CN111349863A - Process for producing S350GD + Z hot galvanizing product with thickness less than 2.0mm - Google Patents
Process for producing S350GD + Z hot galvanizing product with thickness less than 2.0mm Download PDFInfo
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- CN111349863A CN111349863A CN201911207362.7A CN201911207362A CN111349863A CN 111349863 A CN111349863 A CN 111349863A CN 201911207362 A CN201911207362 A CN 201911207362A CN 111349863 A CN111349863 A CN 111349863A
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- 238000005246 galvanizing Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000005096 rolling process Methods 0.000 claims abstract description 72
- 238000005554 pickling Methods 0.000 claims abstract description 60
- 238000009749 continuous casting Methods 0.000 claims abstract description 51
- 239000002253 acid Substances 0.000 claims abstract description 44
- 230000006698 induction Effects 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002161 passivation Methods 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000011574 phosphorus Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000010422 painting Methods 0.000 claims abstract 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 24
- 239000011701 zinc Substances 0.000 claims description 24
- 229910052725 zinc Inorganic materials 0.000 claims description 24
- 239000012535 impurity Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 6
- 238000005098 hot rolling Methods 0.000 abstract description 3
- 238000007761 roller coating Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003679 aging effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- 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
- C23C2/003—Apparatus
-
- 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
- C23C2/06—Zinc or cadmium 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to the technical field of hot galvanizing processes, in particular to a process for producing S350GD + Z hot galvanizing products with the thickness of less than 2.0 mm. Comprises a continuous casting and rolling process and an acid pickling and galvanizing process; in the continuous casting and rolling process, a steel ladle, continuous casting, rough rolling, induction heating, high-pressure dephosphorization, finish rolling, laminar cooling and coiling are carried out by a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the pickling galvanizing process comprises the steps of breaking phosphorus, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawal, roller painting passivation and coiling through a pickling galvanizing production line to obtain the hot galvanizing coil. The invention reduces the cost of the alloy elements by adjusting the component design of the raw materials and reducing the content of the alloy elements. By reducing the hot rolling coiling temperature and leveling the pickling hot galvanizing production line under high pressure, the yield strength of the rolled plate is improved, and the production of S350GD + Z high-strength galvanized plates is realized.
Description
Technical Field
The invention relates to the technical field of hot galvanizing processes, in particular to a process for producing S350GD + Z hot galvanizing products with the thickness of less than 2.0 mm.
Background
With the progress of steel rolling technology, the demand of S350GD + Z high-strength hot-dip galvanized products is larger and larger. S350GD + Z refers to a high-strength hot-dip galvanized product with the yield strength of 350MPA, and the traditional S350GD + Z-level galvanized high-strength steel component design generally realizes the strengthening of the strength performance by increasing the content of Mn and other alloy elements. However, an increase in the content of alloying elements leads to a significant increase in production costs. At present, no method which has low cost and can realize 350MPA high-strength hot-dip galvanized products exists.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a process for producing S350GD + Z hot-dip galvanized products with the thickness less than 2.0mm, which improves the yield strength of a coiled plate by adjusting the design of raw material components, reducing the hot rolling coiling temperature and flattening an acid washing hot-dip galvanizing production line under high pressure, so that the performance meets the standard requirement of S350GD + Z product performance designed by high alloy components.
A process for producing S350GD + Z hot galvanizing products with the thickness of less than 2.0mm is characterized in that: comprises a continuous casting and rolling process and an acid pickling and galvanizing process; according to the continuous casting and rolling process, a steel ladle, continuous casting, rough rolling, induction heating, high-pressure dephosphorization, finish rolling, laminar cooling and coiling are carried out through a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the raw material components of the continuous casting and rolling process comprise the following components in percentage by weight: less than or equal to 0.045% of C, 0.030% -0.045% of Si, 0.05% -0.11% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0030% of S, 0.025% -0.045% of Alt, and the balance of Fe and inevitable impurities; the pickling galvanizing process comprises the steps of carrying out phosphorus breaking, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawal, roller coating passivation and coiling on a pickling galvanizing production line to obtain the hot galvanizing coil.
Preferably, in the continuous casting and rolling process, the thickness of the plate blank is controlled to be 9.5mm-14.0mm in the intermediate blank stage, and the thickness of the finished product is controlled to be 1.0mm-2.0mm in the finished product stage.
Preferably, in the continuous casting and rolling process, the thickness of the slab in the rough rolling area is less than or equal to 2.0, the temperature difference between the R1 inlet temperature and the slab is less than or equal to 35 ℃, and the R3 outlet temperature is more than 980 ℃.
Preferably, in the continuous casting and rolling process, the temperature of an IH outlet in an induction heating furnace is controlled to be 1110-1190 ℃, and the dephosphorization pressure is more than or equal to 340 bar; when the thickness of the finished product is more than 1.2mm and more than or equal to 2mm, the finishing rolling temperature is controlled to be 840 +/-20 ℃, and the coiling temperature is controlled to be 550 +/-10 ℃.
Preferably, in the continuous casting and rolling process: when the thickness of the finished product is more than or equal to 1.2mm and more than or equal to 1.0mm, the final rolling temperature is controlled to be 840 +/-20 ℃, and the coiling temperature is controlled to be 570 +/-10 ℃.
Preferably, in the acid pickling galvanization process: the pickling tanks are two and comprise a No. 1 tank and a No. 2 tank, wherein the No. 1 tank has the acid concentration of 60-80g/L, the total acidity is more than or equal to 180g/L, and the acid temperature is 80-85 ℃; the rinsing temperature of the rinsing section is 45-60 ℃.
Preferably, in the pickling galvanizing process, after the rolled plate is rinsed, leveling and finishing operations are carried out; the elongation of the scale breaker is controlled to be 0.5-0.7%, the elongation of the leveler is controlled to be 3.0-3.5%, the elongation of the finishing mill is controlled to be 4.0%, the elongation of the pulling and straightening mill is controlled to be 0.3-0.5%, and the total elongation of the leveling mill is controlled to be 7.8-8.5%. The performance of the rolled plate is enhanced by improving the flattening and finishing elongation. Meanwhile, the leveling elongation is increased before the zinc pot is put into the zinc pot, so that the shape of the high-strength steel plate can be improved.
Preferably, in the acid pickling galvanization process: the pot-entering temperature of the galvanizing zinc pot is controlled to be 480-520 ℃, the temperature of zinc liquid is controlled to be 465 +/-5 ℃, and the content of AL% is controlled to be 0.2-0.25.
Preferably, in the acid pickling galvanization process: the galvanizing furnace and the zinc pot are heated by adopting induction coils, and heat is generated under the heat effect of current to heat the rolled plate. The induction coil has a maximum heating capacity of 550 ℃, which is greatly different from the traditional galvanization, the traditional galvanization adopts the heating mode of open fire heating or electric radiant tube heating, the heating temperature is higher, the annealing temperature is more than or equal to 700 ℃, and the coiled plate is subjected to recrystallization annealing. In the application, the coiled plate is not recrystallized, but the internal diffusion capacity of atoms is enhanced along with the increase of the heating temperature, the aging effect is enhanced, and the performance of the coiled plate is further enhanced.
And the Cl-ions and impurities on the surface of the rolled plate are rinsed and washed off, so that the cleanness of the surface of the rolled plate is ensured. Cl-ions remained on the surface of the rolled plate cause the surface of the rolled plate to be yellow, the adhesion force of a zinc layer during galvanizing is seriously influenced, and the defect of pitted surface is generated on the surface of a galvanized product.
The concentration of the free acid in the No. 2 acid tank is not controlled, and the concentration of the free acid in the No. 2 acid tank can be indirectly controlled by controlling the concentration of the free acid in the No. 1 acid tank.
The invention has the advantages of
The invention has reasonable component design, good product surface quality, stable performance and size deviation and excellent coating binding force. The cost of the alloy elements is reduced by reducing the content of the alloy elements such as Mn content and the like. The hot-rolled galvanized steel plate adopts the component design of the grade of a common galvanized steel plate, adjusts the hot rolling process and the acid pickling galvanizing process to realize the performance strengthening of the steel plate, improves the yield strength and the tensile strength of the steel plate by designing and leveling twice to achieve the performance strengthening of the product, and realizes the industrial production of S350GD + Z high-strength hot-dip galvanized products with the thickness less than 2.0. Energy is saved, cost is reduced, and considerable social and economic benefits are achieved.
Average performance: the yield strength is 375MPa, the tensile strength is 430MPa, and the elongation is 20 percent; the product meets the requirements of performance standard: the yield strength is more than or equal to 350 MPa; tensile strength MPa: not less than 420 MPa; the elongation A80 after fracture is more than or equal to 16 percent.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the present invention.
Example 1
A process for producing 2.0mm S350GD + Z hot galvanizing products comprises a continuous casting and rolling process and an acid pickling and galvanizing process; in the continuous casting and rolling process, a steel ladle is continuously cast, roughly rolled, inductively heated, dephosphorized under high pressure, finely rolled, cooled by laminar flow and coiled by a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the raw material components of the continuous casting and rolling process comprise the following components in percentage by weight: 0.036% of C, 0.039% of Si, 0.087% of Mn, 0.012% of P, 0.00079% of S, 0.025% of Alt, and the balance of Fe and inevitable impurities; and the pickling and galvanizing process comprises the steps of breaking phosphorus, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawing, roller coating passivation and coiling through a pickling and galvanizing production line to obtain the hot galvanized coil.
In the continuous casting and rolling process, the thickness of a rough rolling plate blank is controlled to be 10.0mm in an intermediate blank stage, and the thickness of a finished product stage is controlled to be 2.0 mm; the thickness of the plate blank in the rough rolling area is 2.0mm, the temperature difference between the R1 inlet temperature plate and the plate is less than or equal to 35 ℃, and the R3 outlet temperature is 982 ℃; the temperature of an IH outlet in the induction heating furnace is controlled at 1091 ℃, and the dephosphorization pressure is more than or equal to 340 bar; the finishing temperature is controlled at 830 ℃, and the coiling temperature is controlled at 550 ℃.
In the pickling and galvanizing process, two pickling tanks are arranged, including a No. 1 tank and a No. 2 tank, wherein the concentration of the acid in the No. 1 tank is 65g/l, the temperature of the acid is 82 ℃, and the total acidity of the No. 1 tank is 185 g/l; the total acidity of the No. 2 groove is 190g/l, and the acid temperature is 79 ℃; the water temperature in the rinsing section is 55 ℃.
After the rolled plate is rinsed, carrying out leveling and finishing operations; the elongation of the scale breaker is controlled to be 0.7%, the elongation of the leveler is controlled to be 3.2%, the elongation of the temper mill is controlled to be 4.0%, the elongation of the tension leveler is controlled to be 0.3%, and the total elongation of the tension leveler is controlled to be 8.2%. The pot-entering temperature of the galvanizing zinc pot is controlled to be 480-520 ℃, the temperature of zinc liquid is controlled to be 465 +/-5 ℃, and the content of AL% is controlled to be 0.2-0.25. The galvanizing furnace and the zinc pot are heated by adopting induction coils, and heat is generated under the thermal effect of current to heat the rolled plate.
S350GD + Z hot dip galvanized sheet of example 12.0 mm was obtained.
Example 2
A process for producing 1.8mm S350GD + Z hot galvanizing products comprises a continuous casting and rolling process and an acid pickling and galvanizing process; in the continuous casting and rolling process, a steel ladle is continuously cast, roughly rolled, inductively heated, dephosphorized under high pressure, finely rolled, cooled by laminar flow and coiled by a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the raw material components of the continuous casting and rolling process comprise the following components in percentage by weight: 0.035% of C, 0.039% of Si, 0.077% of Mn, 0.012% of P, 0.00087% of S, 0.026% of Alt, and the balance of Fe and inevitable impurities; and the pickling and galvanizing process comprises the steps of breaking phosphorus, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawing, roller coating passivation and coiling through a pickling and galvanizing production line to obtain the hot galvanized coil.
In the continuous casting and rolling process, the thickness of a rough rolling plate blank is controlled to be 11.0mm in the intermediate blank stage, and the thickness of a finished product is controlled to be 1.8mm in the finished product stage; the thickness of the plate blank in the rough rolling area is 1.8mm, the temperature difference between the R1 inlet temperature plate and the plate is less than or equal to 35 ℃, and the R3 outlet temperature is 985 ℃; the temperature of an IH outlet in the induction heating furnace is controlled at 1093 ℃, and the dephosphorization pressure is more than or equal to 340 bar; the finishing temperature is controlled to be 835 ℃, and the coiling temperature is controlled to be 560 ℃.
In the pickling and galvanizing process, two pickling tanks are arranged, wherein the two pickling tanks comprise a No. 1 tank and a No. 2 tank, the concentration of the acid in the No. 1 tank is 67g/l, and the total acidity of the No. 1 tank is 187g/l, and the acid temperature is 83 ℃; the total acidity of the No. 2 groove is 193g/l, and the acid temperature is 76 ℃; the temperature of the water in the rinsing section is 50 ℃.
After the rolled plate is rinsed, carrying out leveling and finishing operations; the elongation of the scale breaker is controlled to be 0.7%, the elongation of the leveler is controlled to be 3.2%, the elongation of the temper mill is controlled to be 4.0%, the elongation of the tension leveler is controlled to be 0.3%, and the total elongation of the tension leveler is controlled to be 8.2%. The pot-entering temperature of the galvanizing zinc pot is controlled to be 480-520 ℃, the temperature of zinc liquid is controlled to be 465 +/-5 ℃, and the content of AL% is controlled to be 0.2-0.25. The galvanizing furnace and the zinc pot are heated by adopting induction coils, and heat is generated under the thermal effect of current to heat the rolled plate.
S350GD + Z hot dip galvanized sheet of example 21.8 mm was obtained.
Example 3
A process for producing 1.5mm S350GD + Z hot galvanizing products comprises a continuous casting and rolling process and an acid pickling and galvanizing process; in the continuous casting and rolling process, a steel ladle is continuously cast, roughly rolled, inductively heated, dephosphorized under high pressure, finely rolled, cooled by laminar flow and coiled by a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the raw material components of the continuous casting and rolling process comprise the following components in percentage by weight: 0.042% of C, 0.042% of Si, 0.082% of Mn, 0.013% of P, 0.00027% of S, 0.029% of Alt, and the balance of Fe and inevitable impurities; and the pickling and galvanizing process comprises the steps of breaking phosphorus, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawing, roller coating passivation and coiling through a pickling and galvanizing production line to obtain the hot galvanized coil.
In the continuous casting and rolling process, the thickness of a rough rolling plate blank is controlled to be 13.0mm in the intermediate blank stage, and the thickness of a finished product is controlled to be 1.5mm in the finished product stage; the thickness of the plate blank in the rough rolling area is 1.5mm, the temperature difference between the R1 inlet temperature plate and the plate is less than or equal to 35 ℃, and the R3 outlet temperature is 990 ℃; the temperature of an IH outlet in the induction heating furnace is controlled at 1095 ℃, and the dephosphorization pressure is more than or equal to 340 bar; the finishing temperature is controlled to 845 ℃, and the coiling temperature is controlled to 572 ℃.
In the pickling and galvanizing process, two pickling tanks are arranged, wherein the two pickling tanks comprise a No. 1 tank and a No. 2 tank, the concentration of acid in the No. 1 tank is 70g/l, and the total acidity of the No. 1 tank is 189g/l, and the acid temperature is 81 ℃; the total acidity of the No. 2 groove is 200g/l, and the acid temperature is 77 ℃; the temperature of the water in the rinsing section is 52 ℃.
After the rolled plate is rinsed, carrying out leveling and finishing operations; the elongation of the scale breaker is controlled to be 0.6%, the elongation of the leveler is controlled to be 3.2%, the elongation of the finishing machine is controlled to be 4.0%, the elongation of the pulling and straightening is controlled to be 0.3%, and the total elongation is controlled to be 8.1%. The pot-entering temperature of the galvanizing zinc pot is controlled to be 480-520 ℃, the temperature of zinc liquid is controlled to be 465 +/-5 ℃, and the content of AL% is controlled to be 0.2-0.25. The galvanizing furnace and the zinc pot are heated by adopting induction coils, and heat is generated under the thermal effect of current to heat the rolled plate.
S350GD + Z hot dip galvanized sheet of example 31.5 mm was obtained.
Example 4
A process for producing 1.2mm S350GD + Z hot galvanizing products comprises a continuous casting and rolling process and an acid pickling and galvanizing process; in the continuous casting and rolling process, a steel ladle is continuously cast, roughly rolled, inductively heated, dephosphorized under high pressure, finely rolled, cooled by laminar flow and coiled by a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the raw material components of the continuous casting and rolling process comprise the following components in percentage by weight: 0.038% of C, 0.038% of Si, 0.077% of Mn, 0.009% of P, 0.00012% of S, 0.039% of Alt, and the balance of Fe and inevitable impurities; and the pickling and galvanizing process comprises the steps of breaking phosphorus, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawing, roller coating passivation and coiling through a pickling and galvanizing production line to obtain the hot galvanized coil.
In the continuous casting and rolling process, the thickness of a rough rolling plate blank is controlled to be 14.0mm in the intermediate blank stage, and the thickness of a finished product is controlled to be 1.2mm in the finished product stage; the thickness of the plate blank in the rough rolling area is 1.2mm, the temperature difference between the R1 inlet temperature plate and the plate is less than or equal to 35 ℃, and the R3 outlet temperature is 995 ℃; the temperature of an IH outlet in the induction heating furnace is controlled to be 1105 ℃, and the dephosphorization pressure is more than or equal to 340 bar; the finishing temperature is controlled at 850 ℃, and the coiling temperature is controlled at 575 ℃.
In the pickling and galvanizing process, two pickling tanks are arranged, wherein the two pickling tanks comprise a No. 1 tank and a No. 2 tank, the concentration of the acid in the No. 1 tank is 65g/l, and the total acidity of the No. 1 tank is 195g/l, and the acid temperature is 80 ℃; the total acid of the No. 2 groove is 205g/l, and the acid temperature is 75 ℃; the temperature of the water in the rinsing section is 53 ℃.
After the rolled plate is rinsed, carrying out leveling and finishing operations; the elongation of the scale breaker is controlled to be 0.5%, the elongation of the leveler is controlled to be 3.0%, the elongation of the temper mill is controlled to be 4.0%, the elongation of the tension leveling is controlled to be 0.4%, and the total elongation is controlled to be 7.9%. The pot-entering temperature of the galvanizing zinc pot is controlled to be 480-520 ℃, the temperature of zinc liquid is controlled to be 465 +/-5 ℃, and the content of AL% is controlled to be 0.2-0.25. The galvanizing furnace and the zinc pot are heated by adopting induction coils, and heat is generated under the thermal effect of current to heat the rolled plate.
S350GD + Z hot dip galvanized sheet of example 41.2 mm was obtained.
Example 5
A process for producing 1.0mm S350GD + Z hot galvanizing products comprises a continuous casting and rolling process and an acid pickling and galvanizing process; in the continuous casting and rolling process, a steel ladle is continuously cast, roughly rolled, inductively heated, dephosphorized under high pressure, finely rolled, cooled by laminar flow and coiled by a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the raw material components of the continuous casting and rolling process comprise the following components in percentage by weight: 0.038% of C, 0.038% of Si, 0.077% of Mn, 0.009% of P, 0.00012% of S, 0.039% of Alt, and the balance of Fe and inevitable impurities; and the pickling and galvanizing process comprises the steps of breaking phosphorus, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawing, roller coating passivation and coiling through a pickling and galvanizing production line to obtain the hot galvanized coil.
In the continuous casting and rolling process, the thickness of a rough rolling plate blank is controlled to be 10.0mm in an intermediate blank stage, and the thickness of a finished product stage is controlled to be 14 mm; the thickness of the plate blank in the rough rolling area is 1.0mm, the temperature difference between the R1 inlet temperature plate and the plate is less than or equal to 35 ℃, and the R3 outlet temperature is 1000 ℃; the temperature of an IH outlet in the induction heating furnace is controlled at 1108 ℃, and the dephosphorization pressure is more than or equal to 340 bar; the finishing temperature is controlled to 855 ℃, and the coiling temperature is controlled to 580 ℃.
In the pickling and galvanizing process, two pickling tanks are arranged, wherein the two pickling tanks comprise a No. 1 tank and a No. 2 tank, the acid concentration of the No. 1 tank is 72g/l, and the total acidity of the No. 1 tank is 193g/l, and the acid temperature is 83 ℃; the total acidity of the No. 2 groove is 201g/l, and the acid temperature is 78 ℃; the water temperature of the rinsing section is 60 ℃.
After the rolled plate is rinsed, carrying out leveling and finishing operations; the elongation of the scale breaker is controlled to be 0.5%, the elongation of the leveler is controlled to be 3.0%, the elongation of the temper mill is controlled to be 4.0%, the elongation of the tension leveling is controlled to be 0.4%, and the total elongation is controlled to be 7.9%. The pot-entering temperature of the galvanizing zinc pot is controlled to be 480-520 ℃, the temperature of zinc liquid is controlled to be 465 +/-5 ℃, and the content of AL% is controlled to be 0.2-0.25. The galvanizing furnace and the zinc pot are heated by adopting induction coils, and heat is generated under the thermal effect of current to heat the rolled plate.
S350GD + Z hot dip galvanized sheet of example 51.0 mm was obtained.
Analysis of experiments
The raw material components of the continuous casting and rolling processes of examples 1 to 5 were arranged in weight percent to obtain table 1.
Table 1 shows the raw material composition of the continuous casting and rolling process of examples 1 to 5
| Examples | C | Si | Mn | P | S | Alt |
| 1 | 0.036 | 0.039 | 0.087 | 0.012 | 0.00079 | 0.025 |
| 2 | 0.035 | 0.039 | 0.077 | 0.012 | 0.00087 | 0.026 |
| 3 | 0.042 | 0.042 | 0.082 | 0.013 | 0.00027 | 0.029 |
| 4 | 0.038 | 0.038 | 0.077 | 0.009 | 0.00120 | 0.039 |
| 5 | 0.038 | 0.038 | 0.077 | 0.009 | 0.00120 | 0.039 |
The main parameters of the continuous casting and rolling process of examples 1 to 5 were collated to obtain Table 2.
Table 2 shows the main parameters of the continuous casting and rolling process of examples 1 to 5
The main parameters of the acid pickling galvanization process of examples 1 to 5 are collated to obtain Table 3.
Table 3 shows the main parameters of the acid pickling galvanization process of examples 1 to 5
The mechanical properties of the products of examples 1-5 were tested to give Table 4.
Table 4 shows the mechanical properties of the products of examples 1 to 5
| Examples | Thickness mm | Yield strength | Tensile strength | Elongation percentage |
| 1 | 2 | 365 | 432 | 26.5 |
| 2 | 1.8 | 364 | 442 | 27.5 |
| 3 | 1.5 | 379 | 427 | 21.0 |
| 4 | 1.2 | 386 | 427 | 21.0 |
| 5 | 1 | 412 | 442 | 20.5 |
Average performance: the yield strength is 375MPa, the tensile strength is 430MPa, and the elongation is 20 percent; the product meets the requirements of performance standard: the yield strength is more than or equal to 350 MPa; tensile strength MPa: not less than 420 MPa; the elongation A80 after fracture is more than or equal to 16 percent.
Although the present invention has been described in detail by way of examples, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A process for producing S350GD + Z hot galvanizing products with the thickness of less than 2.0mm is characterized in that: comprises a continuous casting and rolling process and an acid pickling and galvanizing process; in the continuous casting and rolling process, a steel ladle, continuous casting, rough rolling, induction heating, high-pressure dephosphorization, finish rolling, laminar cooling and coiling are carried out by a full-endless thin slab continuous casting and rolling production line to obtain a hot-rolled coiled plate; the raw material components of the continuous casting and rolling process comprise the following components in percentage by weight: less than or equal to 0.045% of C, 0.030% -0.045% of Si, 0.05% -0.11% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0030% of S, 0.025% -0.045% of Alt, and the balance of Fe and inevitable impurities; the pickling galvanizing process comprises the steps of breaking phosphorus, pickling, rinsing, leveling, induction heating, galvanizing, finishing, straightening and withdrawal, roller painting passivation and coiling through a pickling galvanizing production line to obtain the hot galvanizing coil.
2. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: in the continuous casting and rolling process, the thickness of a rough rolling plate blank is controlled to be 9.5mm-14.0mm in the intermediate blank stage, and the thickness of a finished product is controlled to be 1.0mm-2.0mm in the finished product stage.
3. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: in the continuous casting and rolling process, the thickness of the plate blank in the rough rolling area is less than or equal to 2.0, the temperature difference between the R1 inlet temperature plate and the plate is less than or equal to 35 ℃, and the R3 outlet temperature is more than 980 ℃.
4. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: in the continuous casting and rolling process, the temperature of an IH outlet in an induction heating furnace is controlled to be 1110-1190 ℃, and the dephosphorization pressure is more than or equal to 340 bar; when the thickness of the finished product is more than 1.2mm and more than or equal to 2mm, the finishing rolling temperature is controlled to be 840 +/-20 ℃, and the coiling temperature is controlled to be 550 +/-10 ℃.
5. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: the continuous casting and rolling process comprises the following steps: when the thickness of the finished product is more than or equal to 1.2mm and more than or equal to 1.0mm, the finishing rolling temperature is controlled to be 840 +/-20 ℃, and the coiling temperature is controlled to be 570 +/-10 ℃.
6. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: the acid pickling galvanizing process comprises the following steps: the pickling tanks are two and comprise a No. 1 tank and a No. 2 tank, wherein the No. 1 tank has the acid concentration of 60-80g/L, the total acidity is more than or equal to 180g/L, and the acid temperature is 80-85 ℃; the rinsing temperature of the rinsing section is 45-60 ℃.
7. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: in the pickling galvanizing process, after the rolled plate is rinsed, leveling and finishing operations are carried out; the elongation of the scale breaker is controlled to be 0.5-0.7%, the elongation of the leveler is controlled to be 3.0-3.5%, the elongation of the finishing mill is controlled to be 4.0%, the elongation of the pulling and straightening mill is controlled to be 0.3-0.5%, and the total elongation of the leveling mill is controlled to be 7.8-8.5%.
8. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: the acid pickling galvanizing process comprises the following steps: the pot-entering temperature of the galvanizing zinc pot is controlled to be 480-520 ℃, the temperature of zinc liquid is controlled to be 465 +/-5 ℃, and the content of AL% is controlled to be 0.2-0.25.
9. The process for producing the S350GD + Z hot-dip galvanized product with the thickness of 2.0mm or less according to claim 1, wherein the process comprises the following steps: the acid pickling galvanizing process comprises the following steps: the galvanizing furnace and the zinc pot are heated by adopting induction coils, and heat is generated under the heat effect of current to heat the rolled plate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112246882A (en) * | 2020-09-29 | 2021-01-22 | 武汉钢铁有限公司 | Method for eliminating hot-dip galvanized transverse stripes of hot-rolled substrate |
| CN113549837A (en) * | 2021-07-29 | 2021-10-26 | 日照钢铁控股集团有限公司 | Production method of SS50-1 high-strength galvanized plate |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112246882A (en) * | 2020-09-29 | 2021-01-22 | 武汉钢铁有限公司 | Method for eliminating hot-dip galvanized transverse stripes of hot-rolled substrate |
| CN113549837A (en) * | 2021-07-29 | 2021-10-26 | 日照钢铁控股集团有限公司 | Production method of SS50-1 high-strength galvanized plate |
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