USRE44940E1 - Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment - Google Patents
Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment Download PDFInfo
- Publication number
- USRE44940E1 USRE44940E1 US13/863,100 US201313863100A USRE44940E US RE44940 E1 USRE44940 E1 US RE44940E1 US 201313863100 A US201313863100 A US 201313863100A US RE44940 E USRE44940 E US RE44940E
- Authority
- US
- United States
- Prior art keywords
- steel sheet
- coated steel
- aluminum
- sheet
- hot
- 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
Links
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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/922—Static electricity metal bleed-off metallic stock
- Y10S428/9335—Product by special process
- Y10S428/939—Molten or fused coating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/1275—Next to Group VIII or IB metal-base component
- Y10T428/12757—Fe
Definitions
- the invention relates to a coated, hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment.
- the proposed solutions involving an increase in the mechanical characteristics are accomplished to the detriment of shaping properties.
- the characteristics required for use are obtained through a thermal treatment subsequent to or concomitant with shaping.
- the proposed sheets are not delivered coated because of problems of holding power of the coating at the time of thermal treatment. Coating therefore is performed on finished castings, which requires a careful cleaning of the surfaces and the hollowed portions.
- the thermal treatment must be performed under a controlled atmosphere in order to prevent any decarbonization and oxidation of the metal in the sheet.
- Steel sheets for thermal treatment do not have any precoating which requires post-treatments of scouring, pickling and coating.
- preliminary annealing and cooling preceding or following the zinc- or aluminum-based coating operation are used only to bring the sheet to a temperature close to that of the bath or to restore the mechanical properties of the sheet degraded at the time of cold-rolling.
- These thermal cycles are chosen in terms of the composition of the steel so that no allotropic transformation takes place at the time of the thermal cycle, the objective being to obtain mechanical characteristics similar to those measured on the steel sheet delivered uncoated.
- the purpose of the invention is to produce a hot- or cold-rolled steel sheet of a desired thickness, coated, and affording extensive shaping possibilities and which, after thermal treatment performed on the finished casting, makes it possible to obtain a mechanical resistance in excess of 1000 MPa, a substantial resistance to shocks, fatigue, abrasion and wear, while retaining a good resistance to corrosion as well as a good capacity for painting and gluing. It also is possible to carry out hot-shaping with hardening in the tool making it possible to obtain the same properties.
- the subject of the invention is a hot-rolled steel sheet, which then can be cold-rolled, coated, the steel in the sheet having the following composition by weight:
- the invention also concerns a process for producing a casting starting from the coated sheet in which, after shaping, the coating of the casting is subjected to an increase in temperature at a speed in excess of 5° C./second, which may exceed 600° C./second.
- the invention also concerns the use of the hot-rolled steel sheet which then can be cold-rolled and coated, for structural and/or anti-intrusion or substructure castings for a land motor vehicle, such as, for example, a bumper bar, a door reinforcement, a wheel spoke.
- the sheet according to the invention which derives, by reason of its processing, from a hot-rolling mill, possibly may be cold-rerolled again depending on the final thickness desired. It then is coated with an aluminum-based coating, for example by dipping in a bath containing, in addition, from 8% to 11% silicon, from 2% to 4% iron, the sheet having a high mechanical resistance after thermal treatment and a high resistance to corrosion, as well as a good capacity for painting and gluing.
- the coating has in particular the function of protecting the basic sheet against hot as well as cold corrosion.
- the mechanical characteristics in the delivery state of the sheet according to the invention allow a great variety of shaping, in particular a deep stamping.
- the thermal treatment applied at the time of a hot-shaping process or alter shaping makes it possible to obtain high mechanical characteristics which may exceed 1500 MPa for mechanical resistance and 1200 MPa for the limit of elasticity.
- the final mechanical characteristics are adjustable and depend on the carbon content of the steel and on the thermal treatment.
- the coating forms a layer having a substantial resistance to abrasion, wear, fatigue, shock, as well as a good resistance to corrosion and a good capacity for painting and gluing.
- the steel the weight composition of which is the following:
- the coating layer comprises a first alloy layer in contact with the surface of the steel. This layer, directly in contact with the surface of the sheet, is highly alloyed with iron.
- a second coating layer, on top of the first, contains approximately 90% aluminum and may contain silicon and a small amount of iron, depending on the composition of the bath.
- the first alloy layer may crack when the sheet is shaped for the manufacture of castings.
- the coating is subjected to an increase in temperature at a speed in excess of 5° C./second, which may exceed 600° C./second. This rise in temperature makes possible a rapid remelting of the aluminum which fills in the cracks generated by the operation of shaping of the casting.
- Another advantage of the invention lies in the fact that the diffusion of the iron in the coating will be initiated at high temperature. One thus will have a better cohesion between coating and steel in the sheet.
- the thermal treatment may be performed locally, in heavily deformed zones.
- the steel sheet according to the invention containing 0.21% carbon, 1.14% manganese, 0.020% phosphorus, 0.0038% sulfur, 0.25% silicon, 0.040% aluminum, 0.009% copper, 0.020% nickel, 0.18% chromium, 0.0040% nitrogen, 0.032% titanium, 0.003% boron, 0.0050% calcium is coated with an aluminum-based layer about 20 ⁇ m in thickness.
- the sheet in the delivery state in a coil or in sheeting, the thickness of which may range between 0.25 mm and 15 mm, has good shaping properties and a good resistance to corrosion as well as a good capacity for painting or gluing.
- the sheet, a coated siderurgic product has a substantial resistance to corrosion in the delivery state, during shaping and thermal treatments as well as during usage of the finished casting. After thermal treatment, a substantial mechanical resistance, which may exceed 1500 MPa, is obtained.
- the presence of the coating at the time of thermal treatment of the castings makes it possible to prevent any decarbonization of the base metal as well as any oxidation. That is an undeniable advantage, in particular in the case of hot-shaping. Furthermore, heating of the treated casting does not require a furnace having a controlled atmosphere to prevent a decarbonization.
- Thermal treatment of the metal in the sheet consists in a heating at a temperature ranging between Ac1, starting temperature of austenitic transformation, for example 750° C. and 1200° C., in a furnace, for a period which depends on the temperature to be reached and the thickness of the casting sheet.
- the composition is optimized so as to limit the enlargement of the grains at the time of thermal treatment. If the structure sought is completely martensitic, the holding temperature should be in excess of Ac3, for example 840° C., ending temperature of austenitic formation. The temperature holding should be followed by a cooling adjusted to the final structure sought.
- the speed of cooling should be in excess of the critical speed of hardening which is 27° C./s for an austenitizing at 900° C. for 5 min., the sheet having a thickness of approximately 1 mm.
- ferrito-bainitic or ferrito-martensitic structures by a heating at a temperature ranging between Ac1, for example 750° C. and Ac3, for example 840° C., followed by an appropriate cooling.
- a heating at a temperature ranging between Ac1, for example 750° C. and Ac3, for example 840° C., followed by an appropriate cooling.
- one or several of these phases is/are present in variable proportions.
- the structure is composed predominantly of martensite.
- Chromium, manganese, boron and carbon are added, in the composition of the steel according to the invention, for their effect on hardenability.
- carbon makes it possible to achieve high mechanical characteristics thanks to its effect on the hardness of the martensite.
- Aluminum is introduced into the composition in order to trap oxygen and to protect the effectiveness of the boron.
- Titanium the ratio of the content of which with respect to the nitrogen content should be in excess of 3.42, is introduced in order to prevent combining of the boron with the nitrogen, the nitrogen being combined with titanium.
- the alloying elements, Mn, Cr, B make possible a hardenability allowing hardening in the stampers or the use of mild hardening fluids limiting deformation of the castings at the time of thermal treatment.
- the composition according to the invention is optimized from the point of view of weldability.
- the steel in the sheet may undergo a treatment for globularization of sulfides performed with calcium, which has the effect of improving the fatigue resistance of the sheet.
- the steel is particularly suited to the production of structural and anti-intrusion castings.
- the proposed coating makes it possible to avoid different surface-preparation operations such as for steel sheets for thermal treatment not having any coating.
- the modulation of thermal treatment parameters makes it possible to achieve, with a given composition, different levels of hot and cold sheet resistance according to the thickness sought.
- the base coating of aluminum for example, is transformed into a layer alloyed with iron and comprising different phases depending on the thermal treatment and having a considerable hardness which may exceed 600 HV100 g.
- Table 2 presents an example of maximal resistance of the steel sheet according to the invention after thermal treatment.
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- 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)
- Coating With Molten Metal (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Laminated Bodies (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
-
- 0.15%<carbon<0.5%
- 0.5%<manganese<3%
- 0.1%<silicon<0.5%
- 0.01%<chromium<1%
- titanium<0.2%
- aluminum<0.1%
- phosphorus<0.1%
- sulfur<0.05%
- 0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, the shoot ensuring a very high mechanical resistance after thermal treatment and the aluminum-based coating ensuring a high resistance to corrosion.
Description
-
- 0.15%<carbon<0.5%
- 0.5%<manganese<3%
- 0.1% silicon<0.5%
- 0.01%<chromium<1%
- titanium<0.2%
- aluminum<0.1%
- phosphorus<0.01%
- sulfur<0.05%
- 0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, the sheet ensuring a very high mechanical resistance after thermal treatment and the aluminum-based coating ensuring a high resistance to corrosion.
-
- the composition by weight of the sheet preferably is the following:
- 0.20%<carbon<0.5%
- 0.8%<manganese<1.5%
- 0.1% silicon<0.35%
- 0.01%<chromium<1%
- titanium<0.1%
- aluminum<0.1%
- phosphorus<0.05%
- sulfur<0.03%
- 0.0005%<boron<0.01%, the remainder being iron and impurities inherent in processing.
- in the composition by weight of the sheet, the titanium content with respect to the nitrogen content is in excess of 3.42, the boron no longer being able to be combined with the nitrogen.
- the metal bath for the coating contains in its basic composition by weight, from 9% to 10% silicon, from 2% to 3.5% iron, the remainder being aluminum.
- the metal bath for the coating contains in its basic composition by weight, from 2% to 4% iron, the remainder being aluminum.
- the composition by weight of the sheet preferably is the following:
-
- the coating and the casting are heated to a temperature in excess of 750° C.
-
- 0.15%<carbon<0.5%
- 0.5%<manganese<3%
- 0.1%<silicon <0.5%
- 0.01%<chromium<1%
- titanium<0.2%
- aluminum<0.1%
- phosphorus<0.1%
- sulfur<0.05%
- 0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, is processed in the form of a hot-rolled and possibly cold-rolled sheet to obtain the desired thickness. The steel sheet then is coated by dipping, after pickling, in an aluminum bath containing either from 8% to 11% silicon and 2% to 4% iron, or from 2% to 4% iron, or even in an aluminum bath preferably containing from 9% to 10% silicon and 2% to 3.5% iron.
Thermal treatment | Rm (MPa) | ||
850° C./5 min. | 1695 | ||
990° C./5 min. | 1675 | ||
950° C./5 min. | 1665 | ||
Claims (29)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/863,100 USRE44940E1 (en) | 1998-07-09 | 2013-04-15 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9808793A FR2780984B1 (en) | 1998-07-09 | 1998-07-09 | COATED HOT AND COLD STEEL SHEET HAVING VERY HIGH RESISTANCE AFTER HEAT TREATMENT |
FR9808793 | 1998-07-19 | ||
US09/350,100 US6296805B1 (en) | 1998-07-09 | 1999-07-09 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
US13/205,126 USRE44153E1 (en) | 1998-07-09 | 2011-08-08 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
US13/863,100 USRE44940E1 (en) | 1998-07-09 | 2013-04-15 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/350,100 Reissue US6296805B1 (en) | 1998-07-09 | 1999-07-09 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE44940E1 true USRE44940E1 (en) | 2014-06-10 |
Family
ID=9528455
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/350,100 Expired - Lifetime US6296805B1 (en) | 1998-07-09 | 1999-07-09 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
US13/205,126 Expired - Lifetime USRE44153E1 (en) | 1998-07-09 | 2011-08-08 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
US13/863,100 Expired - Lifetime USRE44940E1 (en) | 1998-07-09 | 2013-04-15 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/350,100 Expired - Lifetime US6296805B1 (en) | 1998-07-09 | 1999-07-09 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
US13/205,126 Expired - Lifetime USRE44153E1 (en) | 1998-07-09 | 2011-08-08 | Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment |
Country Status (11)
Country | Link |
---|---|
US (3) | US6296805B1 (en) |
EP (1) | EP0971044B1 (en) |
JP (1) | JP3931251B2 (en) |
AT (1) | ATE240419T1 (en) |
BR (1) | BR9902712A (en) |
CA (1) | CA2276911C (en) |
DE (1) | DE69907816T2 (en) |
DK (1) | DK0971044T3 (en) |
ES (1) | ES2196740T3 (en) |
FR (1) | FR2780984B1 (en) |
PT (1) | PT971044E (en) |
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Also Published As
Publication number | Publication date |
---|---|
PT971044E (en) | 2003-08-29 |
DE69907816T2 (en) | 2004-03-11 |
CA2276911C (en) | 2009-05-05 |
JP3931251B2 (en) | 2007-06-13 |
EP0971044B1 (en) | 2003-05-14 |
US6296805B1 (en) | 2001-10-02 |
DK0971044T3 (en) | 2003-08-11 |
ES2196740T3 (en) | 2003-12-16 |
EP0971044A1 (en) | 2000-01-12 |
ATE240419T1 (en) | 2003-05-15 |
BR9902712A (en) | 2000-03-08 |
USRE44153E1 (en) | 2013-04-16 |
FR2780984B1 (en) | 2001-06-22 |
JP2000038640A (en) | 2000-02-08 |
CA2276911A1 (en) | 2000-01-09 |
DE69907816D1 (en) | 2003-06-18 |
FR2780984A1 (en) | 2000-01-14 |
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