US3453858A - Method of manufacturing cold rolled steel sheets - Google Patents

Method of manufacturing cold rolled steel sheets Download PDF

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Publication number
US3453858A
US3453858A US603206A US3453858DA US3453858A US 3453858 A US3453858 A US 3453858A US 603206 A US603206 A US 603206A US 3453858D A US3453858D A US 3453858DA US 3453858 A US3453858 A US 3453858A
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United States
Prior art keywords
steel sheets
rolled steel
primary
thickness
cold rolled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US603206A
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English (en)
Inventor
Kazuo Matsudo
Osamu Muroga
Yukio Hashimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
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Nippon Kokan Ltd
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Publication date
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Publication of US3453858A publication Critical patent/US3453858A/en
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    • 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
    • C21D8/0236—Cold rolling
    • 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
    • B21B1/24—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 continuous or semi-continuous process
    • B21B1/28—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 continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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
    • C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
    • 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
    • C21D8/0273—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
    • 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
    • C21D8/0468—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 between cold rolling steps
    • 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

Definitions

  • This invention relates to a method of manufacturing cold rolled steel sheets by means of a so called two-stage rolling process wherein primary and secondary reductions are relied upon. It is an object of this invention to reasonably produce cold rolled steel sheet of excellent quality by utilizing reduction rates which are most suitable for the characteristics required for the final products and which is determined dependent upon the thickness of the cold rolled steel sheets.
  • the invention contemplates the use of a two stage cold rolling method which permits the providing of a number of combinations instead of utilizing a single step rolling method.
  • Two stage rolling methods are already known in the art. For example, two step rolling methods have been proposed which are especially suitable 'for preparing steel sheets for tin plate and steel sheets for deep drawing.
  • novel steel sheets capable of exhibiting better mechanical properties ofpress shapability and formability than prior steel sheets by a suitable combination of the primary and secondary reduction rates.
  • the novel steel sheets can be prepared by only two stage rolling steps.
  • steel sheets are provided with required mechanical properties necessary for their respective applications.
  • the required combination of reduction rates which is most suitable to obtain products having properties suitable for intended applications for a given plate thickness of hot rolled steel plates or conversely to determine the thickness of the hot rolled steel plates which is essential to obtain properties most suitable for intended uses from the thickness of the cold rolled steel sheets to be pressed or the thickness of the products.
  • the invention can establish most effective method of manufacturing the steel sheets suitable for the intended use of the cold rolled steel sheets to be presed without knowing any special condition of manufacturing steel, hot rolling condition or annealing condition, and moreover since the novel invention does not require the addition'of a small quantity of any special element or elements, it is advantageous in that the cleanliness of the steel is high and the cost of manufacturing is economical.
  • the method of this invention can provide various types of products for various fields of applications, it is possible to alleviate loss of the properties which are unavoidable when steel sheets of the same quantity are used for a number of different purposes, thus giving rise to a large profit to the users.
  • FIG. 1 is an equi-height curve showing the relation between primary and secondary reduction rates and the index of the grain size (ASTM number) of one embodiment of this invention
  • FIG. 2 is a graph of equi-height curves showing the relation between primary and secondary reduction rates and the planar anisotropy
  • FIG. 3 is a similar graph of equi-height curves showing the relation of said primary and secondary reduction rates and the normal anisotropy
  • FIG. 4 is a combination of FIGS. 1, 2 and 3 and also represents an equi-thickness curve.
  • shapability and formability are required for steel which are to be pressed.
  • press formability it is required that such property means deformable ability of the steel sheets without any accompanying breakage in either the external force transmission portion or the portion of the sheet deformed thereby as is well known in the art, of the formability, stretchability can be best represented by Erichsen value whereas the deep drawability by Lankford value.
  • shapability means the ability of maintaining given configurations and dimensions during and often transmitting the external force for deformation.
  • the press-workability is basically determined -by grain size and textures of crystals.
  • the pressworkability of steel sheets is determined based upon the ASTM number which directly indicates the grain size as well as 7 and Ar which are directly related to the assembled structure of the grains, the method of this invention is carried out according to the most common manufacturing conditions of low carbon rimmed steel without the necessity of relying upon a special treatment in which elements in the steel which have large influences upon these factors are removed or such elements are incorporated. Further no special process is required in hot rolling steps of the material following the slabbing operation. Thus, the invention can be carried out under ordinary conditions of manufacturing steel to be pressed.
  • FIG. 4 is a graph to represent a combination of FIGS. 1 to 3.
  • Hot rolled steel strip utilized in these experiments were prepared from the same charge under the following manufacturing conditions.
  • a curve represents an equi-gauge for producing cold rolled steel strip of 0.8 mm. thick by employing a hot rolled steel strip of 5 mm. thick, which also represents the equi-gauge curve for producing cold rolled steel strip of 0.64 mm.
  • Step sheets for. productsv such as roofs and fenders of motor cars which require high degree of shapability may' be produced by employing a primary reduction rate of approximately 75% and decarburizing annealing treatment.
  • a primary reduction rate of approximately 75% was found suitable.
  • Curve in FIG. 4 represents an equi-gauge curve of cold rolled steel strip of 0.8 mm. thick obtained from hot rolled steel strip of 0.4 mm. thick. Again the curve -shows a large variation comparable with the curve which is obtained by suitable combination of reduction ratesflsi'milar results can also be obtained for other final sheet thickness, as can be noted from a curve i for the final sheet thickness of 1.2 mm. produced TABLE 3 Primary Grain Mean Planar reduction .size normal anisotrate, ASTM rop percent number ropy r Ar These were obtained under the standard annealing condition or at 7003C. for 5 hours (both for intermediate and final annealing treatments) which were indicated be fore. By treating these strips under ordinary decarburizing annealing conditions, namely, K
  • Coils A, B, C and D were rolled using the reduction rate shown in curve in FIG. 4, while coil E was rolled by a single rolling operation.
  • Thickness 0.8 mm. for respective coils. Reduction rates:
  • the primary and secondary reduction rates for A, B, C and D respectively represented by cross-points P, Q and R on the curve in FIG. 4. Since E is a control material which was prepared by a single rolling operation, the reduction rate thereof is represented by a crosspoint 0 on the secondary cold reduction line.
  • coils A and C have satisfactory mechanical properties which can assure good shapability as in the case of drawability, it is evident that a reduction rate of the order for the coil B results in excellent result in order to impart the maximum shapability.
  • FIG. 4 shows that this is not limited for only the hot rolled steel strip having a thickness of 5 mm., but rolled hot steel strip having any other thickness show the same trends.
  • Coil F Up to the slab, the same factory experiment as mentioned above was used. Hot rolling conditions:
  • the invention provides a method of manufacturing cold rolled steel sheets which can preserve their mechanical characteristics suitable for their end purpose by a two step cold rolling method.
  • the investigation makes it possible to use most effectively the same material and greatly benefits both the maker as well as the user of such cold rolled steel sheets.
  • a method of manufacturing cold rolled steel sheets comprising the steps of cold rolling sheet steel material by a two step rolling operation having a combination of primary and secondary reduction rates, which imparts to the final cold rolled sheet grain size, normal anisotropy, and planar anisotropy resulting from the combination of primary and secondary cold rolling reduction rates, and annealing at a standard annealing condition selected arbitrarily.
  • a method of manufacturing cold rolled steel sheets consisting primarily of rolling the steel sheets initially at a preselected primary reduction and then rolling the sheets according to a preselected secondary reduction rate, both of said rates together reducing the sheets from an initial thickness to a predetermined final thickness thereof, said primary and secondary reduction rates being selected according to the desired grain size, normal anisotropy, and planar anisotropy.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
US603206A 1965-12-22 1966-12-20 Method of manufacturing cold rolled steel sheets Expired - Lifetime US3453858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7851765 1965-12-22

Publications (1)

Publication Number Publication Date
US3453858A true US3453858A (en) 1969-07-08

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ID=13664114

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US603206A Expired - Lifetime US3453858A (en) 1965-12-22 1966-12-20 Method of manufacturing cold rolled steel sheets

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US (1) US3453858A (en:Method)
BE (1) BE691645A (en:Method)
FR (1) FR1507399A (en:Method)
GB (1) GB1173440A (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759081A (en) * 1969-07-28 1973-09-18 Nippon Kokan Kk Method of manufacturing steel plates for extra deep drawing
US5054302A (en) * 1989-04-07 1991-10-08 Kawasaki Steel Corporation Hardness compensated thickness control method for wet skin-pass rolled sheet
US20140110086A1 (en) * 2011-07-21 2014-04-24 Panasonic Corporation Cooling apparatus, electronic apparatus provided with same, and electric vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325190A (en) * 1939-06-05 1943-07-27 Wheeling Steel Corp Metal rolling
US3130614A (en) * 1957-10-03 1964-04-28 Lasalle Steel Co Method for controlling residual stresses in metal
US3309906A (en) * 1963-04-22 1967-03-21 Inland Steel Co Light gauge, hot dip metal coated steel products
US3332263A (en) * 1963-12-10 1967-07-25 Gen Electric Computer control system for metals rolling mill

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325190A (en) * 1939-06-05 1943-07-27 Wheeling Steel Corp Metal rolling
US3130614A (en) * 1957-10-03 1964-04-28 Lasalle Steel Co Method for controlling residual stresses in metal
US3309906A (en) * 1963-04-22 1967-03-21 Inland Steel Co Light gauge, hot dip metal coated steel products
US3332263A (en) * 1963-12-10 1967-07-25 Gen Electric Computer control system for metals rolling mill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759081A (en) * 1969-07-28 1973-09-18 Nippon Kokan Kk Method of manufacturing steel plates for extra deep drawing
US5054302A (en) * 1989-04-07 1991-10-08 Kawasaki Steel Corporation Hardness compensated thickness control method for wet skin-pass rolled sheet
US20140110086A1 (en) * 2011-07-21 2014-04-24 Panasonic Corporation Cooling apparatus, electronic apparatus provided with same, and electric vehicle

Also Published As

Publication number Publication date
GB1173440A (en) 1969-12-10
DE1508429A1 (de) 1973-08-23
FR1507399A (fr) 1967-12-29
BE691645A (en:Method) 1967-05-29
DE1508429B2 (de) 1975-07-24

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