US3239388A - Cold rolled rimmed steel sheet and strip having preferred orientation adapted for press forming and production of the same - Google Patents

Cold rolled rimmed steel sheet and strip having preferred orientation adapted for press forming and production of the same Download PDF

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Publication number
US3239388A
US3239388A US286994A US28699463A US3239388A US 3239388 A US3239388 A US 3239388A US 286994 A US286994 A US 286994A US 28699463 A US28699463 A US 28699463A US 3239388 A US3239388 A US 3239388A
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United States
Prior art keywords
steel sheet
steel
strip
cold rolled
rimmed
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Expired - Lifetime
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US286994A
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English (en)
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Sasaki Kenji
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JFE Steel Corp
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Kawasaki Steel Corp
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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 a steel sheet or strip to precipitate aluminum nitride, whereby an elongated grain structure is formed in it.
  • the aluminum stabilized steel sheet or strip has a superior deep drawing property, it has heretofore been attributed to the fact that the elongated grain structure has caused the deformation resistance in a thickness direction to be greater than the deformation resistance in a plane so that the thinning in thickness has been reduced.
  • 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 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 and the converter in either a steel making or ingot casting step to obtain rimmed steel ingots containing one or more of said elements singly or combined in a total amount of 0.003-0.100% 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 500750 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 than 0.020% and its nitrogen content 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 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 sufiiciently 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 efiected even in the atmosphere containing a high nitrogen content.
  • 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 bismuth to the thus obtained molten steel, and producing a rimmed steel ingot containing 0.060% carbon and 0.015% bismuth.
  • 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 properties: R 1.65, Er. 11.20 mm., C.C.V. 35.70 mm., TS. 293 kg./mm. and El. 50%
  • the chemical analysis and mechanical properties of the present steel sheet are listed as No. 6 data in Table 1.
  • One of the features of this invention is to provide the formation of the preferred orientation favorable to the deep drawing process by the steps of adding a minor amount of one or more of antimony, bismuth and niobium to the steel and subjecting the 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 less expensive than the aluminum stabilized steel or strip.
  • the steel sheet or strip of this invention is superior to any other steel sheet or strip in the deep drawing property.
  • Table 1 shows the plastic strain ratio (1?), the conical cup value (C.C.V.), various mechanical properties and the intensity of (111) plane difiraction peak by the X-ray inverse pole figure method, all
  • FIG. 1 A circular blank is rested horizontally in the conical die, and drawn with the appropriate punchuntil the bottom of the cup fractures.
  • Table 3 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.
  • FIG. 1 shows a sectional view of the arrangement of tools for the conical cup test.
  • FIG. 2 shows a perspective view of a shape of fractured cup as the result of test.
  • FIG. 3. shows a perspective view of another shape of fractured cup.
  • FIG. 4 shows a perspective view of a shape of a completely drawn cupwith no fracture.
  • the conical cup value (C.C.V.) is represented by the numerical value, mm., of the average diameter of the rim of the conical cup when fracture occurs as shown in FIGS; 2'3.
  • 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 through 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 sheet of .I IS this invention 13 26.40 or less 13 26.40 or less 17 37.30 or less 17 37.42 or less 21 44.82 or less 21 45.12 or less log W /W
  • W width of tensile test specimen before tension
  • E value the lessthinning in the thickness direction in the plastic deformation, and the more the deformation in the width direction.
  • the crystallo-' graphic orientation of the rimmed steel sheet of this invention containing a small amount. of antimony, bismuth v and niobium is different from that-of the knownrirnmedsteel sheet which has been decarburized and denitrided.
  • the Xray itensity of (111.) plane difiraction peak of the known rimmed steel is small while that of the steel sheet produced from the known rimmed steel which has been subjected to thedecarburizing and denitriding annealing is also relatively small.
  • the accumulation of the main crystallographic. orientation (111) plane of the present decarburizcd and idenitrided rimmed steel sheet containing antimony, bismuth and nio-. bium is stronger.
  • the intensityof (111) planeydiftraction peak of the aluminum stabilized steel isstronger than-that of the known rimmed steel, but weaker than that of :the present steel sheet.
  • Table 2 shows the results of various practical press forming tests conducted on various steel sheet. In each press forming. test shown'inrTable 2, the stretch formability refers to theileft' side while the: deep drawability to the right more emphatically than the other,'respectively.
  • the decarburized and denitrided rimmed steel sheet or strip containing antimony, bismuth and niobium of the present invention has not only the excellent deep drawing property but also the good stretch formability. It will be appreciated, therefore, that this steel sheet or strip is well suited for all type of press forming.
  • the aging velocity of the present steel sheet is considerably slower than that of the commercial rimmed steel sheet of prior art, and if the carbon and nitrogen content can be reduced by the decarlburizing and denitriding annealing, the present steel will be given the non-aging property.
  • the steel sheet or strip of the invention will have an adequate nonaging quality if the elements, carbon, nitrogen, 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 at least one element selected from the group consisting of antimony, bismuth and niobium to molten steel to produce a rimmed steel containing 0.0030.100% by weight of said additive, making a cold rolled rimmed steel sheet or strip by 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 thickness selected from the range of 0.5 to 1.6 mm. comprising the steps of adding at least one element selected from the group consisting of antimony, bismuth and niobium to molten steel to produce a rimmed steel containing 0.003-0.100% by Weight of said additive, making a cold rolled rimmed steel sheet or strip by 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 at least one element selected from the group consisting of antimony, bismuth and niobium to molten steel to produce a rimmed steel containing 0.003-0.100% by weight of said additive, making a cold rolled rimmed steel sheet or strip by 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 thickness selected from the range of 0.5 to 1.6 mm. comprising the steps of adding at least one element selected from the group consisting of antimony, bismuth and niobium to molten steel to produce a rimmed steel containing 0.003 0.100% by weight of said additive, making a cold rolled rimmed steel sheet or strip by 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 or strip having good drawability and stretchability said steel consisting essentially of at least one element selected from the group consisting of antimony, bismuth and niobium, the total element percentage being 0.0030.100% by weight, less than 0.020% carbon, OAS-0.60% manganese, and the balance iron and incidental impurities.

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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)
US286994A 1962-07-11 1963-06-11 Cold rolled rimmed steel sheet and strip having preferred orientation adapted for press forming and production of the same Expired - Lifetime US3239388A (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 (enrdf_load_stackoverflow)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335036A (en) * 1964-01-25 1967-08-08 Kawasaki Steel Co Deep drawing steel sheet and method for producing the same
US3404047A (en) * 1965-12-20 1968-10-01 United States Steel Corp Method for producing deep-drawing low-carbon steel sheet
US4204890A (en) * 1977-11-11 1980-05-27 Kawasaki Steel Corporation Method of producing non-oriented silicon steel sheets having an excellent electromagnetic property

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322052B2 (enrdf_load_stackoverflow) * 1971-12-27 1978-07-06

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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335036A (en) * 1964-01-25 1967-08-08 Kawasaki Steel Co Deep drawing steel sheet and method for producing the same
US3404047A (en) * 1965-12-20 1968-10-01 United States Steel Corp Method for producing deep-drawing low-carbon steel sheet
US4204890A (en) * 1977-11-11 1980-05-27 Kawasaki Steel Corporation Method of producing non-oriented silicon steel sheets having an excellent electromagnetic property

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LU44042A1 (enrdf_load_stackoverflow) 1963-09-10
US3239389A (en) 1966-03-08
GB1055185A (en) 1967-01-18

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