EP1662012B1 - Strip of hot rolled micro-alloyed steel for obtaining finished pieces by cold pressing and shearing - Google Patents
Strip of hot rolled micro-alloyed steel for obtaining finished pieces by cold pressing and shearing Download PDFInfo
- Publication number
- EP1662012B1 EP1662012B1 EP04425879A EP04425879A EP1662012B1 EP 1662012 B1 EP1662012 B1 EP 1662012B1 EP 04425879 A EP04425879 A EP 04425879A EP 04425879 A EP04425879 A EP 04425879A EP 1662012 B1 EP1662012 B1 EP 1662012B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- micro
- strip
- steel strip
- hot rolled
- ratio
- 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.)
- Revoked
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Definitions
- the present invention relates to a low carbon micro-alloyed steel strip that shows such features that it can replace, in producing finished pieces being stamped or cut, the cold rolled strips till now used to obtain structures of reduced weight and good mechanical strength.
- Said micro-alloyed or HSLA "High Strength Low Alloy" steels owe their name to the fact of including an addition of small quantities of niobium, vanadium, titanium and boron which hardly exceed the total quantity of 0.2%.
- These elements instead of entering as alloying agents in the iron crystal lattice, carry out their action being combined with carbon and nitrogen in the matrix, thus forming finely dispersed carbides, nitrides and carbonitrides. These compounds contribute to the grain refining and cause the matrix hardening with their precipitation in the ferritic grains.
- Object of the present invention is that of providing a strip of hot rolled, micro-alloyed low carbon steel with thickness ⁇ 0.7 mm which, particularly upon pickling and skinpassing, shows substantially the same metallurgical and geometrical features, as well as relating to planarity and deformability, of a cold rolled strip for producing stamped or sheared finished pieces, such as to be used as a valid substitute thereof.
- the strip according to the present invention is preferably, although not exclusively, manufactured with in-line plants of the thin-slab type, as disclosed e.g. in WO2004/026497 in the name of the present applicant, which is schematically represented in Fig. 1 and is characterized, as set forth in claim 1, by a grain fineness better than grade 10 of ASTM E 112 standard in a percentage > 90% of the whole structure, with a ratio between yield strength and breaking strength ⁇ 70%.
- the strip of micro-alloyed steel according to the present invention is preferably, although not exclusively, produced in thin-slab plants as schematically represented in Fig. 1 , where references is made in particular to the plant being the object of the international publication WO2004/026497 .
- the following operating steps can be observed, downstream of the casting step: a) liquid core reduction; b) roughing step directly adjoining the continuous casting; c) heating in an induction furnace; e) finishing rolling; f) compact controlled cooling; g) coiling on a reel.
- Such a plant is able to keep the temperature of the pre-strip (d) above 900°C in the steps preceding the final rolling.
- the pre-strip rolling above preceding 900°C allows to keep solute in the ⁇ iron (austenitic phase) most of the micro-alloying agents by completely exploiting their function of limiting the growth of the austenitic grain and enhancing the hardening by precipitation in ferritic phase during the cooling step after the final rolling.
- micro-alloyed steel strip according to the present invention shows a ratio between yield and tensile strength load equal or higher than 70%, as well as a good capability of being formed and cut under cold conditions.
- the ratio between the fatigue limit due to plain flexure ( ⁇ FP ) and the yield strength ⁇ FP /R p0,2 is near to 1 and equal to 0.96, thereby constantly higher than that relating to the reference hot rolled material, comprised between 0.88 and 0.90, practically corresponding to the value of the same ratio as detected for cold rolled strips of the same grade.
- the particular fine microstructure of these strips cause the same to be suitable for being finally cut and forming holes therein by punching, as well as the cold forming of complex shapes, in particular folds at 180° with bending radius equal to the thickness, for high strength steels having minimum warranted yield strength comprised between 275 and 700N/mm 2 .
- the cold forming of pieces having a complex shape is made easier also by the constant profile of the strip and its parallelism with deviation of less than 0.05 mm.
- the various steel grades have a chemical analysis comprised within the limits listed in the following Table 1: Element Content (%) C 0.04-0.08 Mn 0.15-2.0 Si 0.06-0.60 P 0.010 max S 0.010 max Cr 0.35 max Ni 0.20 max Mo 0.25 max Cu 0.20 max Nb 0.012-0.070 V 0.02-0.03 Ti ⁇ 0.11 Al 0.025-0.050 N 0.0115 max
- the total sum of micro-alloying elements (V, Ti and Nb) does not exceed 0.2%.
Abstract
Description
- The present invention relates to a low carbon micro-alloyed steel strip that shows such features that it can replace, in producing finished pieces being stamped or cut, the cold rolled strips till now used to obtain structures of reduced weight and good mechanical strength.
- From
JP2003253381 WO03/087414 US 6.488.790 ,US 6 264 760 B are for example known methods for producing hot rolled micro-alloyed strips. - Said micro-alloyed or HSLA "High Strength Low Alloy" steels owe their name to the fact of including an addition of small quantities of niobium, vanadium, titanium and boron which hardly exceed the total quantity of 0.2%. These elements, instead of entering as alloying agents in the iron crystal lattice, carry out their action being combined with carbon and nitrogen in the matrix, thus forming finely dispersed carbides, nitrides and carbonitrides. These compounds contribute to the grain refining and cause the matrix hardening with their precipitation in the ferritic grains.
- It is also known that these steels are particularly used in those applications where it is required to reduce the weight of a structure to be obtained without negatively affecting its mechanical strength. Their peculiar characteristic is that of showing a value of yield strength which nearers the tensile one, with a ratio between the two values that is higher than 70%. Consequently it is possible to obtain these results by reducing the stress resisting cross-section, while on the contrary, due to the proximity of the yield and tensile strengths, the material is provided with high elasticity features, being subject to a strong elastic recovery causing the finished piece to assume, upon pressing, undesired configurations. Therefore the use is restricted to those cases which do not require too strict tolerances of the finished pieces.
- Object of the present invention is that of providing a strip of hot rolled, micro-alloyed low carbon steel with thickness ≥ 0.7 mm which, particularly upon pickling and skinpassing, shows substantially the same metallurgical and geometrical features, as well as relating to planarity and deformability, of a cold rolled strip for producing stamped or sheared finished pieces, such as to be used as a valid substitute thereof.
- The strip according to the present invention is preferably, although not exclusively, manufactured with in-line plants of the thin-slab type, as disclosed e.g. in
WO2004/026497 in the name of the present applicant, which is schematically represented inFig. 1 and is characterized, as set forth inclaim 1, by a grain fineness better thangrade 10 of ASTM E 112 standard in a percentage > 90% of the whole structure, with a ratio between yield strength and breaking strength ≥ 70%. - Objects, advantages and features of the micro-alloys steel strip according to the present invention will appear more clearly from the following description with reference to the annexed drawings wherein:
-
Figure 1 schematically shows a thin slab casting and in-line rolling plant, particularly suitable to the production of micro-alloyed steel strips according to the invention; -
Figure 2 shows a diagram of the graphs, plotted by points, of the frequency with which the presence of certain dimensions of the ferritic grain is statistically detected in a number of strip coils at the beginning, at the middle and the end, respectively, of each strip coil according to the invention; -
Figure 3 shows a diagram representing the trend of strain limit of a steel according to the invention with warranted minimum yield strength of 355 N/mm2. - As stated above, the strip of micro-alloyed steel according to the present invention is preferably, although not exclusively, produced in thin-slab plants as schematically represented in
Fig. 1 , where references is made in particular to the plant being the object of the international publicationWO2004/026497 . The following operating steps can be observed, downstream of the casting step: a) liquid core reduction; b) roughing step directly adjoining the continuous casting; c) heating in an induction furnace; e) finishing rolling; f) compact controlled cooling; g) coiling on a reel. Such a plant is able to keep the temperature of the pre-strip (d) above 900°C in the steps preceding the final rolling. The pre-strip rolling above preceding 900°C allows to keep solute in the Υ iron (austenitic phase) most of the micro-alloying agents by completely exploiting their function of limiting the growth of the austenitic grain and enhancing the hardening by precipitation in ferritic phase during the cooling step after the final rolling. - It should be noted that these aspects are commonly disregarded in the traditional processes where the slab coming from continuous casting is cooled and subsequently heated for the final rolling. Therefore the action of the micro-alloying agents results strongly reduced because, while cooling, these precipitate roughly and without control, thus reducing the desired effect of a fine and diffused precipitation. This condition cannot be restored even through a subsequent heating of the slabs, unless high solubilization temperatures (beyond 1200°C) are reached, which however lead to other negative consequences such as the grain growing and the surface decarburization of the strip with consequent worsening of their qualities. Consequently the production of HSLA, especially of thickness < 2mm, with the traditional system can only be performed through more complex and cumbersome processing cycles because, after the hot rolling, the strips have to be cold rolled and treated in an annealing line provided with a controlled cooling.
- The micro-alloyed steel strip according to the present invention shows a ratio between yield and tensile strength load equal or higher than 70%, as well as a good capability of being formed and cut under cold conditions. These features are due to the favourable microstructural status rendering this product able to allow a valid alternative to the cold rolled micro-alloyed steel strips of equal thickness, with the additional advantage of being obtained with less addition of micro-alloying and alloying elements such as niobium, vanadium, titanium, manganese and chromium, as shown in Table 1.
- Experimental tests have shown that the strips of the present invention are characterized by a fine grain structure better than
grade 10 of the ASTM E 112 standard at a percentage higher than 90% in the whole structure, as it results from the graph offigure 2 , clearly showing that the most grains, above all in the head region of the strip, has dimensions corresponding or lower (thereby a better fineness) thangrade 10 of ASTM E 112 standard. These features of grain fineness and uniformity make this type of hot rolled strip particularly resistant to the fatigue tests. As it can be seen infigure 3 , representing the experimental tests carried out in strips according to the invention, the fatigue resistance is higher than that of products obtained with conventional processes and comparable with that of cold rolled strips of the same grade. It will be noted that this occurs both in the range of the "fatigue strength", namely for the limit values of load at which the breaking of the piece is experienced upon subjecting the same to a number N of cycle lower than 107, and in the range of the "fatigue limit", namely the limit strength determined by experimental tests, under which a piece does not break even if it is subjected to a number of strain cycles higher than the number conventionally, adopted for the steel, i.e. N=107. In particular, the fatigue limit detected for the S355MC steel at N=107 cycles (corresponding to 357 N/mm2) was found better, with a margin of 5-10%, in correspondence with no-breaking probability of 50%. Furthermore, the ratio between the fatigue limit due to plain flexure (σFP) and the yield strength σFP/Rp0,2 is near to 1 and equal to 0.96, thereby constantly higher than that relating to the reference hot rolled material, comprised between 0.88 and 0.90, practically corresponding to the value of the same ratio as detected for cold rolled strips of the same grade. - The particular fine microstructure of these strips cause the same to be suitable for being finally cut and forming holes therein by punching, as well as the cold forming of complex shapes, in particular folds at 180° with bending radius equal to the thickness, for high strength steels having minimum warranted yield strength comprised between 275 and 700N/mm2. The cold forming of pieces having a complex shape is made easier also by the constant profile of the strip and its parallelism with deviation of less than 0.05 mm.
- The various steel grades have a chemical analysis comprised within the limits listed in the following Table 1:
Element Content (%) C 0.04-0.08 Mn 0.15-2.0 Si 0.06-0.60 P 0.010 max S 0.010 max Cr 0.35 max Ni 0.20 max Mo 0.25 max Cu 0.20 max Nb 0.012-0.070 V 0.02-0.03 Ti ≤0.11 Al 0.025-0.050 N 0.0115 max - As it can be deduced from the table above, the total sum of micro-alloying elements (V, Ti and Nb) does not exceed 0.2%.
Claims (4)
- A hot rolled, micro-alloyed low carbon steel strip, with a thickness ≥ 0.7 mm and a fine grain microstructure, the pre-strip of which, upstream of the finishing rolling, is kept at a temperature ≥ 900°C, with a yield strength between 275 and 700 N/mm2, characterized by having the following chemical composition: C 0.04-0.08%, Mn 0.15-2.0%, Si 0.06-0.60%, P ≤0.010%, S ≤0.010%, Cr ≤ 0.35%, Ni ≤0.20%, Mo ≤0.25%, Cu ≤0.20%, Nb 0.012-0.070%, V 0.02-0.03%, Ti ≤ 0.11%, Al ≤0.025-0.050%, N ≤0.0115%, the balance being Fe and unavoidable impurities, with at least the 90% of its grains having a fineness better than grade 10 of ASTM E 112 standard, the ratio between fatigue limit and yield strength σFP/Rp0.2 being ≥ 90%, with the ratio between yield strength and tensile strength being ≥ 70%.
- A hot rolled, micro-alloyed steel strip according to claim 1, characterized in that the thickness tolerances are ≤ 0.05 mm.
- A steel strip according to claim 1, characterized by the fact of comprising no additions of boron as micro-alloying element.
- A steel strip according to claim 3, characterized in that the total sum of the micro-alloying elements, such as V, Ti and Nb, does not exceed 0.2%.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES04425879T ES2343460T3 (en) | 2004-11-24 | 2004-11-24 | HOT ROLLED MICROALEATED STEEL STRIP FOR THE OBTAINING OF FINISHED PARTS BY COLD PRESSING AND SHEARING. |
DE602004027147T DE602004027147D1 (en) | 2004-11-24 | 2004-11-24 | Strip of hot rolled micro-alloyed steel for getting the finished pieces through the pressing and shearing cold |
AT04425879T ATE467691T1 (en) | 2004-11-24 | 2004-11-24 | STRIPS OF HOT ROLLED MICRO-ALLOYED STEEL FOR MAINTAINING FINISHED PIECES BY COLD ACTUATING AND SHEARING |
EP04425879A EP1662012B1 (en) | 2004-11-24 | 2004-11-24 | Strip of hot rolled micro-alloyed steel for obtaining finished pieces by cold pressing and shearing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04425879A EP1662012B1 (en) | 2004-11-24 | 2004-11-24 | Strip of hot rolled micro-alloyed steel for obtaining finished pieces by cold pressing and shearing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1662012A1 EP1662012A1 (en) | 2006-05-31 |
EP1662012B1 true EP1662012B1 (en) | 2010-05-12 |
Family
ID=34932908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04425879A Revoked EP1662012B1 (en) | 2004-11-24 | 2004-11-24 | Strip of hot rolled micro-alloyed steel for obtaining finished pieces by cold pressing and shearing |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1662012B1 (en) |
AT (1) | ATE467691T1 (en) |
DE (1) | DE602004027147D1 (en) |
ES (1) | ES2343460T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3943210A1 (en) | 2020-07-23 | 2022-01-26 | Primetals Technologies Austria GmbH | Casting rolling composite system for the production of a hot rolled strip from a steel melt |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0621258B1 (en) | 2006-01-26 | 2014-10-07 | Giovanni Arvedi | STEEL STRIP WITH LOW CARBON CONNECTION IN HOT Laminated MICROLIGA |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3562028A (en) * | 1968-08-28 | 1971-02-09 | Inland Steel Co | Tough,high strength steel article |
US6488790B1 (en) * | 2001-01-22 | 2002-12-03 | International Steel Group Inc. | Method of making a high-strength low-alloy hot rolled steel |
JP2003253381A (en) * | 2002-03-01 | 2003-09-10 | Mitsubishi Heavy Ind Ltd | High-strength low-alloy steel |
CN1643167A (en) * | 2002-03-29 | 2005-07-20 | 新日本制铁株式会社 | High tensile steel excellent in high temperature strength and method for production thereof |
ITMI20021996A1 (en) * | 2002-09-19 | 2004-03-20 | Giovanni Arvedi | PROCESS AND PRODUCTION LINE FOR THE MANUFACTURE OF ULTRA-THIN HOT TAPE BASED ON THE TECHNOLOGY OF THE THIN SHEET |
-
2004
- 2004-11-24 ES ES04425879T patent/ES2343460T3/en active Active
- 2004-11-24 EP EP04425879A patent/EP1662012B1/en not_active Revoked
- 2004-11-24 DE DE602004027147T patent/DE602004027147D1/en active Active
- 2004-11-24 AT AT04425879T patent/ATE467691T1/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3943210A1 (en) | 2020-07-23 | 2022-01-26 | Primetals Technologies Austria GmbH | Casting rolling composite system for the production of a hot rolled strip from a steel melt |
WO2022017690A1 (en) | 2020-07-23 | 2022-01-27 | Primetals Technologies Austria GmbH | Casting-rolling integrated plant for producing a hot-rolled finished strip from a steel melt |
Also Published As
Publication number | Publication date |
---|---|
ATE467691T1 (en) | 2010-05-15 |
EP1662012A1 (en) | 2006-05-31 |
ES2343460T3 (en) | 2010-08-02 |
DE602004027147D1 (en) | 2010-06-24 |
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