CN112795849A - 1300Mpa high-toughness hot-dip galvanized steel plate and production method thereof - Google Patents

1300Mpa high-toughness hot-dip galvanized steel plate and production method thereof Download PDF

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CN112795849A
CN112795849A CN202011310891.2A CN202011310891A CN112795849A CN 112795849 A CN112795849 A CN 112795849A CN 202011310891 A CN202011310891 A CN 202011310891A CN 112795849 A CN112795849 A CN 112795849A
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hot
temperature
dip galvanized
galvanized steel
galvanizing
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CN112795849B (en
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冯晓勇
刘靖宝
王朝
田秀刚
谷田
苏然
张�杰
史文礼
霍俊梅
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06Zinc or cadmium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C2/00Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36Elongated material
    • C23C2/40Plates; Strips
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F17/00Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

Abstract

A 1300Mpa high-toughness hot-dip galvanized steel plate and a production method thereof, belonging to the technical field of metallurgy. The steel plate comprises the following chemical components in percentage by mass: 0.1-0.2%, Mn: 1.8-2.5%, S is less than or equal to 0.005%, P is less than or equal to 0.02%, Si is less than or equal to 0.10%, Als: 0.6 to 1.0%, Nb: 0.01 to 0.04%, Ti: 0.02-0.08%, Ni: 1.0-2.0%, and the balance of Fe and inevitable impurities. The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation; in the continuous hot galvanizing process, the dew point of a preheating section is-10 to +20 ℃; the dew point of the heating section 1 is-20 to +10 ℃; the dew point of the heating section 2 is-5 to-30 ℃. The invention can obtain the ferrite and martensite dual-phase steel with the deformation induced plasticity effect, and the steel plate has higher toughness and plasticity and good formability and corrosion resistance.

Description

1300Mpa high-toughness hot-dip galvanized steel plate and production method thereof
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a 1300Mpa high-toughness hot-dip galvanized steel plate and a production method thereof.
Background
In recent years, with the weight reduction, energy saving, environmental protection and the deepening of safety concepts of automobiles, advanced high-strength steel such as dual-phase steel is receiving more and more attention. Currently, high-strength cold-rolled steel sheets have strength levels of 590MPa, 780MPa, 980MPa, 1180MPa, and the like, and are often used for manufacturing automobile structural members, crash barriers, and the like. Meanwhile, the corrosion resistance of the steel for automobiles is more and more concerned, so the research and development of the high-quality hot-dip galvanized dual-phase steel have important significance.
In the production process of the high-strength galvanized steel sheet, due to the addition of Si or Mn in the alloy, the surface of a steel strip is easily enriched and oxidized during annealing, the wettability of galvanization is reduced, the defects of plating leakage and the like are caused, and the spot weldability of a galvanized sheet is deteriorated, so that the addition of Si or Mn in the production process is strictly controlled. Therefore, researching a new component system and making a reasonable hot galvanizing annealing process according to the new component system are the key for determining the surface quality and the mechanical property of the high-strength hot galvanized steel sheet.
Disclosure of Invention
In order to solve the technical problems, the invention provides a 1300Mpa high-toughness hot-dip galvanized steel plate and a production method thereof. The steel plate has simple production process, stable performance and high product qualification rate; has good forming performance, mechanical performance and corrosion resistance.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a1300 Mpa high-toughness hot-dip galvanized steel plate comprises the following chemical components in percentage by mass: 0.1-0.2%, Mn: 1.8-2.5%, S is less than or equal to 0.005%, P is less than or equal to 0.02%, Si is less than or equal to 0.10%, Als: 0.6 to 1.0%, Nb: 0.01 to 0.04%, Ti: 0.02-0.08%, Ni: 1.0-2.0%, and the balance of Fe and inevitable impurities.
The tensile strength of the steel plate is more than or equal to 1300MPa, the yield strength is more than or equal to 850MPa, and the elongation A80 is more than or equal to 7.5 percent.
The production method of the 1300Mpa grade high-toughness hot-dip galvanized steel plate comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation; in the continuous hot galvanizing process, the dew point of a preheating section is-10 to +20 ℃; the dew point of the heating section 1 is-20 to +10 ℃; the dew point of the heating section 2 is-5 to-30 ℃.
In the hot rolling procedure, the heating temperature is 1200-1320 ℃, the heating time is 120-200 min, the finishing temperature is 850-900 ℃, and the coiling temperature is 550-650 ℃.
In the acid rolling process, the reduction rate is more than or equal to 45 percent.
In the continuous hot galvanizing process, the soaking temperature is 760-840 ℃, and the heat preservation time is 100-200 s; slowly cooling at 680-740 ℃ at a slow cooling rate of 10-20 ℃/s; the rapid cooling temperature is 420-450 ℃, and the rapid cooling rate is 35-65 ℃/s; the galvanizing temperature is 458-462 ℃, and the galvanizing time is 5-15 s.
In the finishing and passivating process, the finishing elongation is 0.2-0.6%, and the passivating temperature is 80-120 ℃.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention reduces the content of Mn and Si elements in the steel, optimizes the influence of the Mn and Si elements on the galvanized surface quality and increases the platability of the steel plate; al replaces Mn and Si elements to be added, so that on one hand, the effects of solid solution strengthening, deoxidizing agent and fine grain strengthening are achieved, and more importantly, the martensite transformation can be inhibited, and the austenite is stabilized; the addition of Ni can improve the distribution of carbon in martensite, homogenize the carbon, eliminate the residual strain of martensite phase and improve the plasticity of the martensite, thereby ensuring the hardenability and simultaneously increasing the toughness of steel grades. The invention forms a layer of sponge iron on the surface of the strip steel by adjusting the dew point value of the galvanizing annealing furnace area and pre-oxidizing in a reduction mode, improves the wettability of the strip steel, and effectively hinders the corrosion of a matrix by plating a pure zinc layer on the surface of the strip steel.
The invention can obtain the ferrite-martensite dual-phase steel with the deformation induced plasticity effect through the reasonable combination of component design and production process, and the structure of the steel is characterized in that residual austenite is dispersed and distributed on a martensite matrix, and the steel plate can generate the transformation induced plasticity in the forming process, has higher plasticity and toughness, has the tensile strength of more than or equal to 1300MPa, and has the characteristics of low cost, stable production process, excellent and stable performance of the finished product.
Drawings
FIG. 1 is a metallographic structure of a steel sheet according to example 1 of the present invention;
FIG. 2 is a stress-strain curve of a high toughness hot-dip galvanized steel sheet according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1200 deg.C for 200 min; the finishing temperature is 875 ℃ and the coiling temperature is 561 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 57%;
(3) a continuous galvanizing procedure: the soaking temperature is 800 ℃, and the heat preservation time is 140 s; the slow cooling temperature is 735 ℃, and the slow cooling rate is 12 ℃/s; the fast cooling temperature is 425 ℃, and the fast cooling rate is 62 ℃/s; the galvanizing temperature is 462 ℃, and the galvanizing time is 14 s; the preheating section dew point is 16 ℃; the dew point of the heating section 1 is-12 ℃; the dew point of the heating section 2 is-24 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.3 percent, and the passivation temperature is 83 ℃.
The metallographic structure of the steel plate obtained in this example is shown in fig. 1 (the metallographic structure of the steel plate in other examples is similar to that of fig. 1 and is omitted).
Example 2
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1250 deg.C for 180 min; the finishing temperature is 880 ℃, and the coiling temperature is 550 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 45%;
(3) and (3) a continuous hot galvanizing procedure: the soaking temperature is 760 ℃, and the heat preservation time is 200 s; the slow cooling temperature is 730 ℃, and the slow cooling rate is 20 ℃/s; the fast cooling temperature is 420 ℃, and the fast cooling rate is 60 ℃/s; the galvanizing temperature is 462 ℃, and the galvanizing time is 10 s; the dew point of the preheating section is-10 ℃; the dew point of the heating section 1 is-20 ℃; the dew point of the heating section 2 is-26 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.4 percent, and the passivation temperature is 100 ℃.
Example 3
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1320 deg.C for 120 min; the finishing temperature is 890 ℃, and the coiling temperature is 620 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 51 percent;
(3) and (3) a continuous hot galvanizing procedure: soaking temperature is 800 ℃, and holding time is 175 s; the slow cooling temperature is 740 ℃, and the slow cooling rate is 10 ℃/s; the fast cooling temperature is 450 ℃, and the fast cooling rate is 40 ℃/s; the galvanizing temperature is 459 ℃, and the galvanizing time is 15 s; the preheating section dew point is 20 ℃; the dew point of the heating section 1 is 8 ℃; the dew point of the heating section 2 is-8 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.3 percent, and the passivation temperature is 80 ℃.
Example 4
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1304 deg.C for 130 min; the finishing temperature is 899 ℃, and the coiling temperature is 648 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 66%;
(3) and (3) a continuous hot galvanizing procedure: the soaking temperature is 840 ℃, and the heat preservation time is 110 s; the slow cooling temperature is 690 ℃, and the slow cooling rate is 10 ℃/s; the fast cooling temperature is 450 ℃, and the fast cooling rate is 60 ℃/s; the galvanizing temperature is 461 ℃, and the galvanizing time is 5 s; the preheating section dew point is 13 ℃; the dew point of the heating section 1 is 10 ℃; the dew point of the heating section 2 is-30 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.6 percent, and the passivation temperature is 120 ℃.
Example 5
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1220 deg.C for 140 min; the finishing temperature is 900 ℃, and the coiling temperature is 650 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 55 percent;
(3) and (3) a continuous hot galvanizing procedure: the soaking temperature is 775 ℃, and the heat preservation time is 105 s; the slow cooling temperature is 730 ℃, and the slow cooling rate is 13 ℃/s; the fast cooling temperature is 428 ℃, and the fast cooling rate is 65 ℃/s; the galvanizing temperature is 460 ℃, and the galvanizing time is 5 s; the preheating section dew point is 8 ℃; the heating section 1 has a dew point of 2 ℃; the dew point of the heating section 2 is-13 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.5%, and the passivation temperature is 115 ℃.
Example 6
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1202 deg.C for 200 min; the finishing temperature is 875 ℃ and the coiling temperature is 565 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 57%;
(3) and (3) a continuous hot galvanizing procedure: the soaking temperature is 806 ℃, and the heat preservation time is 138 s; the slow cooling temperature is 735 ℃, and the slow cooling rate is 12 ℃/s; the fast cooling temperature is 425 ℃, and the fast cooling rate is 60 ℃/s; the galvanizing temperature is 462 ℃, and the galvanizing time is 15 s; the preheating section dew point is 16 ℃; the dew point of the heating section 1 is-14 ℃; the dew point of the heating section 2 is-22 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.3 percent, and the passivation temperature is 85 ℃.
Example 7
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1288 deg.C for 154 min; the finishing temperature is 850 ℃, and the coiling temperature is 603 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 46 percent;
(3) and (3) a continuous hot galvanizing procedure: soaking at 833 deg.C for 158 s; the slow cooling temperature is 704 ℃, and the slow cooling rate is 18 ℃/s; the fast cooling temperature is 446 ℃, and the fast cooling rate is 35 ℃/s; the galvanizing temperature is 459 ℃, and the galvanizing time is 7 s; the preheating section dew point is 4 ℃; the dew point of the heating section 1 is-6 ℃; the dew point of the heating section 2 is-17 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.2%, and the passivation temperature is 104 ℃.
Example 8
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1267 deg.C for 196 min; the finishing temperature is 858 ℃, and the coiling temperature is 580 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 52%;
(3) and (3) a continuous hot galvanizing procedure: the soaking temperature is 821 ℃ and the heat preservation time is 100 s; slowly cooling at 722 deg.c and 16 deg.c/s; the fast cooling temperature is 434 ℃, and the fast cooling rate is 52 ℃/s; the galvanizing temperature is 458 ℃, and the galvanizing time is 12 s; the preheating section dew point is-2 ℃; the dew point of the heating section 1 is 0 ℃; the dew point of the heating section is-5 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.5%, and the passivation temperature is 94 ℃.
Example 9
The chemical components and the mass percentage content of the 1300MPa grade high-toughness hot-dip galvanized steel sheet in the embodiment are shown in table 1, and the mechanical properties are shown in table 2.
The production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation, and comprises the following specific steps:
(1) a hot rolling procedure: heating at 1235 deg.C for 171 min; the finishing temperature is 866 ℃ and the coiling temperature is 632 ℃;
(2) acid rolling process: cold rolling is carried out after acid cleaning, and the cold rolling reduction rate is 50%;
(3) and (3) a continuous hot galvanizing procedure: soaking at 787 deg.C for 192 s; the slow cooling temperature is 680 ℃, and the slow cooling rate is 15 ℃/s; the fast cooling temperature is 441 ℃, and the fast cooling rate is 47 ℃/s; the galvanizing temperature is 460 ℃, and the galvanizing time is 8 s; the dew point of the preheating section is-8 ℃; the dew point of the heating section 1 is-4 ℃; the dew point of the heating section 2 is-20 ℃;
(4) and (3) finishing and passivating: the finishing elongation is 0.4 percent, and the passivation temperature is 108 ℃.
TABLE 1 chemical composition and mass% of steel plate of each example
Name (R) C Mn S P Si Als Nb Ti Ni
Example 1 0.19 1.9 0.004 0.012 0.07 0.75 0.030 0.025 1.25
Example 2 0.11 1.8 0.002 0.010 0.10 0.70 0.035 0.035 1.40
Example 3 0.15 2.3 0.003 0.007 0.05 0.65 0.010 0.080 2.00
Example 4 0.10 2.4 0.002 0.006 0.05 0.80 0.015 0.020 1.00
Example 5 0.13 2.0 0.005 0.009 0.02 1.00 0.040 0.040 1.65
Example 6 0.20 2.5 0.001 0.007 0.08 0.60 0.037 0.045 1.80
Example 7 0.12 2.0 0.005 0.017 0.03 0.94 0.028 0.053 1.93
Example 8 0.17 2.1 0.004 0.020 0.06 0.71 0.019 0.072 1.35
Example 9 0.16 2.5 0.002 0.015 0.04 0.88 0.023 0.065 1.09
Table 2. test condition table for mechanical properties of steel plates of each example
Name (R) Rm /MPa Rel /MPa A80 /%
Example 1 1395 928 8.0
Example 2 1322 881 8.5
Example 3 1376 912 8.5
Example 4 1337 887 9.0
Example 5 1361 890 8.0
Example 6 1409 937 7.5
Example 7 1316 875 9.5
Example 8 1328 891 9.0
Example 9 1332 892 9.0

Claims (8)

1. A1300 Mpa high-toughness hot-dip galvanized steel plate is characterized by comprising the following chemical components in percentage by mass: 0.1-0.2%, Mn: 1.8-2.5%, S is less than or equal to 0.005%, P is less than or equal to 0.02%, Si is less than or equal to 0.10%, Als: 0.6 to 1.0%, Nb: 0.01 to 0.04%, Ti: 0.02-0.08%, Ni: 1.0-2.0%, and the balance of Fe and inevitable impurities.
2. The 1300 MPa-grade high-toughness hot-dip galvanized steel plate as claimed in claim 1, wherein the tensile strength of the steel plate is not less than 1300MPa, the yield strength is not less than 850MPa, and the elongation A80 is not less than 7.5%.
3. The production method of the 1300Mpa grade high toughness hot dip galvanized steel sheet according to claim 1 or 2, characterized in that the production method comprises the working procedures of hot rolling, acid rolling, continuous galvanizing, finishing and passivation; in the continuous hot galvanizing process, the dew point of a preheating section is-10 to +20 ℃; the dew point of the heating section 1 is-20 to +10 ℃; the dew point of the heating section 2 is-5 to-30 ℃.
4. The method for producing a 1300MPa grade high-toughness hot-dip galvanized steel sheet according to claim 3, wherein the hot rolling step is performed at a heating temperature of 1200 to 1320 ℃ for a heating time of 120 to 200 min.
5. The method for producing the 1300MPa grade high-toughness hot-dip galvanized steel sheet according to claim 4, wherein the hot rolling process is performed at a finish rolling temperature of 850-900 ℃ and a coiling temperature of 550-650 ℃.
6. The production method of the 1300MPa grade high-toughness hot-dip galvanized steel plate according to claim 5, characterized in that the reduction rate of the acid rolling process is more than or equal to 45%.
7. The production method of the 1300MPa grade high-toughness hot-dip galvanized steel sheet according to any one of claims 3 to 6, characterized in that in the continuous hot-dip galvanizing process, the soaking temperature is 760 to 840 ℃, and the holding time is 100 to 200 s; slowly cooling at 680-740 ℃ at a slow cooling rate of 10-20 ℃/s; the rapid cooling temperature is 420-450 ℃, and the rapid cooling rate is 35-65 ℃/s; the galvanizing temperature is 458-462 ℃, and the galvanizing time is 5-15 s.
8. The method for producing the 1300MPa grade high toughness hot dip galvanized steel sheet according to any one of claims 3 to 6, wherein the finishing and passivating process is performed at a finishing elongation of 0.2 to 0.6% and a passivating temperature of 80 to 120 ℃.
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