US3716420A - Hot rolled steel sheets for extra deep drawing - Google Patents

Hot rolled steel sheets for extra deep drawing Download PDF

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Publication number
US3716420A
US3716420A US00196697A US3716420DA US3716420A US 3716420 A US3716420 A US 3716420A US 00196697 A US00196697 A US 00196697A US 3716420D A US3716420D A US 3716420DA US 3716420 A US3716420 A US 3716420A
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United States
Prior art keywords
hot rolled
steel sheets
rolled steel
steel
sheets
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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
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US00196697A
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English (en)
Inventor
K Matsudo
Y Ikegami
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JFE Engineering Corp
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Nippon Kokan Ltd
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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
    • C21D8/0421—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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • a hot rolled steel sheet having extra deep drawing and press formability propertes comparable to cold rolled steel sheets, wherein the steel is vacuum degassed and has a composition consisting essentially of: 0.0010.020% carbon, less than 0.10% slicon, 0.100.60% manganese, less than 0.020% sulphur, 0.010-0.10% aluminum, 0.02- 20 0.08% titanium, balance iron and incidental impnrities and wherein Ti/C 4 and T/S 2.
  • the steel sheets are hot rolled with a finishing temperature in the range 800- 950 C. and coiled at a temperature in the range 650 C.- 700 C.
  • This invention relates to steel sheets and in particular to hot rolled steel sheets having a relatively 10W tensile strength and excellent press forrnability.
  • a steel consisting essentially of 0.001-0.020% carbon, less than 0.10% silicon, 0.100.60% manganese, less than 0.020% sulphur, 0.010-0.10% aluminum, 0.02- 0.08% titanium, balance iron and incidental impurities, provided always that Ti/C 4 and Ti/S 2.
  • the steel of the present invent is hot rolled at a finishing temperature between 800- 950 C. and coiled at a temperature between 650- 700 C.
  • Silicon is another element which increases the tensile strength of steel sheets and therefore this element is restrcted to amounts below 0.1%.
  • Manganese in an amount in excess of 0.1% is added in order to prevent hot shortness caused by sulphur.
  • the upper limit of manganese must, however, be controlled to EXAMPLE 1
  • Table 2 indicates the chemical composition of steels covered by this invention and Table 3 indicates the manufacturing conditions and mechanical properties upon hot rolling of such steels.
  • the Ti added to hot rolled steel sheets achieve excellent press formability. It has been found that the Ti content must satisfy the ratio Ti/S Z in order to achieve the above noted conditions. In addition, the ratio Ti/C 4 further serves to improve the press formability of the hot rolled steel sheets provided the condition of T/S 2 is also met. For the above reasons, the Ti content is fixed at 0.020.08% hearing in mind its further balance with the carbon and sulphur contents.
  • Aluminum is added. in an amount of 0.010%0.10% in order to facilitate deoxidation and eiect a better Ti yield. Amounts in excess of 0.10% are detrimental to the press formability of the steel sheets, and an amount less than 0.010% lessens the effect of deoxidation.
  • finishing temperature of the rolling is above the Ar transforrnaton temperature, because the press formability rapdly deteriorates below the Ar temperature.
  • the Ar transformation temperature is in the vicinity of 850 C. in the case of sheets of extremely low carbon content and t is difficult to maintain a finishing temperature as high as 850 C. in very thin sheets.
  • the elect of a finishng temperature below the Ar transformation temperature is, at least in part, olset by careful control of the steel composition within the ranges previously discussed.
  • the steels of the present invention range frorn 1.0 to 7.0 mm. thick, the range of finishing temperatures may be between 800 C. and 950 C. In operations, it is desirable to maintain a finishing temperature as high as pos sible above the Ar transformation temperature.
  • the coilng temperature can be less than 650 C. and still provicle an acceptable press formabilty.
  • steels manufactured in accordance with this invention have low tensile strength and excellent press formability.
  • FIG. 1 shows the relation between the notch elongation percentage and the tensile strength respcctively of the products of the present invention and the prior art.
  • FIG. 2 is a microphotograph (100 magnifications) of the structure of a steel plate manufactured by the method of this invention and
  • FIG. 3 is a microphotograph (500 magnifications) of the structure of inclusions.
  • FIG. 1 Differences in notch elongation between steels of this invention and other hot rolled steel sheets for drawing of the same thickness are shown in FIG. 1. It is obvious therefrorn that the press formability of the steel sheets of this invention is far superior to those of the conventional hot rolled steel sheets for drawing, an approach is that of cold rolled steel sheets.
  • FIG. 2 the microphotograph of the ferrte structure of a steel sheet according to this invention shows an ideal formation.
  • FIG. 3 shows that Al O and MnS are closely attached to TN+TS. This gain shows that excellent characteristics may be achieved by products of the present invention.
  • a vacuum degassed steel hot rolled nto sheets for extra deep drawing said steel consisting essentially of: 0.001-0.020% carbon, less than 0.10% silicon, 0.10 0.60% manganese, less than 0.020% sulphur, 0.010- 0.10% aluminum, 0.02 0.08% titanium, balance iron and incidental impurties and whercin Ti/C 4 and Ti/S 2.
  • a steel sheet as claimed in claim 1 wherein said sheet is hot rolled with a finishing temperature within the range of 800-950 C. and coiled at a temperature in the range of 650-700 C. whereby press formability properties are enhanced.
  • a process for producing steel sheets for extra deep Reference5 Cted drawing comprislng vacuum degassing a steel havng a UNITED STATES PATENTS composrtron c0nsrst1ng essentrally of 0.0010.020% carbon, less than 0.10% silicon, 0.100.60% manganese, less 3522110 7/1970 shlmlzu et 14812 than 0.020% sulphur, 0.010-0.10% alumnum, 0.02 3560270 2/1971 Rembold et 14812 5 3,67456 9/1971 Forand, Jr.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
US00196697A 1970-12-19 1971-11-08 Hot rolled steel sheets for extra deep drawing Expired - Lifetime US3716420A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45113660A JPS5241209B1 (pt) 1970-12-19 1970-12-19

Publications (1)

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US3716420A true US3716420A (en) 1973-02-13

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US00196697A Expired - Lifetime US3716420A (en) 1970-12-19 1971-11-08 Hot rolled steel sheets for extra deep drawing

Country Status (8)

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US (1) US3716420A (pt)
JP (1) JPS5241209B1 (pt)
AU (1) AU451296B2 (pt)
CA (1) CA939937A (pt)
DE (1) DE2155620B2 (pt)
FR (1) FR2117866B1 (pt)
GB (1) GB1333280A (pt)
IT (1) IT940594B (pt)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001052A (en) * 1971-09-30 1977-01-04 Kawasaki Steel Corporation Hot-rolled low-carbon steel strip with an excellent press-workability capable of forming smooth pressed surface and a method of making the same
US4026729A (en) * 1974-12-05 1977-05-31 Nippon Kokan Kabushiki Kaisha Method of making a soft steel sheet by continuous annealing
US4046597A (en) * 1976-12-09 1977-09-06 Nippon Steel Corporation Vibration damping steel material and process for producing the same
US4144379A (en) * 1977-09-02 1979-03-13 Inland Steel Company Drawing quality hot-dip coated steel strip
US4576656A (en) * 1982-10-08 1986-03-18 Kawasaki Steel Corporation Method of producing cold rolled steel sheets for deep drawing

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55152125A (en) * 1979-02-23 1980-11-27 Torrington Co Bearing cup and production thereof
CA1259827A (en) * 1984-07-17 1989-09-26 Mitsumasa Kurosawa Cold-rolled steel sheets and a method of manufacturing the same
DE3803064C2 (de) * 1988-01-29 1995-04-20 Preussag Stahl Ag Kaltgewalztes Blech oder Band und Verfahren zu seiner Herstellung
CA1331852C (en) * 1988-02-09 1994-09-06 Nobuhiko Sakai Process for preparing alloyed-zinc-plated titanium-killed steel sheet having excellent deep-drawability
ATE126276T1 (de) * 1989-05-09 1995-08-15 Preussag Stahl Ag Verfahren zur herstellung von coilbreak-freiem warmband und alterungsbeständigem feuerverzinktem kaltband.
DE19547181C1 (de) * 1995-12-16 1996-10-10 Krupp Ag Hoesch Krupp Verfahren zur Herstellung eines kaltgewalzten, höherfesten Bandstahles mit guter Umformbarkeit bei isotropen Eigenschaften
FR2742769B1 (fr) * 1995-12-20 1998-01-16 Lorraine Laminage Acier lamine a froid presentant une bonne aptitude au soudage et au brasage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001052A (en) * 1971-09-30 1977-01-04 Kawasaki Steel Corporation Hot-rolled low-carbon steel strip with an excellent press-workability capable of forming smooth pressed surface and a method of making the same
US4026729A (en) * 1974-12-05 1977-05-31 Nippon Kokan Kabushiki Kaisha Method of making a soft steel sheet by continuous annealing
US4046597A (en) * 1976-12-09 1977-09-06 Nippon Steel Corporation Vibration damping steel material and process for producing the same
US4144379A (en) * 1977-09-02 1979-03-13 Inland Steel Company Drawing quality hot-dip coated steel strip
US4576656A (en) * 1982-10-08 1986-03-18 Kawasaki Steel Corporation Method of producing cold rolled steel sheets for deep drawing

Also Published As

Publication number Publication date
AU451296B2 (en) 1974-08-01
AU3655571A (en) 1973-06-14
IT940594B (it) 1973-02-20
CA939937A (en) 1974-01-15
DE2155620B2 (de) 1974-05-16
GB1333280A (en) 1973-10-10
DE2155620A1 (de) 1972-07-06
FR2117866B1 (pt) 1974-03-29
JPS5241209B1 (pt) 1977-10-17
FR2117866A1 (pt) 1972-07-28

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