US20080000555A1 - High Strength Thin-Gauge Steel Sheet Excellent in Elongation and Hole Expandability and Method of Production of Same - Google Patents

High Strength Thin-Gauge Steel Sheet Excellent in Elongation and Hole Expandability and Method of Production of Same Download PDF

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US20080000555A1
US20080000555A1 US11/663,581 US66358105A US2008000555A1 US 20080000555 A1 US20080000555 A1 US 20080000555A1 US 66358105 A US66358105 A US 66358105A US 2008000555 A1 US2008000555 A1 US 2008000555A1
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steel sheet
cooling
high strength
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Toshiki Nonaka
Hirokazu Taniguchi
Koichi Goto
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Nippon Steel Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • 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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D8/041—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 involving a particular fabrication or treatment of ingot or slab
    • 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
    • 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
    • C21D8/0436—Cold 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
    • C21D8/0473—Final recrystallisation annealing
    • 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
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • 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
    • 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
    • C21D2211/001—Austenite
    • 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

Definitions

  • the present invention relates to high strength thin-gauge steel sheet excellent in elongation and hole expandability and a method of production thereof.
  • the working method is frequently shifting from the conventional drawing using wrinkle elimination to simple stamping and bending.
  • the bending ridge is an arc or other curve
  • stretch flanging where the end face of the steel sheet is elongated is sometimes used.
  • the amount of the expansion in the large case is up to 1.6 times the diameter of the preparatory hole.
  • the present invention has as its object to solve the problems of the prior art as explained above and realize high strength thin-gauge steel sheet with excellent elongation and hole expandability and a method of production for the same on an industrial scale. Specifically, it has as its object to realize high strength thin-gauge steel sheet exhibiting the above performance by a tensile strength of 500 MPa or more and a method of production of the same on an industrial scale.
  • the inventors studied the methods of production of high strength thin-gauge steel sheet with excellent elongation and hole expandability and as a result discovered that to further improve the ductility and hole expandability of steel sheet, in the case of high strength cold rolled steel sheet with a tensile strength of steel sheet of 500 MPa or more, the form and balance of the metal structure of the steel sheet and the use of tempered martensite are important.
  • High strength thin-gauge steel sheet with excellent elongation and hole expandability characterized by being comprised of, by mass %, C: 0.03 to 0.25%, Si: 0.4 to 2.0%, Mn: 0.8 to 3.1%, P ⁇ 0.02%, S ⁇ 0.02%, Al ⁇ 2.0%, N ⁇ 0.01%, and a balance of Fe and unavoidable impurities and having a microstructure comprised of ferrite with an area fraction of 10 to 85% and residual austenite with a volume fraction of 1 to 10%, an area fraction of 10% to 60% of tempered martensite, and a balance of bainite.
  • TS target value is design value of strength of steel sheet in units of MPa, [Al] is mass % of Al, and [Si] is mass % of Si,
  • a method of production of high strength thin-gauge steel sheet with excellent elongation and hole expandability characterized by producing a slab comprised of, by mass %, C: 0.03 to 0.25%, Si: 0.4 to 2.0%, Mn: 0.8 to 3.1%, P ⁇ 0.02%, S ⁇ 0.02%, Al ⁇ 2.0%, and N ⁇ 0.01% and, further, when necessary, one or more types of V: 0.005 to 1%, Ti: 0.002 to 1%, Nb: 0.002 to 1%, Cr: 0.005 to 2%, Mo: 0.005 to 1%, B: 0.0002 to 0.1%, Mg: 0.0005 to 0.01%, REM: 0.0005 to 0.01%, and Ca: 0.0005 to 0.01%, and a balance of Fe and unavoidable impurities, heating it in a range of 1150 to 1250° C., then hot rolling it in a temperature range of 800 to 950° C., coiling it at 700° C.
  • a metal structure having a microstructure comprised of ferrite with an area fraction of 10 to 85% and residual austenite with a volume fraction of 1 to 10%, an area fraction of 10% to 60% of tempered martensite, and a balance of bainite.
  • a method of production of high strength thin-gauge steel sheet with excellent elongation and hole expandability according to (4) characterized by, in the continuous annealing process, soaking at 600° C. to the Ac 3 point+50° C. for recrystallization annealing, cooling by an average cooling rate of 10 to 150° C./s to 400° C. or less, then heating and holding a first time at 150 to 400° C. for 1 to 20 minutes, then heating and holding a second time at a temperature 30 to 300° C. higher than the first heating and holding temperature to 500° C. for 1 to 100 seconds, then cooling.
  • a method of production of high strength thin-gauge steel sheet with excellent elongation and hole expandability according to (4) characterized by, in the continuous annealing process, soaking at 600° C. to the Ac 3 point+50° C. for recrystallization annealing, cooling by an average cooling rate of 10 to 150° C./s to 400° C. or less, then heating and holding a first time at 150 to 400° C. for 1 to 20 minutes, cooling to the martensitic transformation point or less, heating and holding a second time at the cooling end temperature to 500° C. for 1 to 100 seconds, then cooling.
  • the biggest characteristic of the structure of a high strength thin-gauge steel sheet according to the present invention is that by performing the necessary heat treatment after an annealing and quenching process, a metal structure containing ferrite, residual austenite, tempered martensite, and bainite in a good balance can be obtained and a material having extremely stable ductility and hole expandability can be obtained.
  • C is an important element for improving the strengthening and hardenability of the steel and is essential for obtaining a composite structure comprised of ferrite, martensite, bainite, etc.
  • a composite structure comprised of ferrite, martensite, bainite, etc.
  • 0.03% or more is necessary.
  • the content becomes greater, the cementite or other iron-based carbides easily become coarser, the local formability deteriorates, and the hardness after welding remarkably rises, so 0.25% was made the upper limit.
  • Si is an element preferable for raising the strength without lowering the workability of the steel.
  • 0.4% a pearlite structure harmful to the hole expandability is easily formed and, due to the drop in the solution strengthening of the ferrite, the hardness difference between the formed structures becomes greater and deterioration of the hole expandability is invited, so 0.4% was made the lower limit.
  • the cold rollability drops and the Si oxides formed at the steel sheet surface cause a drop in the chemical conversion ability. Further, the plating adhesion and weldability also drop, so 2.0% was made the upper limit.
  • Mn is an element which has to be added from the viewpoint of securing the strength and, further, delaying the formation of carbides and is an element effective for formation of ferrite. If less than 0.8%, the strength is not satisfactory. Further, formation of ferrite becomes insufficient and the ductility deteriorates. If over 3.1%, the martensite becomes excessive, a rise in strength is invited, and the workability deteriorates, so 3.1% was made the upper limit.
  • Al is an element required for deoxidization of steel, but if over 2.0% increases the alumina and other inclusions and impairs the workability, so 2.0% was made the upper limit. To improve the ductility, addition of 0.2% or more is preferable.
  • TS target value is the design value of the strength of the steel sheet in units of MPa
  • [Al] is the mass % of Al
  • [Si] is the mass % of Si
  • the amounts of Al and Si added are (0.0012 ⁇ [TS target value] ⁇ 0.29)/3 or less, they are insufficient for improving the ductility, while if 1.0 or more, the chemical conversion ability and plating adhesion deteriorate.
  • V for improving the strength, can be added in the range of 0.005 to 1%.
  • Ti is an element effective for the purpose of improving the strength and for forming Ti-based sulfides with relatively little effect on the local formability and reducing the harmful MnS. Further, it has the effect of suppressing coarsening of the welded metal structure and making embrittlement difficult. To exhibit these effects, less than 0.002% is insufficient, so 0.002% is made the lower limit. However, if excessively added, the coarse and angular TiN increases and reduces the local formability. Further, stable carbides are formed, the concentration of C in the austenite falls at the time of production of the matrix, the desired hardened structure cannot be obtained, and the tensile strength also can no longer be secured, so 1.0% was made the upper limit.
  • Nb is an element effective for the purpose of improving the strength and forming fine carbides suppressing softening of the weld heat affected zone. If less than 0.002%, the effect of suppressing softening of the weld heat affected zone cannot be sufficiently obtained, so 0.002% was made the lower limit. On the other hand, if excessively added, the increase in the carbides causes the workability of the matrix to decline, so 1.0% was made the upper limit.
  • Cr can be added as a strengthening element, but if less than 0.005, has no effect, while if over 2%, degrades the ductility and chemical conversion ability, so 0.005% to 2% was made the range.
  • Mo is an element which has an effect on securing the strength and on the hardenability and further makes a bainite structure easier to obtain. Further, it also has the effect of suppressing the softening of the weld heat affected zone. Copresence together with Nb etc. is believed to increase this effect. If less than 0.005%, this effect is insufficient, so 0.005% is made the lower limit. However, even if excessively added, the effect becomes saturated and becomes economically disadvantageous, so 1% was made the upper limit.
  • B is an element having the effect of improving the hardenability of the steel and interacting with C to suppress diffusion of C at the weld heat affected zone and thereby suppress softening. To exhibit this effect, addition of 0.0002% or more is necessary. On the other hand, if excessively added, the workability of the matrix drops and embrittlement of the steel or a drop in the hot workability is caused, so 0.1% was made the upper limit.
  • Mg bonds with oxygen to form oxides upon addition but the MgO and the complex compounds of Al 2 O 3 , SiO 2 , MnO, Ti 2 O 3 , etc. including MgO are believed to precipitate extremely finely. These oxides finely and uniformly dispersed in the steel, while not certain, are believed to have the effect of forming fine voids at the time of stamping or shearing at the stamped or sheared cross-section forming starting points of cracks and suppressing stress concentration at the time of later burring or stretch flanging so as to prevent growth of the cracks to large cracks.
  • REM are believed to be elements with a similar effect as Mg. While not sufficiently confirmed, they are believed to be elements promising an improvement in the hole expandability and stretch flangeability due to the effect of suppression of cracks by the formation of fine oxides, but if less than 0.0005%, this effect is insufficient, so 0.0005% was made the lower limit. On the other hand, with addition over 0.01%, not only does the amount of improvement with respect to the added amount become saturated, but also this conversely degrades the cleanliness factor of the steel and degrades the hole expandability and stretch flangeability, so 0.01% was made the upper limit.
  • Ca has the effect of improving the local formability of the matrix by control of the form of the sulfide-based inclusions (spheroidization), but if less than 0.0005%, the effect is insufficient, so 0.0005% was made the lower limit. Further, if excessively added, not only is the effect saturated, but also the reverse effect due to the increase in inclusions (deterioration of local formability) occurs, so the upper limit was made 0.01%.
  • the reason for making the structure of the steel sheet a composite structure of ferrite, residual austenite, tempered martensite, and bainite is to obtain steel shape excellent in strength and also elongation and hole expandability.
  • the “ferrite” indicates polygonal ferrite and bainitic ferrite.
  • the biggest feature in the metal structure of the high strength thin-gauge steel sheet is that the steel contains tempered marensite in an area fraction of 10 to 60%.
  • This tempered martensite is tempered and becomes a tempered martensite structure by heat treatment comprising cooling the martensite formed in the cooling process of the annealing to the martensitic transformation point or less, then holding at 150 to 400° C. for 1 to 20 minutes or by holding at a temperature 50 to 300° C. higher than the holding temperature to 500° C. for 1 to 100 seconds.
  • the area fraction of the tempered martensite is less than 10%, the hardness difference between the structures will become too large and no improvement in the hole expansion rate will be seen, while if over 60%, the strength of the steel sheet will drop too much. Further, it may be considered that by making the ferrite an area fraction of 10 to 85% and the residual austenite an area fraction of 1 to 10% for a good balance in the steel sheet, the elongation and hole expansion rate would be remarkably improved. If the ferrite area fraction is less than 10%, the elongation cannot be sufficient secured, while if the ferrite area fraction is over 85%, the strength becomes insufficient, so this is not preferable. Moreover, in the process of the present invention, 1% or more residual austenite remains.
  • the residual austenite With over a 10% residual austenite volume fraction, the residual austenite will transform to martensite transformation by working. At that time, voids or a large number of dislocations will occur at the interface of the martensite phase and the surrounding phases. Hydrogen will accumulate at such locations resulting in inferior delayed fracture characteristics, so this is not desirable.
  • bainite of the remaining structure can include untempered martensite in an area fraction of 10% or less with respect to the entire structure without any major effect on the quality.
  • a slab comprised of the above composition of ingredients is produced.
  • the slab is inserted into a heating furnace while at a high temperature or after cooling down to room temperature, heated at a temperature range of 1150 to 1250° C., then hot finished rolled a temperature range of 800 to 950° C. and coiled at 700° C. or less to obtain a hot rolled steel sheet. If the hot rolled final temperature is less than 800° C., the crystal grains become mixed grains and the workability of the matrix is lowered. If over 950° C., the austenite grains become coarse and the desired microstructure cannot be obtained.
  • a lower coiling temperature enables the formation of a pearlite structure to be suppressed, but if considering the cooling load as well, the temperature is preferably made a range of 400 to 600° C.
  • the cold rolling rate is preferably a range of 30 to 80% in terms of rolling load and material quality.
  • the annealing temperature is important in securing a predetermined strength and workability of high strength steel sheet and is preferably 600° C. to Ac 3 +50° C. If less than 600° C., sufficient recrystallization does not occur and the workability of the matrix itself is hard to stably obtain. Further, if over Ac 3 +50° C., the austenite grains coarsen, formation of ferrite is suppressed, and the desired microstructure becomes hard to obtain. Further, to obtain the microstructure prescribed by the present invention, the method of continuous annealing is preferable.
  • the sheet is cooled to 600° C. to Ar 3 at an average cooling rate of 30° C./s or less to form ferrite. If less than 600° C., pearlite precipitates and the quality degrades, so this is not preferred. If over Ar 3 , the predetermined ferrite area fraction cannot be obtained. Further, even if the average cooling rate is over 30° C./s, the predetermined ferrite area fraction cannot be obtained, so the average cooling rate was made 30° C./s or less, more preferably 10° C./s or less.
  • the sheet is treated by a heating and holding process in which it is held at a temperature range of 150 to 400° C. for 1 to 20 minutes. If less than 150° C., the martensite will not be tempered and the hardness difference between the structures will become large. Further, the bainite transformation will also be insufficient and the predetermined ductility and hole expandability will not be obtained. If over 400°, the sheet will be overly tempered and the strength will falls, so this is not desirable.
  • the upper limit is preferably made the martensitic transformation point or less.
  • the lower limit is preferably over the martensitic transformation point.
  • the holding time is less than 1 minute, the tempering and transformation do not progress much at all or remain incomplete, and the ductility and hole expansion rate are not improved. If over 20 minutes, the tempering and transformation substantially end, so there is no effect even with extending the time.
  • the heating and holding process may be one connected to the continuous annealing line or may be a separate line, but one connected to the continuous annealing facility or one performed in an averaging oven of the continuous annealing line is preferable in terms of productivity.
  • the above heating and holding process a first heating and holding process of heating and holding at 150 to 400° C. and holding for 1 to 20 minutes, then a second heating and holding process of heating to a temperature 30 to 300° C. higher than the holding temperature of the first heating and holding process to 500° C. for 1 to 100 seconds, then cooling.
  • the temperature of the second heating and holding process is less than the holding temperature of the first heating and holding process +30° C., the martensite is not tempered, the hardness difference between the structures becomes large, and the predetermined ductility and hole expandability cannot be obtained. If the temperature of the second heating and holding process is over the holding temperature of the first heating and holding process +300° C., the sheet will be overly tempered and the strength will fall, so this is not preferable.
  • the holding time is less than 1 second, the tempering will not proceed much at all or will remain incomplete and the ductility and hole expansion rate will not be improved. If over 100 seconds, the tempering substantially ends, so there is no effect even with extending the time.
  • the heating and holding process a first heating and holding process of heating and holding at 150 to 400° C. and holding for 1 to 20 minutes, then cooling to the martensitic transformation point or less, holding at the cooling end temperature to 500° C. for 1 to 100 seconds for second heating and holding, then cooling. If the temperature of the second heating and holding process is made the cooling end temperature when cooling to the martensitic transformation point or less +50 to 300° C. to 500° C. or less, tempered martensite can be reliably secured, so this is preferable.
  • the lower limit of the temperature of the second heating and holding process is more preferably the cooling end temperature +50° C. and the martensitic transformation point or more. If the cooling end temperature +300° C., it is more preferable. If the temperature of the second heating and holding process is over 500° C., the sheet is overly tempered and the strength drops, so this is not preferable.
  • the tempering does not progress much at all or remains incomplete and the ductility and hole expanding rate are not improved. If over 100 seconds, the tempering substantially ends, so there is no effect even with extending the time.
  • the steel sheet may also be cold rolled steel sheet or plated steel sheet.
  • the plating may be ordinary galvanization, aluminum plating, etc.
  • the plating may be either hot dipping or electroplating.
  • the steel sheet may be plated, then alloyed. It may also be plated by multiple layers. Further, even steel sheet comprised of non-plated steel sheet or plated steel sheet on which a film is laminated is not outside the present invention.
  • Tensile characteristics Evaluated by running tensile test in direction perpendicular to rolling direction of JIS No. 5 tensile test piece
  • Hole expansion rate Hole expansion test method of Japan Iron and Steel Federation standard JFST1001-1996 employed.
  • a conical punch with a 60° apex angle was forced through a ⁇ 10 mm punched hole (die inside diameter of 10.3 mm, clearance 12.5%) to form a burr of the hole in the outside direction by a speed of 20 mm/min:
  • Ferrite area fraction Ferrite observed by Nital etching.
  • the ferrite area fraction is quantified by polishing a sample by Nital etching (alumina finish), dipping it in corrosive solution (mixture of pure water, sodium pyrosulfite, ethyl alcohol, and picric acid) for 10 seconds, then polishing again, rinsing, then drying the sample by cooling air. After drying, a 100 ⁇ m ⁇ 100 ⁇ m area of the structure of the sample is measured for area by a Luzex system at a power of 1000 to determine the area% of the ferrite. In each table, this ferrite area fraction is shown as the ferrite area %.
  • the tempered martensite area fraction is quantified by polishing a sample by LePera etching (alumina finish), dipping it in corrosive solution (mixture of pure water, sodium pyrosulfite, ethyl alcohol, and picric acid) for 10 seconds, then polishing again, rinsing, then drying the sample by cooling air. After drying, a 100 ⁇ m ⁇ 100 ⁇ m area of the structure of the sample is measured for area by a Luzex system at a power of 1000 to determine the area % of the tempered martensite. In each table, this tempered martensite area fraction is shown as the tempered martensite area %.
  • Residual austenite volume fraction The residual austenite is quantized by MoKa beams from the (200), (210) area strength of the ferrite and the (200), (220), and (311) area strength of the austenite at the surface of the supplied sheet chemically polished to 1 ⁇ 4 the thickness from the surface and used as the residual austenite volume fraction. A residual austenite volume fraction of 1 to 10% or more is deemed good.
  • the residual austenite volume fraction is expressed as the residual y-volume % and rate.
  • test results of comparative examples of Experiment No. [8] shown in Table 2 of Example 1 are shown in Table 3. Further, the test results of Experiment No. [2] of the present invention are shown in Table 4, those of Experiment No. [6] are shown in Table 5, and those of Experiment No. [9] are shown in Table 6. Further, the test results of Example 2 are shown in Table 7.

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