WO2001092593A1 - Tole d'acier laminee a froid presentant d'excellentes proprietes de rheodurcissement par vieillissement, et procede de production - Google Patents
Tole d'acier laminee a froid presentant d'excellentes proprietes de rheodurcissement par vieillissement, et procede de production Download PDFInfo
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- WO2001092593A1 WO2001092593A1 PCT/JP2001/001002 JP0101002W WO0192593A1 WO 2001092593 A1 WO2001092593 A1 WO 2001092593A1 JP 0101002 W JP0101002 W JP 0101002W WO 0192593 A1 WO0192593 A1 WO 0192593A1
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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
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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
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- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a cold-rolled steel sheet suitable mainly for use in automobiles, and particularly to a tensile strength
- the present invention relates to a cold-rolled steel sheet having excellent (TS) less than 440 MPa and excellent strain aging hardening properties, and a method for producing the same.
- TS excellent
- steel sheets for automobile bodies from so-called light working to ultra deep drawing
- the cold rolled steel sheet of the present invention is used for applications where relatively low grade and appropriate workability are required. It is suitable.
- the cold-rolled steel sheet of the present invention can be used in a wide range of applications from relatively light working such as forming into a pipe by mild bending or roll forming to relatively severe drawing. It is suitable for
- the steel sheet in the present invention includes a steel strip.
- excellent in strain aging hardening characteristics means that the amount of increase in deformation stress before and after this aging treatment after pre-deformation of 5% tensile strain and aging at a temperature of 170 for 20 minutes.
- BH amount; BH i pre-deformation stress before yield stress treatment after aging treatment
- tensile strength increase before and after strain aging treatment pre-deformation + aging treatment
- a cold-rolled steel sheet for an outer panel is made of an ultra-low carbon steel material, and finally the amount of C remaining in a solid solution state is controlled to an appropriate range. ing.
- This type of steel sheet is kept soft during press forming, ensures shape freezing and ductility, and yield stress using the strain age hardening phenomenon that occurs in the paint baking process at 170 ° C for about 20 minutes performed after press forming. The aim is to secure dent resistance by obtaining a rise in dent.
- C forms a solid solution in the steel and is soft.On the other hand, after press forming, in the coating baking process, the dissolution introduced during press forming is fixed by solid solution C. The yield stress increases.
- baking hardenability can be improved by using a steel sheet with a further increased bake hardening amount using solid solution N or a composite structure consisting of ferrite and martensite. Further improved steel plates have been proposed.
- JP-A-60-52528 discloses that C: 0.02 to 0.15%, Mn: 0.8 to 3.5%, P: 0.02 to 0.15%, A1: 0. Hot rolling of steel containing 10% or less, N: 0.005 to 0.025% at a temperature of 550 ° C or less, and ductility and spot welding in which annealing after cold rolling is controlled cooling heat treatment.
- a method for producing a high-strength thin steel sheet having both good properties is disclosed.
- the steel sheet manufactured by the technique described in Japanese Patent Application Laid-Open No. 60-52528 has a mixed structure composed of a low-temperature transformation product phase mainly composed of a fluoride and martensite, has excellent ductility, and has a positive effect. The purpose is to obtain high strength by using strain aging during baking of paint by N added to steel.
- Japanese Patent Publication No. 5-24979 discloses that C: 0.08 to 0.20%, Mn: 1.5 to 3.5%, the composition of which consists of the balance Fe and unavoidable impurities.
- a bake-hardenable high-tensile cold-rolled thin steel sheet composed of uniform bainite with a ferrite content of 5% or less or bainite partially containing martensite.
- the structure of the cold-rolled steel sheet described in Japanese Patent Publication No. 5-24979 is obtained by rapidly cooling the temperature range of 400 to 200 ° C in the cooling process after continuous annealing, and then gradually cooling it after that. As an organization mainly composed of inat, it aims to obtain a higher bake hardening amount than ever before.
- the present invention overcomes the limitations of the prior art described above, has moldability and stable quality characteristics, and after molding into an automobile part, has sufficient strength as an automobile part and is sufficiently reduced in weight of an automobile body. It is an object of the present invention to provide a cold-rolled steel sheet which can contribute to the steel sheet and has excellent strain aging hardening characteristics, and a method for manufacturing these steel sheets industrially at low cost.
- Strain aging hardening characteristics are targeted at a BH amount of 80 MPa or more and a TS of 40 MPa or more under aging conditions of preserving 5% tensile strain and preserving 20ndn at a temperature of 170. Disclosure of the invention
- the present inventors manufactured steel plates with various compositions and manufacturing conditions, and conducted many material evaluation experiments. As a result, by taking advantage of the large strain age hardening phenomenon developed by the action of N as a strengthening element, N, which has been rarely used so far in fields where high workability is required. In addition, they have found that it is possible to easily achieve both improvement in moldability and high strength after molding.
- the present inventors have found that, in order to advantageously utilize the strain age hardening phenomenon due to N, the strain age hardening phenomenon due to N is advantageously combined with the baking conditions of automobiles or the heat treatment conditions after molding more positively. It has been found that it is effective to control the microstructure and the solute N content of the steel sheet within a certain range by optimizing the hot rolling conditions, cold rolling, and cold rolling annealing conditions. Was. We also found that it is important to control the A1 content according to the N content in terms of composition in order to stably develop the strain age hardening phenomenon due to N.
- the present inventors have made the microstructure of the steel sheet into a main phase of graphite and an average grain size of 15 / zm or less, thereby eliminating the conventional problem of deterioration due to aging at room temperature and reducing N. I found that it can be fully utilized.
- the present inventors use N as a strengthening element, control the A1 content in an appropriate range according to the N content, and optimize the hot rolling conditions, cold rolling, and cold rolling annealing conditions, By optimizing the visual structure and the solute N, the formability is much better than that of conventional solid-solution strengthened C-Mn-based steel sheets and precipitation-strengthened steel sheets. It has been found that a steel sheet having aging hardening characteristics can be obtained.
- the steel sheet of the present invention has a higher strength after a paint baking treatment by a simple tensile test than a conventional steel sheet, and has a higher strength when subjected to plastic deformation according to actual pressing conditions. Small variation and stable component strength characteristics can be obtained.
- the part where the plate thickness is reduced due to large strain tends to be more uniform than the other parts when evaluated by the load capacity of (plate thickness) X (strength), and the strength as a part is stable. It does.
- the present invention has been completed based on the findings described above and further studied. That is, in the first invention, in mass%, C: 0.15% or less, Si: 0.4% or less, Mn: 2.0% or less, P: 0.04% or less, S: 0.02% or less, A1: 0.02% or less, N : Include 0.0050-0.025%, and replace Si, Mn and P with the following equation (1)
- NZA1 is 0.3 or more
- N in solid solution is 0.0010% or more
- the balance is composed of Fe and unavoidable impurities, and is composed of a fluoride phase and a parity phase.
- the ferrite phase has an area ratio of 90% or more and an average crystal grain size of 15 ⁇ m or less, and has a tensile strength of less than 440 MPa, a yield ratio of less than 70% YR, and strain aging. It is a cold-rolled steel sheet having excellent hardening characteristics, preferably having a thickness of 3.2 mm or less.
- Group a One or two or more of Cu, Ni, Cr, Mo are less than 1.0% in total
- Group b One or more of Nb, Ti, V are 0.1% or less in total
- Group c Ca or RE 1 or 2 types in total 0.0010 to 0.010%
- C 0.15% or less
- Si 0.4% or less
- Mn 2.0% or less
- P 0.04% or less
- S 0.02% or less
- A1 0.02% or less
- N 0.0050-0.025 including 5%
- a hot rolling step of forming a rolled hot rolled sheet a cold rolling step of pickling and cold rolling the hot rolled sheet to form a cold rolled sheet; ⁇ Holding time at the following temperature: Annealing for 10 to 120 s, then cooling rate to the temperature range of 500 or less Cooling after annealing at 10 to 300 s, or even 350 to 500 ° C
- temper rolling or leveler processing at an elongation of 1.0 to 15% subsequent to the cold rolling and sheet annealing steps.
- C is an element that increases the strength of a steel sheet.
- C is contained in an amount of 0.005% or more.
- the carbide fraction in the steel sheet becomes excessive, and the ductility is remarkably reduced, the formability is deteriorated, and the spot is further reduced. Weldability, arc weldability, etc. are significantly reduced.
- the content is preferably set to 0.08% or less, and to 0.05% or less for applications requiring better ductility.
- Si is a useful element that can increase the strength of a steel sheet without remarkably reducing the ductility of the steel.
- the content of Si is 0.005% or more.
- Si is an element that significantly raises the transformation point during hot rolling and makes it difficult to ensure quality and shape, or has an adverse effect on the beauty of the steel sheet surface such as surface properties and chemical conversion properties. In the invention, it is limited to 0.4% or less. If the Si content is 0.4% or less, a remarkable increase in the transformation point can be suppressed by adjusting the amount of Mn added in combination, and good surface properties can be secured. In particular, when aesthetics are required, the content is preferably 0.2% or less.
- Mn is an effective element for preventing hot cracking due to S, and is preferably added according to the amount of S contained. Further, Mn has a great effect on the refinement of crystal grains, which is an important component of the present invention, and it is preferable that Mn is positively added and used for improving the material quality. From the viewpoint of stably fixing S, Mn is preferably contained at 0.2% or more. Mn is an element that increases the strength of the steel sheet, and when relatively high strength is required, it is preferably contained at least 1.2%, more preferably at least 1.5%. Increasing the Mn content to this level reduces the variation in the mechanical properties and strain age hardening characteristics of the steel sheet due to changes in manufacturing conditions including hot rolling conditions, and is effective in stabilizing quality.
- Mn has a function of lowering the transformation point during hot rolling, and by containing it together with Si, the rise of the transformation point due to the inclusion of Si can be offset. Particularly for products with a small thickness, the quality and shape change sensitively due to the change of the transformation point, so it is important to strictly balance the Mn and Si contents. For these reasons, it is more preferable that Mn / Si be equal to or greater than 3,0. On the other hand, when Mn is contained in a large amount exceeding 2.0%, the hot deformation resistance of the copper plate tends to increase. In addition, the spot weldability and the formability of the weld tend to deteriorate. Furthermore, since the generation of ferrite is suppressed, the ductility tends to be significantly reduced. Therefore, Mn was limited to 2.0% or less. In applications where better corrosion resistance and formability are required, Mn is desirably 1.7% or less.
- P is a useful element as a solid solution strengthening element for steel.
- % Is preferably contained, and the content is appropriately adjusted according to the desired strength.
- the content In order to obtain a large increase in strength due to solid solution strengthening using P, it is desirable that the content be 0.015% or more.
- P when P is contained excessively, it makes the steel embrittled, and further reduces the stretch flangeability of the steel sheet.
- P has a strong tendency to segregate in steel, which results in embrittlement of the weld. Therefore, P was limited to 0.04% or less.
- the content is preferably set to 0.02% or less.
- S 0.02% or less
- S is an element that exists as an inclusion in the steel sheet and causes the deterioration of the ductility and the corrosion resistance of the steel sheet.
- S is limited to 0.02% or less.
- the content is preferably 0.015% or less.
- S is preferably set to 0.008% or less.
- the content of 0.001% or more is desirable.
- excessive A1 content deteriorates the steel sheet surface properties.
- the amount of N in the solid solution state which is an important component of the present invention, is reduced, and the amount of dissolved N that contributes to the strain aging hardening phenomenon becomes insufficient. Become.
- the A1 content is limited to as low as 0.02% or less. From the viewpoint of material stability, A1 is preferably set to 0.015% or less.
- N is an element that increases the strength of the steel sheet by solid solution strengthening and strain age hardening, and is the most important element in the present invention. N also has the function of lowering the transformation point of steel, and the inclusion of N is also useful for stabilizing the operation in situations where rolling, which is a thin material and greatly lowers the transformation point, is avoided. In the present invention, an appropriate amount of N is contained, and by controlling the production conditions, a necessary and sufficient amount of N in a solid solution state in a cold rolled product or a plated product is secured.
- the bake hardening amount (BH amount) is 80 MPa or more, and the increase in tensile strength before and after strain aging treatment ⁇ TS
- the mechanical property requirement of the steel sheet of the present invention of 40 MPa or more can be stably satisfied.
- N is set in the range of 0.0050-0.025%. From the viewpoints of material stability and yield in consideration of the entire manufacturing process, N is more preferably in the range of 0.0070% to 0.0020%. If the N content is within the range of the present invention, there is no adverse effect on weldability such as spot welding and arc welding.
- the amount of N in solid solution (also referred to as solid solution N) in steel is 0.0010% or more ( Concentration).
- the amount of solute N is determined by subtracting the amount of precipitated N from the total amount of N in the steel.
- the electrolytic extraction analysis method using the constant potential electrolysis method.
- the electrolysis method can stably dissolve only ground iron without decomposing extremely unstable fine precipitates such as carbides and nitrides.
- the result of measuring the amount of deposited N using the potentiostatic electrolysis method showed the best correspondence with the actual component strength.
- the residue extracted by the potentiostatic electrolysis is subjected to chemical analysis to determine the amount of N in the residue, and this is defined as the amount of precipitated N.
- the amount of solid solution N is preferably 0.0020% or more, and in order to obtain a higher value, it is preferably 0.0030% or more.
- N ZA1 (Ratio between N content and A1 content): 0.3 or more
- the solid solution N in the cold-rolled product and the plated product should be 0.0010% or more.
- Group a One or two or more of Cu, Ni, Cr, Mo are less than 1.0% in total
- Group b 0.1% or less in total of one or more of Nb, Ti, and V
- Group c Ca and REM 1 or 2 in total 0.0010 to 0.010%
- Group a elements Cu, Ni, Cr and Mo are all elements that contribute to an increase in strength without significantly reducing the ductility of the steel sheet.
- the total of the elements of group a be 1.0% or less.
- Group b elements Nb, Ti, and V are all elements that contribute to the refinement and uniformity of crystal grains. Nb: 0.002% or more, Ti: 0.002% or more, V: 0.002 %, The effect can be obtained, and it can be selected as necessary and contained alone or in combination. However, if the content is too large, the hot deformation resistance increases, and the chemical conversion property and the surface treatment properties in a broad sense deteriorate. For this reason, it is preferable that the total of the elements of group b be 0.1% or less.
- Group c elements Ca and REM are both elements that are useful for controlling the morphology of inclusions, and when stretch flangeability is required, it is preferable to include them alone or in combination. In this case, if the total of the elements in group c is less than 0.0010%, the effect of controlling the morphology of the inclusions is insufficient, and if it exceeds 0.010%, the occurrence of surface defects becomes conspicuous. For this reason, it is preferable to limit the total of the elements of group c to the range of 0.0010 to 0.010%.
- the cold-rolled steel sheet of the present invention is intended for use in automotive steel sheets and the like where high workability is required.
- the structure is to include a ferrite phase in an area ratio of 90% or more. If the area ratio of the ferrite phase is less than 90%, it is difficult to secure the ductility required for an automotive steel sheet that requires high workability. Although the detailed mechanism is unknown, it is difficult to stably achieve high strain age hardening when the area ratio of the ferrite layer is less than 90%.
- the phases other than the ferrite phase shall be the pearlite phase.
- Average grain size of ferrite phase 15 ⁇ m or less
- crystal grain size a value calculated by a quadrature method specified by ASTM from a cross-sectional structure photograph and a nominal particle size obtained by a cutting method specified by ASTM from a cross-sectional structure photograph (for example, Umemoto et al. 24 (1984), 33), whichever is larger.
- the cold-rolled steel sheet of the present invention secures a predetermined amount of solid solution N as a product.
- the amount of solid solution N is kept constant, ferrite + pearlite It was found that, when the average crystal grain size of the ferrite phase exceeded m, the strain aging hardening characteristics varied greatly. Also, the deterioration of mechanical properties when stored at room temperature becomes remarkable.
- the detailed mechanism is unknown at present, one of the causes of the variation in strain age hardening characteristics is the crystal grain size, and the bias and precipitation of alloying elements at the grain boundaries, and the processing that affects them. It is presumed to be related to the effect of heat treatment.
- the average crystal grain size of the ferrite phase is preferably 12 m or less.
- the cold-rolled steel sheet of the present invention having the above-described composition and structure is a cold-rolled steel sheet having a tensile strength T S of less than 440 MPa and excellent strain aging hardening characteristics.
- the amount of pre-strain is an important factor.
- the present inventors have investigated the effect of the amount of pre-strain on the strain age hardening characteristics, assuming the deformation mode applied to the steel sheet for automobiles. In an actual part, this one-axis equivalent strain exceeds 5%, and the component strength is 5% pre-strain. It was found that the strength was well matched to the strength obtained after the strain aging treatment. For this reason, in the present invention, the pre-strain of the strain aging treatment is set to a tensile strain of 5%.
- the conventional paint baking conditions are 170 ° C x 20 min as standard. If a strain of 5% or more is applied to the steel sheet of the present invention containing a large amount of solute N, hardening is achieved even with a milder (lower temperature) aging treatment, in other words, a wider aging condition is required. Is possible. In general, in order to increase the amount of hardening, it is advantageous to hold at a higher temperature and for a longer time as long as the material is not softened by excessive aging.
- the lower limit of the heating temperature at which hardening becomes significant after pre-deformation is approximately 100 ° C.
- the heating temperature exceeds 300, curing hardens, and when the heating temperature exceeds 400, it tends to soften slightly, and the occurrence of heat distortion and temper color becomes conspicuous.
- the holding time is about 30 s or more at a heating temperature of about 200 ° C., almost sufficient curing can be achieved.
- the holding time is preferably 60 s or more. However, holding for more than 20 min is not practical because further hardening cannot be expected and the production efficiency is significantly reduced.
- the aging treatment conditions were evaluated at a heating temperature of 170 ° C. and a holding time of 20 min under the conventional paint baking treatment conditions. Even under the aging condition of low-temperature heating and short-time holding, in which sufficient hardening is not achieved with the conventional paint-baked steel sheet, large hardening is stably achieved in the steel sheet of the present invention.
- the method of heating is not particularly limited. In addition to the atmosphere heating by a furnace used for normal paint baking, for example, induction heating, non-oxidizing flame, laser heating, plasma heating, and the like are preferable. Can be used.
- the strength of automotive components needs to be able to withstand complex external stress loads, so that not only the strength characteristics in a small strain range but also the strength characteristics in a large strain range are important for a material steel sheet.
- the present inventors set the BH amount of the steel sheet of the present invention, which is to be used as a material for automobile parts, at 80 MPa or more and the ATS amount at 40 MPa or more. Note that more More preferably, the BH amount should be lOOMPa or more, and ⁇ TS should be 50MPa or more.
- set the heating temperature during aging to a higher temperature and / or set the holding time to a longer time.
- the steel sheet of the present invention has an unprecedented advantage that the B # effective deterioration (phenomenon in which YS increases and E 1 (elongation) decreases) does not occur even if the steel sheet is left at room temperature for about one year without being formed. Is provided.
- the effect of the present invention can be exhibited even when the product sheet thickness is relatively thick, but when the product sheet thickness exceeds 3.2 mm, it is necessary to secure a necessary and sufficient cooling rate in the cold-rolled sheet annealing process.
- strain aging occurs during continuous annealing, making it difficult to obtain the desired strain aging hardening characteristics as a product. Therefore, the steel sheet of the present invention preferably has a thickness of 3.2 nun or less.
- the steel sheet of the present invention there is no problem even if the surface of the above-mentioned cold rolled steel sheet of the present invention is subjected to electric plating or melting plating. These plated steel sheets also show the same amount of T S, B H, and A T S as before plating.
- any of electroplating, hot-dip galvanized, alloyed hot-dip galvanized, hot-dip aluminized, electro-tin-plated, electro-chrome-plated, electro-nickel-plated, and the like can be preferably applied.
- the hot-rolled steel sheet is basically a hot rolling process in which a steel slab having a composition within the above-described range is heated and then roughly rolled to form a sheet par, and the sheet par is finish-rolled to form a rolled hot rolled sheet.
- the slab used in the production method of the present invention is desirably produced by a continuous production method in order to prevent macroscopic segregation of components, but may be produced by an ingot molding method or a thin slab continuous method.
- the slab is inserted directly into a heating furnace without cooling, or immediately after rolling after a slight heat retention. Energy saving processes such as running rolling can be applied without any problems.
- solid solution Direct rolling in which the precipitation of N is delayed, is one of the useful techniques to effectively secure the N in the state.
- the slab heating temperature should be 1000 ° C or higher in order to secure the necessary and sufficient amount of solid solution N in the initial state and to meet the target value of solid solution N in products (0.0010% or more). Is preferred.
- the slab heating temperature is preferably set to 1280 or lower from the viewpoint of avoiding an increase in loss due to an increase in oxidation weight.
- the slab heated under the conditions described above is converted into a sheet par by rough rolling.
- the conditions for the rough rolling need not be particularly specified, and may be generally known conditions. However, from the viewpoint of securing the amount of solute N, it is desirable to perform the treatment in as short a time as possible.
- the sheet par is finish-rolled into a hot-rolled sheet.
- the successive sheet pars are joined between the rough rolling and the finish rolling, and the finish rolling is performed continuously.
- the joining means it is preferable to use a pressure welding method, a laser welding method, an electron beam welding method, or the like.
- the proportion of irregular portions (the front and rear ends of the material to be treated) that are likely to be disturbed in finish rolling and subsequent cooling is reduced, and the stable pressure is extended (continuous rolling under the same conditions).
- Length and the stable cooling length (continuous length that allows cooling with tension applied) improve the product shape, dimensional accuracy, and yield.
- the conventional single-rolling for each sheet par has made it difficult to carry out lubrication rolling on thin materials and wide widths, which has been difficult due to problems such as penetration and penetration, and reduced rolling load and roll surface pressure. As a result, the life of the roll is extended.
- a sheet edge heater for heating the width end portion of the sheet par and a sheet per heater for heating the longitudinal end portion of the sheet bar are used between the rough rolling and the finish rolling. Then, it is preferable to uniform the temperature distribution in the width direction and the longitudinal direction of the sheet par. As a result, material variations within the steel sheet are further reduced. Can be done. It is preferable that the seat per edge heater and the seat per heater are of an induction heating type in terms of operational stability.
- the heating amount at this time depends on the steel composition and the like, but is preferably set so that the temperature distribution range in the width direction at the finish rolling exit side is generally 20 or less.
- the temperature difference in the longitudinal direction is compensated for by the sheet heater.
- the amount of heating at this time is preferably set such that the temperature at the end of the length is higher by 20 to 4 (TC than the temperature at the center).
- Finish rolling exit temperature 800 ⁇ or more
- the finish rolling exit temperature F D T shall be 800 or more in order to make the structure of the steel sheet uniform and fine. If the FDT is less than 800, the structure becomes uneven, such as the occurrence of pearlite bands, and the processed structure may remain partially. Such a residue of the processed structure can be avoided by setting the winding temperature to a high temperature. However, if the winding temperature is increased, the crystal grains become coarse, the amount of solute N decreases, or the in-plane anisotropy of mechanical properties increases, which is not preferable. In order to further improve the mechanical properties, it is desirable that FDT is 820 or more.
- Cooling after finish rolling After finishing rolling, quench at a cooling rate of 30 s or more Air cooling may be used after finish rolling, but quenching after finish rolling is desirable, and cooling at an average cooling rate of 30 ° CZ s or more desirable. By quenching under these conditions, the high temperature region where A1N precipitates can be quenched, and N in solid solution can be secured effectively.
- Winding temperature 650 ° C or less
- CT As the winding temperature CT decreases, the strength of the steel sheet increases, and solute N remains stable. In order to stably enhance the strain age hardening characteristics, it is preferable that CT is 650 or less. If the CT is less than 200, the shape of the steel sheet during winding is easily disturbed, and the uniformity of the material is deteriorated. For this reason, CT should be 200 or more. When more uniformity of the material is required, it is preferable that CT is 300 or more. The temperature is more preferably 400 ° C. or higher. Further, in the present invention, in finish rolling, lubricating rolling may be performed in order to reduce the hot rolling load, and finally to stabilize the strain hardening characteristics.
- the coefficient of friction during lubricating rolling is preferably in the range of 0.25 to 0.10.
- the combination of lubricating rolling and continuous rolling further stabilizes the operation of hot rolling.
- the hot-rolled sheet that has been subjected to the above-described hot rolling step is then subjected to pickling and cold rolling in a cold-rolling step to become a cold-rolled sheet.
- the conditions for pickling may be generally known conditions, and are not particularly limited. If the scale of the hot rolled sheet is extremely thin, cold rolling may be performed immediately without performing pickling.
- the cold rolling conditions may be generally known conditions, and are not particularly limited. It is preferable that the cold rolling reduction is 40% or more from the viewpoint of ensuring the uniformity of the tissue.
- the cold-rolled sheet is subjected to a cold-rolled sheet annealing step by continuous annealing, soaking and cooling, or further overaging.
- the annealing temperature of the continuous annealing was equal to or higher than the recrystallization temperature.
- the continuous annealing temperature is preferably set to 700 or more.
- the continuous annealing temperature exceeds 950 ° C, the shape of the steel sheet will be significantly disturbed. For this reason, it is preferable that the continuous annealing temperature be equal to or higher than the recrystallization temperature and equal to or lower than 950 eC . Holding time at continuous annealing temperature: 10-120 s
- the holding time at the continuous annealing temperature is preferably as short as possible from the viewpoint of refining the microstructure and securing the amount of solute N more than desired, but it should be at least 10 s from the viewpoint of operational stability. Is desirable. If the holding time exceeds 120 s, it will be difficult to refine the structure and secure the amount of dissolved N. Therefore, the holding time at the continuous annealing temperature is preferably in the range of 10 to 120 s. Cooling after soaking: Cooling rate to below 500 temperature range: 10 ⁇ 300 ° C / s
- Cooling after soaking in continuous annealing is important from the viewpoint of refining the microstructure and securing the amount of solute N.
- cooling after soaking is performed up to a temperature range of 500 or less.
- Continuous cooling at a cooling rate of 10-300 ° C / s. If the cooling rate is less than 10 ° C. Z s, it is difficult to secure a uniform and fine texture and a desired amount of solid solution N or more.
- the cooling rate exceeds 300 ° 0 / s, a large amount of solid solution C remains, the yield strength YS increases, the elongation E1 decreases remarkably, and the material in the width direction of the steel sheet decreases. Lack of uniformity. If the cooling stop temperature when cooling at a cooling rate of 10 to 300 ° C / s exceeds 500 ° C, microstructural refinement cannot be achieved.
- overaging is not always necessary, it is possible to adjust the amount of solid solution C and thereby adjust the related materials (YS, El). For this reason, an overaging treatment may be performed as necessary to stabilize the material.
- Overage treatment 20 s or more in the temperature range of 350 to 5003 ⁇ 4
- the amount of solute C can be reduced while maintaining the amount of solute N.
- either solid solution N or solid solution C is possible, but if a large amount of solid solution C is present, aging at room temperature becomes remarkable, and ductility, additivity, etc. The characteristic deterioration becomes remarkable.
- strain-age hardening characteristics are mainly improved by solid solution N, and excellent mechanical characteristics are exhibited.
- the overaging treatment temperature is lower than 350 ° C, the effect of reducing solid solution C is small.
- it exceeds 500 the microstructure cannot be refined. The effect is small when the overaging time is less than 20 s.
- the overaging treatment is preferably performed for 20 s or more in a temperature range of 350 to 500.
- the overaging time is preferably 600 s or less due to the line length of the continuous annealing equipment and other restrictions.
- temper rolling or leveling at an elongation of 1.5 to 15% may be further performed.
- new free dislocations can be introduced, and the BH and ATS amounts can be reduced.
- Such strain age hardening characteristics can be stably improved.
- the elongation percentage in the temper rolling or leveling process is 1.5% or more in total. If the elongation is less than 1.5%, the improvement in strain age hardening properties is small, while if the elongation exceeds 15%, the YS of the steel sheet increases and the ductility decreases.
- the working modes are different between the temper rolling and the leveler working, the present inventors have confirmed that there is no significant difference in the effect on the strain age hardening characteristics of the steel sheet.
- the cold-rolled steel sheet of the present invention may be further subjected to a plating treatment or an alloying treatment and applied as a plated steel sheet.
- the heat cycle of the alloying treatment corresponds to the above-mentioned overaging treatment, and there is no deterioration due to aging at room temperature, and the strain aging hardening characteristics can be remarkably improved.
- Molten steel having the composition shown in Table 1 was smelted in a converter and made into a slab by a continuous casting method. These slabs were heated under the conditions shown in Table 2, rough-rolled to form sheet pars having the thickness shown in Table 2, and then hot-rolled by a hot rolling step of finish rolling under the conditions shown in Table 2. For some, lubrication rolling was performed by finish rolling. In addition, for a part, the sheet pars that were adjacent to each other on the entry side of the finish rolling after the rough rolling were joined by a melt pressure welding method and continuously rolled. For some parts, the sheet par temperature was adjusted using induction heating sheet par edge heaters and sheet par heaters at the width and length ends of the sheet par.
- These hot rolled sheets were pickled by a cold rolling process comprising cold rolling under the conditions shown in Table 2.
- the cold rolled sheets were subjected to continuous annealing in a continuous annealing furnace under the conditions shown in Table 2.
- temper rolling was performed.
- the annealing temperatures of the continuous annealing were all higher than the recrystallization temperature.
- the amount of solute N was determined by subtracting the amount of precipitated N from the total amount of N in the steel determined by chemical analysis.
- the amount of precipitated N was determined by an analytical method using the above-described potentiostatic electrolysis method.
- a specimen is taken from each cold-rolled annealed plate, and the microstructure of the cross section (C cross section) orthogonal to the rolling direction is imaged using an optical microscope or a scanning electron microscope, and the tissue fraction is obtained using an image analyzer. And asked for the type.
- the grain size of ferrite is the value calculated from the micrograph of the cross section (C cross section) perpendicular to the rolling direction by the quadrature method specified in ASTM or the nominal particle size determined by the cutting method specified in ASTM. The larger of the diameters was used.
- a JIS No. 5 test piece was sampled from each cold-rolled annealed sheet in the rolling direction, a 5% tensile pre-strain was applied here as a pre-deformation, and a heat treatment equivalent to paint baking at 170 X 20 min was applied.
- YS 5 % is the deformation stress when the product plate is pre-deformed by 5%
- YS BH and TSBH are the pre-deformation-yield stress and tensile strength after paint baking treatment
- TS is the tensile strength of the product plate. Strength.
- All of the examples of the present invention have excellent ductility and excellent strain aging hardening characteristics, and exhibit a remarkably high BH content and ATS.
- the pre-deformation-paint baking treatment has a yield stress of 80 MPa or more and a tensile strength of 40 MPa or more, and has high strain age hardening characteristics and high formability, both of which increase.
- a highly versatile cold-rolled steel sheet can be manufactured at low cost and without disturbing the shape, which is extremely effective in industry.
- the paint baking treatment increases the yield strength as well as the tensile strength, so that stable and high parts properties can be obtained.
- the thickness of the steel plate used can be reduced, for example, from 2.0 band thickness to 1.6 ram thickness, which also has the effect of reducing the weight of the car body.
- the present invention improves the strain age hardening characteristics by adding N, which has a small increase in hot deformation resistance, so that hot rolling of thin materials can be easily performed without increasing deformation resistance. This has an industrially remarkable effect.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2380377 CA2380377C (en) | 2000-05-31 | 2001-02-14 | Cold-rolled steel sheets with superior strain-aging hardenability |
EP20010906127 EP1291447B1 (en) | 2000-05-31 | 2001-02-14 | Cold-rolled steel sheet having excellent strain aging hardening properties and method for producing the same |
US10/031,742 US6695932B2 (en) | 2000-05-31 | 2001-02-14 | Cold-rolled steel sheet having excellent strain aging hardening properties and method for producing the same |
DE2001610586 DE60110586T2 (de) | 2000-05-31 | 2001-02-14 | Kaltgewalztes stahlblech mit ausgezeichneten reckalterungseigenschaftenund herstellungsverfahren für ein solches stahlblech |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000162498 | 2000-05-31 | ||
JP2000-162498 | 2000-05-31 |
Publications (1)
Publication Number | Publication Date |
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WO2001092593A1 true WO2001092593A1 (fr) | 2001-12-06 |
Family
ID=18666389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/001002 WO2001092593A1 (fr) | 2000-05-31 | 2001-02-14 | Tole d'acier laminee a froid presentant d'excellentes proprietes de rheodurcissement par vieillissement, et procede de production |
Country Status (8)
Country | Link |
---|---|
US (1) | US6695932B2 (ja) |
EP (1) | EP1291447B1 (ja) |
KR (1) | KR100611541B1 (ja) |
CN (1) | CN1152970C (ja) |
CA (1) | CA2380377C (ja) |
DE (1) | DE60110586T2 (ja) |
TW (1) | TW500809B (ja) |
WO (1) | WO2001092593A1 (ja) |
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Title |
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Also Published As
Publication number | Publication date |
---|---|
TW500809B (en) | 2002-09-01 |
EP1291447B1 (en) | 2005-05-04 |
KR100611541B1 (ko) | 2006-08-10 |
KR20020036838A (ko) | 2002-05-16 |
DE60110586T2 (de) | 2005-12-01 |
CA2380377A1 (en) | 2001-12-06 |
EP1291447A4 (en) | 2004-05-19 |
DE60110586D1 (de) | 2005-06-09 |
CN1152970C (zh) | 2004-06-09 |
US20030047257A1 (en) | 2003-03-13 |
CA2380377C (en) | 2007-01-09 |
EP1291447A1 (en) | 2003-03-12 |
US6695932B2 (en) | 2004-02-24 |
CN1386141A (zh) | 2002-12-18 |
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