EP1485511A2 - High-resistant, low-density hot laminated sheet steel and method for the production thereof - Google Patents
High-resistant, low-density hot laminated sheet steel and method for the production thereofInfo
- Publication number
- EP1485511A2 EP1485511A2 EP03725278A EP03725278A EP1485511A2 EP 1485511 A2 EP1485511 A2 EP 1485511A2 EP 03725278 A EP03725278 A EP 03725278A EP 03725278 A EP03725278 A EP 03725278A EP 1485511 A2 EP1485511 A2 EP 1485511A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- phase
- silicon
- sheet according
- aluminum
- sheet
- 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
-
- 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
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
Definitions
- the invention relates to a hot-rolled steel sheet, with very high strength and low density, from a strip rolling train, as well as its manufacturing process.
- Reducing motor vehicles becomes a necessity due to the imposition of reducing C02 emissions to 140g / Km in 2008. This reduction can only be achieved by increasing the level of mechanical strength of steels to compensate for the decrease in sheet thickness. It is therefore necessary to increase the mechanical characteristics while reducing the thicknesses of the sheets with which the parts used are made. This approach finds its limits with the reduction in the rigidity of the parts and the appearance of unacceptable vibrations and noises in targeted applications in the automotive field where noise is an element of discomfort.
- the object of the invention is to provide users of hot-rolled steel sheets with a sheet of low density and having resistance levels comparable to steel sheets with high mechanical resistance currently used or even of a higher level, and this, in order to combine the two advantages of low density and high mechanical strength.
- the first object of the invention is a hot-rolled steel sheet of very high strength and low density, characterized in that its composition in% by weight comprises: 0.04% ⁇ carbon ⁇ 0.5%
- the steel comprises in its composition, in% by weight:
- the sheet according to the invention is such that the silicon content is between 3 and 6%, and that the aluminum content is between 1 and 2%.
- the sheet according to the invention is such that the silicon content is between 2 and 3%, and that the aluminum content is between 7 and 10%.
- the silicon and aluminum contents of the sheet according to the invention are such that:
- the sheet according to the invention can also have the following characteristics, alone or in combination:
- the sheet has a microstructure consisting of a primary ferrite phase and a secondary ferrite phase, the average grain size of said primary ferrite being greater than the average grain size of said secondary ferrite, said microstructure also containing carburetted phases,
- the sheet has a primary ferrite phase obtained during the heating of the steel carried out prior to hot rolling, and a secondary ferrite phase obtained after hot rolling, as well as carburetted phases, - the sheet comprises a primary ferrite phase whose average grain size greater than 5 ⁇ m, and a secondary ferrite phase are the average grain size less than 2 ⁇ m.
- the second object of the invention is a method of manufacturing a hot-rolled sheet which comprises the steps consisting in:
- the temperature of end of hot rolling being higher than the temperature AR3 of the austenitic phase formed during reheating, in order to carry out a rolling under austenitic conditions, thus transforming the austenitic phase into a phase secondary ferrite and fuel phases.
- FIG. 1 a curve showing the evolution of the density of a steel as a function of the silicon, aluminum and / or silicon plus aluminum content
- FIG. 2 the microstructure of a steel according to the invention comprising 0.04% of carbon (casting I)
- FIG. 3 the microstructure of a steel according to the invention comprising 0.160% of carbon (casting J)
- FIG. 4 the microstructure of a steel according to the invention comprising 0.268% of carbon (casting K)
- FIG. 5 the microstructure of a steel comprising 0.505% of carbon, shown for comparison (casting L ).
- the hot rolled steel on a strip train according to the invention has a high mechanical strength and a low density.
- molybdenum ⁇ 2% taken alone or in combination, the rest being iron and elements inherent in the preparation, comprises:
- the carbon content of the sheet according to the invention is between 0.04 and 0.5% by weight, preferably between 0.04 and 0.3% by weight.
- the evolution of the structure of the steel as a function of the carbon content is presented in FIGS. 2 to 5 and shows that the structure of the steel according to the invention (FIGS. 2 to 4) consists of primary ferrite with coarse grains, and a mixture of carburetted phase and fine secondary ferrite with smaller grains. If the carbon content falls below 0.04%, the microstructure does not include carburetted phases and loses in mechanical characteristics. On the other hand, if the carbon content exceeds 0.5% in weight, the structure becomes very fragile, and we observe that the microstructure no longer includes primary ferrite (see Figure 5).
- the steel according to the invention can reach levels of mechanical resistance ranging from 620 MPa to more than 1000 MPa and densities of the order of 7.55 and down to 7 g / cm3 depending on the contents.
- silicon and aluminum and additive elements as shown in Figure 1.
- the mechanical characteristics can be reinforced by the addition of micro alloy elements such as niobium, titanium, vanadium, the latter two, which are less dense than iron.
- the sheet according to the invention can be manufactured by any suitable process.
- This process first of all comprises reheating the slab at high temperature (preferably above 900 ° C.), prior to hot rolling.
- high temperature preferably above 900 ° C.
- the present inventors have discovered that during this reheating step, the slab has a microstructure composed of a so-called primary ferritic phase which forms at high temperature, and which co-exists with an austenitic phase.
- the austenitic phase is then completely transformed into a mixture of carburetted phase and secondary ferrite, the average grain size of which is smaller than that of the primary ferritic phase which remains.
- a carbon-manganese couple will advantageously be chosen in order to have an AR3 transformation temperature such that it is possible to guarantee rolling under austenitic conditions.
- Table 1 below presenting different analyzes according to the invention, shows the influence of the different elements on the characteristics of the steels.
- the flows A, C, F, H and L are given for comparison, while the flows B, D, E, G, I, J and K are according to the invention.
- the rolling temperature is 895 ° C, and the winding temperature of 600 ° C, with a cooling rate of 49 ° C / s, which gives the steel a mechanical resistance of 750 MPa.
- Lowering the winding temperature increases the level of mechanical resistance.
- the winding temperature of which is 20 ° C. with a cooling rate of 5 ° C./s, which makes it possible to reach a level of mechanical resistance of 902 MPa.
- the level of mechanical strength can also be adjusted by carbon and manganese contents and / or other addition elements as presented above.
- Certain operations such as, for example, re-rolling or a heat treatment such as annealing, can be used to modify or adjust the level of mechanical properties.
- the steel proposed meets two contradictory needs in the field of hot-rolled steels on the one hand, high mechanical properties and on the other hand, low density.
- the existing solutions for making steels with very high levels of mechanical strength are based on the use of addition elements which do not allow a large variation in density, and the existing solutions for making steels with low density are based on the use of addition elements which do not allow a high level of mechanical strength to be achieved.
- the steel of the invention combines these two properties, namely, a high level of mechanical resistance and a very low density for lightening of a part usable in the automobile.
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)
- Pressure Welding/Diffusion-Bonding (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0202998 | 2002-03-11 | ||
FR0202998A FR2836930B1 (en) | 2002-03-11 | 2002-03-11 | HOT ROLLED STEEL WITH HIGH RESISTANCE AND LOW DENSITY |
PCT/FR2003/000765 WO2003076673A2 (en) | 2002-03-11 | 2003-03-10 | High-resistant, low-density hot laminated sheet steel and method for the production thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1485511A2 true EP1485511A2 (en) | 2004-12-15 |
EP1485511B1 EP1485511B1 (en) | 2005-12-07 |
Family
ID=27763686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03725278A Expired - Lifetime EP1485511B1 (en) | 2002-03-11 | 2003-03-10 | High-resistant, low-density hot laminated steel sheet and method for the production thereof |
Country Status (15)
Country | Link |
---|---|
US (1) | US7416615B2 (en) |
EP (1) | EP1485511B1 (en) |
JP (1) | JP4638152B2 (en) |
KR (1) | KR100986697B1 (en) |
CN (1) | CN1306046C (en) |
AT (1) | ATE312206T1 (en) |
AU (1) | AU2003227824A1 (en) |
BR (1) | BR0308328B1 (en) |
CA (1) | CA2478123C (en) |
DE (1) | DE60302659T2 (en) |
ES (1) | ES2252671T3 (en) |
FR (1) | FR2836930B1 (en) |
MX (1) | MXPA04008717A (en) |
RU (1) | RU2323983C2 (en) |
WO (1) | WO2003076673A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2543590C2 (en) * | 2010-10-18 | 2015-03-10 | Ниппон Стил Энд Сумитомо Метал Корпорейшн | Hot-rolled, cold-rolled and cladded steel plate having improved uniform and local ductility at high deformation rate |
Families Citing this family (20)
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JP5042694B2 (en) * | 2007-04-13 | 2012-10-03 | 新日本製鐵株式会社 | High strength low specific gravity steel plate excellent in ductility and workability and method for producing the same |
EP1995336A1 (en) * | 2007-05-16 | 2008-11-26 | ArcelorMittal France | Low-density steel with good suitability for stamping |
KR101008117B1 (en) | 2008-05-19 | 2011-01-13 | 주식회사 포스코 | High strength thin steel sheet for the superier press formability and surface quality and galvanized steel sheet and method for manufacturing the same |
KR101027250B1 (en) * | 2008-05-20 | 2011-04-06 | 주식회사 포스코 | High strength steel sheet and hot dip galvanized steel sheet having high ductility and excellent delayed fracture resistance and method for manufacturing the same |
KR100985298B1 (en) * | 2008-05-27 | 2010-10-04 | 주식회사 포스코 | Low Density Gravity and High Strength Hot Rolled Steel, Cold Rolled Steel and Galvanized Steel with Excellent Ridging Resistibility and Manufacturing Method Thereof |
TWI447236B (en) | 2011-03-28 | 2014-08-01 | Nippon Steel & Sumitomo Metal Corp | Hot rolled steel sheet and manufacturing method thereof |
KR101634776B1 (en) | 2011-05-25 | 2016-06-30 | 신닛테츠스미킨 카부시키카이샤 | Hot-rolled steel sheet and process for producing same |
WO2013178887A1 (en) | 2012-05-31 | 2013-12-05 | Arcelormittal Investigación Desarrollo Sl | Low-density hot- or cold-rolled steel, method for implementing same and use thereof |
DE102012013113A1 (en) * | 2012-06-22 | 2013-12-24 | Salzgitter Flachstahl Gmbh | High strength multiphase steel and method of making a strip of this steel having a minimum tensile strength of 580 MPa |
CN103215516B (en) | 2013-04-09 | 2015-08-26 | 宝山钢铁股份有限公司 | A kind of 700MPa grade high-strength hot-rolled Q & P steel and manufacture method thereof |
TWI519650B (en) * | 2013-05-01 | 2016-02-01 | 新日鐵住金股份有限公司 | Zn-coated steel sheet and method of manufacturing the same |
MX2015014879A (en) | 2013-05-01 | 2016-03-21 | Nippon Steel & Sumitomo Metal Corp | High-strength, low-specific gravity steel plate having excellent spot welding properties. |
UA117592C2 (en) * | 2013-08-01 | 2018-08-27 | Арселорміттал | PAINTED GALVANIZED STEEL SHEET AND METHOD OF MANUFACTURING |
KR102021687B1 (en) | 2015-04-08 | 2019-09-16 | 닛폰세이테츠 가부시키가이샤 | Hot Rolled Steel Sheets For Heat Treatment |
KR102034129B1 (en) | 2015-04-08 | 2019-10-18 | 닛폰세이테츠 가부시키가이샤 | Heat-treated steel sheet member and manufacturing method thereof |
CN107532255B (en) | 2015-04-08 | 2019-06-28 | 日本制铁株式会社 | Heat- treated steel board member and its manufacturing method |
RU2615667C1 (en) * | 2015-12-09 | 2017-04-06 | Публичное акционерное общество "Северсталь" | Method of producing hot-rolled sheets of low-alloyed steel of k65 strength grade for longitudinal electric-welded pipes |
RU2627079C1 (en) * | 2016-11-17 | 2017-08-03 | Федеральное Государственное Унитарное Предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" (ФГУП "ЦНИИчермет им. И.П. Бардина") | Method of manufacture of high-strengthen corrosive-resistant hot-rolled steel with low specific weight |
CN112481555B (en) * | 2020-11-27 | 2022-01-04 | 马鞍山市鑫龙特钢有限公司 | Low-density steel resistant to high-temperature oxidation corrosion |
WO2023105271A1 (en) * | 2021-12-10 | 2023-06-15 | Arcelormittal | Low density hot rolled steel, method of production thereof and use of such steel to produce vehicle parts |
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JPS60204833A (en) * | 1984-03-29 | 1985-10-16 | Sumitomo Metal Ind Ltd | Manufacture of "sendust(r)" plate having superior magnetic characteristic |
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JPH07252592A (en) * | 1994-03-15 | 1995-10-03 | Nippon Steel Corp | Hot rolled high strength steel sheet excellent in formability, low temperature toughness and fatigue property |
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JPH09241745A (en) * | 1996-03-01 | 1997-09-16 | Nkk Corp | Production of pc steel rod excellent in uniform elongation and high temperature relaxation characteristic |
JPH1025543A (en) * | 1996-07-15 | 1998-01-27 | Nkk Corp | Pc steel bar excellent in uniform elongation and high temperature relaxation characteristic in as-spot-welded state |
JPH10212522A (en) | 1997-01-30 | 1998-08-11 | Nippon Steel Corp | Manufacture of hot rolled steel sheet excellent in pickling property |
EP1025543A1 (en) | 1997-10-28 | 2000-08-09 | Hide and Seek Technologies, Inc. | Optical disc authentication and data storage |
JPH11189850A (en) * | 1997-12-24 | 1999-07-13 | Sumitomo Metal Ind Ltd | Non-oriented silicon steel sheet and its production |
JP3401427B2 (en) * | 1998-03-12 | 2003-04-28 | 株式会社神戸製鋼所 | High-strength steel sheet with excellent impact resistance |
JPH11323489A (en) | 1998-05-13 | 1999-11-26 | Nippon Steel Corp | High strength cold rolled steel sheet having superior workability and excellent in shape fixability and its production |
JP4184481B2 (en) * | 1998-06-11 | 2008-11-19 | 新日本製鐵株式会社 | Corrosion resistant steel |
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JP3447233B2 (en) * | 1998-12-11 | 2003-09-16 | 新日本製鐵株式会社 | Method for producing thin steel sheet and high-strength pressed body excellent in heat-hardening ability |
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-
2002
- 2002-03-11 FR FR0202998A patent/FR2836930B1/en not_active Expired - Lifetime
-
2003
- 2003-03-10 DE DE60302659T patent/DE60302659T2/en not_active Expired - Lifetime
- 2003-03-10 CN CNB038056259A patent/CN1306046C/en not_active Expired - Lifetime
- 2003-03-10 JP JP2003574870A patent/JP4638152B2/en not_active Expired - Lifetime
- 2003-03-10 AT AT03725278T patent/ATE312206T1/en not_active IP Right Cessation
- 2003-03-10 KR KR1020047014303A patent/KR100986697B1/en active IP Right Grant
- 2003-03-10 AU AU2003227824A patent/AU2003227824A1/en not_active Abandoned
- 2003-03-10 RU RU2004129774/02A patent/RU2323983C2/en active
- 2003-03-10 US US10/507,641 patent/US7416615B2/en not_active Expired - Lifetime
- 2003-03-10 CA CA2478123A patent/CA2478123C/en not_active Expired - Lifetime
- 2003-03-10 ES ES03725278T patent/ES2252671T3/en not_active Expired - Lifetime
- 2003-03-10 EP EP03725278A patent/EP1485511B1/en not_active Expired - Lifetime
- 2003-03-10 BR BRPI0308328-4A patent/BR0308328B1/en active IP Right Grant
- 2003-03-10 WO PCT/FR2003/000765 patent/WO2003076673A2/en active IP Right Grant
- 2003-03-10 MX MXPA04008717A patent/MXPA04008717A/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO03076673A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2543590C2 (en) * | 2010-10-18 | 2015-03-10 | Ниппон Стил Энд Сумитомо Метал Корпорейшн | Hot-rolled, cold-rolled and cladded steel plate having improved uniform and local ductility at high deformation rate |
Also Published As
Publication number | Publication date |
---|---|
WO2003076673A8 (en) | 2004-09-30 |
EP1485511B1 (en) | 2005-12-07 |
BR0308328B1 (en) | 2011-11-01 |
CA2478123A1 (en) | 2003-09-18 |
ES2252671T3 (en) | 2006-05-16 |
CN1306046C (en) | 2007-03-21 |
BR0308328A (en) | 2004-12-28 |
AU2003227824A8 (en) | 2003-09-22 |
FR2836930A1 (en) | 2003-09-12 |
JP4638152B2 (en) | 2011-02-23 |
MXPA04008717A (en) | 2004-12-06 |
DE60302659T2 (en) | 2006-07-20 |
AU2003227824A1 (en) | 2003-09-22 |
CN1688725A (en) | 2005-10-26 |
ATE312206T1 (en) | 2005-12-15 |
US7416615B2 (en) | 2008-08-26 |
US20060231177A1 (en) | 2006-10-19 |
FR2836930B1 (en) | 2005-02-25 |
KR100986697B1 (en) | 2010-10-08 |
KR20040088583A (en) | 2004-10-16 |
DE60302659D1 (en) | 2006-01-12 |
RU2004129774A (en) | 2005-08-20 |
RU2323983C2 (en) | 2008-05-10 |
WO2003076673A3 (en) | 2004-04-22 |
CA2478123C (en) | 2011-01-25 |
JP2005527701A (en) | 2005-09-15 |
WO2003076673A2 (en) | 2003-09-18 |
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