EP0835945B1 - Tôle d'acier laminé à chaud pour emboutissage profond - Google Patents
Tôle d'acier laminé à chaud pour emboutissage profond Download PDFInfo
- Publication number
- EP0835945B1 EP0835945B1 EP97402089A EP97402089A EP0835945B1 EP 0835945 B1 EP0835945 B1 EP 0835945B1 EP 97402089 A EP97402089 A EP 97402089A EP 97402089 A EP97402089 A EP 97402089A EP 0835945 B1 EP0835945 B1 EP 0835945B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- nickel
- boron
- copper
- titanium
- 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.)
- Expired - Lifetime
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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
- 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
- C21D8/0426—Hot rolling
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
Definitions
- the present invention relates to a hot-rolled steel sheet for deep drawing, from a band train.
- steels with the best stamping properties are steels called 3C and 3C Ti.
- These steels have compositions containing carbon, manganese, titanium and have very high levels of additives weak to soften the mechanical properties. They own nevertheless gamagenic elements such as carbon and manganese whose contents are high enough to have a temperature of relatively low ferritic transformation, such as, for example, AR3 transformation temperature of 840 ° C for a thickness of 4.5 mm. It is necessary to laminate above this temperature, i.e. in the austenitic area to avoid laminating in the area two-phase austenite-ferrite, rolling domain which degrades the properties steel shaping.
- the sheets made with these steels can be coated continuously on a galvanizing line to protect them against corrosion.
- This coating method results in the sheets being subjected to a cycle thermal which causes in the steel of said sheets, by diffusion of carbon and nitrogen, an increase in the yield strength of steel and a decrease in its elongation.
- the object of the invention is to provide a steel sheet having a on the other hand, high shaping properties for deep drawing, and secondly, comparable mechanical properties after rolling to hot and after continuous galvanizing.
- FIG. 1 shows the influence of the contents of carbon elements, boron, copper plus nickel on the lowering of the AR3 transformation point.
- Figure 2 shows the evolution of AR3 as a function of temperature for a steel containing 0.002% boron and a steel not containing no boron.
- FIG. 3 shows the evolution of sheet metal processing in its production process.
- the transformation point is lowered by the copper, nickel elements and boron without the hardening of the structure.
- FIG. 1 shows the influence of the contents of carbon elements, boron, copper plus nickel on the lowering of the AR3 transformation point.
- Copper and nickel provide sheet steel with improved corrosion resistance.
- Carbon at a content of less than 0.08%, makes it possible to obtain good formatting properties.
- Low carbon content ensures a limitation of the hardening of the matrix due to a low rate of carburetted phases.
- titanium in over-stoichiometry (3.4 ⁇ Ti / N ⁇ 10) precipitates during cooling in the form of titanium carbide and thus traps part of the carbon in the steel.
- the Ti / N ratio must remain less than 10 to avoid precipitation hardening of carbide titanium.
- titanium content should therefore be limited to avoid hardening by the precipitates.
- titanium precipitated in the form of TIC can be an advantage for steels for enameling because it allows the conservation of mechanical properties after sheet metal shaping and thermal enamelling treatment.
- boron in particular is to control the germination and growth of ferrite and thus obtain good setting properties shape, properties which are characterized by an elongation of the steel improved.
- Boron on the other hand precipitates with carbon in the form of borocarbons or segregations at grain boundaries.
- the starting point of ferritic transformation decreases with increasing temperature rolling.
- two-phase rolling leads to type defects orange peel on the surface linked to the magnification of the ferritic grain with degraded formatting properties.
- Figure 2 shows the evolution of AR3 as a function of temperature for a steel containing 0.002% boron and a steel not containing no boron.
- boron helps control the ferritic transformation start temperature in association with end of rolling temperature.
- titanium and boron allows their precipitation to keep the mechanical properties obtained after hot rolling at during heat treatment on galvanizing line.
- the rolling temperature is chosen so that it is 10 ° C to 120 ° C higher than the point value AR3 transformation to avoid rolling in the austenite domain ferrite unfavorable for shaping properties.
- Figure 3 shows the evolution of the heat treatment of the sheet in its manufacturing process.
- a time of less than 10 seconds is necessary before the first cooling heat treatment, the cooling being carried out with a speed of between 3 ° C / s and 80 ° C / s depending on the thickness of the laminated sheet, which ensures 80 ° C / s depending on the thickness of the laminated sheet, which ensures controlled and homogeneous germination of ferrite.
- the structure final composed of cementite ferrite ensures, on the one hand, resistance mechanical between 250 MPa and 370 MPa and, on the other hand, a limit between 180 MPa and 280 MPa as well as an elongation more than 30%.
- the hot rolling temperature is chosen at the point value transformation AR3 plus 20 ° C. Cooling started 1.5 second after hot rolling is performed at 30 ° C per second until a temperature of 680 ° C. Elongations of hot rolled sheet according to the invention can reach 36% for sheet thicknesses between 1.8 and 2.8 mm and values greater than 40% for sheet thicknesses between 3 and 8 mm.
- Table 1 shows two other compositions of the steel sheet according to the invention. VS mn Cu Or al Ti NOT B Sheet A 0.044 0.274 0.406 0.214 0.031 0,021 0.0042 0.0027 Sheet B 0,040 0.267 0.202 0.098 0,028 0,019 0.0042 0.0020
- the temperature at the start of the AR3 ferritic transformation, respectively for sheet A and sheet B, is 818 ° C and 842 ° C.
- thermomechanical treatment of the two sheets according to the invention involves rolling at a temperature of 900 ° C, winding at a temperature of 700 ° C., the cooling of the sheets having been carried out at a speed of 25 ° C per second.
- Table 2 presents the mechanical characteristics of the two examples of sheets A and B. Re (MPA) Rm (MPa) AT (%) Sheet A 246 344 43 Sheet B 244 328 43.4
- Table 3 presents, for a sheet A, the so-called raw mechanical characteristics obtained before thermal galvanizing treatment and the mechanical characteristics after thermal galvanizing treatment at 700 ° C. and 600 ° C.
- Raw sheet metal 700 ° C. 600 ° C Re (MPa) 246 262 246 Rm (MPa) 344 350 348 AT (%) 43 43.3 36.3
- the rate of temperature rise is between 3 ° C / s and 20 ° C / s, speed generally being 8 ° C / s.
- the holding temperature is between 550 ° C and 850 ° C, the current temperature being 700 ° C, with a holding time of 20 s to 120 s and preferably 60 s.
- This temperature rise is followed by cooling at a rate between 3 ° C / s and 25 ° C / s, the typical speed value cooling being 10 ° C / s. Cooling is carried out until temperature of the galvanizing bath, at 450 ° C.
- the steel sheet according to the invention comprises, for a thickness between 1.5 mm and 8 mm of the mechanical characteristics comparable between the raw state of hot rolling and the galvanized state.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
- la teneur en nickel est sensiblement égale à la moitié de la teneur en cuivre.
- un laminage à chaud à une température supérieure à la température de transformation AR3,
- un refroidissement commençant dans un intervalle de temps inférieur à 10 secondes après le laminage à chaud, le refroidissement étant, d'une part, compris entre 3°C par seconde et 80°C par seconde, et, d'autre part, effectué jusqu'à une température comprise entre 600°C et 750°C.
- le laminage à chaud est effectué à une température comprise dans un intervalle de 10°C à 120°C au-dessus de la température de transformation AR3.
C | Mn | Cu | Ni | Al | Ti | N | B | |
Tôle A | 0,044 | 0,274 | 0,406 | 0,214 | 0,031 | 0,021 | 0,0042 | 0,0027 |
Tôle B | 0,040 | 0,267 | 0,202 | 0,098 | 0,028 | 0,019 | 0,0042 | 0,0020 |
Re (MPA) | Rm (MPa) | A (%) | |
Tôle A | 246 | 344 | 43 |
Tôle B | 244 | 328 | 43,4 |
Tôle brute | 700°C | 600°C | |
Re (MPa) | 246 | 262 | 246 |
Rm (MPa) | 344 | 350 | 348 |
A (%) | 43 | 43,3 | 36,3 |
Claims (5)
- Tôle d'acier laminé à chaud pour emboutissage profond, caractérisée en la composition pondérale suivante :0,010%< carbone < 0,080%0,1 < manganèse < 0,5%0,02% < aluminium < 0,08%silicium < 0,1%phosphore < 0,04%soufre < 0,025%titane < 0,05%azote < 0,009%0,001% < bore < 0,01%0,1 < cuivre < 0,8%0,05% < nickel < 0,6%,
- Tôle selon la revendication 1, caractérisée en ce que la teneur en nickel est sensiblement égale à la moitié de la teneur en cuivre.
- Tôle selon les revendications 1 et 2, caractérisée en la composition suivante :0,020%< carbone < 0,040%0,15 < manganèse < 0,25%0,02% < aluminium < 0,04%0,02 < silicium < 0,04%phosphore < 0,02%soufre < 0,005%titane < 0,02%azote < 0,009%0,002% < bore < 0,004%0,30% < cuivre < 0,40%0,15% < nickel < 0,20%,
- Procédé de fabrication d'une tôle d'acier selon les revendications 1 à 3, caractérisé en ce que l'acier ayant la composition pondérale suivante :0,010%< carbone < 0,080%0,1 < manganèse < 0,5%0,02% < aluminium < 0,08%silicium < 0,1%phosphore < 0,04%soufre < 0,025%titane < 0,05%azote < 0,009%0,001% < bore < 0,01%0,1 < cuivre < 0,8%0,05% < nickel < 0,6%,un laminage à chaud à une température supérieure à la température de transformation AR3,un refroidissement commençant dans un intervalle de temps inférieur à 10 secondes après le laminage à chaud, le refroidissement étant, d'une part, compris entre 3°C par seconde et 80°C par seconde, et, d'autre part, effectué jusqu'à une température comprise entre 600°C et 750°C.
- Procédé selon la revendication 4, caractérisé en ce que le laminage à chaud est effectué à une température comprise dans un intervalle de 10°C à 120°C au-dessus de la température de transformation AR3.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9611413 | 1996-09-19 | ||
FR9611413A FR2753399B1 (fr) | 1996-09-19 | 1996-09-19 | Tole d'acier lamine a chaud pour emboutissage profond |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0835945A1 EP0835945A1 (fr) | 1998-04-15 |
EP0835945B1 true EP0835945B1 (fr) | 2003-03-19 |
Family
ID=9495878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97402089A Expired - Lifetime EP0835945B1 (fr) | 1996-09-19 | 1997-09-08 | Tôle d'acier laminé à chaud pour emboutissage profond |
Country Status (11)
Country | Link |
---|---|
US (1) | US5873957A (fr) |
EP (1) | EP0835945B1 (fr) |
JP (1) | JPH10102198A (fr) |
KR (1) | KR19980024716A (fr) |
AT (1) | ATE234944T1 (fr) |
CA (1) | CA2215570A1 (fr) |
DE (1) | DE69719898T2 (fr) |
DK (1) | DK0835945T3 (fr) |
ES (1) | ES2193338T3 (fr) |
FR (1) | FR2753399B1 (fr) |
PT (1) | PT835945E (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3524790B2 (ja) * | 1998-09-30 | 2004-05-10 | 株式会社神戸製鋼所 | 塗膜耐久性に優れた塗装用鋼材およびその製造方法 |
EP2166122A1 (fr) * | 1999-09-16 | 2010-03-24 | JFE Steel Corporation | Procede de fabrication d'un acier tres resistant |
FR2798676B1 (fr) * | 1999-09-20 | 2001-10-26 | Lorraine Laminage | Tole d'acier lamine a chaud pour emaillage une ou deux faces |
US7005016B2 (en) * | 2000-01-07 | 2006-02-28 | Dofasco Inc. | Hot rolled steel having improved formability |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2133744B2 (de) * | 1971-07-07 | 1973-07-12 | August Thyssen-Hütte AG, 4100 Duisburg | Die verwendung eines vollberuhigten stahles fuer gegenstaende aus warmgewalztem band |
US4080225A (en) * | 1976-10-08 | 1978-03-21 | Alan Wood Steel Company | Low temperature, weldable, low alloy steel |
EP0320003B1 (fr) * | 1987-12-11 | 1992-08-26 | Nippon Steel Corporation | Procédé de fabrication d'acier à bas rapport de la limite d'élasticité à la résistance à la rupture |
DE69325644T2 (de) * | 1992-10-30 | 2000-04-13 | Japan Casting Forging Corp | Hochfestes warmgewalztes Stahlblech mit hervorragender gleichmässiger Dehnung nach der Kaltverformung und Verfahren zu dessen Herstellung |
US5454883A (en) * | 1993-02-02 | 1995-10-03 | Nippon Steel Corporation | High toughness low yield ratio, high fatigue strength steel plate and process of producing same |
JP3550729B2 (ja) * | 1994-05-20 | 2004-08-04 | 住友金属工業株式会社 | 成形加工性,耐食性,焼付硬化能に優れた熱延鋼板の製造方法 |
-
1996
- 1996-09-19 FR FR9611413A patent/FR2753399B1/fr not_active Expired - Fee Related
-
1997
- 1997-09-08 DE DE69719898T patent/DE69719898T2/de not_active Expired - Fee Related
- 1997-09-08 ES ES97402089T patent/ES2193338T3/es not_active Expired - Lifetime
- 1997-09-08 PT PT97402089T patent/PT835945E/pt unknown
- 1997-09-08 EP EP97402089A patent/EP0835945B1/fr not_active Expired - Lifetime
- 1997-09-08 AT AT97402089T patent/ATE234944T1/de not_active IP Right Cessation
- 1997-09-08 DK DK97402089T patent/DK0835945T3/da active
- 1997-09-11 CA CA002215570A patent/CA2215570A1/fr not_active Abandoned
- 1997-09-18 KR KR1019970047570A patent/KR19980024716A/ko not_active Application Discontinuation
- 1997-09-19 US US08/933,349 patent/US5873957A/en not_active Expired - Fee Related
- 1997-09-19 JP JP9273467A patent/JPH10102198A/ja not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DK0835945T3 (da) | 2003-06-23 |
PT835945E (pt) | 2003-06-30 |
EP0835945A1 (fr) | 1998-04-15 |
DE69719898D1 (de) | 2003-04-24 |
JPH10102198A (ja) | 1998-04-21 |
KR19980024716A (ko) | 1998-07-06 |
US5873957A (en) | 1999-02-23 |
ES2193338T3 (es) | 2003-11-01 |
DE69719898T2 (de) | 2004-03-04 |
CA2215570A1 (fr) | 1998-03-19 |
ATE234944T1 (de) | 2003-04-15 |
FR2753399A1 (fr) | 1998-03-20 |
FR2753399B1 (fr) | 1998-10-16 |
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