EP0703298A1 - Verfahren zum Herstellen von Stählen guter Verformbar- und Formbeständigkeit - Google Patents
Verfahren zum Herstellen von Stählen guter Verformbar- und Formbeständigkeit Download PDFInfo
- Publication number
- EP0703298A1 EP0703298A1 EP95401923A EP95401923A EP0703298A1 EP 0703298 A1 EP0703298 A1 EP 0703298A1 EP 95401923 A EP95401923 A EP 95401923A EP 95401923 A EP95401923 A EP 95401923A EP 0703298 A1 EP0703298 A1 EP 0703298A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- annealing
- temperature
- carbon
- sheet
- 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.)
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Classifications
-
- 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
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
Definitions
- the present invention relates to a method of manufacturing a mild low carbon steel having good formability and good resistance to indentation, as well as a sheet obtained by this method.
- the non-deformed parts retain their initial elastic limit Re and the deformed parts have an increased elastic limit due to the hardening they have undergone.
- these elements When these elements are shaped, they are generally painted and undergo a heat treatment in order to cure the paint.
- the elastic limit of the element may increase, which results in a significant hardening of said element.
- the steel sheet used from the cold rolled and annealed coil must have the lowest possible elastic limit Re to facilitate shaping, and also that on the finished part, that is to say after the paint has cured, the elastic limit Re is raised so that the part has good resistance to indentation, of the gravel type or marking of surfaces by contact with small objects (typical case of the contact of the key around the lock on an automobile door), and in order to reduce its thickness and thus reduce its weight, which is a very important factor in the automotive field.
- a first solution for obtaining a steel having a good BH property consists in developing a steel calmed with aluminum, without addition of titanium, nor niobium, either in continuous annealing, or in base annealing, with possibly addition of phosphorus and / or manganese and / or silicon.
- This type of steel allows an increase in the elastic limit due to BH of the order of 40 MPa.
- the disadvantage of this solution is that the steel obtained is an aging steel, and if a higher level of BH property is desired, the steel will be even more aging and will have too much carbon in solution.
- a second solution consists in producing an IF steel under stoichiometric in continuous annealing.
- These steels are produced by adding titanium and / or niobium, which will precipitate with nitrogen and carbon from the steel, in the form, among other things, of titanium nitride, titanium carbide and / or niobium. .
- Controlling the content of titanium and / or niobium as well as carbon and nitrogen makes it possible to control, during the production of steel, the carbon content remaining in solution in the steel.
- a third solution consists in developing the steel by so-called IF CHRX.
- These steels are produced by adding titanium and / or niobium, in quantities such that they allow all of the nitrogen and carbon in solution to be trapped. This steel is then continuously annealed at a temperature above 850 ° C and cools very quickly at a speed above 80 ° C per second.
- This solution also often leads to a medium level of the BH property of the steel in order to overcome the aging problem.
- the present invention relates to a method of manufacturing a mild steel which overcomes these drawbacks and improves the aging / BH property compromise.
- the present invention relates more particularly to a process for manufacturing a low carbon mild steel sheet by rolling with hot of a slab, then cold rolling of the hot-rolled sheet, and annealing of the cold-rolled sheet, characterized in that the annealing of the cold-rolled sheet is an annealing of recrystallization and dissolution of the carbon contained in the steel, followed by a possible over-aging stage such that the dissolved carbon content is greater than a determined value, and in that after this annealing, or subjecting the sheet to a second annealing at low temperature which precipitates the carbon in solution in the form of iron carbide, and a hardening operation is carried out by light rolling, called a "skin-pass".
- the present invention also relates to a low carbon mild steel sheet obtained by this process.
- the invention relates to a method for manufacturing a low carbon mild steel sheet by hot rolling a slab, then cold rolling the hot rolled sheet, and annealing the cold rolled sheet.
- the invention consists in carrying out after cold rolling a first continuous annealing which makes it possible to dissolve the carbon contained in the steel followed by a possible overaging stage which reprecipitates the carbon in solution while limiting the drop in the carbon content in solution in the steel to 6 ppm, and then to carry out a second annealing at low temperature which precipitates the carbon in solution in the form of carbide iron, and a hardening operation is carried out by light rolling called "skin-pass".
- Low carbon mild steel is a steel having the following composition in thousandths of a weight percent: carbon 1 at 100 phosphorus 0 at 100 aluminum 10 at 100 manganese 0 at 1000 nitrogen 1 at 10 silicon 0 at 1000 sulfur 0 at 25, the rest being iron and residuals from the production process.
- the cycle of the first annealing consists of raising the temperature of the sheet to a temperature t1 between 750 and 900 ° C and maintaining this temperature for a period of 30 seconds to 10 minutes, then cooling the sheet up to a temperature t2 and to maintain this temperature t2 for a determined time to achieve an over-aging plateau.
- the overaging stage is not necessarily isothermal, but, as shown in FIG. 1, we can admit a change in temperature during this level.
- the conditions of temperature t2 and of duration of the overage plateau are, as seen in FIG. 2, included in the unshaded domain represented on a duration / temperature graph by the rectangle defined by the abscissae 0 and 2 mm and the ordinates 0 and 850 ° C, except for the hatched portion A delimited by points A1, A2, A3, A4, A1, whose duration / temperature coordinates are as follows: A1: 15 mins. 440 ° C A2: 40 sec. 440 ° C A3: 40 sec. 350 ° C A4: 15 mins. 250 ° C
- the curve connecting points A3 and A4 is not a straight line like that connecting points A1 to A2, A2 to A3 and A4 to A1, but is curvilinear.
- the overaging stage can be completely eliminated, the point of coordinates (0,0) being part of the domain.
- the speed of cooling of the sheet to pass from the annealing temperature t1 to that of the cooling level t2 and after the cooling level is not of great importance in the process according to the invention and can for example be between 1 and 1000 ° C.
- the conditions of temperature and duration of the second annealing at low temperature are included in the domain represented on a duration / temperature curve by the portion B not hatched delimited by points B1, B2, B3, B4, B5, B6, B1 whose duration / temperature coordinates are as follows: B1: 1 hr 50 ° C B2: 3 mins 170 ° C B3: 8 p.m. 170 ° C B4: 48 h 120 ° C B5: 100 h 120 ° C B6: 100 h 40 ° C
- the second annealing takes place at a temperature of the order of 75 ° C for a long period of the order of 25 hours.
- This second annealing at low temperature makes it possible to precipitate part of the carbon in solution in the form of iron carbide and therefore to reduce the carbon content in solution, which allows the steel to have good aging properties and therefore does not not degrade too much during storage.
- part of the iron carbide will dissolve to reform the carbon in solution, which results in good BH property.
- the invention therefore consists in limiting the drop in the carbon content in solution during the first annealing in order to keep a content of the order of 10 to 15 ppm, then transforming this carbon into solution into iron carbide during second annealing, to reform a sufficient quantity of carbon in solution after curing the paint in order to give the part after curing the paint good BH properties.
- Iron carbides that are not redissolved have a beneficial influence on the BH property.
- This steel after cold rolling underwent a first annealing at 800 ° C with an overaging plateau at 400 ° C for 30 seconds.
- Each sample was then subjected to a heat treatment similar to that of painting paint, ie at 170 ° C. for 20 minutes.
- the BH2 was also calculated, that is to say the BH at 2% deformation.
- the specimen produced after the first heat treatment was stretched to lengthen it by 2% and the baking heat treatment was carried out.
- Each sample was stored for 30 days at room temperature to control their aging.
- the work hardening coefficient was measured after 6 days, 9 days, 15 days, 22 days and 30 days.
- the work hardening coefficient does not change significantly over time and remains high, which means that the natural aging of the mechanical characteristics remains limited.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9411481A FR2724946B1 (fr) | 1994-09-23 | 1994-09-23 | Procede de fabrication d'un acier presentant une bonne aptitude a la mise en forme et une bonne resistance a l'indentation |
| FR9411481 | 1994-09-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0703298A1 true EP0703298A1 (de) | 1996-03-27 |
| EP0703298B1 EP0703298B1 (de) | 2002-11-20 |
Family
ID=9467287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95401923A Expired - Lifetime EP0703298B1 (de) | 1994-09-23 | 1995-08-22 | Verfahren zum Herstellen von Stählen guter Verformbar- und Formbeständigkeit |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5645656A (de) |
| EP (1) | EP0703298B1 (de) |
| AT (1) | ATE228174T1 (de) |
| DE (1) | DE69528874T2 (de) |
| DK (1) | DK0703298T3 (de) |
| ES (1) | ES2187544T3 (de) |
| FR (1) | FR2724946B1 (de) |
| PT (1) | PT703298E (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999014384A1 (de) * | 1997-09-12 | 1999-03-25 | Thyssen Krupp Stahl Ag | Verfahren zur erzeugung von einbrennlackierten bauteilen aus alterungsempfindlichem stahl |
| FR2790009A1 (fr) * | 1999-02-22 | 2000-08-25 | Lorraine Laminage | Acier dual-phase a haute limite d'elasticite |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7419496B2 (en) * | 2004-08-03 | 2008-09-02 | Staudner Rupert A | Trocar with retractable cutting surface |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3936324A (en) * | 1975-03-14 | 1976-02-03 | Nippon Kokan Kabushiki Kaisha | Method of making high strength cold reduced steel by a full continuous annealing process |
| FR2291277A1 (fr) * | 1974-11-18 | 1976-06-11 | Nippon Kokan Kk | Procede pour l'elaboration d'une tole d'acier laminee a froid de haute resistance ayant une bonne aptitude au durcissement par recuit et une excellente propriete de non-vieillissement |
| GB2085331A (en) * | 1980-09-25 | 1982-04-28 | Nippon Steel Corp | Process for producing cold rolled steel strip useful for motor vehicles |
| EP0075803A1 (de) * | 1981-09-19 | 1983-04-06 | Nippon Steel Corporation | Verfahren zur Herstellung von kaltgewalzten Stahlblechen mit hervorragender Pressverformbarkeit und Alterungsverhalten |
| EP0521808A1 (de) * | 1991-07-04 | 1993-01-07 | Sollac | Verfahren zum Herstellen von Tiefziehblechen |
| EP0581629A1 (de) * | 1992-07-23 | 1994-02-02 | Sollac | Stahlblech für Abstrecktiefziehen und Verfahren zur Herstellung dieser Bleche |
-
1994
- 1994-09-23 FR FR9411481A patent/FR2724946B1/fr not_active Expired - Fee Related
-
1995
- 1995-08-22 EP EP95401923A patent/EP0703298B1/de not_active Expired - Lifetime
- 1995-08-22 AT AT95401923T patent/ATE228174T1/de active
- 1995-08-22 PT PT95401923T patent/PT703298E/pt unknown
- 1995-08-22 DK DK95401923T patent/DK0703298T3/da active
- 1995-08-22 ES ES95401923T patent/ES2187544T3/es not_active Expired - Lifetime
- 1995-08-22 DE DE69528874T patent/DE69528874T2/de not_active Expired - Lifetime
- 1995-09-13 US US08/528,210 patent/US5645656A/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2291277A1 (fr) * | 1974-11-18 | 1976-06-11 | Nippon Kokan Kk | Procede pour l'elaboration d'une tole d'acier laminee a froid de haute resistance ayant une bonne aptitude au durcissement par recuit et une excellente propriete de non-vieillissement |
| US3936324A (en) * | 1975-03-14 | 1976-02-03 | Nippon Kokan Kabushiki Kaisha | Method of making high strength cold reduced steel by a full continuous annealing process |
| GB2085331A (en) * | 1980-09-25 | 1982-04-28 | Nippon Steel Corp | Process for producing cold rolled steel strip useful for motor vehicles |
| EP0075803A1 (de) * | 1981-09-19 | 1983-04-06 | Nippon Steel Corporation | Verfahren zur Herstellung von kaltgewalzten Stahlblechen mit hervorragender Pressverformbarkeit und Alterungsverhalten |
| EP0521808A1 (de) * | 1991-07-04 | 1993-01-07 | Sollac | Verfahren zum Herstellen von Tiefziehblechen |
| EP0581629A1 (de) * | 1992-07-23 | 1994-02-02 | Sollac | Stahlblech für Abstrecktiefziehen und Verfahren zur Herstellung dieser Bleche |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999014384A1 (de) * | 1997-09-12 | 1999-03-25 | Thyssen Krupp Stahl Ag | Verfahren zur erzeugung von einbrennlackierten bauteilen aus alterungsempfindlichem stahl |
| US6726786B1 (en) | 1997-09-12 | 2004-04-27 | Thyssen Krupp Stahl Ag | Process for the production of stove-finished structural components from ageing-sensitive steel |
| FR2790009A1 (fr) * | 1999-02-22 | 2000-08-25 | Lorraine Laminage | Acier dual-phase a haute limite d'elasticite |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69528874D1 (de) | 2003-01-02 |
| FR2724946A1 (fr) | 1996-03-29 |
| PT703298E (pt) | 2003-03-31 |
| EP0703298B1 (de) | 2002-11-20 |
| US5645656A (en) | 1997-07-08 |
| ES2187544T3 (es) | 2003-06-16 |
| FR2724946B1 (fr) | 1996-12-13 |
| DK0703298T3 (da) | 2003-03-17 |
| DE69528874T2 (de) | 2003-07-17 |
| ATE228174T1 (de) | 2002-12-15 |
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