizing mill according to the production specification, after sizing, the raw pipes are sent into a rotary mode, the raw pipes are subjected to on-line quenching water quenching in an inner spraying mode, two-roll induction mode, the raw pipes are heated to be subjected to intermediate frequency induction rolling at the temperature of each end of each group of 3 rolls, the raw pipes are heated to be subjected to heat preservation and cooled at the temperature of 670 ℃ for 20min, and heat preservation for 20 minutes, and tempering is performed after the temperature preservation, and heat preservation is performed for 20 minutes. And further processing the steel pipe in a finishing operation area, and performing flaw detection operation and manual inspection. And (3) performing sand blasting surface treatment on the steel pipe, performing alkaline washing for 20min by using a 20% sodium hydroxide solution, performing acid washing for 5min by using a 10% sulfuric acid solution, washing clean by using clear water, immersing in a 7% potassium fluoride solution tank for 5min, taking out, drying, performing hot dip aluminum plating, taking out after immersing in an aluminum plating pot in which aluminum liquid containing 5% Si and 0.7% Fe is dissolved for 3min, controlling the temperature to be 705 ℃ by an aluminum plating furnace, drying the inner and outer surfaces of the aluminum plated steel pipe at the deviation of not more than 5 ℃, and performing water cooling. The steel pipe is used as a cathode, the aluminum magnesium alloy is used as an anode, micro-arc oxidation post-treatment is carried out in a compound mixed electrolyte with the main components of 9g/L sodium silicate, 1.7g/L sodium metaaluminate and 6g/L potassium hydroxide, the micro-arc oxygen temperature is 25 ℃, the constant voltage is 290V, and the treatment is carried out for 25 minutes to obtain the seamless steel pipe for the low-medium pressure boiler smoke pipe, which is manufactured by the method, and the specification is phi 195mm multiplied by 8.0mm.
Example 2:
the weight percentage of the main components is as follows: c:0.21%, si:0.21%, mn:0.47%, cr:0.14%, mo:0.18%, W:0.11%, V:0.02%, ni:0.09 percent of solid steel pipes with the rest of Fe are taken as raw materials, after being inspected to be qualified, the raw material steel pipes are sawed and cut into pieces, the pieces are sent into an annular furnace to be heated, after being soaked for a certain time, the pieces are sent into a heating zone of 6 sections of 890 ℃, 1220 ℃, 1320 ℃ and 1240 ℃, the pieces are sent out of the furnace, a billet is sent into a perforating section to be subjected to rod penetrating operation by a mandrel, the diameter of the mandrel is 184mm, the main component of the lubricant is crystalline graphite powder, the rod penetrating speed is set at 195mm/s, the obtained raw pipes are fed into a rolling section of a continuous rolling mill, the raw pipes are continuously rolled by a 6-frame hot continuous rolling mill with 3 rollers in each group at a speed of 290r/min, the raw pipes are subjected to uniform by a balancing machine to obtain a raw pipe with an outer diameter of 216mm and a wall thickness of 10.4mm, the raw pipes are heated to 1000 ℃ again to be subjected to temperature compensation by a high-pressure water descaling mode, after the raw pipes are subjected to diameter reduction sizing by a 26 three-roll micro-tension reducing mill and a 14-roll sizing mill, after the sizing, the raw pipes are sent into a rotary mode, the raw pipes are subjected to on-line quenching mode by an inner spraying external spraying mode, the two-side induction mode is adopted, the raw pipes are heated to be subjected to intermediate frequency induction sawing mode, the raw pipes are heated to be subjected to heat preservation and cooled for 15min, heat preservation and tempering is performed for 15min, after the raw pipes are heated for 15min, and heat preservation and quenching mode are performed. And further processing the steel pipe in a finishing operation area, and performing flaw detection operation and manual inspection. And (3) performing sand blasting surface treatment on the steel pipe, performing alkali washing for 25min by using a 10% sodium hydroxide solution, performing acid washing for 5min by using a 15% sulfuric acid solution, washing clean by using clear water, immersing in a 5% potassium fluoride solution tank for 5min, taking out, drying, performing hot dip aluminum plating, taking out after immersing in an aluminum plating pot in which aluminum liquid containing 4% Si and 0.9% Fe is dissolved for 4min, controlling the temperature to 702 ℃ by an aluminum plating furnace, drying the inner and outer surfaces of the aluminum plated steel pipe at the deviation of not more than 5 ℃, and performing water cooling. The steel pipe is used as a cathode, the aluminum magnesium alloy is used as an anode, micro-arc oxidation post-treatment is carried out in a compound mixed electrolyte with the main components of 7g/L sodium silicate, 1.9g/L sodium metaaluminate and 8g/L potassium hydroxide, the micro-arc oxygen temperature is 22 ℃, the constant voltage is 320V, and the treatment is carried out for 20 minutes, so that the seamless steel pipe for the low-medium pressure boiler smoke pipe, which is manufactured by the method, is qualified, and has the specification of phi 195mm multiplied by 8.0mm.
Example 3:
the weight percentage of the main components is as follows: c:0.23%, si:0.26%, mn:0.51%, cr:0.18%, mo:0.23%, W:0.15%, V:0.06%, ni:0.11 percent of solid steel pipes with the rest of Fe are taken as raw materials, after being checked to be qualified, the raw material steel pipes are sawed and cut, the raw material steel pipes are sent into an annular furnace for heating, the steel pipes are sent into a 6-section heating zone with the temperature of 930 ℃, 1150 ℃, 1240 ℃, 1270 ℃, 1340 ℃ and 1270 ℃ for a certain period of time, the steel billets are sent into a punching section for rod penetrating operation by using a core rod with the diameter of 184mm, the main component of the lubricant is flake graphite powder, the rod penetrating speed is set at 230mm/s, the obtained raw pipes are fed into a rolling section of a continuous rolling unit, the raw pipes are continuously rolled at the speed of 370r/min by a 7-frame hot continuous rolling unit with 3 rollers in each group, and (3) after removing the bars, carrying out leveling by a leveling machine to obtain a pierced billet with the outer diameter of 216mm and the wall thickness of 10.4mm, heating to 1050 ℃ again for temperature compensation, carrying out reducing sizing by 26 three-roll micro-tension reducing mills and 14 three-roll sizing mills according to production specifications after descaling by high-pressure water, carrying out sizing discharge, advancing the pierced billet in a rotating mode, carrying out online water quenching by adopting an inner spraying and outer spraying mode, sawing two ends, carrying out secondary heating to 950 ℃ for quenching by a medium-frequency induction heating furnace, carrying out rapid water cooling in a rotating mode for 23s after heat preservation for 35min, finally tempering at 694 ℃, carrying out heat preservation for 135min, and carrying out straightening and air cooling. And further processing the steel pipe in a finishing operation area, and performing flaw detection operation and manual inspection. And (3) performing sand blasting surface treatment on the steel pipe, performing alkaline washing for 15min by using 15% sodium hydroxide solution, performing acid washing for 10min by using 10% sulfuric acid solution, washing clean by using clear water, immersing in an 8% potassium fluoride solution tank for 5min, taking out, drying, performing hot dip aluminum plating, taking out after immersing in an aluminum plating pot in which an aluminum solution containing 7% of Si and 0.6% of Fe is dissolved for 5min, controlling the temperature to be 700 ℃ by an aluminum plating furnace, drying the inner and outer surfaces of the aluminum plated steel pipe at the deviation of not more than 5 ℃, and performing water cooling. The steel pipe is used as a cathode, the aluminum magnesium alloy is used as an anode, micro-arc oxidation post-treatment is carried out in a compound mixed electrolyte with main components of 10g/L sodium silicate, 1.5g/L sodium metaaluminate and 5g/L potassium hydroxide, the micro-arc oxygen temperature is 27 ℃, the constant voltage is 295V, and the treatment is carried out for 28min to check and pass the inspection, so that the seamless steel pipe for the low-medium pressure boiler smoke pipe, which is manufactured by the method, is manufactured according to the invention, and the specification is phi 195mm multiplied by 8.0mm.
The flexibility of each meter of the smoke tube obtained by each embodiment is smaller than 0.8mm/m, and each performance of the smoke tube is shown in the following table 1, and each index in GB3087-2008 is met.
The seamless steel pipes produced in comparative examples and examples 1 to 3 were tested under the following conditions:
wear test conditions: the disk rotation speed was set at 400r/min and the maximum torque was set at 14 N.m in the abrasion tester for 15min.
The hydraulic pressure maintaining test mode comprises the following steps: stopping the pressure increase when the water pressure is increased to 5MPa, checking whether water leakage or abnormal phenomenon exists, then increasing to 15MPa and keeping for 30 minutes, and checking whether water leakage exists or whether water drops exist on the surface of the seamless steel tube or whether residual deformation exists during pressure maintaining.
High temperature yield strength test conditions: the test was carried out with a tester at 500℃for 4 hours.
High-temperature salt spray test mode: taking part of the steel pipe as a sample, continuously spraying the sample on a salt spray tester platform at the test temperature of 80 ℃ in a test box with the spraying amount of 2ml/h, and observing the corrosion condition of the steel pipe sample after 120 hours. The test conditions are shown in Table 1.
Table 1:
as is clear from Table 1 above, the overall properties of examples 1-3 are far superior to those of comparative example 1, and all have good mechanical strength, surface hardness, high temperature resistance and corrosion resistance, especially example 1, which is the best of the properties.

Claims (4)

1. The manufacturing method of the seamless steel tube for the smoke tube is characterized by comprising the following steps of:
(1) Solid steel pipe raw materials are selected as steel blanks, and the steel blanks comprise the following components in percentage by weight: c:0.19-0.23%, si:0.21-0.27%, mn:0.46-0.52%, cr:0.13-0.19%, mo:0.17-0.25%, W:0.11-0.16%, V:0.02-0.07%, ni:0.07-0.11%, and the balance being Fe;
(2) Sawing a raw material steel pipe, then sending the raw material steel pipe into an annular furnace for heating, taking the steel pipe out of the furnace after soaking for a certain time, sending a billet into a perforating section, carrying out rod penetrating operation by using a core rod, feeding the obtained capillary in a rolling section of a continuous rolling unit, carrying out continuous rolling, carrying out rod removing, carrying out homogenization by a homogenizer, carrying out temperature compensation again, carrying out scale removal by using high-pressure water, and carrying out reducing sizing to obtain a pierced billet;
(3) The pierced billet advances in a rotating way, online water quenching is carried out in an internal spraying and external spraying way, sawing is carried out at two ends, then the pierced billet is sent into an induction heating furnace for secondary heating quenching, water cooling is carried out in a rotating way, and finally tempering, straightening and air cooling are carried out;
(4) Further processing the steel pipe in a finishing operation area, and performing flaw detection operation and manual inspection;
(5) After the steel pipe is subjected to sand blasting, alkali washing, acid washing and flushing, the steel pipe is subjected to hot dip aluminizing after being soaked with a plating assistant agent and dried, and then is subjected to micro-arc oxidation post-treatment.
2. The method for producing a seamless steel pipe for a smoke tube according to claim 1, wherein in step (2): the annular furnace is provided with 6 sections of heating areas, and the temperatures are respectively as follows: 850-950 ℃, 1050-1150 ℃, 1150-1280 ℃, 1210-1280 ℃, 1300-1350 ℃ and 1210-1280 ℃; the penetrating speed of the core rod is 190-240mm/s; the reheating temperature compensation temperature is 980-1100 ℃; the pipe rolling section of the continuous rolling unit is provided with 5-8 groups of rollers, each group is provided with 3 rollers, the rollers are uniformly distributed around the steel pipe in space, and the rotating speed of the rollers is 270-410r/min.
3. The method for producing a seamless steel pipe for a smoke tube according to claim 1, wherein in step (3): the secondary heating and quenching temperature of the induction heating furnace is 920-960 ℃, and the temperature is kept for 30-40min; the water cooling time is 15-25s; the tempering temperature is 640-710 ℃, and the temperature is kept for 100-145min.
4. The method for producing a seamless steel pipe for a smoke tube according to claim 1, wherein in step (5): the alkaline washing solution is 10-20% sodium hydroxide solution, and alkaline washing is carried out for 15-25min; the pickling solution is 10-15% sulfuric acid solution, and pickling is carried out for 5-10min; the plating assistant agent is 5-10% potassium fluoride solution; 3-8% of Si and 0.5-1% of Fe are added into the hot dip aluminum plating liquid, the temperature is controlled at 700-705 ℃, and the aluminum plating time is 3-5min; the main components of the micro-arc oxidation electrolyte are a compound mixed solution of 7-10g/L sodium silicate, 1.5-2.0g/L sodium metaaluminate and 5-9g/L potassium hydroxide, the micro-arc oxidation temperature is 20-30 ℃, the constant voltage is 280-400V, and the time is 20-30min.
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