EP0228756A1 - Tôles en acier à très basse teneur en carbone - Google Patents

Tôles en acier à très basse teneur en carbone Download PDF

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Publication number
EP0228756A1
EP0228756A1 EP86300108A EP86300108A EP0228756A1 EP 0228756 A1 EP0228756 A1 EP 0228756A1 EP 86300108 A EP86300108 A EP 86300108A EP 86300108 A EP86300108 A EP 86300108A EP 0228756 A1 EP0228756 A1 EP 0228756A1
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EP
European Patent Office
Prior art keywords
amount
phosphatability
steel sheet
steel
low carbon
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.)
Granted
Application number
EP86300108A
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German (de)
English (en)
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EP0228756B1 (fr
Inventor
Osamu Hashimoto
Kei Sakata
Chikako Ishii
Minari Gotoh
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 Steel Corp
Original Assignee
Kawasaki Steel Corp
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Publication date
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Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to DE8686300108T priority Critical patent/DE3671250D1/de
Publication of EP0228756A1 publication Critical patent/EP0228756A1/fr
Application granted granted Critical
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    • 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
    • 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

Definitions

  • This invention relates to extra low carbon steel sheets having good chemical conversion characteristics, and more particularly to an improvement of the phosphatability in carbonitride-containing extra low carbon steel sheets.
  • Extra low carbon steel sheets containing Ti have excellent properties such as low yield point, high ductility and the like in view of their mechanical properties (please refer to Japanese Patent Application Publication No. 44-18,066).
  • the above steel sheet as, for example, an outer panel for automotive vehicles, there is caused a problem that the phosphatability is are poor, so that the use application is considerably restricted.
  • an extra low carbon steel sheet having a good phosphatability which comprises not more than 0.01 wt% of carbon, not more than 0.01 wt% of nitrogen, not more than 0.15 wt% of silicon, not more than 0.6 wt% of manganese, not more than 0.10 wt% of aluminum, titanium being not less than 4.0'([C]+[N]), niobium being within a range of 1/6 ⁇ [ Ti ] to 31/4 ⁇ [C] , and the balance being iron and inevitable impurities.
  • the invention is based on the phenomenon found during the investigation on the mechanical properties and phosphatability of Nb and/or Ti-containing steel.
  • the phosphatability was estimated by pin hole area ratio (hereinafter abbreviated as PHE) when the steel sheet was degreased, rinsed with water, phosphated and subjected to a pin hole test as mentioned later.
  • PHE pin hole area ratio
  • Ti preferentially bonds to S, N and C in the steel to form precipitates, and at the same time concentrates in the surface of the steel to form an oxide film degrading the phosphatability as previously mentioned. Therefore, when the amount of Ti added is sufficiently small, there is no problem on the phosphatability apart from the mechanical properties, but the phosphatability is degraded as the Ti amount increases. According to the invention, it is necessary that the amount of Ti added is not less than 4 times of the total amount of C and N in order to provide non-aging steel sheets.
  • the phosphatability is largely improved as the amount of Nb added increases. Because, it is guessed that the surface concentration of Ti is first suppressed with the increase of the Nb amount, so that Ti can not completely fix carbon unless a sufficiently excessive amount of Ti is added to amounts of C, N and S in the steel and hence Nb reacts with C to form NbC series precipitates on the surface of the steel sheet, which provide nuclei for phosphate crystal.
  • solute carbon when the amount of solute carbon is not more than 0.005%, even if such solute carbon is existent in the steel, it is included in the crystal grain boundary to provide a complete non-aging steel sheet.
  • the Nb amount when the Nb amount is excessive to the C amount, the phosphatability is degraded. Therefore, the Nb amount must be limited to not more than 31/4 times the C amount.
  • the reason why the amounts of C and N are limited to not more than 0.01%, respectively, is due to the fact that the press formability is sufficiently ensured as the mechanical properties of the steel.
  • the amounts of Mn and Si are limited to not more than 0.6% and not more than 0.15%, respectively.
  • A£ is accepted to be not more than 0.1% as the deoxidizer in the steel making.
  • the inevitable impurities are P and S, which are accepted to be not more than 0.15% and 0.02%, respectively, according to the invention.
  • the steel sheet according to the invention is manufactured by subjecting a steel of a particular chemical composition to continuous casting, hot rolling, cold rolling and annealing in the usual manner.
  • Each of cold rolled steel sheets having a chemical composition as shown in the following Table 2 was manufactured through box annealing or continuous annealing.
  • the phosphatability (PHE) and mechanical properties (AI, aging index, kg/mm 2 ) were measured with respect to the resulting steel sheets to obtain results as shown in the following Table 3. Moreover, the phosphatic treatment was carried out with BT 3112 made by Japan Perkerizing K.K., adjusting to total acidity of 14.3 and free acidity of 0.5 at 55°C and then spraying to the surface of the steel sheet for 120 seconds. The phosphatability was evaluated by PHE as previously mentioned.
  • the phosphatability is degraded with the increase of Ti amount, but it is improved by adding Nb in an amount of not less than 1/6 of the Ti amount.
  • Nb amount is less than 1/6 of Ti amount (Steel sheet No. 6) or more than 31/4 of C amount (Steel sheet No. 7)
  • PHE exceeds 3
  • the phosphatability is degraded.
  • the remarkable improvement of phosphatability can be realized without causing the deterioration of excellent properties as the material of Ti-containing extra low carbon steel sheets.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP86300108A 1984-07-17 1986-01-08 Tôles en acier à très basse teneur en carbone Expired - Lifetime EP0228756B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8686300108T DE3671250D1 (de) 1986-01-08 1986-01-08 Stahlbleche mit sehr niedrigem kohlenstoffgehalt.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14698984A JPS6126756A (ja) 1984-07-17 1984-07-17 良化成処理性を有する極低炭素鋼板

Publications (2)

Publication Number Publication Date
EP0228756A1 true EP0228756A1 (fr) 1987-07-15
EP0228756B1 EP0228756B1 (fr) 1990-05-16

Family

ID=15420093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86300108A Expired - Lifetime EP0228756B1 (fr) 1984-07-17 1986-01-08 Tôles en acier à très basse teneur en carbone

Country Status (2)

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EP (1) EP0228756B1 (fr)
JP (1) JPS6126756A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0295697A2 (fr) * 1987-06-18 1988-12-21 Kawasaki Steel Corporation Feuillards en acier laminé à froid, présentant une aptitude au soudage par points et procédé pour leur fabrication
EP0572666A1 (fr) * 1991-02-20 1993-12-08 Nippon Steel Corporation Tole d'acier laminee a froid et tole d'acier galvanisee presentant une bonne aptitude au formage et a la trempe au four, et sa production
EP0578221A1 (fr) * 1992-07-08 1994-01-12 Nkk Corporation Rôle d'acier, résistant à la formation de soufflures et procédé pour sa fabrication
EP0662523A1 (fr) * 1993-07-28 1995-07-12 Nippon Steel Corporation Tole d'acier pour boites de conserve a resistance elevee a la fissuration par corrosion sous contraintes, et son procede de fabrication
EP0691415A4 (fr) * 1991-03-15 1995-10-12 Nippon Steel Corp Tole d'acier laminee a froid, a haute resistance et presentant une excellente aptitude au formage, tole d'acier laminee a froid, a haute resistance et zinguee a chaud, et procede de fabrication desdites toles
EP0747496A1 (fr) * 1995-06-08 1996-12-11 Sollac S.A. TÔle d'acier laminée à chaud à haute résistance et haute emboutissabilité renfermant du titane, et ses procédés de fabrication
EP0747495A1 (fr) * 1995-06-08 1996-12-11 Sollac S.A. TÔle d'acier laminée à chaud à haute résistance et haute emboutissabilité refermant du niobium, et ses procédés de fabrication
EP0780482A1 (fr) * 1995-12-20 1997-06-25 Sollac S.A. Acier laminé à froid présentant une bonne aptitude au soudage et au brasage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0617518B2 (ja) * 1986-03-07 1994-03-09 住友金属工業株式会社 異方性、化成処理性に優れた冷延板の製造法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765874A (en) * 1972-05-19 1973-10-16 Armco Steel Corp Vacuum degassed, interstitial-free, low carbon steel and method for producing same
DE2362658A1 (de) * 1972-12-23 1974-07-18 Nippon Steel Corp Stahlblech mit hervorragender pressverformbarkeit und verfahren zu dessen herstellung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852441A (ja) * 1981-09-22 1983-03-28 Sumitomo Metal Ind Ltd プレス成形性の良好な高強度冷延鋼板の製造法
JPS58107414A (ja) * 1981-12-22 1983-06-27 Nippon Steel Corp 超深絞り用鋼板の製造方法
JPS5931827A (ja) * 1982-08-13 1984-02-21 Nippon Steel Corp 超深絞り用焼付硬化性鋼板の製造方法
JPS5974231A (ja) * 1982-10-20 1984-04-26 Nippon Steel Corp 超深絞性溶融亜鉛メツキ鋼板の製造法
JPS5976826A (ja) * 1982-10-22 1984-05-02 Nippon Steel Corp 超深絞用冷延鋼板の製造方法
CA1259827A (fr) * 1984-07-17 1989-09-26 Mitsumasa Kurosawa Toles d'acier laminees a froid, et methode de fabrication connexe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765874A (en) * 1972-05-19 1973-10-16 Armco Steel Corp Vacuum degassed, interstitial-free, low carbon steel and method for producing same
DE2362658A1 (de) * 1972-12-23 1974-07-18 Nippon Steel Corp Stahlblech mit hervorragender pressverformbarkeit und verfahren zu dessen herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JAPANESE PATENT ABSTRACTS, vol. J6-M, Week 8612, page 17, no. JP 86 078 320 A (KAWASAKI STEEL K.K.) 06-02-1986 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0295697A3 (en) * 1987-06-18 1989-11-23 Kawasaki Steel Corporation Cold rolled steel sheets having improved spot weldability and method for producing the same
US5089068A (en) * 1987-06-18 1992-02-18 Kawasaki Steel Corporation Cold rolled steel sheets having improved spot weldability
EP0295697A2 (fr) * 1987-06-18 1988-12-21 Kawasaki Steel Corporation Feuillards en acier laminé à froid, présentant une aptitude au soudage par points et procédé pour leur fabrication
EP0572666A1 (fr) * 1991-02-20 1993-12-08 Nippon Steel Corporation Tole d'acier laminee a froid et tole d'acier galvanisee presentant une bonne aptitude au formage et a la trempe au four, et sa production
EP0572666A4 (en) * 1991-02-20 1994-06-01 Nippon Steel Corp Cold-rolled steel sheet and galvanized cold-rolled steel sheet which are excellent in formability and baking hardenability, and production thereof
EP0691415A4 (fr) * 1991-03-15 1995-10-12 Nippon Steel Corp Tole d'acier laminee a froid, a haute resistance et presentant une excellente aptitude au formage, tole d'acier laminee a froid, a haute resistance et zinguee a chaud, et procede de fabrication desdites toles
EP0691415A1 (fr) * 1991-03-15 1996-01-10 Nippon Steel Corporation Tole d'acier laminee a froid, a haute resistance et presentant une excellente aptitude au formage, tole d'acier laminee a froid, a haute resistance et zinguee a chaud, et procede de fabrication desdites toles
EP0578221A1 (fr) * 1992-07-08 1994-01-12 Nkk Corporation Rôle d'acier, résistant à la formation de soufflures et procédé pour sa fabrication
US5356493A (en) * 1992-07-08 1994-10-18 Nkk Corporation Blister-resistant steel sheet and method for producing thereof
EP0662523A1 (fr) * 1993-07-28 1995-07-12 Nippon Steel Corporation Tole d'acier pour boites de conserve a resistance elevee a la fissuration par corrosion sous contraintes, et son procede de fabrication
EP0662523A4 (fr) * 1993-07-28 1995-12-13 Nippon Steel Corp Tole d'acier pour boites de conserve a resistance elevee a la fissuration par corrosion sous contraintes, et son procede de fabrication.
EP0747496A1 (fr) * 1995-06-08 1996-12-11 Sollac S.A. TÔle d'acier laminée à chaud à haute résistance et haute emboutissabilité renfermant du titane, et ses procédés de fabrication
EP0747495A1 (fr) * 1995-06-08 1996-12-11 Sollac S.A. TÔle d'acier laminée à chaud à haute résistance et haute emboutissabilité refermant du niobium, et ses procédés de fabrication
FR2735147A1 (fr) * 1995-06-08 1996-12-13 Lorraine Laminage Tole d'acier laminee a chaud a haute resistance et haute emboutissabilite renfermant du titane, et ses procedes de fabrication.
FR2735148A1 (fr) * 1995-06-08 1996-12-13 Lorraine Laminage Tole d'acier laminee a chaud a haute resistance et haute emboutissabilite renfermant du niobium, et ses procedes de fabrication.
US5759297A (en) * 1995-06-08 1998-06-02 Sollac Titanium-containing hot-rolled steel sheet with high strength and high drawability and its manufacturing processes
US5817196A (en) * 1995-06-08 1998-10-06 Sollac (Societe Anonyme) Niobium-containing hot-rolled steel sheet with high strength and high drawability and its manufacturing processes
EP0780482A1 (fr) * 1995-12-20 1997-06-25 Sollac S.A. Acier laminé à froid présentant une bonne aptitude au soudage et au brasage
FR2742769A1 (fr) * 1995-12-20 1997-06-27 Lorraine Laminage Acier lamine a froid presentant une bonne aptitude au soudage et au brasage

Also Published As

Publication number Publication date
JPS6126756A (ja) 1986-02-06
JPH0461063B2 (fr) 1992-09-29
EP0228756B1 (fr) 1990-05-16

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