EP3204530A1 - Kaltgewalztes und rekristallisierend geglühtes stahlflachprodukt und verfahren zu seiner herstellung - Google Patents
Kaltgewalztes und rekristallisierend geglühtes stahlflachprodukt und verfahren zu seiner herstellungInfo
- Publication number
- EP3204530A1 EP3204530A1 EP15762569.0A EP15762569A EP3204530A1 EP 3204530 A1 EP3204530 A1 EP 3204530A1 EP 15762569 A EP15762569 A EP 15762569A EP 3204530 A1 EP3204530 A1 EP 3204530A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flat steel
- steel product
- flat
- product
- steel
- 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.)
- Granted
Links
Classifications
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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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
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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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0442—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
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0473—Final recrystallisation annealing
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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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
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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
- C21D2211/005—Ferrite
Definitions
- the invention relates to a cold-rolled and
- the invention relates to a method for producing a flat steel product of the type in question.
- Steel flat products intended for bodywork or similar applications are typically provided with a surface texture characterized by a defined roughness and an equally defined surface roughness Peak distribution is characterized in order to meet the requirements regarding the formability and surface appearance (paintability and gloss) existing customer requirements.
- a typical example of corresponding specifications from the automotive industry is an arithmetic center roughness (hereinafter referred to as "roughness") Ra of 1.1-1.6 ⁇ m at a peak number RPc of at least 60 1 / cm.
- the roughness Ra and the peak number RPc are determined in accordance with the steel iron test sheet SEP 1940 using a stylus cutter according to ISO 3274.
- Wsa waviness characteristic Wsa (1-5)
- Wsa steel Iron Test Sheet SEP 1941: 2012-05 after 5% plastic strain in the Marciniak creep test.
- Typical requirements are Wsa values of 0.35 ym to 0.40 ym.
- Particularly good gloss is obtained at Wsa values of ⁇ 0.35 ⁇ m, in particular ⁇ 0.30 ⁇ m.
- peak numbers RPc of at least 75 l / cm and roughnesses Ra of 0.9-1.4 ⁇ m are required.
- Position sensors are provided in front of and behind the
- Rolling mill determines in which the flat steel product
- Tips reduced. To make matters worse, the fact that already in the dry-passing during the transfer of existing on the roll surface tips on each rolled flat steel product
- the Degree of D can also with regard to
- Energy beam is generated a regular pattern of wells.
- the flat steel product to be processed is tempered by means of two work rolls, of which at least one is machined in the manner indicated above.
- Neck reduction should not be less than 0.3% to the pattern of the work roll on the
- trapezoidal land portions having a flat upper surface, groove-like recessed portions formed to form a land portion
- Elevation areas outside of the recessed areas are formed so that they are higher than the bottom of the
- the steel sheet consists of a steel in wt .-%, 0,10% or less C, 0.05% or less Si, 0.1 - 1.0% Mn, 0.05% or less P, 0, 02% or less S, 0.02-0.10% Al, less than 0.005% N and balance of Fe and unavoidable impurities.
- the steel sheet thus obtained becomes an annealing treatment
- Annealed annealing temperature of 730 - 850 ° C and then cooled to a maximum of 600 ° C temperature with a cooling rate of at least 5 ° C / s is cooled.
- the cold rolled annealed flat steel product obtained thereafter has a mainly ferrite structure having an average crystal grain diameter of 5 to 30 ⁇ m.
- the flat steel product is rollformed using a roll whose
- the object of the invention was to provide a flat steel product which has an optimized
- the invention has achieved this object by providing such a flat steel product according to claim 1.
- the steel additionally optional
- Alloy elements may contain:
- a flat steel product according to the invention thus consists of a soft steel which has a yield strength Rp0.2 of up to 180 MPa, in particular of less than 150 MPa
- Elongation at break A80 of at least 40% has a high elongation and a high n-value of at least 0.23. With this property combination he is for a forming,
- a flat steel product according to the invention has a by an arithmetic center roughness Ra of
- An inventive flat steel product has its
- Coating can be applied. By applying known electrolytic processes, it is ensured that the surface structure of the present invention is dressed
- passive layer eg. B. as
- Surface texture is characterized by a stochastic distribution of the pits and peaks which determine the roughness value Ra according to the invention and the tip number RPc according to the invention.
- Stochastic surface textures are irregular
- deterministic surface textures are regular surface textures characterized by a regular distribution of similar design features.
- the invention seeks to optimize the friction behavior between steel surface and tool during forming processes in the oiled or greased state.
- a tool-based forming process especially during deep ⁇ or stretch, stands out a stochastic
- Coatings which, if necessary, can additionally be applied to the flat steel product according to the invention.
- the roughness value Ra should in the inventive
- Surface of a flat steel product according to the invention should not be less than 0.8 ym, otherwise the surface is too smooth.
- the roughness value Ra should, however, also be no greater than 1.6 .mu.m, because the surface is then too rough to achieve optimized forming properties.
- roughness values Ra of 0.9-1.4 ⁇ m can be provided.
- the peak number RPc should not be less than 75 per cm, because this would have a negative effect on the Wsa value.
- provided flat steel product surface is set to at least 80 per cm.
- Wsa values of less than 0.30 ⁇ m can be guaranteed by the fact that for the peak number RPc a minimum value of 90 per cm
- An inventive flat steel product contains as
- the C content of the flat steel product according to the invention is 0.0001 - 0.003 wt .-%.
- C is inevitably contained in the molten steel, so that C contents of at least 0.0001 wt .-% are always detectable in a steel according to the invention.
- a C content above 0.003% by weight deteriorates the intended reformability due to an excessive solidification contribution of the carbon. This can surely be prevented by lowering the C content to 0.002 wt% or less.
- Si is present in a flat steel product of the invention at levels of 0.001-0.025 wt%. Also Si is inevitably contained in the molten steel. However, an Si content above the limit of 0.025% by weight according to the invention deteriorates the formability due to an excessive solidification contribution. In order to avoid negative influences of the presence of Si, the Si content of a flat steel product according to the invention may be limited to at most 0.015% by weight.
- Mn is present in a steel flat product according to the invention in amounts of 0.05-0.20% by weight. Mn contents which are in this range contribute optimally to the formability of a flat steel product according to the invention. If the Mn contents are outside the range prescribed according to the invention, too little or too much will result due to solid solution hardening. An optimal influence of the presence of Mn in the invention
- the P content can be limited to at most 0.012 wt .-%.
- AI is in a steel flat product according to the invention in Levels of 0.02-0.055 wt% present. Al is used in steel production to calm the molten steel and must therefore within the limits of the invention
- the positive influence of Al in the alloy of a flat steel product according to the invention can be optimally utilized by limiting the Al content to at most 0.03% by weight.
- Ti is present in a flat steel product of the invention at levels of 0.01-0.1 wt%. Ti serves to bond interstitial alloying elements and thus contributes to precipitation hardening. At a Ti content of less than 0.01 wt .-% are interstitial
- Alloy elements continue to be dissolved in the crystal lattice before, which has a negative effect on the desired forming capacity
- Cr can be present in amounts of 0.001-0.05% by weight "6". steel flat product according to the invention are added, so that the presence of Cr at such low
- V can optionally be molten steel
- V can be present in the flat steel product according to the invention in contents of up to 0.005% by weight.
- Mo may optionally be present at levels of up to 0.015% by weight in the flat steel product of the present invention to serve for solid solution strengthening.
- a Mo content above the limit of the invention deteriorates the intended formability.
- N can additionally be formed by TiN formation
- the optional N content is optimally limited to at most 0.003 wt% in order to achieve the desired forming properties to back up .
- Steel flat product according to the invention may be present. These include B, Cu, Nb, Ni, Sb, Sn and S, the total amount of which should be at most 0.2% by weight, in the case of
- Nb, B or Sb for these impurities following special conditions apply: Sb content at most 0.001 wt .-%, Nb content at most 0.002 wt .-% and B content at most 0.0005 wt .-%.
- Steel flat products produced according to the invention can be reliably produced, for example, by the method of production according to the invention.
- the process according to the invention for producing a flat steel product according to the invention comprises for this purpose
- Alloy elements may contain:
- N 0.001-0.004%; heat-treating the flat steel product in a continuous flow through an annealing furnace under an annealing atmosphere consisting of 1 to 7% by volume of H2 at a dew point of -10 ° C to -60 ° C and the balance of N2 and unavoidable impurities;
- Aging end temperature T3 is cooled from 250 to 350 ° C, and - wherein the flat steel product after cooling to the final aging temperature T3 with a
- Cooling rate CR3 of 1.5 - 5.0 ° C / s is cooled to room temperature; c) temper rolling of the recrystallizing annealed
- Flat-rolled steel product with a degree of dressing D of 0.4-0.7% using a skin pass mill its peripheral surface coming into contact with the flat steel product has an arithmetic mean roughness Ra of 1.0-2.5 ym and a peak RPc of at least 100 l / cm, wherein the center roughness Ra and the peak number RPc conditional in the surface of the
- Dressing work roll molded depressions and tips are stochastically distributed.
- step b) of the method according to the invention the respective partial steps provided for the heat treatment of the flat steel product are completed in a continuous furnace.
- the heat treatment process is carried out as in continuous flow annealing, because in this way the individual steps of the
- continuous furnace can individual
- Sections in a manner known per se for example in the manner of a DFF (Direct Fired Furnace), a DFI (Direct Flame Impingement) or a NOF (Non Oxidizing Furnace) Furnace directly or, for example, in the manner of a RTF (Radiant Tube Furnace) oven indirectly heated.
- DFF Direct Fired Furnace
- DFI Direct Flame Impingement
- NOF Non Oxidizing Furnace
- Cooling measures can be carried out.
- a holding temperature Tl is provided which lies in the temperature range of 750-860 ° C. At below 750 ° C annealing temperatures, the complete recrystallization of the structure of the flat steel product can not be achieved safely. At temperatures of more than 860 ° C, however, there is the
- recrystallizing annealing is kept at the holding temperature Tl, is 30 - 90 seconds to optimal
- the overaging start temperature T2 is at least 400 ° C, because at lower temperatures, the cooling power required for cooling to the overaging start temperature T2 high, but the material properties would not be further positively influenced. On the other hand, if the overaging start temperature T2 were above 600 ° C., the recrystallization would not be terminated in a sustainable manner and the danger of
- Coarse grain formation exist. With a 400 - 600 ° C,
- Overaging start temperature T2 can be optimized forming properties.
- the steel flat product is subjected to an overaging treatment for a duration t2 of 30-400 seconds, at which it is cooled to a cooling rate CR2 of 0.5-12 ° C / s Overheating end temperature T3 is cooled. If the time t2 were less than 30 seconds, the time would be too short for the interstitial alloy atoms to be diffused in the recrystallized structure of the
- a cooling rate CR2 of at least 0.5 ° C / sec is set to complete the overaging treatment within a practical time.
- Cooling rate CR2 is set, the duration t2 of the overaging treatment would be too short. There would then be too little time for the diffusion of the interstitial
- the final temperature T3 of the overaging treatment according to the invention is 250-350 ° C. That would be
- step b) The partial operations of step b) are carried out under an inert gas annealing atmosphere which has a hydrogen content of 1-7 vol .-% and otherwise of nitrogen and technically unavoidable Impurities.
- an H2 content of less than 1.0% by volume there would be a risk of oxide formation on the surface of the flat steel product, which would impair its surface quality and thus its painting properties.
- an H2 content of the annealing atmosphere above 7.0% by volume would not bring any additional positive effect and would also be problematic from the point of view of operational safety.
- the dew point of the annealing atmosphere is according to the invention at -10 ° C to -60 ° C. If the dew point of the annealing atmosphere were above -10 ° C., there would also be a risk of undesirable oxide formation on the surface of the flat steel product with regard to the desired surfaces. A dew point below -60 ° C would only be possible with great effort on a large-scale and would also have no additional positive effect. optimal
- Cooling rate CR3 of 1.5 - 5.0 ° C / s provided.
- Cooling Rate CR3 is chosen to economically avoid deterioration of the surface condition due to oxide formation, which could occur if the cooling is too slow.
- the step c) of the method according to the invention is essential for the particularly good suitability of flat steel products according to the invention for a coating with optimized Lacquer finish.
- This particular suitability results from a Wsa value of at most 0.40 ym, typically at most 0.35 ym, in particular less than 0.30 ym, which stands for a minimized waviness of the flat steel product surface.
- the degree of dressing D defined above according to the invention after the heat treatment (steps b)) provided temper rolling (step c)) is 0.4 to 0.7%.
- a D grade of less than 0.4% a deformation of the flat steel product insufficient for optimum forming properties would be achieved.
- the values for the roughness Ra and the peak number RPc which are predetermined according to the invention could not be achieved.
- a D grade of more than 0.7% there would be a risk that too high
- Solidification is introduced into the steel strip, which in turn would have a negative impact on the forming properties. Furthermore, a skin pass roughness D of more than 0.7% could lead to a roughness Ra that is outside of the desired surface properties
- predetermined range of roughness For particularly wide flat steel products, d. H.
- the D grade D can be set to at least 0.5%. Should any negative effect of
- a surface structure corresponding to the inventive specifications optimized with regard to the coating properties is impressed into the surface of the flat steel product by temper rolling in the surface of the flat steel product has a roughness Ra of 1.0 - 2.5 ym and a peak number RPc of at least 100 per cm. If the roughness Ra of the work roll was less than 1.0 ym or greater than 2.5 ym, then on the
- Roughness values Ra on the flat steel product can be reliably achieved, the roughness Ra of the skin pass rolling mill can be adjusted to 1.2-2.3 ⁇ m.
- the peak number RPc of the skin pass mill surface is at least 100 per cm, with higher peak numbers RPc, such as peak number RPc of the stripper, of at least 110 per cm, in particular more than 130 per cm, being particularly advantageous.
- EDT Electro Discharge Texturing
- the EDT technique is based on roughening the surface of the roll by spark erosion.
- the skin pass mill is guided past an electrode in a tank in which a dielectric is located.
- the cap (-) variant of the EDT technique is based on a
- Capacitor discharge that occurs when the electrode is close enough to the roller.
- the cap process produces a stochastic texture on the work rolls as the capacitor capacity varies widely
- the pulse (+) variant of the EDT technique is based on a principle in which always the same amount of energy is applied to the roller to be textured. This forms a stochastic surface texture with larger
- the work roll according to the invention can optionally undergo a post-treatment.
- a post-treatment In this, strong prominent tips of the
- the post-treatment can be carried out as a SuperFinish treatment.
- This is a microfinishing process with the aim of removing peaks that are above the mean value of the surface roughness or reducing their number to a minimum.
- Possibilities of the practical implementation of the SuperFinish process are known, for example, from DE 10 2004 013 031 A1 or EP 2 006 037 Bl.
- the number of tips is changing the respective post-treatment negligible.
- the roughness is unevenly distributed, whereas low or negative Rsk values are associated with a very uniform roughness distribution.
- temper mill rollers may be hard chrome plated prior to their use in a known manner to optimize their wear resistance.
- step c) of the cooled after the step b) and exiting the heat treatment device steel flat product is then carried out in a single skin pass. If the temper rolling is off-line, d. H. can be performed regardless of the course of the heat treatment, also several temper rolling passes can be carried out, which also shows that optimum results are achieved when the off-line temper rolling in just one pass
- dry-drawing can have the advantage that the flat steel product does not come into contact with any wetting medium and as a result also the risk of
- Corrosion is minimized in a subsequent storage or further processing of the flat steel product.
- FIG. 1 shows a detail of a painted surface of an automobile body component formed from a flat steel product according to the invention
- Fig. 2 shows a detail of a painted surface of a non-inventive
- Fig. 3 shows the schematic course of an inventive
- step b These are cold - rolled, flat rolled steel flat products in the form of steel strips Bl - B12 made of steel Sl - S6
- the flat steel products were heat treated in various dimensions in a continuous RTF type heat treatment furnace, then cooled to room temperature and then roll-formed in-line.
- the heat treatment comprises a recrystallizing
- Holding temperature Tl of 835 ° C ⁇ 15 ° C have been heated, on which they have been held over a holding time Tl of 60 s.
- the steel strips Bl - B12 were subjected to an overaging treatment. For this they are from the holding temperature Tl with a cooling rate CR1 of 8.5 ° C / s to a
- the steel strips Bl - B12 were then each cooled over an overaging period t2 of 302 seconds to an over - aging end temperature T3 which was 280 ⁇ 15 ° C.
- the cooling rate CR2 with which the steel belts Bl - B12 of the
- the temper rolling rollers of the temper rolling stand were always roughened in cap (-) mode by means of EDT technology and subjected to hard chrome plating in a manner known per se. All temper rolling tests were carried out without the use of a skin-pass agent (dry-dressing).
- the non-inventive steel bands Bll and B12 prove the importance of the degree of temperament for the success of
- Embodiments of the invention achieve a Wsa value ⁇ 0.40 ym and thus provide optimum conditions for a particularly good gloss finish.
- the measurement of the waviness characteristic value Wsa was carried out according to Stahl-Eisen-Prüfblatt (SEP) 1941, which was measured on a steel sample, which underwent 5% plastic elongation in the Marciniak deepening test.
- FIG. 1 and Fig. 2 illustrate this with reference to a
- FIG. 2 Flat steel product produced by forming and painting.
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL15762569.0T PL3204530T5 (pl) | 2014-10-09 | 2015-09-09 | Walcowany na zimno i wyżarzany rekrystalizująco płaski wyrób stalowy oraz sposób jego wytwarzania |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14188314 | 2014-10-09 | ||
| PCT/EP2015/070577 WO2016055227A1 (de) | 2014-10-09 | 2015-09-09 | Kaltgewalztes und rekristallisierend geglühtes stahlflachprodukt und verfahren zu seiner herstellung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP3204530A1 true EP3204530A1 (de) | 2017-08-16 |
| EP3204530B1 EP3204530B1 (de) | 2019-01-09 |
| EP3204530B2 EP3204530B2 (de) | 2024-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15762569.0A Active EP3204530B2 (de) | 2014-10-09 | 2015-09-09 | Kaltgewalztes und rekristallisierend geglühtes stahlflachprodukt und verfahren zu dessen herstellung |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US10683560B2 (de) |
| EP (1) | EP3204530B2 (de) |
| JP (1) | JP6636512B2 (de) |
| KR (1) | KR102462210B1 (de) |
| CN (1) | CN106795575B (de) |
| BR (1) | BR112017007273B1 (de) |
| CA (1) | CA2961427C (de) |
| ES (1) | ES2716937T5 (de) |
| MX (1) | MX2017004593A (de) |
| PL (1) | PL3204530T5 (de) |
| TR (1) | TR201905219T4 (de) |
| WO (1) | WO2016055227A1 (de) |
| ZA (1) | ZA201701938B (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016055227A1 (de) | 2014-10-09 | 2016-04-14 | Thyssenkrupp Steel Europe Ag | Kaltgewalztes und rekristallisierend geglühtes stahlflachprodukt und verfahren zu seiner herstellung |
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| DE102017103303A1 (de) * | 2017-02-17 | 2018-08-23 | Voestalpine Stahl Gmbh | Verfahren zum Herstellen von Stahlblechen |
| DE102017103308A1 (de) * | 2017-02-17 | 2018-08-23 | Voestalpine Stahl Gmbh | Verfahren zum Herstellen von Stahlblechen |
| EP3583239B1 (de) * | 2017-02-17 | 2021-05-19 | voestalpine Stahl GmbH | Verfahren zum herstellen von stahlblechen, stahlblech und dessen verwendung |
| DE102017218704A1 (de) * | 2017-10-19 | 2019-04-25 | Thyssenkrupp Ag | Verfahren zur Herstellung eines mit einem metallischen, vor Korrosion schützenden Überzug versehenen Stahlbauteils |
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-
2015
- 2015-09-09 EP EP15762569.0A patent/EP3204530B2/de active Active
- 2015-09-09 CA CA2961427A patent/CA2961427C/en active Active
- 2015-09-09 CN CN201580054737.4A patent/CN106795575B/zh active Active
- 2015-09-09 TR TR2019/05219T patent/TR201905219T4/tr unknown
- 2015-09-09 MX MX2017004593A patent/MX2017004593A/es unknown
- 2015-09-09 US US15/518,167 patent/US10683560B2/en active Active
- 2015-09-09 PL PL15762569.0T patent/PL3204530T5/pl unknown
- 2015-09-09 KR KR1020177012453A patent/KR102462210B1/ko active Active
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- 2015-09-09 ES ES15762569T patent/ES2716937T5/es active Active
- 2015-09-09 WO PCT/EP2015/070577 patent/WO2016055227A1/de not_active Ceased
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016055227A1 (de) | 2014-10-09 | 2016-04-14 | Thyssenkrupp Steel Europe Ag | Kaltgewalztes und rekristallisierend geglühtes stahlflachprodukt und verfahren zu seiner herstellung |
Also Published As
| Publication number | Publication date |
|---|---|
| PL3204530T3 (pl) | 2019-07-31 |
| CN106795575B (zh) | 2018-08-28 |
| BR112017007273A2 (pt) | 2018-01-23 |
| MX2017004593A (es) | 2017-07-10 |
| PL3204530T5 (pl) | 2024-12-02 |
| EP3204530B2 (de) | 2024-10-09 |
| EP3204530B1 (de) | 2019-01-09 |
| US10683560B2 (en) | 2020-06-16 |
| CA2961427C (en) | 2019-01-08 |
| WO2016055227A1 (de) | 2016-04-14 |
| JP2017534758A (ja) | 2017-11-24 |
| ES2716937T5 (en) | 2025-02-12 |
| US20170306430A1 (en) | 2017-10-26 |
| JP6636512B2 (ja) | 2020-01-29 |
| KR102462210B1 (ko) | 2022-11-03 |
| ES2716937T3 (es) | 2019-06-18 |
| ZA201701938B (en) | 2022-05-25 |
| CN106795575A (zh) | 2017-05-31 |
| KR20170067839A (ko) | 2017-06-16 |
| BR112017007273B1 (pt) | 2021-03-09 |
| CA2961427A1 (en) | 2016-04-14 |
| TR201905219T4 (tr) | 2019-05-21 |
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