US3821031A - Method for manufacturing cold rolled steel having excellent drawability - Google Patents

Method for manufacturing cold rolled steel having excellent drawability Download PDF

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Publication number
US3821031A
US3821031A US00101317A US10131770A US3821031A US 3821031 A US3821031 A US 3821031A US 00101317 A US00101317 A US 00101317A US 10131770 A US10131770 A US 10131770A US 3821031 A US3821031 A US 3821031A
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US
United States
Prior art keywords
steel
cold rolled
steels
aluminum
degassing
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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
US00101317A
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English (en)
Inventor
H Kubotera
Y Hashimoto
T Shimomura
N Tanaka
K Matsudo
M Ohkubo
H Gonda
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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Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3821031A publication Critical patent/US3821031A/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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

Definitions

  • ABSTRACT Primary Examiner-Charles N. Lovell Attorney, Agent, or Firm-Flynn and Frish Stamm 571 ABSTRACT A method for producing cold rolled drawing quality steels containing less than 0.01% C and less than 0.50% Mn in which an inert or decarburizing gas is blown through a molten steel which is then vacuum degassed, cast either into ingots o'r continuouslycast, hot and cold rolled and then subjected to a rapid continuous anneal at a temperature: of at least 650C.
  • aluminum-killed steel When the aluminum-killed steel is produced, aluminum is added to said molten steel in a sufficient amount to provide more than 0.02% soluble aluminum in the steel, and the hot rolled steel is coiled at a temperature above 630C to precipitate aluminum nitride.
  • the present invention relates to a method for manufacturing cold rolled drawing quality steel which combines a specific degassing method, hot rolling conditions and a short rapid annealing step such as continuous annealing.
  • cold rolled steel sheets for drawing are generally manufactured by heating sheets for a long period of time in a box annealing furnace.
  • the conventional method requires a long annealing time and considerable space for the annealing furnace installation. Further, it was impossible to heat the entire length of a coil uniformly and obtain a uniform quality therethrough.
  • the continuous annealing method has such advantages as high annealing efficiency per unit, and uniformity in quality in the direction of the coil length.
  • the continuous anneal method has drawbacks such as insufficient grain growth due to rapid heating and short soaking timeand it is impossible to achieve grain growth in the direction advantageous for deep drawing. Further, precipitation of carbon as carbides in the steel is not possible due to rapid quenching after soaking. The inferior qualities of the steel such as an increase in yield stress and aging properties and a decrease in total elongation is noticeable.
  • the continuous annealingmethod has conventionally only been applied for manufacturing hard hot cold rolled steel sheets for plates for tin plating rather than for steel sheets for deep drawing.
  • manufacture of cold rolled steel sheets for drawing having properties such as improved annealing efficiency and uniformity in the quality of the steels normal with the continuous annealing method, could be achieved.
  • the present invention was developed to provide such a method asaforementioned after various researches.
  • FIG. 1(a) and FIG. 1(b) represent cross sectional views of the lower part of two degassing apparatus used in the present invention.
  • the present invention aims to provide a method for manufacturing cold rolled steel sheets for drawing wherein a specific degassing method is performed wherein inert gas or the like is blown through porous bricks arranged at the bottom of the ladle shown in FIGS. la and lb to facilitate reactions a conventional degassing is performed followed by conventional hot rolling, cold rolling, and a continuous anneal.
  • porous bricks 2 are arranged at the bottom of ladle 1 and inert gas or other I gas facilitating a decarburizing reaction is supplied from a gas cylinder 3 through the porous bricks 2 and othergas supplying ports.
  • the following table 1 shows the results of an experiment wherein the low carbon steel was melted by means of a t, converter the amount of oxygen in the molten steel being slightly adjusted with aluminum 20 gassing method in which argon gas was blown through after tapping and the steel then being treated by a dethe porous bricks arranged at the bottom of the ladle mentioned above.
  • samples 1 through 3 were treated by the degassing method of the present invention. 4 through 6 by a conventional degassing method.
  • the molten steel degassed is either made into an ingot or continuously cast after adding alloying additions such as Mn, Al or the like according to requirements after the desired degree of degassing is attained.
  • Example 1 An example of continuous annealing tests upon steels selected from the steels tapped and treated by the present and conventional degassing methods is shown.
  • the following table 2 shows the result of the check analysis of hot rolled steel sheets. Seven kinds of the steels, A, B, C, F, G, H and I in table 2 were obtained by the degassing treatment.
  • the steels A and F among said steels were processed into degassed ultra-low carbon steels by way of the specific degassing method mentioned above.
  • the steels A, B and C were tapped after degassing without using such a deoxidizer as Al, Ti or the like. Further, the steels F, G, H and I were deoxidized with Al after the desired degree of degassing was attained.
  • Conventional rimmed steel (steel D) andaluminum killed steel (steel 1) are for comparative purposes.
  • Table 4-l below shows the results of the standard metallurgical test upon the steels without addition of such a deoxidizer as Ti, Al or the like.
  • Table 4-2 shows the results of tests upon aluminum killed steels to which Al was added after the desired degree of degassing is 55 attained, then hot rolled and coiled at high temperature ranging from 670C to 700C and
  • Table 4-3 shows the test results on said steels coiled at temperatures of According tothese results, the steels to which such a deoxidizer as Al, Ti or the like was not added were inferior in quality in proportion to the increase of C content.
  • the properties for an ordinary 'cold rolled steel sheet for drawing can be obtained only in steels containing less than 0.010 percent of C. Such a steel is characterized in that although the properties such as the yield point, the aging properties are relatively inferior, it has remarkable drawability (Lankford value) as compared with aluminumkilled steels of Tables 4-2 and 4-3.
  • the steels H and l in which C content is not decreased sufficiently show great inferiority in aging properties and total elongation, so that it may be said that it is necessary to reduce the carbon content to less than 0.010 percent by the degassing process. That is to say, cold rolled steel sheets having excellent drawability can be manufactured by continuously annealing aluminum killed steels after decreasing C content thereof to less than 0.010 percent and finishing hot rolling and coiling at temperatures sufficient to precipitate aluminum nitride.
  • the elements existing as soluble elements (C, N, Mn, A1 or the like) and impurities in the steel are as low as possible in view of grain-growth both at the time of high temperature coiling and the process of continuous annealing. Moreover, it is desirable that the finishing temperature of hot rolling is made as high as possible.
  • the steels of the present invention can be continuously cast. Said steels tapped show no generation of gas bubbles during casting and show a similar solidrfica tion of that of killed steels.
  • Table 4-1 (thickness of steel sheet: 0.5 mm) Aging Yield Yield Tensile Total index point elon ation strength elongation Erichsen numbers Mark (kg/mm) (50) (kg/mm) (mm) (kg/mm) A 20.8 0 30.8 47.8 10.8 6.4 B 23.7 0 32.6 43.4 10.4 6.6 C 25.4 0 34.8 39.8 9.8 7.3 D 26.1 0 38.
  • Table 4-2 4 (thickness of steel sheet: 0.5 mm) Aging Yield Yield Tensile Total index point elongation strength elongation Erichsen r numbers Mark (kg/mm (kg/mm (mm) (kg/mm) "T5613 l W (thickness of steel sheet: 0.5 mm) Aging Yield 7 Yield Tensile Total index point elongation strength elongation Erichsen r numbers Mark (kg/mm) (kg/mm) (mm) (kg/mm) (kg/mm) (kg/mm)
  • possimolten steel to provide said steel with a soluble alumible to manufacture cold rolled steel sheets for drawing num content of more than 0.02 percent; casting said which have excellent and uniform properties, with high molten steel; hot rolling said steel, and then coiling at annealing efficiency.
  • the present invention a temperature above 630C whereby the aluminum nican be applied in wide fields, for example, for manufactride-formed by reaction of said soluble aluminum with turing steel sheets for surface treatment for drawing. nitrogen in said steel is precipitated; cold rolling said
  • the embodiments of the invention in which an exclusteel; and then rapidly annealing said steel at a tempersive property or privilege is claimed are defined as folature of about 650C in a continuous annealing apparalows: tug, g l.
  • a method for manufacturing aluminum-killed cold 2. The method of claim 1 wherein said molten steel rolled sheet steel containing less than 0.01 percent C is cast as an ingot. and less than 0.40 percent Mn having excellent drawing 3.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US00101317A 1969-12-27 1970-12-24 Method for manufacturing cold rolled steel having excellent drawability Expired - Lifetime US3821031A (en)

Applications Claiming Priority (1)

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JP10496969 1969-12-27

Publications (1)

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US3821031A true US3821031A (en) 1974-06-28

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US00101317A Expired - Lifetime US3821031A (en) 1969-12-27 1970-12-24 Method for manufacturing cold rolled steel having excellent drawability

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US (1) US3821031A (de)
CA (1) CA931483A (de)
DE (1) DE2063605A1 (de)
FR (1) FR2072077B1 (de)
GB (1) GB1308167A (de)
NL (1) NL7018317A (de)
SE (1) SE405984B (de)
ZA (1) ZA708646B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988173A (en) * 1972-04-03 1976-10-26 Nippon Steel Corporation Cold rolled steel sheet having excellent workability and method thereof
US3988174A (en) * 1972-04-03 1976-10-26 Nippon Steel Corporation Hot rolled steel sheet having excellent workability and method thereof
US4066474A (en) * 1974-01-31 1978-01-03 Nippon Kokan Kabushiki Kaisha Method of making high strength cold reduced steel by continuous annealing process
US4116729A (en) * 1977-09-09 1978-09-26 Nippon Steel Corporation Method for treating continuously cast steel slabs
US4144379A (en) * 1977-09-02 1979-03-13 Inland Steel Company Drawing quality hot-dip coated steel strip
DE2942338A1 (de) * 1978-10-21 1980-04-24 Nippon Steel Corp Verfahren zur herstellung von alterungsbestaendigem kaltgewalztem stahlband
FR2521039A1 (fr) * 1982-02-09 1983-08-12 Nippon Steel Corp Procede de fabrication d'une tole d'acier laminee a froid ayant d'excellentes qualites de formage
EP0521808A1 (de) * 1991-07-04 1993-01-07 Sollac Verfahren zum Herstellen von Tiefziehblechen
US5603749A (en) * 1995-03-07 1997-02-18 Bethlehem Steel Corporation Apparatus and method for vacuum treating molten steel
FR2838990A1 (fr) * 2002-04-29 2003-10-31 Mannesmann Roehren Werke Ag Procede pour fabriquer un acier calme a l'aluminium

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1464232A (en) * 1974-04-26 1977-02-09 Nippon Kokan Kk Method of making cold-reduced al-killed steel strip for press- forming by continuous casting and continuous annealing process
FR2433583A1 (fr) * 1978-08-18 1980-03-14 Nippon Steel Corp Cuve de prelevement de metal d'un bain de metal fondu, pour son traitement

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988173A (en) * 1972-04-03 1976-10-26 Nippon Steel Corporation Cold rolled steel sheet having excellent workability and method thereof
US3988174A (en) * 1972-04-03 1976-10-26 Nippon Steel Corporation Hot rolled steel sheet having excellent workability and method thereof
US4066474A (en) * 1974-01-31 1978-01-03 Nippon Kokan Kabushiki Kaisha Method of making high strength cold reduced steel by continuous annealing process
US4144379A (en) * 1977-09-02 1979-03-13 Inland Steel Company Drawing quality hot-dip coated steel strip
US4116729A (en) * 1977-09-09 1978-09-26 Nippon Steel Corporation Method for treating continuously cast steel slabs
US4315783A (en) * 1978-10-21 1982-02-16 Nippon Steel Corporation Method of producing non-ageing cold rolled steel strip with excellent deep-drawability by continuous heat treatment
DE2942338A1 (de) * 1978-10-21 1980-04-24 Nippon Steel Corp Verfahren zur herstellung von alterungsbestaendigem kaltgewalztem stahlband
FR2521039A1 (fr) * 1982-02-09 1983-08-12 Nippon Steel Corp Procede de fabrication d'une tole d'acier laminee a froid ayant d'excellentes qualites de formage
DE3304064A1 (de) * 1982-02-09 1983-08-25 Nippon Steel Corp., Tokyo Verfahren zur herstellung eines kaltgewalzten stahlbleches mit ausgezeichneter formbarkeit
US4478649A (en) * 1982-02-09 1984-10-23 Nippon Steel Corporation Method for producing a cold-rolled steel sheet having excellent formability
EP0521808A1 (de) * 1991-07-04 1993-01-07 Sollac Verfahren zum Herstellen von Tiefziehblechen
FR2678641A1 (fr) * 1991-07-04 1993-01-08 Lorraine Laminage Acier a emboutissabilite amelioree et procede de fabrication de toles destinees a l'emboutissage.
US5232524A (en) * 1991-07-04 1993-08-03 Sollac Process for the production of thin sheet metals intended for deep-drawing
US5603749A (en) * 1995-03-07 1997-02-18 Bethlehem Steel Corporation Apparatus and method for vacuum treating molten steel
FR2838990A1 (fr) * 2002-04-29 2003-10-31 Mannesmann Roehren Werke Ag Procede pour fabriquer un acier calme a l'aluminium

Also Published As

Publication number Publication date
NL7018317A (de) 1971-06-29
FR2072077B1 (de) 1974-04-26
ZA708646B (en) 1971-11-24
FR2072077A1 (de) 1971-09-24
SE405984B (sv) 1979-01-15
DE2063605A1 (de) 1971-07-15
CA931483A (en) 1973-08-07
GB1308167A (en) 1973-02-21

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