CN116219274A - Steel for building engineering aluminum template pull tab and production method - Google Patents

Steel for building engineering aluminum template pull tab and production method Download PDF

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Publication number
CN116219274A
CN116219274A CN202211550199.6A CN202211550199A CN116219274A CN 116219274 A CN116219274 A CN 116219274A CN 202211550199 A CN202211550199 A CN 202211550199A CN 116219274 A CN116219274 A CN 116219274A
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China
Prior art keywords
rolling
steel
pull tab
equal
descaling
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CN202211550199.6A
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Chinese (zh)
Inventor
梁云科
安韶华
任茂勇
李玉明
董冠求
李军
郭朋
时晓杰
齐连营
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Tianjin New Tiangang United Special Steel Co Ltd
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Tianjin New Tiangang United Special Steel Co Ltd
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Priority to CN202211550199.6A priority Critical patent/CN116219274A/en
Publication of CN116219274A publication Critical patent/CN116219274A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention relates to the technical field of metallurgy, in particular to steel for a pull tab of an aluminum template in a building engineering and a production method. The raw materials of the aluminum template pull tab are medium carbon steel, and the weight percentage of the chemical components of the medium carbon steel comprises: c:0.52-0.58%; si:0.17-0.20%; mn:0.80-0.95%; cr:0.14-0.20%; p is less than or equal to 0.030%; s is less than or equal to 0.030; the balance being Fe. The production method comprises the following steps: selecting steel types meeting the requirements of chemical components, stacking and cooling continuous casting billets, heating the continuous casting billets, removing scales by high-pressure water after a furnace, rough rolling, rough descaling, finish rolling, finish descaling for head removal, laminar cooling, coiling, stacking and cooling, mechanically stirring shells, pickling, cleaning, rinsing, passivation, cold rolling, trimming and coiling. The steel for the constructional engineering aluminum template pull tab has good forging and stamping performance and completely meets the quality requirement of the steel for the constructional engineering aluminum template pull tab.

Description

Steel for building engineering aluminum template pull tab and production method
Technical Field
The invention relates to the technical field of metallurgy, in particular to steel for a pull tab of an aluminum template in a building engineering and a production method.
Background
Along with the rapid development of the building engineering industry in China, the pull-tab type aluminum alloy template system gradually replaces the traditional wood template system, and is widely applied, and the system has the advantages of good overall safety, simpler and more convenient construction, high template material and building finished product precision, excellent quality, more turnover times and obvious advantages in the aspects of reducing resource consumption and protecting environment. The pull-tab type aluminum alloy template system greatly improves the overall construction level of the building engineering, innovates the construction procedures of buildings such as houses and the like, and plays an important role in standardizing the construction procedures and promoting the healthy development of the building engineering industry.
The aluminum template pull tab is a thin steel sheet with the thickness of 2.0mm or less, and the length is determined according to the thickness of the wall column. When the concrete is constructed, the aluminum templates at two sides can be tightly pulled, the mold expansion and the mold explosion in the construction process are prevented, and the construction quality is ensured. After the concrete is solidified, the wall aluminum template is removed, the pull tab is left in the concrete, and the two ends of the pull tab extend out of the wall surface. After all the aluminum templates are removed, the extending part of the pull tab is broken, the pull tab is designed to have a V-shaped structure with concentrated stress, and the broken part is 5mm inside the wall surface, so that the influence on the subsequent decoration process is avoided.
The building industry standard of JG/T522-2017 aluminum alloy template does not clearly require what kind of material is used for the aluminum template pull tab, but only the Q235, Q355B and 45 steel clocks can be used for example, but the use requirements of the steel clocks must be met. At present, the aluminum alloy template is widely applied in China, but reports and researches on the production method of steel for aluminum template pull tabs are not many, and unified specifications are not formed. The steel for the aluminum template pull tab has larger control phase difference of mechanical properties, and the edge part sometimes has the defects of different sizes of cracks, forging, punching and breaking, difficult breakage of the extension part of the pull tab and the like.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a production method of steel for a pull tab of a building engineering aluminum template.
The invention adopts the technical proposal for solving the technical problems in the prior art that:
the invention aims at providing steel for a building engineering aluminum template pull tab, which adopts medium carbon steel as raw materials and comprises the following chemical components in percentage by mass: c:0.52-0.58%; si:0.17-0.20%; mn:0.80-0.95%; cr:0.14-0.20%; p is less than or equal to 0.030%; s is less than or equal to 0.030; the balance being Fe.
The invention selects the medium carbon steel, because the steel has higher tensile strength. The higher the Si content, the higher the viscosity of the scale, and the poorer the scale removal peelability. Therefore, the content of Si added is considered to be the viscosity of the iron scale and the peeling property of the scale removal, a certain amount of Si element is added into the steel, and a series of complex Si atoms, O atoms and Fe ions are generated by high-temperature heatingIs reacted to form Fe 2 SiO 4 The oxide layer structure is FeO and Fe 2 SiO 4 The mixed liquid phase of the (2) can play a role in pinning the iron scale, so that the adhesiveness of the iron scale is increased, the iron scale is difficult to remove cleanly in the subsequent descaling process, and the finished product causes the defect of pressing in the iron scale. Therefore, in the process of designing the chemical components of the steel grade, in order to improve the peeling property of the primary scale and the secondary scale, a method for reducing the Si content is adopted to reduce the liquid Fe 2 SiO 4 Is generated.
In addition, cr element has the effect of inhibiting oxidization, and Cr generates Cr at the interface of the iron scale and the iron matrix 2 O 3 And FeCr 2 O 4 And protecting oxidation products, and slowing down the diffusion speed of Fe and O elements so as to achieve the aim of inhibiting oxidation. Therefore, the method for improving the Cr content increases the hardenability, thereby reducing the interlayer spacing of the pearlite sheets and improving the tensile strength.
The invention also aims to provide a production method of steel for the aluminum template pull tab of the building engineering, which comprises the following steps:
s1, selecting steel grades meeting the chemical component requirements;
s2, stack cooling continuous casting billets: the continuous casting blank adopts an offline stack cooling method, and is cooled to room temperature; the step can promote the release of hydrogen in the steel and avoid the defects of cracks and the like generated by hot delivery of continuous casting blanks;
s3, feeding the continuous casting blank cooled to room temperature in the S2 into a heating furnace for heating; heating section temperature: the temperature of the soaking section is between 1100 and 1200 ℃ and the temperature of the soaking section is between 1200 and 1250 ℃, and the heating time is between 90 and 120 minutes;
s4, descaling with high-pressure water after the furnace: the descaling pressure is more than or equal to 16MPa, and the primary iron oxide skin can be effectively removed;
s5, rough rolling and rough descaling; the rough rolling adopts a full continuous rolling method, comprising 8-pass continuous rolling, each pass rolling is carried out for 1 time, and the single-pass reduction rate of rough rolling and flat rolling is 15-40%; after rolling, adopting high-pressure water to remove scales, wherein the descaling pressure is more than or equal to 15MPa, and removing secondary oxidized iron scales;
s6, finish rolling, fine descaling and fine descaling head yielding; the finish rolling adopts a full continuous rolling method, which comprises 11-pass continuous rolling, wherein each pass of rolling is carried out for 1 time, and the roller direction is as follows: 1 vertical-1 horizontal-2 vertical-3 horizontal-4 horizontal-5 horizontal-6 horizontal-7 horizontal-8 horizontal-9 horizontal; conventional hot rolled strip finishing is typically 1 stand +7 flat for 8 passes or no stand pass, only 7 passes flat. The invention can control the width and the size of the strip steel more accurately by 2-pass vertical rolling and 9-pass flat rolling, lighten the width control burden of finish rolling and reduce the edge defects. The flat rolling deformation is distributed in 9 passes, so that the motor load can be reduced, the deformation is more uniform, the finish rolling speed can be improved, the yield is improved, and the like. After finishing rolling is 1 st, adopting high-pressure water to remove scales, wherein the descaling pressure is more than or equal to 16MPa, and removing secondary oxidized iron scales; finely removing scales and letting heads;
the initial rolling temperature of the finish rolling is 980-1050 ℃; the finish rolling temperature is 840-890 ℃; the finish rolling speed of the finish rolling is 11.5-14.0m/s; the finish rolling threading time is 15-18s; single pass reduction rate of finish rolling and flat rolling: 10-40%; and 3, finish rolling 1 and 2 stands by adopting vertical roll grooved rolls, and pass reduction: less than or equal to 20mm;
s7, laminar cooling; after finish rolling, adopting a laminar cooling method, wherein the front section is rapidly cooled, the rear section is finely adjusted, and the cooling speed is 50-80 ℃/s;
s8, coiling; the cooling water of the winding drum is closed in advance during winding, and the cooling water of the winding drum is closed when the steel is thrown by the previous steel in F2; the coiling temperature is controlled to be 600-640 ℃; the coiling tension is 20-25KN;
s9, stacking and cooling; after the strip steel is taken off line, stacking and cooling the strip steel in a stacking position for more than 24 hours, wherein the temperature of the strip steel is below 100 ℃;
s10, mechanically pulling out a shell; adopting a plurality of bending rollers to break scales;
s11, pickling the steel strip subjected to shell pulling by using hydrochloric acid;
s12, cleaning and rinsing the pickled steel strip by using condensed water; the cleaning and rinsing temperature is 60-90 ℃;
s13, passivating the rinsed steel belt by adopting sodium nitrite aqueous solution with the mass concentration of 1-3%;
s14, cold rolling; rolling for 4-6 times by adopting a single-stand rolling mill or a continuous rolling mill, wherein the total reduction rate is 39-58%;
s15, cutting edges;
s16, rolling.
The invention can be further realized by adopting the following measures:
the production method of steel for the aluminum template pull tab of the building engineering comprises the step of heating the continuous casting billet, wherein the air-fuel ratio is controlled to be 0.60-0.70 for reducing decarburization.
The lower the air-fuel ratio is, the more the total decarburized layer depth of the steel can be reduced, and the fatigue life of the steel can be prolonged by controlling the total decarburized layer depth index. The total decarburized layer depth is generally required to be 80 μm or less, and the present invention can be made to be 25 μm or less.
The production method of the steel for the constructional engineering aluminum template pull tab, wherein the rough rolling process in S5 comprises the following steps of arrangement in the roll direction: 1-2-3-4-3-5; the rough rolling adopts compact full continuous rolling arrangement, and compared with common 3/4 continuous rolling and 1/2 semi continuous rolling, the rolling time is 30-60 seconds shorter. The problems of large temperature drop of the steel billet and large temperature difference between the head and the tail are solved, and the problems of large fluctuation of mechanical properties and easy scrap of the steel billet due to low temperature of the head are correspondingly solved. And the production efficiency can be improved, and strip steel with longer blank and larger coil weight can be produced. The thickness of the oxide scale can be reduced, and the yield is improved. After rough rolling is performed in 1 st stage, high-pressure water is adopted to remove scale, the scale removal pressure is more than or equal to 15MPa, and secondary oxide scales are removed; roughing 1, 2 and 3 stands adopts vertical roll grooved rolling, pass reduction: less than or equal to 40mm;
the production method of the steel for the aluminum template pull tab of the building engineering comprises the following steps that the rough rolling start temperature in S5 is 1090-1150 ℃; the rough rolling final rolling speed is more than or equal to 2.0m/s; rough rolling threading time is 35-40s; the traveling time of the intermediate blank in the intermediate roller way is 39-42s; the thickness of the intermediate blank is 26-30mm.
The production method of the steel for the aluminum template pull tab of the building engineering comprises the following steps that (S6) the head part of the strip steel is subjected to descaling through a descaling box for 2 seconds;
the production method of the steel for the aluminum template pull tab of the building engineering comprises the steps of after the working rolls of finish rolling F1 to F9 are changed, controlling the rolling mileage to be 50-100km.
The production method of the steel for the aluminum template pull tab of the building engineering comprises the steps of enabling the mass concentration of hydrochloric acid pickling solution in S11 to be 24-26%, and enabling the pickling temperature to be 60-70 ℃ and the pickling speed to be less than or equal to 2.0m/S.
The production method of the steel for the aluminum template pull tab of the building engineering has the following properties: breaking force is 26-30KN, and elongation after breaking is more than or equal to 4.5%; plate shape: the convexity of the plate is more than or equal to 0, and the qualification rate is 100%; edge crack rate: 0; the breaking rate of the extending part is 100%; the pickling yield is more than or equal to 99.50%; the surface is free from rust.
The production method of the steel for the aluminum template pull tab of the building engineering comprises the steps of: F+P; the depth of the total decarburized layer of the hot rolled strip steel is less than or equal to 25 mu m; the thickness of the hot rolled strip steel oxidized iron sheet is less than or equal to 10 mu m; the tensile strength of the hot rolled strip steel is more than or equal to 800MPa, and the elongation after breaking is more than or equal to 15.0%; the quality requirement of steel for the aluminum template pull tab of the building engineering is completely met.
The invention has the advantages and positive effects that:
1. in the aspect of chemical composition design: in order to improve the peeling property of the primary oxide scale and the secondary oxide scale, a method for reducing the content of Si is adopted to reduce liquid Fe 2 SiO 4 Is generated;
the hardenability is increased by adopting a method for increasing the Cr content, so that the interlayer spacing of pearlite sheets is reduced, the tensile strength is improved, in addition, cr element has the effect of inhibiting oxidization, and Cr generates Cr at the interface of iron scale and iron matrix 2 O 3 And FeCr 2 O 4 Protective oxidation products, and slowing down the diffusion speed of Fe and O elements so as to achieve the aim of inhibiting oxidation;
the invention selects medium carbon steel with higher tensile strength.
2. In order to reduce the damage to the steel head during finish rolling, the head is removed by fine descaling, and the hardness of the F6-F9 working rolls is HSD 80-85.
3. Because the finish rolling is not provided with a hydraulic bending roller and a roller shifting device, in order to ensure that the convexity of a finished plate is positive, the plate shape meets the production of cold rolling, the rolling mileage is limited, and after the finish rolling F1-F9 working rollers are changed, the rolling mileage is controlled to be 50-100km. The number of rolled kilometers is less than 50km, the convexity of the plate is easy to have negative value, the number of rolled kilometers is more than 100km, and the surface quality of the strip steel is deteriorated.
4. According to the invention, 5-pass vertical roll grooved rolling is adopted in 1-vertical, 2-vertical and 3-vertical rolling and 1-vertical and 2-vertical rolling in finish rolling, so that the stability of vertical rolling is improved, and the defects of rapid cooling, uneven deformation, cracking and folding of casting blank corners are avoided; meanwhile, the edge of the vertical roll hole type is descaled, so that secondary oxide scales are reduced.
5. The rough rolling and final rolling speed is increased to reduce rough rolling threading time, increase roller speed, reduce traveling time of intermediate blanks in an intermediate roller way, increase finish rolling speed and reduce finish rolling threading time, so that oxidation of steel during rolling is reduced; the improvement of the rolling speed also has the characteristics of high rolling efficiency and high yield in machine time.
6. The invention closes the cooling water of the winding drum in advance, and eliminates quenching cracks generated by quenching of the steel head.
7. The continuous casting blank adopts a cold stacking process to eliminate internal stress and avoid crack occurrence.
8. The finished strip steel adopts a cold stacking process to eliminate internal stress, reduce the aging period, improve the plasticity of the steel and stabilize the mechanical property.
9. The yield after pickling reaches 99.50 percent, which is higher than the level of 99.0 percent in the same industry.
10. The invention does not need annealing and leveling treatment after cold rolling, can be directly punched for use after cold rolling, and saves the production cost.
11. The steel for the constructional engineering aluminum template pull tab has good forging and stamping and punching performances.
12. The invention adopts passivation treatment to ensure that the surface of the finished product is free from rust.
13. The steel for the building engineering aluminum template pull tab replaces Q355B and 45 steel types, the national standard of Q355B requires the tensile strength of 470-630MPa, the national standard of 45 steel types requires the tensile strength of more than or equal to 600MPa, and the tensile strength of the steel for the building engineering aluminum template pull tab is more than or equal to 800MPa, which is higher than that of Q355B and 45 steel types. The invention ensures high strength, and the elongation after breaking is more than or equal to 4.5 percent, and the extension part of the pull tab is easy to break after all the aluminum templates are removed, thereby completely meeting the requirements of prefabrication construction of the aluminum templates.
Detailed Description
For a further understanding of the invention, its features and advantages, the following examples are set forth to illustrate the invention in more detail:
the invention discloses a production method of steel for a pull tab of an aluminum template in a building engineering, which comprises the following steps: selecting steel types meeting the requirements of chemical components, stacking and cooling continuous casting billets, heating the continuous casting billets, removing scales by high-pressure water after a furnace, rough rolling, rough descaling, finish rolling, finish descaling for head removal, laminar cooling, coiling, stacking and cooling, mechanically stirring shells, pickling, cleaning, rinsing, passivation, cold rolling, trimming and coiling.
Example 1
Step 1, selecting steel grades meeting the chemical composition requirements:
the steel for the aluminum template pull tab adopts medium carbon steel, and comprises the chemical components shown in the following table 1 in percentage by mass:
table 1 chemical composition units: (%)
C Si Mn Cr P S Fe
0.55 0.19 0.90 0.17 0.022 ≤0.015 Allowance of
Step 2, stacking cooling continuous casting billets:
the continuous casting blank adopts an offline stack cooling method, so that the release of hydrogen in steel is promoted, and the defects of cracks and the like generated by hot delivery of the continuous casting blank are avoided; after the stack cooling to room temperature, the material can be fed into a heating furnace; continuous casting billet section size: width 330mm and thickness 165mm.
Step 3, heating the continuous casting billet:
heating section temperature: 11 The temperature of the soaking section is between 00 and 1200 ℃, the temperature of the soaking section is between 1200 and 1250 ℃, and the heating time is between 90 and 120 minutes. To reduce decarburization, the air-fuel ratio is controlled to be 0.60 to 0.70.
Step 4, descaling with high-pressure water after the furnace:
the descaling pressure is 18MPa, and the primary ferric oxide skin can be effectively removed.
Step 5, rough rolling and rough descaling:
the rough rolling adopts a full continuous rolling method, which comprises 8-pass continuous rolling, wherein each pass of rolling is carried out for 1 time, and the roller direction is as follows: 1-2-3-4-3-5; after rough rolling is performed in 1 st stage, high-pressure water is adopted for descaling, the descaling pressure is 16MPa, and secondary oxide scales are removed; roughing 1, 2 and 3 stands adopts vertical roll grooved rolling, pass reduction: less than or equal to 40mm; rough rolling and flat rolling single pass reduction rate is 15-40%;
the initial rolling temperature of rough rolling is 1090-1150 ℃; rough rolling threading time is 37s; the thickness of the intermediate blank is 28mm; the traveling time of the intermediate blank in the intermediate roller way is 40s; the rough rolling final rolling speed is 2.3m/s;
step 6, finish rolling, fine descaling and head yielding:
the finish rolling adopts a full continuous rolling method, which comprises 11-pass continuous rolling, each-pass rolling is carried out for 1 time, and the arrangement of the roller direction is as follows: 1 vertical-1 horizontal-2 vertical-3 horizontal-4 horizontal-5 horizontal-6 horizontal-7 horizontal-8 horizontal-9 horizontal;
and (3) after finishing rolling is performed in the vertical stage 1, high-pressure water is adopted to remove scales, the scale removal pressure is 18MPa, and secondary oxide scales are removed.
Finely descaling, namely, allowing the head to pass through a descaling box and performing descaling for 2 seconds;
single pass reduction rate of finish rolling and flat rolling: 10-40%; and 3, finish rolling 1 and 2 stands by adopting vertical roll grooved rolls, and pass reduction: less than or equal to 20mm;
the initial rolling temperature of the finish rolling is 990-1050 ℃; the finish rolling temperature is 840-890 ℃; the finish rolling speed of the finish rolling is 11.5-14m/s; finish rolling threading time is 16s;
the hardness of the finish rolling F6-F9 working rolls is HSD 80-85;
after the finish rolling F1-F9 working rolls are changed, the rolling mileage is controlled to be 50-100km.
Step 7, laminar cooling:
and after finish rolling, adopting a laminar cooling method, performing front-stage rapid cooling, performing rear-stage fine adjustment, controlling the cooling speed to be 50-80 ℃/s, and controlling the coiling temperature to be 600-640 ℃.
Step 8, coiling method:
the coiling tension is 23KN, the cooling water of the coiling block is closed in advance during coiling, and the cooling water of the coiling block is closed when the last steel is thrown by F2; and obtaining hot rolled strip steel with the thickness of 3.3mm and the width of 355mm after coiling.
Step 9, stack cooling:
after the strip steel is taken off line, stacking and cooling are carried out for more than 24 hours at the stacking position, and the temperature of the strip steel is below 100 ℃.
Step 10, mechanically pulling a shell:
the scale is broken by a plurality of bending rollers.
Step 11, acid washing:
hydrochloric acid is used for pickling, the mass concentration of the hydrochloric acid is 24-26%, the pickling temperature is 60-70 ℃, and the pickling speed is 1.3m/s.
Step 12, cleaning and rinsing:
the condensed water is adopted for cleaning and rinsing at 60-90 ℃.
Step 13, passivation:
and (3) adopting sodium nitrite aqueous solution with mass concentration of 2% to perform rust prevention treatment.
Step 14, cold rolling:
and rolling by adopting a single-stand rolling mill or a continuous rolling mill for 4 times, wherein the total reduction rate is 39-58%.
Step 15, edge cutting:
cutting edges by a slitting machine, and removing 2mm on two sides respectively.
And step 16, rolling to obtain a finished product.
The thickness of the steel finished product for the aluminum mould plate pull tab of the building engineering is 1.7mm, and in addition, the steel for the aluminum mould plate pull tab of the building engineering prepared by the method has the following key indexes: mechanical properties of the pull-tab steel: breaking force is 28-30KN, and elongation after breaking is 5.0%; plate shape: the convexity of the plate is more than or equal to 0, and the qualification rate is 100%; edge crack rate: 0; the breaking rate of the extending part is 100%; the yield of the pickling is 99.55%; punching rate: 100%; the surface is free from rust. The hot rolled strip steel is an intermediate product, and the metallographic structure of the hot rolled strip steel is as follows: F+P; the total decarburized layer depth of the hot rolled strip steel is 18.5 mu m; the thickness of the hot rolled strip steel oxidized iron sheet is 8.4 mu m; the tensile strength of the hot rolled strip steel is 820-850MPa, and the elongation after breaking is 16.0-22.0%; the quality requirement of steel for the aluminum template pull tab of the building engineering is completely met.
Example 2
Step 1, selecting steel grades meeting the chemical composition requirements:
the steel for the aluminum template pull tab adopts medium carbon steel, and comprises the chemical components shown in Table 2 in percentage by mass:
table 2 chemical composition units: (%)
C Si Mn Cr P S Fe
0.54 0.20 0.88 0.18 0.020 0.010 Allowance of
Step 2, stacking cooling continuous casting billets:
the continuous casting blank adopts an offline stack cooling method, so that the release of hydrogen in steel is promoted, and the defects of cracks and the like generated by hot delivery of the continuous casting blank are avoided; after the stack cooling to room temperature, the material can be fed into a heating furnace; continuous casting billet section size: 380mm in width and 165mm in thickness.
Step 3, heating the continuous casting billet:
heating section temperature: the soaking section temperature is between 1100 and 1200 ℃ and the soaking section temperature is between 1200 and 1250 ℃, and the heating time is between 90 and 120 minutes. To reduce decarburization, the air-fuel ratio is controlled to be 0.60 to 0.70.
Step 4, descaling with high-pressure water after the furnace:
the descaling pressure is 19MPa, and the primary ferric oxide skin can be effectively removed.
Step 5, rough rolling and rough descaling:
the rough rolling adopts a full continuous rolling method, which comprises 8-pass continuous rolling, wherein each pass of rolling is carried out for 1 time, and the roller direction is as follows: 1-2-3-4-3-5;
after rough rolling is performed in 1 st stage, high-pressure water is adopted for descaling, the descaling pressure is 16MPa, and secondary oxide scales are removed;
the initial rolling temperature of rough rolling is 1090-1150 ℃; the rough rolling final rolling speed is 2.0m/s; rough rolling threading time is 39s; the traveling time of the intermediate blank in the intermediate roller way is 41s; rough rolling and flat rolling single pass reduction rate is 15-40%; roughing 1, 2 and 3 stands adopts vertical roll grooved rolling, pass reduction: less than or equal to 40mm; the thickness of the intermediate blank is 30mm.
Step 6, finish rolling, fine descaling and head yielding:
the finish rolling adopts a full continuous rolling method, which comprises 11-pass continuous rolling, wherein each pass of rolling is carried out for 1 time, and the roller direction is as follows: 1 vertical-1 horizontal-2 vertical-3 horizontal-4 horizontal-5 horizontal-6 horizontal-7 horizontal-8 horizontal-9 horizontal;
after finishing rolling is 1 st, adopting high-pressure water to remove scales, wherein the descaling pressure is 19MPa, and removing secondary oxidized iron scales;
finely descaling, namely, allowing the head to pass through a descaling box and performing descaling for 2 seconds;
the initial rolling temperature of the finish rolling is 980-1050 ℃; the finish rolling temperature is 840-890 ℃;
the finish rolling speed of the finish rolling is 11.5-13.0m/s; finish rolling threading time is 17s; single pass reduction rate of finish rolling and flat rolling: 10-40%;
and 3, finish rolling 1 and 2 stands by adopting vertical roll grooved rolls, and pass reduction: less than or equal to 20mm;
the hardness of the finish rolling F6-F9 working rolls is HSD 80-85;
after the finish rolling F1-F9 working rolls are changed, the rolling mileage is controlled to be 50-100km.
Step 7, laminar cooling:
and after finish rolling, adopting a laminar cooling method, performing front-stage rapid cooling, performing rear-stage fine adjustment, controlling the cooling speed to be 50-80 ℃/s, and controlling the coiling temperature to be 600-640 ℃.
Step 8, coiling method:
the coiling tension is 25KN, the cooling water of the coiling block is closed in advance during coiling, and the cooling water of the coiling block is closed when the last steel is thrown by F2. And obtaining hot rolled strip steel with the thickness of 3.4mm and the width of 403mm after coiling.
Step 9, stack cooling:
after the strip steel is taken off line, stacking and cooling are carried out for more than 24 hours at the stacking position, and the temperature of the strip steel is below 100 ℃.
Step 10, mechanically pulling a shell:
the scale is broken by a plurality of bending rollers.
Step 11, acid washing:
hydrochloric acid is used for pickling, the mass concentration of the hydrochloric acid is 24-26%, the pickling temperature is 60-70 ℃, and the pickling speed is 1.6m/s.
Step 12, cleaning and rinsing:
condensed water is adopted, and the cleaning and rinsing temperatures are 60-90 DEG C
Step 13, passivation:
adopting sodium nitrite aqueous solution with mass concentration of 1-3% for rust-proof treatment.
Step 14, cold rolling:
rolling 5 times by a single frame rolling mill or a continuous rolling mill, wherein the total reduction rate is 39-58%
Step 15, edge cutting:
cutting edges by a slitting machine, and removing 1mm from each of two sides.
And step 16, rolling to obtain a finished product.
The thickness of the steel finished product for the aluminum mould plate pull tab of the building engineering is 1.8mm, and in addition, the steel for the aluminum mould plate pull tab of the building engineering prepared by the method has the following key indexes: mechanical properties of the pull-tab steel: breaking force is 28-30KN, and elongation after breaking is 5.5%; plate shape: the convexity of the plate is more than or equal to 0, and the qualification rate is 100%; edge crack rate: 0; the breaking rate of the extending part is 100%; the yield of acid washing is 99.50%; punching rate: 100%; the surface is free from rust. The hot rolled strip steel is an intermediate product, and the metallographic structure of the hot rolled strip steel is as follows: F+P; the depth of the total decarburized layer of the hot rolled strip steel is 20 mu m; the thickness of the hot rolled strip steel oxidized iron sheet is 9.0 mu m; the tensile strength of the hot rolled strip steel is 830-860MPa, and the elongation after breaking is more than or equal to 17.0-23%; the quality requirement of steel for the aluminum template pull tab of the building engineering is completely met.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The utility model provides a building engineering aluminium template steel for pulling-on piece which characterized in that: the raw materials of the aluminum template pull tab are medium carbon steel, and the weight percentage of the chemical components of the medium carbon steel comprises: c:0.52-0.58%; si:0.17-0.20%; mn:0.80-0.95%; cr:0.14-0.20%; p is less than or equal to 0.030%; s is less than or equal to 0.030; the balance being Fe.
2. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 1, comprising the steps of:
s1, selecting steel grades meeting the chemical component requirements;
s2, stack cooling continuous casting billets: the continuous casting blank adopts an offline stack cooling method, and is cooled to room temperature; the step can promote the release of hydrogen in the steel and avoid the defects of cracks and the like generated by hot delivery of continuous casting blanks;
s3, feeding the continuous casting blank cooled to room temperature in the S2 into a heating furnace for heating; the temperature of the heating section is 1100-1200 ℃, the temperature of the soaking section is 1200-1250 ℃, and the heating time is 90-120 min.
S4, descaling with high-pressure water after the furnace: the descaling pressure is more than or equal to 16MPa, and the primary iron oxide skin can be effectively removed;
s5, rough rolling and rough descaling; the rough rolling adopts a full continuous rolling method, comprising 8-pass continuous rolling, each pass rolling is carried out for 1 time, and the single-pass reduction rate of rough rolling and flat rolling is 15-40%; after rolling, adopting high-pressure water to remove scales, wherein the descaling pressure is more than or equal to 15MPa, and removing secondary oxidized iron scales;
s6, finish rolling, fine descaling and fine descaling head yielding; the finish rolling adopts a full continuous rolling method, which comprises 11-pass continuous rolling, wherein each pass of rolling is carried out for 1 time, and the roller direction is as follows: 1 vertical-1 horizontal-2 vertical-3 horizontal-4 horizontal-5 horizontal-6 horizontal-7 horizontal-8 horizontal-9 horizontal; after finishing rolling is 1 st, adopting high-pressure water to remove scales, wherein the descaling pressure is more than or equal to 16MPa, and removing secondary oxidized iron scales; finely removing scales and letting heads;
s7, laminar cooling; after finish rolling, adopting a laminar cooling method, wherein the front section is rapidly cooled, the rear section is finely adjusted, and the cooling speed is 50-80 ℃/s;
s8, coiling; the cooling water of the winding drum is closed in advance during winding, and the cooling water of the winding drum is closed when the steel is thrown by the previous steel in F2; the coiling temperature is controlled to be 600-640 ℃; the coiling tension is 20-25KN;
s9, stacking and cooling; after the strip steel is taken off line, stacking and cooling the strip steel in a stacking position for more than 24 hours, wherein the temperature of the strip steel is below 100 ℃;
s10, mechanically pulling out a shell; adopting a plurality of bending rollers to break scales;
s11, pickling the steel strip subjected to shell pulling by using hydrochloric acid;
s12, cleaning and rinsing the pickled steel strip by using condensed water; the cleaning and rinsing temperature is 60-90 ℃;
s13, passivating the rinsed steel belt by adopting sodium nitrite aqueous solution with the mass concentration of 1-3%;
s14, cold rolling; rolling for 4-6 times by adopting a single-stand rolling mill or a continuous rolling mill, wherein the total reduction rate is 39-58%;
s15, cutting edges;
s16, rolling.
3. The method for producing steel for a pull tab of a construction aluminum form according to claim 2, wherein the air-fuel ratio in S3 is controlled to be 0.60 to 0.70.
4. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 2, wherein: the rough rolling process in S5 includes the arrangement of the roll directions: 1-2-3-4-3-5; after rough rolling is performed in 1 st stage, high-pressure water is adopted to remove scale, the scale removal pressure is more than or equal to 15MPa, and secondary oxide scales are removed; roughing 1, 2 and 3 stands adopts vertical roll grooved rolling, pass reduction: less than or equal to 40mm.
5. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 2, wherein: the initial rolling temperature of rough rolling in S5 is 1090-1150 ℃; the rough rolling final rolling speed is more than or equal to 2.0m/s; rough rolling threading time is 35-40s; the traveling time of the intermediate blank in the intermediate roller way is 39-42s; the thickness of the intermediate blank is 26-30mm.
6. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 2, wherein: and S6, the steel in the strip head is subjected to descaling through a descaling box for 2 seconds.
7. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 2, wherein: s7, the initial rolling temperature of finish rolling is 980-1050 ℃; the finish rolling temperature is 840-890 ℃; the finish rolling speed of the finish rolling is 11.5-14.0m/s; the finish rolling threading time is 15-18s; single pass reduction rate of finish rolling and flat rolling: 10-40%; and 3, finish rolling 1 and 2 stands by adopting vertical roll grooved rolls, and pass reduction: and is less than or equal to 20mm.
8. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 2, wherein: s7, after the finish rolling F1-F9 working rolls are changed, the rolling mileage is controlled to be 50-100km.
9. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 2, wherein: the mass concentration of the hydrochloric acid pickling solution in S11 is 24-26%, the pickling temperature is 60-70 ℃, and the pickling speed is less than or equal to 2.0m/S.
10. The method for producing steel for a pull tab of an aluminum form for construction engineering according to claim 2, wherein: the steel for the aluminum template pull tab of the building engineering prepared by the method has the following properties: breaking force is 26-30KN, and elongation after breaking is more than or equal to 4.5%; plate shape: the convexity of the plate is more than or equal to 0, and the qualification rate is 100%; edge crack rate: 0; the breaking rate of the extending part is 100%; the pickling yield is more than or equal to 99.50%; the surface is free from rust;
the hot rolled strip steel is an intermediate product, and the metallographic structure of the hot rolled strip steel is as follows: F+P; the depth of the total decarburized layer of the hot rolled strip steel is less than or equal to 25 mu m; the thickness of the hot rolled strip steel oxidized iron sheet is less than or equal to 10 mu m; the tensile strength of the hot rolled strip steel is more than or equal to 800MPa, and the elongation after breaking is more than or equal to 15.0%; the quality requirement of steel for the aluminum template pull tab of the building engineering is completely met.
CN202211550199.6A 2022-12-05 2022-12-05 Steel for building engineering aluminum template pull tab and production method Pending CN116219274A (en)

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