US3239389A - Deep drawing cold rolled rimmed steel sheet and strip and production of the same - Google Patents

Deep drawing cold rolled rimmed steel sheet and strip and production of the same Download PDF

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Publication number
US3239389A
US3239389A US286995A US28699563A US3239389A US 3239389 A US3239389 A US 3239389A US 286995 A US286995 A US 286995A US 28699563 A US28699563 A US 28699563A US 3239389 A US3239389 A US 3239389A
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United States
Prior art keywords
steel sheet
strip
steel
cold rolled
rimmed
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Expired - Lifetime
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US286995A
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English (en)
Inventor
Yoshida Hiroshi
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JFE Steel Corp
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Kawasaki Steel Corp
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Publication date
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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
    • 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
    • C21D8/0447—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
    • C21D8/0457—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 with diffusion of elements, e.g. decarburising, nitriding
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C21D3/08—Extraction of nitrogen
    • 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

  • an aluminum stabilized steel has been widely employed as a deep drawing steel sheet and strip.
  • the aluminum stabilized steel sheet or strip is produced by the steps "of making a steel ingot which has been deoxidized to 'a high degree by aluminum in an ingot casting 'step followed by a hot rolling step and a cold rolling one, and annealing the steel sheet or strip to precipitate aluminum nitride, whereby an elongated "grain structure is formed in it.
  • the steel sheet or strip provided with the above quality in accordance with this invention has been accomplished by the process comprising the steps of adding lead or lead and one or more of the-elements selected from the group consisting of antimony, bismuth and niobium into a molten steel produced by the open hearth furnace, the electric furnace or the converter in either a steel making or ingot casting step to obtain rimmed steel ingots containing lead. or lead and one or more of said elements singly or combined in a'total amount of 0.0030.100% by weight, then subjecting said steel to hot and. cold rolling, then annealing the cold rolled rimmed steel sheet or strip at a temperature of 500-7 50 C. in an atmosphere containing hydrogen and moisture to decarburize its carbon content less than 0.020% or decarburize and denitride its carbon content less than0.020% and its nitrogen con tent less than 0.002%.
  • the decarburizing annealing step and. the decarburizing and denitriding annealing one described in the present invention are achieved by subjecting the cold rolled rimmed steel sheet or strip to an anneal in an atmosphere Patented Mar. 8, 1966 ICC containing hydrogen and moisture at the temperature of 500-750 C. for a predetermined period of time.
  • the period of time required for the anneal depends upon the steel sheet thickness and the composition of the atmosphere.
  • the velocity of decarburization is relatively so fast that carbon is removed sufficiently at an early period of the anneal, but, on the other hand, the velocity of denitridation is so low even in an atmosphere, such as, AX gas, containing a low nitrogen content that it will take a pretty long period of time until a desired low nitrogen content is attained in the steel sheet.
  • an atmosphere such as, AX gas
  • denitridation is hardly effected even in the atmosphere containing a high nitrogen to decrease the carbon and nitrogen contents thereof as low as possible by subjecting it to annealing in the atmosphere consisting of a major part of H and a minor part of N and H 0.
  • an annealing step in the atmosphere consisting of a major part of N and a minor part of H and H 0, such as DX gas with appropriate moisture, for a relatively short period with a view to decarburizing only is relied upon to produce a cold rolled rimmed steel sheet or strip having a better drawability than that of the commercial one of prior art.
  • a preferred embodiment of this invention comprises making steel by the known basic open hearth furnace, adding lead to the thus obtained molten steel, and producinga rimmed steel ingot containing 0.060% carbon and 0.035% lead.
  • a cold rolled strip coil of 0.8 mm. in thickness is produced by the known process of slabbing, hot rolling and cold rolling.
  • this strip coil is subjected to a decarburizing annealing in an open coil annealing furnace at about 700 C. for a period of 40 hours in DX atmosphere with moisture, and to known skin pass rolling, which results in the production of excellent deep drawing cold rolled. steel sheet and having the following prop- 'erties: E 1.55, Er 11.70 mm., C.C.V. 36.65 mm, T.S.
  • Another preferred embodiment of this invention comprises making steel by the known basic open hearth furnace, adding lead to the thus obtained molten steel, and producing a rimmed steel ingot containing 0.08% carbon and 0.030% lead. Then, a cold rolled strip coil of 0.8 mm. in thickness is produced by the known process of slabbing, hot rolling and cold. rolling. Subsequently, this strip coil is subjected to a decarburizing and denitriding annealing in an open coil annealing furnace at about 700 C. for a period of 40 hours in AX atmosphere with moisture, and to known skin pass rolling, which results in the production of excellent deep drawing cold rolled steel sheet and having the following properties: 1.55, Er 11.8, C.C.V. 36.6, T.S. 29.4 kg./mm. and El. 48%.
  • X-ray lnversepo determined on the commercial containing various amounts of lead, antimony, bismuth and niobium.
  • One of the features of this invention is to pro amount of lead or lead and one or more of an bismuth and niobium to the steel and subject thus produced steel to heat treatment.
  • the steel sheet or strip of this invention can be produced from a relatively low cost rimmed steel, therefore it is les than the aluminum stabilized steel or strip.
  • the steel sheet or strip of this invention is superior to LLLLLLLLLLLL Specimen N o.
  • FIG. 1 The principle of the test is illustrated in FIG. 1. I A circular blank is rested .horizontally in the conical die, and drawn with the ppropriate punch until the bottom of the cup fractures. The dimensional specifications are given in Table 3.
  • the die hole diameters specified are such that'no'ironing of the cup occurs as it enters the die hole. Blanks should 'be cleaned and then lubricated and the speed of drawing is virtually immaterial.
  • FIGS. 23 represent by the numerical value, mm., of the average diameter of the rim of the conical cup when'fracture 'ocours as shown in FIGS. 23.
  • the conical cup value shown in FIG. 3, which is'less than that of FIG. 2, is obtained from the steel sheet having a better deep drawability than that of the one shown in FIG. 2.
  • the shape of the completely drawn cup with no fracture shown-in FIG. 4 is attained by the steel sheet of a very high deep drawability, and in this case, no value of conical cup test is obtained, but represented as, drawn throng in Table 1.
  • C.C.V. of various steel sheet listed in Table 1 are the measurements conducted on the sheet of the thickness, 0.8 mm. by means of the die type 17 of Table 3.
  • Table 4 the minimum standard value for showing the drawability of each sheet of a particular thickness produced by the'process of'this invention is listed.
  • the plastic strain ratio, R is a value showing the deep. drawing property and the preferred orientation suitable for the deep drawability of the steel sheet, and can be obtained from the following formula:
  • W width of tensile test specimen before tension
  • the crystallographic orientation of the rimmed steel sheet of. this invention containing a small amount of lead,.antimony, bismuth and niobium is different from that of the known rimmed steel sheet which has been decarburized and denitrided.
  • the X-ray intensity of (111) plane diffraction peak of the known rimmed steel is small while that ofthe steel sheet produced from the known rimmed steel which has been subjected to the decarburizing and denitriding annealingis also relatively small.-
  • the i value of the commercial rimmedsteel is the leastof all, that. of i the decarburized and denitrided rimmed steel larger, and" that of the aluminumstabilized steel the largest.
  • the E3 value of the present decarburized and denitrided rimmed 1 steelsheetcontaining lead, antimony, bismuth and 'niobium is also equal to orlarger than that-of the aluminum,
  • specimens of the sheet steel containing 0.022% Sb+0.025,% Pb and.0. ()28% Sb+0.041% Pbare drawn through without. fracture, respectively.
  • Table '2. shows the results ,of'various: practical'press forming tests conducted on various steel-sheet. In each press forming test'shown in Table 2, the stretch form-,
  • the commercial rimmed steel sheet of prior art and if the The above-mentioned relationship is made carbon and nitrogen content can be reduced by the decarburizing and denitriding annealing, the present steel will be given the non-aging property. However, from an industrial and economical point of view, it will be adequate if no stretcher-strains occur in press forming.
  • the steel sheet or strip of the invention will have an adequate non-aging quality if the elements, carbon, nitrogen, lead, antimony, bismuth and niobium are contained in the steel in the above-mentioned range.
  • a method for producing cold rolled rimmed steel sheet and strip having good drawability and stretchability comprising the steps of adding lead to molten steel to produce a rimmed steel containing said element in an amount of 0.0030.100% by weight, making a cold rolled rimmed steel sheet or strip through hot and cold rolling procedure, and subjecting said steel sheet or strip to a decarburizing anneal to decrease its carbon content to less than 0.020% by weight.
  • a method for producing cold rolled rimmed steel sheet and strip having good drawability and stretchability comprising the steps of adding lead to molten steel to produce a rimmed steel containing said element in an amount of 0.0030.100% by weight, making a cold rolled rimmed steel sheet or strip through hot and cold rolling procedure, and subjecting said steel sheet or strip to a decarburizing and denitriding anneal to decrease its carbon content to less than 0.020% and its nitrogen content to less than 0.002%.
  • a cold rolled, decarburized rimmed steel sheet and strip characterized by good drawability and stretchability, said steel consisting essentially of 0.0030.l00% lead, less than 020% carbon, OAS-0.60% manganese, and the balance iron and incidental impurities.
  • the steel sheet and strip according to claim 9 which includes at least one element selected from the group consisting of antimony, bismuth and niobium.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
US286995A 1962-07-11 1963-06-11 Deep drawing cold rolled rimmed steel sheet and strip and production of the same Expired - Lifetime US3239389A (en)

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Application Number Priority Date Filing Date Title
JP2916662 1962-07-11
JP4627562 1962-10-18

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GB (1) GB1055185A (en, 2012)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404047A (en) * 1965-12-20 1968-10-01 United States Steel Corp Method for producing deep-drawing low-carbon steel sheet
US3865645A (en) * 1971-12-27 1975-02-11 Nippon Steel Corp Cold-rolled steel sheet for press-forming

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE658771A (en, 2012) * 1964-01-25
JPS5468717A (en) * 1977-11-11 1979-06-02 Kawasaki Steel Co Production of unidirectional silicon steel plate with excellent electromagnetic property

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2095580A (en) * 1934-06-01 1937-10-12 American Sheet & Tin Plate Steel strip and its production
US2271242A (en) * 1940-05-23 1942-01-27 Great Lakes Steel Corp Method of making nonaging steel
US2360868A (en) * 1943-01-02 1944-10-24 Carnegie Illinois Steel Corp Manufacture of nonaging steel
US2378548A (en) * 1944-01-11 1945-06-19 Bethlehem Steel Corp Ferrous alloys containing bismuth
US2999749A (en) * 1958-09-17 1961-09-12 Union Carbide Corp Method for producing non-aging rimmed steels
US3102831A (en) * 1960-08-10 1963-09-03 Molybdenum Corp Production of columbium containing steels
US3105780A (en) * 1960-09-19 1963-10-01 Gen Electric Method of decarburizing ferrous materials

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2095580A (en) * 1934-06-01 1937-10-12 American Sheet & Tin Plate Steel strip and its production
US2271242A (en) * 1940-05-23 1942-01-27 Great Lakes Steel Corp Method of making nonaging steel
US2360868A (en) * 1943-01-02 1944-10-24 Carnegie Illinois Steel Corp Manufacture of nonaging steel
US2378548A (en) * 1944-01-11 1945-06-19 Bethlehem Steel Corp Ferrous alloys containing bismuth
US2999749A (en) * 1958-09-17 1961-09-12 Union Carbide Corp Method for producing non-aging rimmed steels
US3102831A (en) * 1960-08-10 1963-09-03 Molybdenum Corp Production of columbium containing steels
US3105780A (en) * 1960-09-19 1963-10-01 Gen Electric Method of decarburizing ferrous materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404047A (en) * 1965-12-20 1968-10-01 United States Steel Corp Method for producing deep-drawing low-carbon steel sheet
US3865645A (en) * 1971-12-27 1975-02-11 Nippon Steel Corp Cold-rolled steel sheet for press-forming

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US3239388A (en) 1966-03-08
GB1055185A (en) 1967-01-18
LU44042A1 (en, 2012) 1963-09-10

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