EP1627092A1 - Kaltgewalztes, aluminiertes blech aus stahl mit dualphasen-gefüge und sehr hoher festigkeit für explosionssichere gurt vom fernseher, und dessen verfahren zur herstellung - Google Patents
Kaltgewalztes, aluminiertes blech aus stahl mit dualphasen-gefüge und sehr hoher festigkeit für explosionssichere gurt vom fernseher, und dessen verfahren zur herstellungInfo
- Publication number
- EP1627092A1 EP1627092A1 EP04742705A EP04742705A EP1627092A1 EP 1627092 A1 EP1627092 A1 EP 1627092A1 EP 04742705 A EP04742705 A EP 04742705A EP 04742705 A EP04742705 A EP 04742705A EP 1627092 A1 EP1627092 A1 EP 1627092A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- steel
- sheet
- cooled
- aluminized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 5
- 229910000885 Dual-phase steel Inorganic materials 0.000 title claims description 4
- 229910052751 metal Inorganic materials 0.000 title abstract 3
- 239000002184 metal Substances 0.000 title abstract 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 11
- 150000001247 metal acetylides Chemical class 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 238000005269 aluminizing Methods 0.000 claims description 19
- 238000000137 annealing Methods 0.000 claims description 18
- 238000005098 hot rolling Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 4
- 239000010936 titanium Substances 0.000 abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 238000005097 cold rolling Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 11
- 238000005246 galvanizing Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000926 A-3 tool steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
- H01J5/03—Arrangements for preventing or mitigating effects of implosion of vessels or containers
-
- 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
-
- 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
- C21D2211/008—Martensite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- 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
Definitions
- the present invention relates to the field of anti-implosion belts for cathode ray screens.
- These elements play an essential role in televisions, because they prevent deformation of the front surface of the tube under the effect of the pressure difference between the inside of the tube (10 "7 torr) and atmospheric pressure.
- the tensioning by hooping of the belt counterbalances the effect of the atmospheric pressure.In the absence of this correction, the colors on the screen are disturbed due to the modification of the distance grid-phosphorescent panel.
- Anti-implosion belts are usually made from calm aluminum steels or non-interstitial aluminized steels, this coating providing protection against corrosion. These traditional solutions do not however allow very high levels to be reached, since the elastic limit Rp0,2 is close to 400 MPa after final positioning of the belt on the tube under these conditions. However, the current trend towards large screens or flat screens leads to particularly high service efforts. We can then increase the section of the anti-implosion belts, but this runs up against the concern of reducing the weight of the televisions. The use of materials with higher mechanical characteristics (an important parameter being the elastic limit after fitting the belt on the tube) is in turn limited by the fact that the elongation of these materials is generally reduced , which leads to formatting problems (cracks) in the folding areas. It should therefore be noted that there has so far been no anti-implosion belt with high mechanical characteristics (elastic limit after fitting greater than 500 MPa, good resistance-ductility compromise)
- the object of the present invention is to provide an anti-implosion belt with high mechanical characteristics, in particular with an elastic limit greater than 500 MPa after the band has been placed on the tube, a process and a sheet of steel for making this belt economically.
- the invention relates to a process for manufacturing a steel sheet Dual Phase (that is to say steel whose structure consists of a hard phase, essentially martensitic, dispersed within a more deformable ferritic matrix) capable of being used for the manufacture of a television anti-implosion belt, characterized in that a steel is produced, the chemical composition of which comprises, the contents being expressed in weight: 0.03% ⁇ C ⁇ 0.3%, 1% ⁇ Mn ⁇ 3%, 0.05% ⁇ If ⁇ 2%, 0.02% ⁇ Al ⁇ 2%, 0.02% ⁇ Cr ⁇ 1 %, Mo ⁇ 1%, S ⁇ 0.02%, P ⁇ 0.2%, N ⁇ 0.01% and, optionally, one or more elements chosen from Ti, V, Zr
- a steel slab or ingot of said composition is brought to a temperature between 1100 and 1300 ° C., the slab or the ingot is hot rolled, the temperature at the end of hot rolling being higher than the temperature Ar3 of l steel, the sheet thus obtained is cooled at a speed V R of between 1 and 500 ° C / s, the sheet is wound at a temperature T bob such that 300 ⁇ T b0b ⁇ 720 ° C, the sheet is cold rolled , the cold-rolled sheet is subjected to continuous annealing at a temperature T m such that T m > Ad, the sheet is cooled at a speed greater than 2 ° C / s to the aluminizing temperature, said aluminized sheet by soaking in an aluminum-based bath at a temperature between 650 and 720 ° C, and said sheet is cooled to room temperature at a speed greater than 2 ° C / s.
- a skin-pass treatment is applied to said aluminized sheet with a reduction rate of less than 5%.
- the subject of the invention is also a steel sheet manufactured according to the process described above, characterized in that the structure of the steel consists of a ferritic matrix containing a proportion of martensite of between 5 and 30%, and less than 2% of phases with carbides.
- the invention also relates to an anti-implosion television belt, characterized in that it is produced from a strip of said sheet steel.
- FIG. 2 shows, in the form of a continuous cooling transformation diagram, the metallurgical structures formed under annealing conditions with continuous aluminizing or galvanizing cycles.
- FIG. 3 and 4 illustrate the microstructures corresponding respectively to the thermal galvanizing and aluminizing cycles.
- manganese is an element which stabilizes the austenite and provides satisfactory hardenability. A minimum content of 1% is necessary to obtain the desired mechanical properties. However, beyond 3%, its gammagenic nature leads to the formation of an overly marked band structure and also degrades the weldability.
- Silicon is an element participating in the deoxidation of liquid steel and hardening in solid solution. In addition, it prevents the precipitation of carbides by promoting the formation of martensitic phase. It plays an effective role from 0.05%. However, beyond an Si content of
- Chromium acts on hardening in solid solution and on hardenability. In this latter respect, it therefore makes it possible to obtain a dual-phase structure with lower cooling rates than for compositions containing no chromium. It is effective from a content of 0.02%. Above 1%, there is an increase in the risk of dusting during stamping, as well as a deterioration in the compromise between strength and ductility.
- Molybdenum acts on hardening in solid solution and on hardenability. In this latter respect, it therefore makes it possible to obtain a dual-phase structure with lower cooling rates than for compositions not containing molybdenum. Above 1%, it significantly degrades the weldability of the steel.
- - Phosphorus is an element that reduces the ability to spot weld and hot ductility, particularly because of its tendency to segregate or co-segregate with manganese. For these reasons, its content must be limited to 0.2%.
- microalloy elements Ti, Nb, V, Zr
- the implementation of the manufacturing process according to the invention is as follows: - Slabs or steel ingots of the above composition are first brought to a temperature between 1100 and 1300 ° C.
- the initial temperature should therefore be limited to 1300 ° C in order to maintain a fine austenitic grain at this stage.
- the rolling is carried out in the austenitic domain and must be finished at a temperature higher than Ar3, depending on the composition of the steel.
- the cooling rate after maintenance must be greater than 2 ° C / s.
- FIG. 1 presents an example (1 1) of associated annealing to an aluminizing cycle.
- a proportion of martensite greater than 5% guarantees a minimum resistance of 450 MPa after 2% of cold deformation. Through against the ductility properties are lowered when the proportion of martensite is greater than 30% and when the proportion of phases containing carbides is more than 2%.
- the example is based on steel sheets whose composition is shown in Table 1 (analyzes in% by weight)
- Steels A1 to A3 were heated to a temperature of 1250 ° C, then subjected to hot rolling with an end of rolling temperature of 900 ° C followed by cooling at a speed v R of 25 ° C / s and a winding at 570 ° C.
- the cold-rolled sheets to a thickness of 1 mm were then subjected to continuous annealing at a temperature of 800 ° C for 60 s, to an aluminizing cycle (reference “I” in Table 2, corresponding conditions to the invention) at 680 ° C, then cooled to 20 ° C / s to ambient.
- the properties were also indicated after annealing and then galvanizing cycle at 450 ° C. (reference “R” in table 2)
- the mechanical properties measured on 12.5 ⁇ 50 mm 2 test pieces and the microstructures were reported in the table 2, with:
- a manufacturing process according to the invention leads to structures composed almost entirely of ferrite and martensite, practically without phases containing carbides. This point is illustrated in Figures 3 and 4 where we can compare the structures of A3 steel in the case of a cycle galvanizing and aluminizing respectively.
- These microstructures obtained after the aluminizing cycle are associated with mechanical characteristics superior to those resulting from a reference treatment: low Re / Rm ratio, absence of plateau, high values of the parameter associating resistance and elongation.
- the application of the invention makes it possible to increase the resistance from 40 to 80 MPa compared to a treatment with annealing with galvanization.
- the steels make it possible to obtain a guaranteed minimum resistance of 450, 500 and 600 MPa respectively.
- Example 2 Example 2:
- Table 3 presents the composition (analysis in% by weight) of a steel making it possible to obtain a resistance of 750 MPa when the latter is subjected to a galvanizing cycle (cf. conditions of the "R" cycle above)
- a galvanizing cycle cf. conditions of the "R" cycle above
- These conditions, respectively designated by 11 and 12 therefore correspond to those of the invention.
- microstructure is practically free of phases containing carbides
- the resistance obtained under the conditions of the invention is much higher than that of the reference treatment, since the latter goes from 750 MPa to more than 850 MPa.
- the implementation of the invention makes it possible to lower the content of alloying elements necessary to obtain these properties, which is advantageous in terms of costs and subsequent ease of implementation. of the product (welding, shaping)
- Table 5 presents two examples of compositions (analyzes in% by weight) of reference steels: These reference steels R1 (calmed aluminum) or without interstitials (reference R2) are usually used for the manufacture of television belts.
- the table also presents two compositions of dual phase steels corresponding to the invention (references 13 and 14) Steel sheets of approximately 1 mm thick were produced on the bases indicated in Example 1. These sheets were then continuously annealed in a range between 780 and 820 ° C, subjected to an aluminizing treatment at 680 ° C, then to a skin-pass treatment with a deformation of between 1 to 3%.
- the microstructure of the reference steel R1 consists of ferrite and precipitates of titanium carbonitrides, that of the steel R2 of ferrite and cementite.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0306004A FR2855184B1 (fr) | 2003-05-19 | 2003-05-19 | Tole laminee a froid et aluminiee en acier dual phase a tres haute resistance pour ceinture anti-implosion de televiseur, et procede de fabrication de cette tole |
| PCT/FR2004/001149 WO2004104254A1 (fr) | 2003-05-19 | 2004-05-12 | Tole laminee a froid et aluminiee en acier dual phase a tres haute resistance pour ceinture anti-implosion de televiseur, et procede de fabrication de cette tole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1627092A1 true EP1627092A1 (de) | 2006-02-22 |
Family
ID=33396576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04742705A Withdrawn EP1627092A1 (de) | 2003-05-19 | 2004-05-12 | Kaltgewalztes, aluminiertes blech aus stahl mit dualphasen-gefüge und sehr hoher festigkeit für explosionssichere gurt vom fernseher, und dessen verfahren zur herstellung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1627092A1 (de) |
| CN (1) | CN1791695A (de) |
| FR (1) | FR2855184B1 (de) |
| WO (1) | WO2004104254A1 (de) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2007009551A (es) | 2005-02-10 | 2007-09-21 | Nippon Steel Corp | Lamina de acero que tiene un recubrimiento basado en aluminio formado ahi y una banda de prevencion de explosion que la utiliza. |
| PL1918405T3 (pl) * | 2006-10-30 | 2009-10-30 | Thyssenkrupp Steel Ag | Sposób wytwarzania płaskich produktów stalowych z wielofazowej stali stopowej z krzemem |
| EP2028282B1 (de) * | 2007-08-15 | 2012-06-13 | ThyssenKrupp Steel Europe AG | Dualphasenstahl, Flachprodukt aus einem solchen Dualphasenstahl und Verfahren zur Herstellung eines Flachprodukts |
| ES2367713T3 (es) * | 2007-08-15 | 2011-11-07 | Thyssenkrupp Steel Europe Ag | Acero de fase dual, producto plano de un acero de fase dual tal y procedimiento para la fabricación de un producto plano. |
| KR101008042B1 (ko) * | 2009-01-09 | 2011-01-13 | 주식회사 포스코 | 내식성이 우수한 알루미늄 도금강판, 이를 이용한 열간 프레스 성형 제품 및 그 제조방법 |
| CN101880823A (zh) * | 2010-07-05 | 2010-11-10 | 北京科技大学 | 一种热轧铌微合金化多相钢及其制备方法 |
| CN103060703B (zh) * | 2013-01-22 | 2015-09-23 | 宝山钢铁股份有限公司 | 一种780MPa级冷轧双相带钢及其制造方法 |
| CN104046892A (zh) * | 2013-03-15 | 2014-09-17 | 上海梅山钢铁股份有限公司 | 一种用于显像管防爆带的冷轧热镀铝锌钢板及其生产方法 |
| EP2980227A4 (de) * | 2013-03-28 | 2016-12-21 | Hyundai Steel Co | Stahlblech und verfahren zur herstellung davon |
| DE102014108335B3 (de) * | 2014-06-13 | 2015-10-01 | Thyssenkrupp Ag | Verfahren zur Herstellung eines aluminierten Verpackungsstahls und Verwendung eines aluminierten Stahlblechs als Verpackungsstahl |
| JP6394812B2 (ja) * | 2016-03-31 | 2018-09-26 | Ｊｆｅスチール株式会社 | 薄鋼板およびめっき鋼板、並びに、熱延鋼板の製造方法、冷延フルハード鋼板の製造方法、熱処理板の製造方法、薄鋼板の製造方法およびめっき鋼板の製造方法 |
| MX2018011687A (es) | 2016-03-31 | 2019-02-18 | Jfe Steel Corp | Lamina de acero y lamina de acero chapeada, metodo para la produccion de lamina de acero laminada en caliente, metodo para la produccion de lamina de acero extra-dura laminada en frio, metodo para la produccion de lamina tratada termicamente, metodo para la produccion de lamina de acero, y metodo para la produccion de lamina de acero chapeada. |
| CN105908090B (zh) * | 2016-04-20 | 2018-02-13 | 本钢板材股份有限公司 | 一种热轧双相钢及预防该热轧双相钢扁卷的制造方法 |
| CN106011631B (zh) * | 2016-07-11 | 2018-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种800MPa级低碳热镀锌双相钢及其制备方法 |
| CN109280861A (zh) | 2017-07-21 | 2019-01-29 | 蒂森克虏伯钢铁欧洲股份公司 | 具有良好耐老化性的扁钢产品及其生产方法 |
| CN112030064A (zh) * | 2020-08-24 | 2020-12-04 | 宜兴市鑫源辊业有限公司 | 高耐磨十八辊轧机工作辊 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE430902B (sv) * | 1979-05-09 | 1983-12-19 | Svenskt Stal Ab | Sett att vermebehandla ett stalband med 0,05 - 0,20% kolhalt och laga halter legeringsemnen |
| GB2071144B (en) * | 1980-01-18 | 1983-07-27 | British Steel Corp | Dual-phase steel |
| TW426742B (en) * | 1997-03-17 | 2001-03-21 | Nippon Steel Corp | Dual-phase type high strength steel sheets having high impact energy absorption properties and a method of producing the same |
| CN1117884C (zh) * | 1998-09-29 | 2003-08-13 | 川崎制铁株式会社 | 高强度薄钢板、高强度合金化热镀锌钢板及它们的制造方法 |
| FR2790009B1 (fr) * | 1999-02-22 | 2001-04-20 | Lorraine Laminage | Acier dual-phase a haute limite d'elasticite |
| JP2001011574A (ja) * | 1999-06-23 | 2001-01-16 | Nippon Steel Corp | Ｔｖブラウン管フレーム用熱延鋼板およびその製造方法 |
| DE10130774C1 (de) * | 2001-06-26 | 2002-12-12 | Thyssenkrupp Stahl Ag | Verfahren zum Herstellen von hochfesten, aus einem Warmband kaltverformten Stahlprodukten mit guter Dehnbarkeit |
| FR2833617B1 (fr) * | 2001-12-14 | 2004-08-20 | Usinor | Procede de fabrication de toles laminees a froid a tres haute resistance d'aciers dual phase micro-allies |
-
2003
- 2003-05-19 FR FR0306004A patent/FR2855184B1/fr not_active Expired - Fee Related
-
2004
- 2004-05-12 WO PCT/FR2004/001149 patent/WO2004104254A1/fr not_active Application Discontinuation
- 2004-05-12 EP EP04742705A patent/EP1627092A1/de not_active Withdrawn
- 2004-05-12 CN CN200480013608.2A patent/CN1791695A/zh active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004104254A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2855184A1 (fr) | 2004-11-26 |
| CN1791695A (zh) | 2006-06-21 |
| FR2855184B1 (fr) | 2006-05-19 |
| WO2004104254A1 (fr) | 2004-12-02 |
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