CN113584396A - Preparation process of fine steel for corrosion-resistant light steel villa keel - Google Patents
Preparation process of fine steel for corrosion-resistant light steel villa keel Download PDFInfo
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- 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
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- 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
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- 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
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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Abstract
The invention discloses a preparation process of fine steel for a corrosion-resistant light steel villa keel, which comprises the following steps: the method comprises the following steps: smelting raw materials; step two: refining and tapping; step three: pouring the tapped molten steel to form an ingot; step four: rolling, namely placing the continuous casting blank into a vacuum heating furnace for heating, and then performing 3-6 times of rough rolling to obtain an intermediate blank with the thickness of 30-50 mm; step five: carrying out heat treatment, and sequentially carrying out annealing treatment, quenching treatment and tempering treatment; step six: fine processing; step seven: entering a zinc pot for continuous hot dip galvanizing; step eight: cooling the steel strip by clean water, drying and finishing. This corrosion resistant type fine product steel preparation technology for light steel villa fossil fragments can form carbide and boride etc. on the surface and guarantee corrosion resistance, can reduce the structure dead weight through adding light materials such as aluminium simultaneously, through galvanizing treatment, guarantees surface compactness, avoids corroding, can guarantee long-term stable use simultaneously.
Description
Technical Field
The invention relates to the technical field of steel for light steel villa keels, in particular to a preparation process of fine steel for corrosion-resistant light steel villa keels.
Background
Along with the development of modern construction in China, the light steel keel is widely used in places such as hotels, terminal buildings, vehicle transportation stations, playgrounds, markets, factories, office buildings, old building reconstruction, indoor decoration arrangement, ceilings and the like, and particularly in the villa construction process, the light steel keel is used for building, so that the self weight is reduced, the rapid construction can be ensured, the strength is ensured, and at present, along with the increasing of the demand of the villa light steel keel, the production demand of keel steel is increased;
the Chinese patent application CN110144447A provides a high-strength corrosion-resistant oil casing steel material and a preparation process thereof, wherein the high-strength corrosion-resistant oil casing steel material comprises the following components: manganese element, nickel element, molybdenum element, chromium element, carbon element, silicon element, phosphorus element, sulfur element, boron element, niobium element, titanium element, zirconium element, cerium element, and the balance of iron element and inevitable impurities; according to the high-strength corrosion-resistant oil casing steel, metal elements such as niobium, titanium, zirconium and cerium and non-metal elements such as carbon, nitrogen and boron are added, so that carbides, nitrides and borides are formed on the surface of the steel and are tightly attached to the surface of the steel, and an excellent corrosion-resistant effect is achieved; meanwhile, the titanium/niobium anticorrosion system has a synergistic effect on the anticorrosion of nickel, chromium, manganese and molybdenum steel, and trace elements of titanium, niobium, zirconium or boron can play a relatively excellent anticorrosion role;
but the processed steel has large mass density and higher cost, and is not beneficial to ensuring the structural strength of the steel and reducing the weight of the steel;
in the preparation process of the light steel villa keel steel product in the prior art, when the steel product is prepared, the unit weight is difficult to reduce while the structural strength is ensured, the continuous galvanizing treatment is inconvenient, and the further reduction of the dead weight is not ensured;
therefore, we propose a process for preparing a fine steel material for a corrosion-resistant light steel villa keel, so as to solve the problems mentioned above.
Disclosure of Invention
The invention aims to provide a preparation process of a fine steel for a corrosion-resistant light steel villa keel, which aims to solve the problems that the prior steel proposed by the background art has large mass density and higher cost, and is not beneficial to ensuring the structural strength of the steel and reducing the weight of the steel; it is difficult to reduce the unit weight while guaranteeing structural strength, and is not convenient for carry out the galvanizing treatment in succession, is unfavorable for guaranteeing the further problem that reduces the dead weight.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of fine steel for corrosion-resistant light steel villa keels comprises the following steps:
the method comprises the following steps: smelting raw materials, namely preparing raw material components according to formula amount and putting the raw material components into a smelting furnace for smelting;
wherein the raw materials comprise the following components in parts by weight: c: 0.23-0.32%, Ni: 0.50-3.25%, Si: 0.34-0.39%, Al: 2.0-5.0%, Zr: 0.1-0.15%, Ti: 0.10-0.30%, Mn: 0.22-0.28%, B: 0.025 to 0.038%, Nb: 0.04-0.25%, Cr: 0.13-0.15%, Mo: 0.009-0.01%, S: 0.014-0.021%, P: 0.023 to 0.031 percent, and the balance being iron and inevitable impurities;
step two: refining and tapping, namely sequentially performing vacuum degassing treatment and deoxidation treatment on the smelting furnace;
wherein the vacuumizing pressure is less than or equal to 1Kpa, the vacuumizing time is more than or equal to 15min, and simultaneously, the deoxidation treatment is carried out at high temperature in a ladle refining furnace, and then steel tapping is carried out;
step three: carrying out casting molding treatment on the tapped molten steel to form an ingot;
step four: rolling, namely placing the continuous casting slab into a vacuum heating furnace for heating, performing 3-6 times of rough rolling to obtain an intermediate slab with the thickness of 30-50mm, and performing finish rolling on the intermediate slab by using a 4-7 rack to obtain a steel strip;
step five: carrying out heat treatment, and sequentially carrying out annealing treatment, quenching treatment and tempering treatment;
step six: fine processing;
step seven: entering a zinc pot for continuous hot dip galvanizing;
step eight: cooling the steel strip by clean water, drying and finishing.
Preferably, the raw materials in the first step comprise the following components in parts by weight: c: 0.28-0.30%, Ni: 1.2-2.8%, Si: 0.35-0.38%, Al: 2.6-4.2%, Zr: 0.12-0.135%, Ti: 0.14-0.23%, Mn: 0.23-0.26%, B: 0.028-0.035%, Nb: 0.08-0.17%, Cr: 0.132-0.146%, Mo: 0.009-0.01%, S: 0.016-0.018%, P: 0.027 to 0.030%, the balance being iron and unavoidable impurities.
Preferably, when smelting in the first step, firstly, the iron is put into the smelting furnace to be heated to 1150-plus-1550 ℃, heated and stirred for 40-50min, then the Si, Cr, Ni, Mn and Mo are added in sequence to keep heating and stirring for 30-40min, finally the rest components are added, the temperature of the high-temperature furnace is controlled to be 1550-plus-1650 ℃, and stirring is continued for 20-30min after the alloy elements are completely melted.
Preferably, argon is always introduced during the vacuum degassing treatment and the deoxidation treatment in the second step.
Preferably, the vacuumizing pressure in the second step is 0.2-0.35Kpa, and the vacuumizing time is 15-45 min.
Preferably, the deoxidation treatment in the step two is to place the degassed molten steel into a ladle refining furnace for LF refining, the temperature is raised to 1700-1800 ℃ within 3-5min for deoxidation treatment, the deoxidized molten steel is subjected to tapping treatment, and the tapping temperature is 1600-1700 ℃.
Preferably, the heat treatment in the fifth step is as follows:
wherein the annealing treatment is to heat the finish rolling blank to 860-1050 ℃ in a high temperature furnace and preserve heat for 10-20min, then reduce the furnace temperature to 350-450 ℃ at 50 ℃/min, then open the furnace door and continue slow cooling to 100-150 ℃, and take out of the furnace and cool the furnace to room temperature;
wherein the quenching treatment is that the annealed casting blank is heated to 700-800 ℃ at the speed of 35 ℃/min and is preserved for 30-40min, and the casting blank is rapidly cooled by high-pressure spray water after the furnace heat is heated to 850-900 ℃;
wherein the tempering treatment is to raise the temperature to 500-600 ℃, and to keep the temperature for 5-6h, and finally to slowly lower the temperature to 300-400 ℃ at the speed of 2 ℃/min, and to keep the temperature for 7-8 h.
Preferably, the fine processing in the sixth step comprises the following steps:
step 1: carrying out surface oil removal cleaning treatment on the steel strip subjected to heat treatment;
step 2: washing with clear water for 2-3 times after acid washing
And step 3: mechanically and finely polishing the surface of the steel strip, and washing with clear water for 1-2 times after dust removal;
and 4, step 4: and coating a layer of protective solvent on the surface of the steel strip, and drying.
Preferably, the protective solvent is a zinc chloride solvent or a mixed solvent formed by mixing ammonium chloride and zinc chloride.
Preferably, the continuous hot dip galvanizing in the seventh step is operated by a zinc pot, and the temperature of the zinc pot is kept at 445-465 ℃.
Compared with the prior art, the invention has the beneficial effects that: this corrosion resistant type fine product steel preparation technology for light steel villa fossil fragments can form carbide and boride etc. on the surface and guarantee corrosion resistance, can reduce the structure dead weight through adding light materials such as aluminium simultaneously, through galvanizing treatment, guarantees surface compactness, avoids corroding, can guarantee long-term stable use simultaneously.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a preparation process of fine steel for corrosion-resistant light steel villa keels comprises the following steps:
the method comprises the following steps: smelting raw materials, namely preparing raw material components according to formula amount and putting the raw material components into a smelting furnace for smelting;
the raw materials comprise the following components in parts by weight: c: 0.23-0.32%, Ni: 0.50-3.25%, Si: 0.34-0.39%, Al: 2.0-5.0%, Zr: 0.1-0.15%, Ti: 0.10-0.30%, Mn: 0.22-0.28%, B: 0.025 to 0.038%, Nb: 0.04-0.25%, Cr: 0.13-0.15%, Mo: 0.009-0.01%, S: 0.014-0.021%, P: 0.023 to 0.031 percent, and the balance being iron and inevitable impurities;
the raw materials comprise the following components in parts by weight: c: 0.28-0.30%, Ni: 1.2-2.8%, Si: 0.35-0.38%, Al: 2.6-4.2%, Zr: 0.12-0.135%, Ti: 0.14-0.23%, Mn: 0.23-0.26%, B: 0.028-0.035%, Nb: 0.08-0.17%, Cr: 0.132-0.146%, Mo: 0.009-0.01%, S: 0.016-0.018%, P: 0.027-0.030%, the balance being iron and unavoidable impurities;
when smelting is carried out, firstly, putting iron into a smelting furnace, heating to 1150-1550 ℃, heating and stirring for 40-50min, then adding Si, Cr, Ni, Mn and Mo in sequence, keeping heating and stirring for 30-40min, finally adding the rest components, controlling the temperature of the high-temperature furnace to 1550-1650 ℃, and continuing stirring for 20-30min after the alloy elements are completely melted;
step two: refining and tapping, namely sequentially carrying out vacuum degassing treatment and deoxidation treatment on the smelting furnace, wherein argon is always introduced in the processes of the vacuum degassing treatment and the deoxidation treatment;
wherein the vacuumizing pressure is less than or equal to 1Kpa, the vacuumizing time is more than or equal to 15min, and the vacuumizing pressure is 0.2-0.35Kpa and the vacuumizing time is 15-45min in the specific implementation process;
simultaneously performing deoxidation treatment at high temperature in the ladle refining furnace, and then tapping, wherein the deoxidation treatment is to place the degassed molten steel into the ladle refining furnace for LF refining, the temperature is raised to 1700-plus 1800 ℃ within 3-5min, and the deoxidation treatment is performed, the deoxidized molten steel is subjected to tapping treatment, and the tapping temperature is 1600-plus 1700 ℃;
step three: carrying out casting molding treatment on the tapped molten steel to form an ingot;
step four: rolling, namely placing the continuous casting slab into a vacuum heating furnace for heating, performing 3-6 times of rough rolling to obtain an intermediate slab with the thickness of 30-50mm, and performing finish rolling on the intermediate slab by using a 4-7 rack to obtain a steel strip;
step five: carrying out heat treatment, and sequentially carrying out annealing treatment, quenching treatment and tempering treatment;
wherein the annealing treatment is to heat the finish rolled blank in a high temperature furnace to 860-1050 ℃ and preserve heat for 10-20min, then reduce the furnace temperature to 350-450 ℃ at 50 ℃/min, then open the furnace door to continue slow cooling to 100-150 ℃, and take out of the furnace and cool the blank to room temperature;
wherein the quenching treatment is that the annealed casting blank is heated to 700-800 ℃ at the speed of 35 ℃/min and is preserved for 30-40min, and the casting blank is rapidly cooled by high-pressure spray water after the furnace heat is heated to 850-900 ℃;
wherein the tempering treatment is to raise the temperature to 500-600 ℃, preserve the temperature for 5-6h, finally slowly reduce the temperature to 300-400 ℃ at the speed of 2 ℃/min, and preserve the temperature for 7-8 h;
step six: fine processing;
wherein the fine treatment comprises the following steps:
step 1: carrying out surface oil removal cleaning treatment on the steel strip subjected to heat treatment;
step 2: washing with clear water for 2-3 times after acid washing
And step 3: mechanically and finely polishing the surface of the steel strip, and washing with clear water for 1-2 times after dust removal;
and 4, step 4: coating a layer of protective solvent on the surface of the steel strip, and drying, wherein the protective solvent is a zinc chloride solvent or a mixed solvent formed by mixing ammonium chloride and zinc chloride;
step seven: entering a zinc pot for continuous hot dip galvanizing, and operating through the zinc pot, wherein the temperature of the zinc pot is kept at 445-;
step eight: cooling the steel strip by clean water, drying and finishing.
Example (b):
firstly, the following components in parts by weight: c: 0.28%, Ni: 2.5%, Si: 0.36%, Al: 4.5%, Zr: 0.12%, Ti: 0.23%, Mn: 0.25%, B: 0.035%, Nb: 0.22%, Cr: 0.14%, Mo: 0.009%, S: 0.015%, P: 0.026%, and the balance of iron and inevitable impurities, heating iron in a furnace to 1450 ℃, heating and stirring for 45min, then sequentially adding Si, Cr, Ni, Mn and Mo, keeping heating and stirring for 30min, finally adding the rest components, controlling the temperature of the high-temperature furnace to 1630 ℃, and continuing stirring for 30min after the alloy elements are completely melted;
introducing argon into the furnace, and performing vacuum degassing treatment at a vacuum pressure of 0.25Kpa for 20 min;
deoxidizing the smelting furnace, placing the degassed molten steel into a ladle refining furnace for LF refining, raising the temperature to 1780 ℃ within 3min, deoxidizing, and tapping the deoxidized molten steel at 1620 ℃;
carrying out casting molding treatment on the tapped molten steel to form an ingot;
rolling, namely placing the continuous casting slab into a vacuum heating furnace for heating, performing 3-6 times of rough rolling to obtain an intermediate slab with the thickness of 30-50mm, and performing finish rolling on the intermediate slab by using a 4-7 rack to obtain a steel strip;
carrying out heat treatment, namely heating the finish rolling blank in a high-temperature furnace to 1000 ℃, preserving heat for 12min, then reducing the furnace temperature to 400 ℃ at a speed of 50 ℃/min, then opening a furnace door, continuously slowly cooling to 120 ℃, taking out of the furnace, air cooling to room temperature, and carrying out annealing treatment;
raising the temperature of the annealed casting blank to 760 ℃ at 35 ℃/min, preserving the heat for 35min, raising the furnace heat to 860 ℃ again, rapidly cooling the casting blank by using high-pressure jet water, and carrying out quenching treatment;
raising the temperature to 550 ℃, preserving heat for 5h, finally slowly reducing the temperature to 330 ℃ at the speed of 2 ℃/min, preserving heat for 8h, and tempering;
carrying out surface oil removal cleaning treatment on the steel strip subjected to heat treatment; washing with clear water for 3 times after pickling, mechanically and finely polishing the surface of the steel strip, washing with clear water for 2 times after dedusting, coating a layer of zinc chloride solvent on the surface of the steel strip, and drying;
continuously hot-dip galvanizing the steel strip in a zinc pot, operating in the zinc pot at 450 deg.C, cooling the steel strip with clear water, drying, and finishing
Those not described in detail in this specification are within the skill of the art. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation process of a fine steel for a corrosion-resistant light steel villa keel is characterized by comprising the following steps:
the method comprises the following steps: smelting raw materials, namely preparing raw material components according to formula amount and putting the raw material components into a smelting furnace for smelting;
wherein the raw materials comprise the following components in parts by weight: c: 0.23-0.32%, Ni: 0.50-3.25%, Si: 0.34-0.39%, Al: 2.0-5.0%, Zr: 0.1-0.15%, Ti: 0.10-0.30%, Mn: 0.22-0.28%, B: 0.025 to 0.038%, Nb: 0.04-0.25%, Cr: 0.13-0.15%, Mo: 0.009-0.01%, S: 0.014-0.021%, P: 0.023 to 0.031 percent, and the balance being iron and inevitable impurities;
step two: refining and tapping, namely sequentially performing vacuum degassing treatment and deoxidation treatment on the smelting furnace;
wherein the vacuumizing pressure is less than or equal to 1Kpa, the vacuumizing time is more than or equal to 15min, and simultaneously, the deoxidation treatment is carried out at high temperature in a ladle refining furnace, and then steel tapping is carried out;
step three: carrying out casting molding treatment on the tapped molten steel to form an ingot;
step four: rolling, namely placing the continuous casting slab into a vacuum heating furnace for heating, performing 3-6 times of rough rolling to obtain an intermediate slab with the thickness of 30-50mm, and performing finish rolling on the intermediate slab by using a 4-7 rack to obtain a steel strip;
step five: carrying out heat treatment, and sequentially carrying out annealing treatment, quenching treatment and tempering treatment;
step six: fine processing;
step seven: entering a zinc pot for continuous hot dip galvanizing;
step eight: cooling the steel strip by clean water, drying and finishing.
2. The process of claim 1, wherein the steel is selected from the group consisting of: the raw materials in the first step comprise the following components in parts by weight: c: 0.28-0.30%, Ni: 1.2-2.8%, Si: 0.35-0.38%, Al: 2.6-4.2%, Zr: 0.12-0.135%, Ti: 0.14-0.23%, Mn: 0.23-0.26%, B: 0.028-0.035%, Nb: 0.08-0.17%, Cr: 0.132-0.146%, Mo: 0.009-0.01%, S: 0.016-0.018%, P: 0.027 to 0.030%, the balance being iron and unavoidable impurities.
3. The process of claim 1, wherein the steel is selected from the group consisting of: when smelting in the first step, firstly putting iron into the smelting furnace, heating to 1150-plus-1550 ℃, heating and stirring for 40-50min, then adding Si, Cr, Ni, Mn and Mo in sequence, keeping heating and stirring for 30-40min, finally adding the rest components, controlling the temperature of the high-temperature furnace to 1550-plus-1650 ℃, and continuing stirring for 20-30min after the alloy elements are completely melted.
4. The process of claim 1, wherein the steel is selected from the group consisting of: and in the second step, argon is always introduced in the vacuum degassing treatment and the deoxidation treatment.
5. The process of claim 4, wherein the steel is selected from the group consisting of: in the second step, the vacuumizing pressure is 0.2-0.35Kpa, and the vacuumizing time is 15-45 min.
6. The process of claim 4, wherein the steel is selected from the group consisting of: and in the step two, the deoxidation treatment is to place the degassed molten steel into a ladle refining furnace for LF refining, the temperature is raised to 1700-1800 ℃ within 3-5min for deoxidation treatment, and the deoxidized molten steel is subjected to tapping treatment at 1600-1700 ℃.
7. The process of claim 1, wherein the steel is selected from the group consisting of: the heat treatment in the fifth step comprises the following steps:
wherein the annealing treatment is to heat the finish rolling blank to 860-1050 ℃ in a high temperature furnace and preserve heat for 10-20min, then reduce the furnace temperature to 350-450 ℃ at 50 ℃/min, then open the furnace door and continue slow cooling to 100-150 ℃, and take out of the furnace and cool the furnace to room temperature;
wherein the quenching treatment is that the annealed casting blank is heated to 700-800 ℃ at the speed of 35 ℃/min and is preserved for 30-40min, and the casting blank is rapidly cooled by high-pressure spray water after the furnace heat is heated to 850-900 ℃;
wherein the tempering treatment is to raise the temperature to 500-600 ℃, and to keep the temperature for 5-6h, and finally to slowly lower the temperature to 300-400 ℃ at the speed of 2 ℃/min, and to keep the temperature for 7-8 h.
8. The process of claim 1, wherein the steel is selected from the group consisting of: the fine processing in the sixth step comprises the following steps:
step 1: carrying out surface oil removal cleaning treatment on the steel strip subjected to heat treatment;
step 2: washing with clear water for 2-3 times after acid washing
And step 3: mechanically and finely polishing the surface of the steel strip, and washing with clear water for 1-2 times after dust removal;
and 4, step 4: and coating a layer of protective solvent on the surface of the steel strip, and drying.
9. The process of claim 8, wherein the steel is selected from the group consisting of: the protective solvent is a zinc chloride solvent or a mixed solvent formed by mixing ammonium chloride and zinc chloride.
10. The process of claim 1, wherein the steel is selected from the group consisting of: and in the seventh step, the continuous hot dip galvanizing is carried out through a zinc pot, and the temperature of the zinc pot is kept at 445-465 ℃.
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| CN202110905900.0A CN113584396A (en) | 2021-08-06 | 2021-08-06 | Preparation process of fine steel for corrosion-resistant light steel villa keel |
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| CN202110905900.0A CN113584396A (en) | 2021-08-06 | 2021-08-06 | Preparation process of fine steel for corrosion-resistant light steel villa keel |
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Application publication date: 20211102 |