US3865637A - Process of making cold reduced steel - Google Patents

Process of making cold reduced steel Download PDF

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Publication number
US3865637A
US3865637A US109446A US10944671A US3865637A US 3865637 A US3865637 A US 3865637A US 109446 A US109446 A US 109446A US 10944671 A US10944671 A US 10944671A US 3865637 A US3865637 A US 3865637A
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US
United States
Prior art keywords
steel
annealing
temperature
cold reduced
making
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
US109446A
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English (en)
Inventor
Kazuo Matusdo
Takayoshi Shimomura
Kooichi Oosawa
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
Original Assignee
Nippon Kokan Ltd
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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3865637A publication Critical patent/US3865637A/en
Anticipated expiration legal-status Critical
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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
    • C21D8/04—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
    • 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
    • C21D8/04—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

Definitions

  • This invention relates to an improved process of making cold reduced steel having good press formability which is specially possible to be produced in large scale by continuous annealing line.
  • This invention is developed to improve the above fault and to make the effect of said decarburizing process demonstrate fully.
  • the features of this invention lie in decarburizing hot strip before cold reducing of the strip. How to treat the decarburized hot strip is sufficient to depend on ordinary steps, which is coldreduced, box-annealed or passed through continuous annealing line and then temper-rolled. Press formability of said strip treated with the above steps in far better than that of the common process.
  • an object of this invention is to provide and improved process of making cold reduced steel having for more excellent press forwability than that of the steel produced by conventional process.
  • Another object of this invention is to provide an improved process of making cold reduced steel being capable to demonstrate good drawability even in the case of being treated with common continuous annealing line.
  • low carbon rimmed steel ingot should be made within the range of 0.03% to 0.06% carbon and 0.05% to 0.10% oxygen in steel making furnace.
  • the hot strip which is rolled from the above ingot, is decarburized at less than 780C temperature and then is cold-reduced in the ordinary manner. Such a cold-reduced strip is finally annealed at a temperature of less than A point to more than recrystallization temperature of the steel and then is temper-rolled.
  • the reason that said carbon content is limited to the range of 0.03% to 0.06% is as follows: less than 0.03% carbon is impossible to be made with the ordinary steel making process, and more than 0.06% carbon is difficult to be effectively decarburized.
  • the reason that said oxygen content is limited to the range of 0.05% to 0.10% lies in that less than 0.05% oxygen causes said ferrite grain to coarsen, and more than 0.10% oxygen gives a great damage to cleanliness of the steel.
  • the interrelation between the above oxygen content and decarburization temperature is the most improtant factor in this invention.
  • the accompanying drawing shows the results of the above interrelation, which is obtained by many experiments.
  • the scope that uniform grain is possible to be obtained is the region enclosed by oxygen content of more than 0.05% and decarburization temperature of less than 780C.
  • the region of more than 0.06% oxygen and less than 750C should be recommended as the most preferable scope.
  • the scope of less than 0.05% oxygen and more than 770C decarburization temperature is scarcely employed, because it is confirmed as the region of coarsening grain. This is the reason that decarburization temperature is limited to less than 780C.
  • Such a decarburizing annealing is carried out with common open coil annealing furnace.
  • the strip after cold reducing is annealed at a temper ature of more than recrystallization temperature to less than A point.
  • a final annealing can be put into practice with either box type annealing furnace of continuous annealing furnace. It is, in the case of the latter, confirmed that there is shown many advantages in comparison with the common continuous annealing process. Firstly, the mechanical properties of this invention steel is far better than that of the steel produced by common continuous annealing process, as mentioned later. Secondly, while decarburization annealing in this invention is carried out for hot rolled strip, solution carbon in ferrite becomes very low, consequently aging resistibility of the steel is possible to be improved.
  • the annealing temperature near A point is possible to be employed as mentioned later. Even though such a high temperature, there is no coarsening of recrystallized grain. This is a large advantage and a great improvement of mechanical properties is obtained. It is needless to say that the same effect as mentioned above will be obtained in the case of said box type annealing.
  • finishing temperature 850C coiling temperature: 595C thickness of strip: 2.3mm
  • EXAMPLE ll Producing requirments are the same as those of Example l, except soaking temperature of the continuous annealing.
  • Example 1 A steel compared with Example 1 and ll was produced by the ordinary continuous annealing process. That is, the making conditions are the same as those of said Example, except the annealing condition.
  • the mechanical properties of the steel is as follows:
  • EXAMPLE lV Producing requirements are the same as those of Example lll, except soaking temperature of the box type annealing,
  • Examplex lll and IV was produced by the ordinary box type annealing process. That is, the making conditions are the same as those of said Example, except the annealing condition:
  • An improved process of making cold reduced steel consisting in producing low carbon rimmed steel of 0.03 to 0.06% C and 0.05 to 0.10% O, decarburizing said steel at less than 780C, cold-reducing said steel,
  • ing temperature is less than 750C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
US109446A 1970-02-02 1971-01-25 Process of making cold reduced steel Expired - Lifetime US3865637A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45008451A JPS5025417B1 (enrdf_load_stackoverflow) 1970-02-02 1970-02-02

Publications (1)

Publication Number Publication Date
US3865637A true US3865637A (en) 1975-02-11

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US109446A Expired - Lifetime US3865637A (en) 1970-02-02 1971-01-25 Process of making cold reduced steel

Country Status (5)

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US (1) US3865637A (enrdf_load_stackoverflow)
JP (1) JPS5025417B1 (enrdf_load_stackoverflow)
DE (1) DE2104824B2 (enrdf_load_stackoverflow)
FR (1) FR2078063A5 (enrdf_load_stackoverflow)
GB (1) GB1352930A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087289A (en) * 1976-03-27 1978-05-02 Nippon Steel Corporation Anti-vibration steel material and a production method therefor
US4339284A (en) * 1979-02-27 1982-07-13 Kawasaki Steel Corporation Method of producing non-ageing cold rolled steel sheets
CN109266963A (zh) * 2018-10-09 2019-01-25 苏州翔楼新材料股份有限公司 一种商用车离合器骨架大钢片材料生产工艺

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313770A (en) * 1979-06-28 1982-02-02 Sumitomo Metal Industries, Ltd. Method of producing cold rolled steel strip having improved press formability and bake-hardenability
DE19701443A1 (de) * 1997-01-17 1998-07-23 Thyssen Stahl Ag Stahl

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3178318A (en) * 1962-10-22 1965-04-13 Yawata Iron & Steel Co Process for producing nonageing super deep-drawing steel sheets
US3215567A (en) * 1961-09-16 1965-11-02 Kawasaki Steel Co Deep drawing non-aging cold rolled steel sheet and a method of producing the same
US3239390A (en) * 1961-04-12 1966-03-08 Yawata Iron & Steel Co Method of producing non-ageing special low carbon iron sheets
US3248270A (en) * 1961-07-18 1966-04-26 Bethlehem Steel Corp Method of producing deep drawing steel
US3264144A (en) * 1962-09-13 1966-08-02 Youngstown Sheet And Tube Co Method of producing a rolled steel product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239390A (en) * 1961-04-12 1966-03-08 Yawata Iron & Steel Co Method of producing non-ageing special low carbon iron sheets
US3248270A (en) * 1961-07-18 1966-04-26 Bethlehem Steel Corp Method of producing deep drawing steel
US3215567A (en) * 1961-09-16 1965-11-02 Kawasaki Steel Co Deep drawing non-aging cold rolled steel sheet and a method of producing the same
US3264144A (en) * 1962-09-13 1966-08-02 Youngstown Sheet And Tube Co Method of producing a rolled steel product
US3178318A (en) * 1962-10-22 1965-04-13 Yawata Iron & Steel Co Process for producing nonageing super deep-drawing steel sheets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087289A (en) * 1976-03-27 1978-05-02 Nippon Steel Corporation Anti-vibration steel material and a production method therefor
US4339284A (en) * 1979-02-27 1982-07-13 Kawasaki Steel Corporation Method of producing non-ageing cold rolled steel sheets
CN109266963A (zh) * 2018-10-09 2019-01-25 苏州翔楼新材料股份有限公司 一种商用车离合器骨架大钢片材料生产工艺

Also Published As

Publication number Publication date
JPS5025417B1 (enrdf_load_stackoverflow) 1975-08-23
GB1352930A (en) 1974-05-15
DE2104824A1 (de) 1971-08-26
DE2104824B2 (de) 1974-02-28
FR2078063A5 (enrdf_load_stackoverflow) 1971-11-05

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