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WO2016047840A1 - Tôle d'acier laminée et procédé de production associé - Google Patents

Tôle d'acier laminée et procédé de production associé Download PDF

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Publication number
WO2016047840A1
WO2016047840A1 PCT/KR2014/009415 KR2014009415W WO2016047840A1 WO 2016047840 A1 WO2016047840 A1 WO 2016047840A1 KR 2014009415 W KR2014009415 W KR 2014009415W WO 2016047840 A1 WO2016047840 A1 WO 2016047840A1
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Prior art keywords
steel sheet
rolled steel
elongation
rolling
boron
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Ceased
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PCT/KR2014/009415
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English (en)
Korean (ko)
Inventor
김영하
강용식
제복내
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Posco Holdings Inc
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Posco Co Ltd
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Filing date
Publication date
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Publication of WO2016047840A1 publication Critical patent/WO2016047840A1/fr
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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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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

Definitions

  • the present invention relates to a rolled steel sheet and a method for manufacturing the same, and more particularly, to a low carbon steel base rolled steel sheet and a method for producing the same by optimizing the steel components and operating conditions to improve material aging and workability.
  • steel sheets used in home appliances and automobiles there must be a property of preventing processing defects due to aging, and thus, steel sheets used in home appliances and automobiles have been used as materials such as ultra low carbon steel containing carbonitride-forming elements having excellent aging resistance. .
  • steel sheets used in home appliances and automobiles are required for bending resistance and workability, etc., and in the case of automotive steel sheets, the steel sheet is prevented from being oxidized due to outside conditions and paint is used to obtain a desired surface color. Since organic matter is coated, management of surface properties of the steel sheet has become an important management factor in terms of paintability.
  • Flucting refers to a phenomenon in which a processed portion at the time of machining is bent into a diamond shape, and when the bending occurs, it is difficult to maintain the shape of the molded part, and thus the bending should be strictly limited in the actual process.
  • Japanese Laid-Open Patent Publication No. 1989-282420 name of the invention: a method of manufacturing a hot rolled steel sheet for processing and a process heat treatment method of a hot rolled steel sheet
  • an ultra low carbon steel base for producing a steel sheet suitable for a high strength member for automobile or industrial equipment.
  • a method for producing a hot rolled steel sheet excellent in workability and aging is disclosed by adding titanium (Ti), niobium (Nb), and some rare earth elements.
  • this method helps to suppress processing defects such as bending by adding carbonitride-forming elements as described above, but decreases productivity due to increased steelmaking time for high clarity and increases production cost by adding expensive alloying elements. There is a problem.
  • Korean Patent Publication No. 1996-23130 name of the invention: a method for manufacturing a high-temperature hot rolled steel sheet having excellent aging resistance
  • a method of improving aging resistance by hot rolling in a temperature range above the Ar 3 transformation point and coarsening ferrite grains is disclosed.
  • Japanese Laid-Open Patent Publication No. 2008-190008 name of the invention: a method for producing a hot rolled steel sheet having excellent aging resistance
  • Hot-rolled steel slabs containing iron and Fe and other unavoidable impurities, cooled to below 400 ° C with an average cooling rate of 60 ° C / s or more, and after winding t / R ⁇ 0.0055 a method of performing a temper rolling (Skin Pass Mill; SPM) having an elongation rate of 0.1 to 1.0% using a small diameter roll satisfying a roll diameter) is disclosed.
  • FGS Ferrite Grain Size
  • the rolled steel sheet according to the present invention is characterized by having a yield point (YP) of 200 to 250 and a yield point-stretching (YP-EL) of 0.01 to 0.05.
  • the low carbon steel satisfies an elongation of 0.7 to 1.6% with respect to the material thickness 0.4 ⁇ T ⁇ 2.4.
  • the manufacturing method of the rolled steel sheet which concerns on another aspect of this invention is carbon (C): 0.035-0.08, silicon (Si): 0.01-0.03, manganese (Mn): 0.15-0.5, phosphorus (P): 0.001-0.015, sulfur (S): 0.001-0.015, solution-aluminum (Sol.-Al): 0.01-0.04, nitrogen (N) 1-40 ppm, residual iron (Fe) and other unavoidable impurities, and boron ( B) forming a steel slab made of low carbon steel added with 1 to 60 ppm; Manufacturing a hot rolled steel sheet by performing a hot rolling process including finishing rolling, cooling, and winding steps on the steel slab; Manufacturing a cold rolled steel sheet by sequentially performing steps of pickling, cold rolling, and continuous annealing of the hot rolled steel sheet; And tempering rolling the continuously annealed cold rolled steel sheet under conditions satisfying an elongation of 0.7 to 1.6% with respect to a material thickness of
  • the finishing rolling is characterized in that it proceeds in a temperature range of 850 ⁇ 950 °C.
  • the cooling is characterized in that it proceeds at a cooling rate of 60 ⁇ 120 °C per second.
  • the said winding is characterized by advancing in the temperature range of 540-640 degreeC.
  • the cold rolling is characterized in that the cold rolling ratio is set to 50 to 90%.
  • the continuous annealing is characterized in that carried out in a temperature range of 720 ⁇ 810 °C.
  • the temper rolling is characterized in that the progress to the conditions that satisfy the elongation according to the following material thickness.
  • the present invention forms a steel slab by adding a certain amount of boron (B) to the components of low carbon steel, and in the hot rolling and cold rolling treatment of the steel slab, finishing rolling and winding in the hot rolling process, and continuous annealing and tempering in the cold rolling process Optimize rolling conditions.
  • B boron
  • the present invention can improve the material aging and workability through the precipitation of the employment elements, so, the present invention can provide a high value-added rolled steel sheet used in home appliances and automobiles.
  • FIG. 1 is a micrograph showing the structure of a rolled steel sheet made of a general low carbon steel without boron (B) added.
  • Figure 2 is a micrograph showing the structure of the rolled steel sheet made of boron (B) addition low carbon steel according to the present invention.
  • FIG 3 is a graph showing the yield point (YP) of a rolled steel sheet made of boron (B) -added low carbon steel prepared according to the present invention and a rolled steel sheet made of ordinary low carbon steel without boron (B) added thereto.
  • YP-EL yield-stretch
  • Carbon (C) is an element added to improve the strength of the steel sheet. As the content increases, the tensile and yield strength increases, but when added excessively, the upper limit is 0.08% by weight because the workability of the material decreases and the bending resistance decreases. Restrict. On the other hand, when the carbon (C) content is less than 0.035% by weight, not only additional operating time is required for decarburization during steelmaking, but also it is difficult to secure stable materials such as target strength. Therefore, the content of carbon (C) is 0.035 to 0.08 wt%.
  • Silicon (Si) is a useful element that can improve the strength without lowering the ductility of the steel sheet. Silicon (Si) contributes to strength as a ferrite stabilizing element employed in ferrite and promotes martensite formation by encouraging carbon enrichment with unmodified austenite. When the silicon (Si) is added in less than 0.01% by weight, it is difficult to secure the martensite fraction, whereas when added in excess, the upper limit is 0.03% by weight because it causes surface defects and degrades the coating adhesion. Limited to
  • Manganese (Mn) is an element widely used as a solid solution strengthening element. It is an important element for increasing the strength of steel and improving hot workability, but is an element that inhibits the ductility and workability of a material due to MnS formation. If the content of the manganese (Mn) is small, the workability is improved, but it is difficult to secure the strength, it should be added 0.15% by weight or more to secure the target strength. On the other hand, excessive addition of manganese (Mn) not only causes economic deterioration and central segregation caused by the addition of a large amount of alloying elements, but also deteriorates weldability, so the upper limit is limited to 0.5% by weight.
  • Phosphorus (P) is an element that serves to improve the strength and corrosion resistance of steel, and it is preferable to add a large amount in order to secure such characteristics, but the element that causes central segregation during casting is a factor that lowers workability when added in large quantities. This content is limited to 0.015% by weight or less. On the other hand, if the content of phosphorus (P) is less than 0.001% by weight, it is difficult to secure strength and corrosion resistance, so the content is 0.001 to 0.015% by weight.
  • S Sulfur
  • Mn manganese
  • S sulfur
  • S combines with manganese (Mn) in steel to form non-metallic inclusions that serve as a starting point for corrosion, as well as acting as a factor of red brittleness, so it is desirable to reduce its content as much as possible. Therefore, the content of sulfur (S) is 0.001 to 0.015% by weight.
  • Aluminum (Al) is generally an element added for deoxidation of molten steel, but has an aspect of improving aging characteristics by combining with solid solution in steel. Therefore, aluminum (Al) is added in a solution-aluminum (Sol.-Al) state, but the lower limit thereof is limited to 0.01% by weight, and when excessively added, the amount of inclusions in the steel is increased, leading to surface defects and degrading workability. Therefore, the upper limit is limited to 0.04% by weight.
  • Nitrogen (N) is an element that is useful in reinforcing materials while being in a solid solution in steel, but since it is a main element causing aging, it is necessary to manage it to a certain amount or less to secure workability, and therefore, the upper limit of addition is limited to 40 ppm. On the other hand, if the addition amount of nitrogen (N) is less than 1 ppm, sufficient rigidity cannot be obtained, and the site for forming precipitates is reduced, so the lower limit of the addition is limited to 1 ppm, and the content is 1 to 40 ppm.
  • Boron (B) is a grain boundary strengthening element, which improves the fatigue properties of welds, prevents grain boundary brittleness of phosphorus (P), and improves high temperature ductility in steels with high content of aluminum (Al) and silicon (Si).
  • boron (B) increases the quenching of the steel, and has the effect of delaying the perlite transformation of austenite and the ferrite reverse transformation of martensite by diffusing to grain boundaries during heat treatment.
  • the boron (B) is added in an excessive amount, the solid solution boron is increased to reduce the elongation, and boron (B) can diffuse on the surface to reduce the plating property, the addition amount is 1 to 60ppm.
  • boron (B) is an element that combines with a solid solution element in steel to improve the aging property and also increases the strength of the material even by adding a small amount as a hardenability enhancing element. At least 1 ppm addition is required. However, if the content exceeds 60ppm, not only does it cause deterioration of material and grain boundary cracking, but also roughens the surface of the hot-rolled steel sheet. Therefore, the content is limited to 1 to 60ppm.
  • boron (B) is added to the low carbon steel of the above-described components, BN is precipitated using MnS precipitate as a seed during the performance and hot rolling, and Precipitation of cementite is encouraged, resulting in reduction of solid solution nitrogen (N) and carbon (C) through refinement and randomization of cementite.
  • N solid solution nitrogen
  • C carbon
  • the precipitation of BN occurs in finishing rolling, in the case of the present invention, the addition of boron (B) enables the BN precipitation at a lower finishing rolling temperature than before, thereby producing a larger amount of BN precipitates than before.
  • the rolled steel sheet according to the present invention can be suppressed from the generation of grains by grain refinement. That is, in the rolled steel sheet according to the present invention, as BN is precipitated at the austenite grain boundary through addition of boron (B), the grain boundary stabilization effect is obtained, and the ferrite transformation is also suppressed in the austenite region. The occurrence of the mixing can be suppressed.
  • the low carbon steel containing a small amount of manganese (Mn) increases the Ar 3 transformation point to promote mixing, and the addition of the transformation delay element is necessary to prevent such mixing.
  • Rolled steel sheet of the present invention can be suppressed by the addition of a certain amount of boron (B) which can play a role of transformation delay element to the components of low carbon steel, as a result, the rolled steel sheet according to the present invention through the suppression of such Silver material aging and poor machining can be improved.
  • the rolled steel sheet according to the present invention adds boron (B) and nitrogen (N) in the steel component to satisfy the conditions of 0.2 ⁇ [B / N] ⁇ 1.1 in order to secure appropriate processing characteristics. This is because if the B / N value is less than 0.2, the bending resistance at room temperature is deteriorated due to excessive solid solution in steel, and the grain restraining effect is insufficient at high temperature, while if the B / N value is over 1.1, the ductility is lowered and the workability is reduced. to be. Therefore, the rolled steel sheet according to the present invention limits the value of B / N in the range 0.2 to 1.1.
  • an embodiment of the present invention performs a hot rolling process in the austenitic region for the steel slab made of the above-described composition components and a certain amount of boron (B) is added.
  • finishing rolling is carried out at a temperature of 850 ⁇ 950 °C, this is, when the finishing rolling temperature is less than 850 °C as the hot rolling is finished in the low temperature region, the crystallization of the grain proceeds rapidly, leading to the deterioration of rollability and workability.
  • the finishing rolling temperature is higher than 950 ° C, since uniform hot rolling is not performed throughout the thickness, grain refinement is not sufficiently achieved, resulting in a drop in impact toughness due to grain coarsening. Therefore, in the Example of this invention, a finishing rolling temperature shall be 850-950 degreeC.
  • Cooling is carried out at the cooling rate of 60-120 degreeC per second in the run-out table (ROT) of steel by which it rolled.
  • ROT run-out table
  • the winding of the hot rolled steel sheet proceeds at a temperature of 540 to 640 ° C.
  • the coiling temperature in the hot rolling process is a temperature for obtaining a structure capable of securing the optimum mechanical properties after the subsequent cold rolling and continuous annealing step, in the case of the rolled steel sheet according to the present invention, if the coiling temperature is less than 540 °C Cold rolling is difficult due to the formation of bainite or martensite structure, and if the temperature exceeds 640 ° C., the final microstructure is coarsened to reduce workability and corrosion resistance, and it is difficult to manufacture a steel sheet having sufficient strength. Therefore, the coiling temperature of the hot rolled steel sheet in the embodiment of the present invention is 540 ⁇ 640 °C.
  • a pickling step and a cold rolling step are sequentially performed on the hot rolled steel sheet obtained through the hot rolling process, and then a continuous annealing step and temper rolling are performed to produce a rolled steel sheet according to the present invention, which is made of a cold rolled steel sheet based on a low carbon steel. do.
  • cold rolling advances with 50-90% of cold rolling rates.
  • Cold rolling deforms the hot rolled tissue, where the strain energy that deforms the tissue becomes energy in subsequent continuous annealing, that is, recrystallization.
  • the cold rolling is less than 50% cold rolling, the effect of the deformation of the tissue is small.
  • the cold rolling is more than 90%, the cold rolling process itself is not very difficult, and the precipitates produced in the hot rolled steel sheet are cold rolled.
  • the development of (100) texture in the early stages of subsequent recrystallization during decomposing deteriorates the drawability, cracks at the edges of the steel sheet, and the probability of breakage in the steel sheet is high. Accordingly, cold rolling controls the cold reduction rate at 50 to 90%.
  • Continuous annealing is performed for 10 to 120 seconds in the temperature range of 720 to 810 ° C.
  • the rolled steel sheet to which boron (B) is added precipitates most of the nitrogen (N) to BN in the hot rolling process, grains are coarsened by decreasing AlN precipitation in the continuous annealing step, and coarsening of grains is lowered in yield point (YP)
  • the annealing temperature must be lowered, and the lowering of the annealing temperature leads to an improvement in productivity.
  • heat treatment below 720 ° C. results in insufficient recrystallization
  • heat treatment above 810 ° C. causes material degradation due to high temperature annealing.
  • the continuous annealing temperature is set to 720 to 810 ° C.
  • Temper rolling is carried out to satisfy the elongation of 0.7 to 1.6% with respect to the material thickness 0.4 ⁇ T ⁇ 2.4, but in the range satisfying the elongation by material thickness as shown in the following Equation 1, Equation 2, Equation 3 and Equation 4. .
  • temper rolling in the embodiment of the present invention is carried out by setting the elongation reference for each material thickness based on the relationship 1, relationship 2, relationship 3 and relationship 4.
  • the steel sheet specimens of the low carbon steel base were prepared with the compositions shown in Table 1 and the operating conditions shown in Table 2, for each specimen The mechanical properties are listed in Table 3.
  • Inventive Examples 1 to 4 are low carbon steel base rolled steel sheets to which boron (B) is added, and Comparative Examples 1 to 4 are low carbon steel base rolled steel sheets to which boron (B) is not added. .
  • Inventive Examples 1 to 4 and Comparative Examples 1 to 4 satisfy all of the operating conditions according to the embodiment of the present invention.
  • Inventive Examples 1 to 4 exhibited good aging resistance because boron (B) was added to the components of low carbon steel so that no yield point-stretching and no bending occurred during processing. Good workability and paintability, such as no cracking, occurred during bending.
  • Comparative Example 1 showed a result that the change in yield point-stretch occurred, the workability and paintability is normal, and the aging resistance is poor. Comparative Example 2 In addition, due to the change in yield point-stretch, poor workability and paintability and normal aging resistance were shown. In Comparative Example 3, no change in yield point-stretching occurred, but the aging resistance and workability were normal, and the paintability was poor. In Comparative Example 4, due to the change in yield point-stretch, the workability was poor, and the aging resistance and paintability were normal.
  • the low carbon steel-based rolled steel sheet to which boron (B) is added is improved in material aging and processing defects as compared with the general low carbon steel-based rolled steel sheet without boron. can see.
  • FIG. 1 and 2 are micrographs showing the structure of the rolled steel sheet made of a general low carbon steel without boron (B) added and the rolled steel sheet made of boron (B) -added low carbon steel according to the present invention, respectively,
  • FIG. And Fig. 4 shows the yield point (YP) and the yield-point (YP-) of the rolled steel sheet made of boron (B) -added low carbon steel and the rolled steel sheet made of ordinary low-carbon steel without boron (B), respectively prepared according to the present invention.
  • EL graphs.
  • the particle size index (FGS) is 10 to 11, that is, the average diameter of the particles is 0.007 to 0.011 mm. It can be seen that a coarse structure of coarse grains having an average number of fragments on the measurement line of 100 to 141 / mm occurred.
  • the boron (B) is added, in the case of the rolled steel sheet made of low carbon steel according to the present invention manufactured according to the optimized operating conditions, the particle size index is 9 to 10, that is, the average diameter of the particles Is 0.011 to 0.015 mm and the average number of sections on the measurement line is 70.7 to 100 / mm, similar to the rolled steel sheet without boron (B) added, but it can be seen that the grains are uniformly formed with little mixed structure. .
  • the rolled steel sheet made of general low carbon steel without boron exhibits a yield point (YP) of about 280 and a yield point-stretching (YP-EL) of about 0.31. have.
  • the FGS is fine and the size of the grains is uniform without generation of a mixed structure.
  • the yield point (YP) 200 to 250, preferably 240
  • the yield point-elongation (YP-EL) 0.01 to 0.05, preferably 0.03, are lower than that of the general low carbon steel without B).
  • the rolled steel sheet according to the present invention manufactured according to the optimized operating conditions with boron (B) added through the growth of uniform grains. It can be seen that it has a relatively low yield point (YP) and yield point-stretching (YP-EL), from this result, it can be seen that the rolled steel sheet according to the present invention is improved in material aging and workability by reducing the potential adhesion.
  • YP yield point
  • YP-EL yield point-stretching
  • the rolled steel sheet made of low carbon steel according to the present invention in which boron (B) is added and manufactured through hot rolling and cold rolling processes according to optimized operating conditions, has good properties in both workability, aging resistance, paintability and corrosion resistance. And, material aging and processing failure is improved, and as a result, the present invention can provide a high value-added rolled steel sheet having excellent material properties and workability used in home appliances and automobiles.

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Abstract

La présente invention concerne une tôle d'acier laminée et un procédé de production associé. La tôle d'acier laminée selon la présente invention est constituée d'acier à faible teneur en carbone contenant 0,035 à 0,08 % en poids de carbone (C), 0,01 à 0,03 % en poids de silicium (Si), 0,15 à 0,5 % en poids de manganèse (Mn), 0,001 à 0,015 % en poids de phosphore (P), 0,001 à 0,015 % en poids de soufre (S), 0,01 à 0,04 % en poids d'aluminium en solution (sol. Al), et 1 à 40 ppm d'azote (N), le reste étant du fer (Fe) et d'autres impuretés inévitables. Une lame d'acier ayant 1 à 60 ppm de bore (B), qui satisfait la condition 0,2 ≤ [B/N] ≤ 1,1, ajoutés à celle-ci est soumise à un laminage de finition à 850 à 950 °C, enroulée à 540 à 640 °C, puis recuite en continu à 720 à 810 °C, et écrouie à froid satisfaisant la condition d'un allongement de 0,7 à 1,6 % par rapport à une épaisseur de matériau de 0,4 ≤ T < 2,4, ce qui permet de former de façon uniforme des grains cristallins ayant une taille de grain (FGS) de 9 à 10.
PCT/KR2014/009415 2014-09-24 2014-10-07 Tôle d'acier laminée et procédé de production associé Ceased WO2016047840A1 (fr)

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CN115138682A (zh) * 2022-04-19 2022-10-04 安阳钢铁集团有限责任公司 一种无铝高硅低碳钢的酸连轧生产方法

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