CN114425682A - Manufacturing method of seamless steel pipe for smoke pipe - Google Patents
Manufacturing method of seamless steel pipe for smoke pipe Download PDFInfo
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- CN114425682A CN114425682A CN202111493286.8A CN202111493286A CN114425682A CN 114425682 A CN114425682 A CN 114425682A CN 202111493286 A CN202111493286 A CN 202111493286A CN 114425682 A CN114425682 A CN 114425682A
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- steel pipe
- temperature
- smoke
- seamless steel
- manufacturing
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 92
- 239000010959 steel Substances 0.000 title claims abstract description 92
- 239000000779 smoke Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000010791 quenching Methods 0.000 claims abstract description 15
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims abstract description 14
- 230000000171 quenching effect Effects 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 238000007747 plating Methods 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000005406 washing Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 19
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000005269 aluminizing Methods 0.000 claims description 13
- 238000004513 sizing Methods 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 10
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 claims description 5
- 239000011698 potassium fluoride Substances 0.000 claims description 5
- 235000003270 potassium fluoride Nutrition 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000003303 reheating Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000009785 tube rolling Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000004381 surface treatment Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract 1
- 238000004321 preservation Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 229910000680 Aluminized steel Inorganic materials 0.000 description 3
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Electrochemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a method for manufacturing a seamless steel tube for a smoke tube, which selects a billet comprising 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 to 0.07%, Ni: 0.07-0.11% of Fe for the rest; the hot continuous rolling process, the heat treatment process of quenching twice and tempering once, the hot dip aluminum plating process, the micro arc oxidation surface treatment process and the like are adopted. The invention optimizes the formula of the raw material steel material and the manufacturing process of the seamless steel tube, so that the seamless steel tube for the finished product smoke tube has higher hardness, mechanical strength, wear resistance and high temperature resistance, and can better resist the impact of high-temperature smoke, the corrosion caused by factors such as the smoke and the like.
Description
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 used as a convection heating surface on shell-type boilers such as marine exhaust gas boilers, fuel oil and exhaust gas combined boilers, horizontal fuel oil boilers and the like, generally adopts a seamless steel tube with a high-quality carbon structure, and needs to have good comprehensive mechanical property characteristics.
When 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 the flue pipe under the action of high temperature, meanwhile, deposits such as scale and the like formed on the flue pipe can be corroded rapidly after long-time use, and even under the condition that sufficient cooling cannot be obtained, fatigue corrosion cracking can be generated, so that the flue pipe is required to have good high-temperature oxidation resistance and corrosion resistance. The high-temperature flue gas and fine impurities in the flue gas can also wash the surface of the flue pipe, so that the surface of the flue pipe is required to have no defects of cracks, folding, rolling, pits, scabbing, separation layers or hairlines and the like, and the flue pipe has high surface hardness, abrasion resistance and good mechanical performance.
However, the existing production technology of seamless steel tubes for smoke tubes can not meet the performance requirements, and the products of the seamless steel tubes often have the problems of insufficient mechanical strength, easy abrasion and corrosion, no high temperature resistance, no high temperature smoke impact resistance and the like.
Disclosure of Invention
Based on the above situation, the invention provides a manufacturing method of a seamless steel tube for a smoke tube, which comprises the following steps:
(1) selecting a solid steel pipe raw material as a billet, wherein the solid steel pipe raw material 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 to 0.07%, Ni: 0.07-0.11% of Fe for the rest; .
(2) The method comprises the steps of sawing a raw steel pipe, feeding the steel pipe into a ring furnace for heating, soaking for a certain time, discharging the steel pipe out of the furnace, feeding the steel pipe into a punching section, performing bar penetrating operation by using a core rod, feeding the obtained hollow billet into a rolling section of a continuous rolling unit, performing continuous rolling, performing bar peeling, performing leveling by using a leveling machine, performing heating temperature compensation again, descaling by using high-pressure water, and then reducing and sizing to obtain the hollow billet.
(3) And (2) after discharging, advancing the pierced billet in a rotating mode, performing online water quenching in an internal spraying and external spraying mode, sawing the two ends, sending the pierced billet into an induction heating furnace for secondary heating quenching, performing water cooling in a rotating mode, and finally performing tempering, straightening and air cooling.
(4) And further processing the steel pipe in a finishing operation area, and carrying out flaw detection operation and manual inspection.
(5) After sand blasting, alkali washing, acid washing and washing, the steel pipe is hot-dip aluminized after being dipped with plating assistant agent and dried, and then is treated after micro-arc oxidation. After the inspection is qualified, the seamless steel tube for the smoke tube manufactured by the method is obtained.
Preferably, in step (2): the annular furnace is provided with 6 sections of heating zones, and the temperatures are respectively as follows: 850-; the rod penetrating speed of the core rod is 190-240 mm/s; the reheating temperature compensation temperature is 980-1100 ℃; the tube rolling section of the continuous rolling unit comprises 5-8 groups of rollers, each group comprises 3 rollers, the rollers are evenly distributed around the steel tube in space, and the rotating speed of the rollers is 270-410 r/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 30-40 min; the secondary water cooling time is 15-25 s; the tempering temperature is 640-710 ℃, and the temperature is kept for 100-145 min.
Preferably, in process 5: the alkali washing solution is 10-20% of sodium hydroxide solution, and alkali washing is carried out for 15-25 min; the acid washing solution is a 10-15% sulfuric acid solution, and is subjected to acid washing for 5-10 min; 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 aluminizing aluminum liquid, the temperature is controlled at 700-705 ℃, and the aluminizing time is 3-5 min; the micro-arc oxidation electrolyte mainly comprises 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 20-30 min.
The invention has the beneficial effects that:
1. the billet selected by the invention meets the standard of 20 steel for the smoke tube, compared with the traditional 20 steel, Mo, Ni, W and V are added, and the formula ratio is optimized, so that the billet has good through-quenching capability and tempering stability, and the finished product has high hardness, mechanical strength, wear resistance and high temperature resistance and can well resist the impact of high-temperature smoke.
2. The invention adopts the continuous rolling process and has the advantages of short process flow, small equipment investment, low energy consumption, high production efficiency and the like.
3. After the capillary is discharged by continuous rolling and reducing sizing, the temperature is still 900-. When the steel pipe is quenched again, the induction heating device is adopted, the temperature can be rapidly increased, the steel pipe can be fully phase-changed by quenching twice and tempering once, the steel pipe has good hardenability, and the toughness, particularly the yield strength, of the steel pipe is greatly improved.
4. The Fe-Al alloy layer formed by hot dip aluminum plating enables the steel pipe to have good high temperature oxidation resistance, a compact passive film is formed by micro-arc oxidation, and the corrosion resistance of the smoke pipe can be further improved.
Detailed Description
The present invention will be further explained by the following specific method for manufacturing seamless steel pipe for smoke pipe of low and medium pressure boiler in combination with comparative example and examples.
Comparative example:
selecting common No. 20 low-carbon steel to produce seamless steel tubes with the specification of phi 195mm multiplied by 8.0mm, and manufacturing according to the manufacturing process of the traditional seamless steel tube: blanking → heating → perforating → rolling tube → knockout → reheating → reducing sizing → cooling bed air cooling → sawing → normalizing + tempering process → straightening → cooling → finishing, flaw detection, inspection → surface treatment, coating and high temperature paint. The properties of the finished product are shown in Table 1.
Example 1:
the main components are selected according to the weight percentage: 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 pipe with the balance of Fe is taken as raw material, the raw material steel pipe is sawed and blanked after being inspected to be qualified, the steel pipe is sent into a ring furnace to be heated, the steel pipe is heated by 6 sections of heating zones of 850 ℃, 1120 ℃, 1200 ℃, 1250 ℃, 1310 ℃ and 1250 ℃, the steel pipe is taken out of the furnace after being soaked for a certain time, the steel billet is sent into a punching section to be subjected to bar penetrating operation by a mandrel, the diameter of the mandrel is 184mm, the main component of the used lubricant is crystalline flake graphite powder, the bar penetrating speed is set at 205mm/s, the obtained capillary is fed into the rolling section of a continuous rolling unit, the capillary is continuously rolled by an 8-frame hot continuous rolling unit with 3 rollers in each group at the speed of 310r/min, the capillary with the outer diameter of 216mm and the wall thickness of 10.4mm is obtained after bar peeling by a leveling machine, the temperature compensation is carried out by heating again to 1020 ℃, the descaling is carried out by high pressure water, and the diameter reduction and sizing are carried out by a 26-three-roll micro-reduction reducing mill and a 14-sizing mill according to the production specification, after sizing and discharging, advancing the pierced billet in a rotating mode, performing online water quenching in an internal spraying and external spraying mode, sawing two ends, feeding the pierced billet into a medium-frequency induction heating furnace for secondary heating to 940 ℃ for quenching, performing rapid water cooling for 20s in a rotating mode after heat preservation for 30min, finally performing tempering at 670 ℃, performing heat preservation for 120min, and performing straightening and air cooling. And further processing the steel pipe in a finishing operation area, and carrying out flaw detection operation and manual inspection. And (3) performing sand blasting surface treatment on the steel pipe, performing alkali washing for 20min by using a 20% sodium hydroxide solution, performing acid washing for 5min by using a 10% sulfuric acid solution, washing the steel pipe by using clear water, soaking the steel pipe in a 7% potassium fluoride solution tank for 5min, taking out the steel pipe, drying the steel pipe, performing hot dip aluminizing, soaking the steel pipe in an aluminizing pan in which 5% Si and 0.7% Fe are dissolved for 3min, taking out the steel pipe, controlling the temperature to be 705 ℃ through an aluminizing furnace, controlling the deviation to be not more than 5 ℃, and performing water cooling after the inner and outer surfaces of the aluminized steel pipe are dried. The seamless steel pipe for the low and medium pressure boiler smoke pipe prepared by the method is obtained by taking a steel pipe as a cathode and an aluminum-magnesium alloy as an anode, and carrying out micro-arc oxidation post-treatment in a compound mixed electrolyte mainly comprising 9g/L sodium silicate, 1.7g/L sodium metaaluminate and 6g/L potassium hydroxide, wherein the micro-arc oxidation temperature is 25 ℃, the constant voltage is 290V, and the seamless steel pipe for the low and medium pressure boiler smoke pipe is obtained after 25min of treatment and qualified inspection, and the specification is phi 195mm multiplied by 8.0 mm.
Example 2:
the main components are selected according to the weight percentage: 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 pipe with the balance of Fe is taken as a raw material, the raw material steel pipe is sawn and blanked after being inspected to be qualified, the raw material steel pipe is sent into a circular furnace to be heated, the steel pipe is heated by 6 heating zones of 890 ℃, 1130 ℃, 1220 ℃, 1240 ℃, 1320 ℃ and 1240 ℃, the steel pipe is taken out of the furnace after being soaked for a certain time, a billet is sent into a punching section to be subjected to bar penetrating operation by a mandrel, the diameter of the mandrel is 184mm, the main component of the used lubricant is flake graphite powder, the bar penetrating speed is set at 195mm/s, the obtained capillary is fed into the rolling section of a continuous rolling mill set, the capillary is continuously rolled by a 6-frame hot continuous rolling mill set with 3 rollers in each group at the speed of 290r/min, the billet is removed and then is uniformly rolled by a leveling machine to obtain a pierced billet with the outer diameter of 216mm and the wall thickness of 10.4mm, the pierced billet is heated to 1000 ℃ again for temperature compensation, the billet is descaled by a 26-three-roll reducing mill and 14-roll sizing by a three-roll mill according to the production specification after high-pressure water, after sizing and discharging, advancing the pierced billet in a rotating mode, performing online water quenching in an internal spraying and external spraying mode, sawing two ends, feeding the pierced billet into a medium-frequency induction heating furnace for secondary heating to 930 ℃ for quenching, performing rapid water cooling for 15s in a rotating mode after heat preservation for 40min, finally performing tempering at 655 ℃, performing heat preservation for 105min, and performing straightening and air cooling. And further processing the steel pipe in a finishing operation area, and carrying out flaw detection operation and manual inspection. And (3) performing sand blasting surface treatment on the steel pipe, performing alkali washing with 10% sodium hydroxide solution for 25min, performing acid washing with 15% sulfuric acid solution for 5min, washing with clear water, immersing in a 5% potassium fluoride solution tank for 5min, taking out, drying, performing hot dip aluminizing, immersing in an aluminizing pan containing 4% Si and 0.9% Fe for 4min, taking out, controlling the temperature at 702 ℃ through an aluminizing furnace, keeping the deviation not more than 5 ℃, drying the inner surface and the outer surface of the aluminized steel pipe, and performing water cooling. The seamless steel pipe for the low and medium pressure boiler smoke pipe, which is prepared by the method of the invention, is obtained after the steel pipe is used as a cathode, the aluminum-magnesium alloy is used as an anode, and the 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 oxidation temperature is 22 ℃, the constant voltage is 320V, the treatment is carried out for 20min, and the inspection is qualified, wherein the specification is phi 195mm multiplied by 8.0 mm.
Example 3:
the main components are selected according to the weight percentage: 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 pipe with the balance of Fe is taken as raw material, the raw material steel pipe is sawed and blanked after being inspected to be qualified, the steel pipe is sent into a ring furnace to be heated, the steel pipe is heated by a 930 ℃, 1150 ℃, 1240 ℃, 1270 ℃, 1340 ℃ and 1270 ℃ 6 sections, the steel pipe is taken out of the furnace after being soaked for a certain time, the steel billet is sent into a punching section to be punched by a mandrel for bar penetrating operation, the diameter of the mandrel is 184mm, the main component of the used lubricant is crystalline flake graphite powder, the bar penetrating speed is set at 230mm/s, the obtained hollow billet is fed into the rolling section of a continuous rolling mill set, the hollow billet is continuously rolled by a 7-frame hot continuous rolling mill set with 3 rollers in each group at the speed of 370r/min, the hollow billet is removed from the bar and then is uniformly rolled by a uniform rolling machine to obtain a hollow billet with the outer diameter of 216mm and the wall thickness of 10.4mm, the hollow billet is heated to 1050 ℃ again for temperature compensation, the hollow billet is reduced and sized by a 26-frame three-roller sizing mill and a 14-frame three-roller sizing mill according to the production specification after being descaled by high pressure water, after sizing and discharging, advancing the pierced billet in a rotating mode, performing online water quenching in an internal spraying and external spraying mode, sawing the two ends, sending the pierced billet into a medium-frequency induction heating furnace for secondary heating to 950 ℃ for quenching, performing rapid water cooling in a rotating mode for 23s after heat preservation for 35min, finally performing 694 ℃ tempering, performing heat preservation for 135min, and performing straightening and air cooling. And further processing the steel pipe in a finishing operation area, and carrying out flaw detection operation and manual inspection. And (3) inspecting, performing sand blasting surface treatment on the steel pipe, performing alkali washing for 15min by using 15% sodium hydroxide solution, performing acid washing for 10min by using 10% sulfuric acid solution, washing the steel pipe by using clear water, soaking the steel pipe in an 8% potassium fluoride solution tank for 5min, taking out the steel pipe, drying the steel pipe, performing hot dip aluminizing, soaking the steel pipe in an aluminizing pan in which 7% of Si and 0.6% of Fe are dissolved for 5min, taking out the steel pipe, controlling the temperature to be 700 ℃ through an aluminizing furnace, controlling the deviation to be not more than 5 ℃, and performing water cooling after the inner and outer surfaces of the aluminized steel pipe are dried. The seamless steel pipe for the low and medium pressure boiler smoke pipe, which is prepared by the method of the invention, is obtained after the steel pipe is used as a cathode, the aluminum-magnesium alloy is used as an anode, and the micro-arc oxidation post-treatment is carried out in a compound mixed electrolyte with the main components of 10g/L sodium silicate, 1.5g/L sodium metaaluminate and 5g/L potassium hydroxide, the micro-arc oxidation temperature is 27 ℃, the constant voltage is 295V, the treatment is carried out for 28min, and the seamless steel pipe is inspected to be qualified, and the specification is phi 195mm multiplied by 8.0 mm.
The bending degree of each meter of the smoke tube obtained in each embodiment is less than 0.8mm/m, and each performance of the smoke tube is shown in the following table 1 and meets each index in GB 3087-2008.
The seamless steel pipes obtained in the comparative example and examples 1 to 3 were tested under the following conditions:
abrasion test conditions: on an abrasion tester, the disc rotating speed is set to be 400r/min, the maximum torque is set to be 14 N.m, and the abrasion tester is used for 15 min.
And (3) a hydraulic pressure holding test mode: and stopping boosting when the water pressure is increased to 5MPa, checking whether water leakage or abnormal phenomena exist, then increasing to 15MPa again and keeping for 30 minutes, and checking whether water leakage exists in the seamless steel pipe or whether water drops exist on the surface or not during pressure maintaining, and whether residual deformation occurs.
High temperature yield strength test conditions: the test was carried out in a tester at 500 ℃ for 4 h.
High temperature salt spray test mode: taking part of the steel pipe as a sample, controlling the test temperature to be 80 ℃ on a platform of a salt spray tester, continuously spraying in a test chamber at the spray amount of 2ml/h, and observing the corrosion condition of the steel pipe sample after 120 h. The test conditions are shown in Table 1.
Table 1:
as shown in Table 1, the comprehensive properties of examples 1-3 are much better than those of comparative example 1, and all the examples have good mechanical strength, surface hardness, high temperature resistance and corrosion resistance, especially, the examples 1 have the best properties.
Claims (4)
1. A manufacturing method of a seamless steel tube for a smoke tube is characterized by comprising the following steps:
(1) selecting a solid steel pipe raw material as a billet, wherein the solid steel pipe raw material 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 to 0.07%, Ni: 0.07-0.11% of Fe for the rest;
(2) sawing a raw material steel pipe, feeding the steel pipe into a ring furnace for heating, soaking for a certain time, discharging the steel pipe, feeding the steel pipe into a punching section, performing bar penetrating operation by using a core rod, feeding the obtained hollow billet into the rolling section of a continuous rolling mill set, performing continuous rolling, performing bar peeling, performing leveling by using a leveling machine, performing heating temperature compensation again, performing descaling by using high-pressure water, and then performing reducing and sizing to obtain a hollow billet;
(3) advancing the pierced billet in a rotating mode, performing online water quenching in an internal spraying and external spraying mode, sawing two ends, sending into an induction heating furnace for secondary heating quenching, performing water cooling in a rotating mode, and finally performing tempering, straightening and air cooling;
(4) further processing the steel pipe in a finishing operation area, and carrying out flaw detection operation and manual inspection;
(5) after sand blasting, alkali washing, acid washing and washing, the steel pipe is hot-dip aluminized after being dipped with plating assistant agent and dried, and then is treated after micro-arc oxidation.
2. The method for manufacturing a seamless steel pipe for a smoke pipe according to claim 1, wherein in the step (1): the annular furnace is provided with 6 sections of heating zones, and the temperatures are respectively as follows: 850-; the rod penetrating speed of the core rod is 190-240 mm/s; the reheating temperature compensation temperature is 980-1100 ℃; the tube rolling section of the continuous rolling unit comprises 5-8 groups of rollers, each group comprises 3 rollers, the rollers are evenly distributed around the steel tube in space, and the rotating speed of the rollers is 270-410 r/min.
3. The method for manufacturing a seamless steel pipe for a smoke pipe according to claim 1, wherein in the step (3): the secondary heating quenching temperature of the induction heating furnace is 920-960 ℃, and the temperature is kept for 30-40 min; the secondary water cooling time is 15-25 s; the tempering temperature is 640-710 ℃, and the temperature is kept for 100-145 min.
4. The method for manufacturing a seamless steel pipe for a smoke pipe according to claim 1, wherein in the step (5): the alkali washing solution is 10-20% of sodium hydroxide solution, and alkali washing is carried out for 15-25 min; the acid washing solution is a 10-15% sulfuric acid solution, and is subjected to acid washing for 5-10 min; 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 aluminizing aluminum liquid, the temperature is controlled at 705 ℃ and the aluminizing time is 3-5 min; the micro-arc oxidation electrolyte mainly comprises 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 20-30 min.
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