WO2007132436A3 - Process for the production of fine-grained carbon steel strips and strips thus obtainable - Google Patents

Process for the production of fine-grained carbon steel strips and strips thus obtainable Download PDF

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Publication number
WO2007132436A3
WO2007132436A3 PCT/IB2007/051889 IB2007051889W WO2007132436A3 WO 2007132436 A3 WO2007132436 A3 WO 2007132436A3 IB 2007051889 W IB2007051889 W IB 2007051889W WO 2007132436 A3 WO2007132436 A3 WO 2007132436A3
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
strip
ranging
strips
rolling
Prior art date
Application number
PCT/IB2007/051889
Other languages
French (fr)
Other versions
WO2007132436A2 (en
Inventor
Ettore Anelli
Ilaria Salvatori
Original Assignee
Ct Sviluppo Materiali Spa
Ettore Anelli
Ilaria Salvatori
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ct Sviluppo Materiali Spa, Ettore Anelli, Ilaria Salvatori filed Critical Ct Sviluppo Materiali Spa
Publication of WO2007132436A2 publication Critical patent/WO2007132436A2/en
Publication of WO2007132436A3 publication Critical patent/WO2007132436A3/en

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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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • 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
    • C21D8/0431—Warm 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
    • 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
    • C21D8/0447—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 heat treatment
    • C21D8/0463—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 heat treatment following 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
    • C21D9/46—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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Abstract

The present invention relates to a process for the production of Carbon steel strips with a mainly fine grained ferrite microstructure, comprising the following steps : • transferring a strip, optionally coiled in the form of a coil, having a thickness ranging from 1.5 to 15 mm, of steel having a composition (expressed in mass percent) comprising: C 0.001-0.20; Mn 0.05-1.9; Si 0.002- 0.35; Al<0.06; S<0.03; P<0.1; N 0.003-0.02, the remaining part being, unavoidable impurities apart, substantially Fe, to a first reel placed near the ingoing side of a reversible rolling mill, having at least one stand and equipped at the outgoing side thereof with a second reel; • adjusting the temperature of the (optionally rapidly heated and oiled) strip, optionally under inert or non-oxidizing atmosphere, so that the start of the rolling occurs in ferritic field, preferably at a temperature higher than 550 °C and lower than (Ar1 - 20) °C; • controlled rolling in ferritic phase at a temperature adjusted in a range of ± 300C, by suitable heating, cooling and/or holding treatments, so as to accumulate an overall deformation εtot ranging from 0.7 to 1.6 in a temperature interval ranging from 550 °C to (Ar1 - 2O) °C; • in-line treating of the strip, optionally under inert or non-oxidizing atmosphere, upon reaching the desired end thickness, ranging from 0.3 to 7.0 mm, according to one of the following modes: - coiling at a temperature equal to or lower - at most of 40 °C - than the end-of-rolling one, followed by slow cooling of the coil - heating to a temperature <Ac1, and subsequent coiling thereat. - heating the strip up to a temperature in which ferrite and austenite phases coexist, followed by cooling the strip down to coiling temperatures lower than that of the start of martensite formation (Ms). Subject of the present invention are also the strips and the sheets of a thickness ranging from 0.3 to 7 mm, obtainable via said process.
PCT/IB2007/051889 2006-05-17 2007-05-17 Process for the production of fine-grained carbon steel strips and strips thus obtainable WO2007132436A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20060262 ITRM20060262A1 (en) 2006-05-17 2006-05-17 PROCEDURE FOR THE PRODUCTION OF FINE CARBON STEEL RIBBONS AND RIBBONS AS SUCH POSSIBLE
ITRM2006A000262 2006-05-17

Publications (2)

Publication Number Publication Date
WO2007132436A2 WO2007132436A2 (en) 2007-11-22
WO2007132436A3 true WO2007132436A3 (en) 2009-05-07

Family

ID=38610654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/051889 WO2007132436A2 (en) 2006-05-17 2007-05-17 Process for the production of fine-grained carbon steel strips and strips thus obtainable

Country Status (2)

Country Link
IT (1) ITRM20060262A1 (en)
WO (1) WO2007132436A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009072303A1 (en) 2007-12-05 2009-06-11 Honda Motor Co., Ltd. High-strength steel sheet, automotive strengthening member comprising the same, and process for producing automotive strengthening member
AT509707B1 (en) * 2010-05-04 2011-11-15 Siemens Vai Metals Tech Gmbh METHOD FOR HOT ROLLING OF STEEL STRIPS AND HOT ROLLING STRIP
US11885025B2 (en) * 2018-12-11 2024-01-30 Nippon Steel Corporation High-strength steel sheet having excellent moldability and impact resistance, and method for manufacturing high-strength steel sheet having excellent moldability and impact resistance

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4466842A (en) * 1982-04-03 1984-08-21 Nippon Steel Corporation Ferritic steel having ultra-fine grains and a method for producing the same
JPS59166651A (en) * 1983-03-10 1984-09-20 Nippon Steel Corp Two-phase high tensile hot rolled steel plate comprising two-phase structure of ultra-fine grain ferrite phase and hardening phase and preparation tehereof
EP0524162A2 (en) * 1991-07-17 1993-01-20 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method of manufacturing a thin sheet of low carbon steel
DE19600990A1 (en) * 1996-01-14 1997-07-17 Thyssen Stahl Ag Process for hot rolling steel strips
JPH10168542A (en) * 1996-12-12 1998-06-23 Nippon Steel Corp High strength steel excellent in low temperature toughness and fatigue strength and its production
EP0903413A1 (en) * 1997-09-22 1999-03-24 National Research Institute For Metals Fine-grained ferrite-based structural steel and manufacturing process of this steel
JP2000158006A (en) * 1998-11-26 2000-06-13 Ishikawajima Harima Heavy Ind Co Ltd Equipment for refining ferrite grain

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4466842A (en) * 1982-04-03 1984-08-21 Nippon Steel Corporation Ferritic steel having ultra-fine grains and a method for producing the same
JPS59166651A (en) * 1983-03-10 1984-09-20 Nippon Steel Corp Two-phase high tensile hot rolled steel plate comprising two-phase structure of ultra-fine grain ferrite phase and hardening phase and preparation tehereof
EP0524162A2 (en) * 1991-07-17 1993-01-20 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method of manufacturing a thin sheet of low carbon steel
DE19600990A1 (en) * 1996-01-14 1997-07-17 Thyssen Stahl Ag Process for hot rolling steel strips
JPH10168542A (en) * 1996-12-12 1998-06-23 Nippon Steel Corp High strength steel excellent in low temperature toughness and fatigue strength and its production
EP0903413A1 (en) * 1997-09-22 1999-03-24 National Research Institute For Metals Fine-grained ferrite-based structural steel and manufacturing process of this steel
JP2000158006A (en) * 1998-11-26 2000-06-13 Ishikawajima Harima Heavy Ind Co Ltd Equipment for refining ferrite grain

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE INSPEC [online] THE INSTITUTION OF ELECTRICAL ENGINEERS, STEVENAGE, GB; 2006, SALVATORI I: "Ultrafine grained steels by advanced thermomechanical processes and severe plastic deformations", XP002457200, Database accession no. 9183206 *
METALLURGIA ITALIANA ASSOC. ITALIANA DI METALLURGIA ITALY, no. 5, 4 November 2005 (2005-11-04), pages 41 - 47, ISSN: 0026-0843 *

Also Published As

Publication number Publication date
WO2007132436A2 (en) 2007-11-22
ITRM20060262A1 (en) 2007-11-18

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