JPS6479345A - High-strength hot rolled steel plate excellent in workability and its production - Google Patents

High-strength hot rolled steel plate excellent in workability and its production

Info

Publication number
JPS6479345A
JPS6479345A JP63044527A JP4452788A JPS6479345A JP S6479345 A JPS6479345 A JP S6479345A JP 63044527 A JP63044527 A JP 63044527A JP 4452788 A JP4452788 A JP 4452788A JP S6479345 A JPS6479345 A JP S6479345A
Authority
JP
Japan
Prior art keywords
temp
steel plate
steel
cooling
workability
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
JP63044527A
Other languages
Japanese (ja)
Other versions
JPH0567682B2 (en
Inventor
Osamu Kono
Manabu Takahashi
Junichi Wakita
Kazuaki Ezaka
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Steel Corp filed Critical Nippon Steel Corp
Priority to JP63044527A priority Critical patent/JPS6479345A/en
Priority to EP88108798A priority patent/EP0295500B2/en
Priority to DE3851371T priority patent/DE3851371T3/en
Publication of JPS6479345A publication Critical patent/JPS6479345A/en
Priority to US07/442,445 priority patent/US5017248A/en
Priority to US07/573,056 priority patent/US5030298A/en
Priority to JP10765291A priority patent/JPH04228517A/en
Publication of JPH0567682B2 publication Critical patent/JPH0567682B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To manufacture a high-strength hot-rolled steel plate having high ductility and excellent in workability, by subjecting a steel containing specific percentages of C, Si, and Mn to hot finish rolling under specific conditions, to cooling, and then to winding. CONSTITUTION:A steel having a composition consisting of, by weight, 0.15-0.4% C, 0.5-2.0% Si, 0.5-2.0% Mn, and the balance iron with inevitable impurities is subjected to hot finish rolling at >=80% total draft, and the reduction-end temp. is regulated to Ar3+ or -30 deg.C. Subsequently, cooling is applied at <40 deg.C/sec cooling rate down to an arbitrary temp. T within the temp. range from the lower temp. between the Ar3 point of this steel and the above rolling-end temp. to the Ar3 point and further cooling is continued at >=40 deg.C/sec cooling rate, followed by winding at 350-500 deg.C. By this method, the steel plate constituted of a structure in which the ratio of the space factor of polygonal ferrite VPF(%) to the average grain size of polygonal ferrite dPF(mu), VPF/dPF, is regulated to >=7 and residual austenite is contained >=5% by volume ratio and which is composed of ferrite, bainite, and residual austenite can be obtained.
JP63044527A 1987-06-03 1988-02-29 High-strength hot rolled steel plate excellent in workability and its production Granted JPS6479345A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP63044527A JPS6479345A (en) 1987-06-03 1988-02-29 High-strength hot rolled steel plate excellent in workability and its production
EP88108798A EP0295500B2 (en) 1987-06-03 1988-06-01 Hot rolled steel sheet with a high strength and a distinguished formability
DE3851371T DE3851371T3 (en) 1987-06-03 1988-06-01 Hot-rolled, high-strength steel sheet with excellent formability.
US07/442,445 US5017248A (en) 1987-06-03 1989-11-27 Hot rolled steel sheet with high strength and distinguished formability
US07/573,056 US5030298A (en) 1987-06-03 1990-08-23 Process for producing a hot rolled steel sheet with high strength and distinguished formability
JP10765291A JPH04228517A (en) 1988-02-29 1991-05-13 Manufacture of hot rolled high strength steel sheet excellent in workability

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP13806087 1987-06-03
JP63044527A JPS6479345A (en) 1987-06-03 1988-02-29 High-strength hot rolled steel plate excellent in workability and its production

Related Child Applications (2)

Application Number Title Priority Date Filing Date
JP10765291A Division JPH04228517A (en) 1988-02-29 1991-05-13 Manufacture of hot rolled high strength steel sheet excellent in workability
JP10765191A Division JPH04228538A (en) 1991-05-13 1991-05-13 Hot rolled high strength steel sheet excellent in workability

Publications (2)

Publication Number Publication Date
JPS6479345A true JPS6479345A (en) 1989-03-24
JPH0567682B2 JPH0567682B2 (en) 1993-09-27

Family

ID=15213040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63044527A Granted JPS6479345A (en) 1987-06-03 1988-02-29 High-strength hot rolled steel plate excellent in workability and its production

Country Status (1)

Country Link
JP (1) JPS6479345A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02305925A (en) * 1989-05-20 1990-12-19 Kobe Steel Ltd Production of high-strength hot rolled steel sheet having excellent ductility
JPH03180445A (en) * 1989-12-09 1991-08-06 Nippon Steel Corp Hot rolled high strength steel sheet excellent in workability and spot weldability and its manufacture
JPH05171345A (en) * 1991-05-30 1993-07-09 Nippon Steel Corp High yield ratio type hot rolled high strength steel plate excellent in formability and spot weldability and its production and high yield ratio type hot rolled high strength steel plate excellent in formability and its production
JPH11100640A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp High strength hot rolled steel sheet having high dynamic deformation resistance and its production
JPH11100636A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp Good workability and high strength cold rolled steel sheet having high dynamic deformation resistance and its production
JPH11100639A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp Good workability and high strength hot rolled steel sheet having high dynamic deformation resistance and its production
JPH11100635A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp High strength cold rolled steel sheet having high dynamic deformation resistance and its production
US6517955B1 (en) 1999-02-22 2003-02-11 Nippon Steel Corporation High strength galvanized steel plate excellent in adhesion of plated metal and formability in press working and high strength alloy galvanized steel plate and method for production thereof
US6562152B2 (en) 2000-06-29 2003-05-13 Nippon Steel Corporation High strength steel plate having improved workability and plating adhesion and process for producing the same
US7736449B2 (en) 2003-01-15 2010-06-15 Nippon Steel Corporation High-strength hot-dip galvanized steel sheet and method for producing the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4692018B2 (en) * 2004-03-22 2011-06-01 Ｊｆｅスチール株式会社 High-tensile hot-rolled steel sheet with excellent strength-ductility balance and method for producing the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55145121A (en) * 1979-04-28 1980-11-12 Nisshin Steel Co Ltd Manufacture of high strength hoop having composite structure
JPS59126719A (en) * 1983-01-11 1984-07-21 Nippon Steel Corp Production of high tension hot rolled steel sheet having excellent processability
JPS6043430A (en) * 1983-08-15 1985-03-08 Nippon Kokan Kk <Nkk> Production of composite structure steel sheet having high strength and high workability
JPS6043425A (en) * 1983-08-15 1985-03-08 Nippon Kokan Kk <Nkk> Production of hot rolled composite structure steel sheet having high strength and high workability
JPS60181231A (en) * 1984-02-29 1985-09-14 Nippon Steel Corp Manufacture of high-tension hot-rolled steel sheet having superior workability

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55145121A (en) * 1979-04-28 1980-11-12 Nisshin Steel Co Ltd Manufacture of high strength hoop having composite structure
JPS59126719A (en) * 1983-01-11 1984-07-21 Nippon Steel Corp Production of high tension hot rolled steel sheet having excellent processability
JPS6043430A (en) * 1983-08-15 1985-03-08 Nippon Kokan Kk <Nkk> Production of composite structure steel sheet having high strength and high workability
JPS6043425A (en) * 1983-08-15 1985-03-08 Nippon Kokan Kk <Nkk> Production of hot rolled composite structure steel sheet having high strength and high workability
JPS60181231A (en) * 1984-02-29 1985-09-14 Nippon Steel Corp Manufacture of high-tension hot-rolled steel sheet having superior workability

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02305925A (en) * 1989-05-20 1990-12-19 Kobe Steel Ltd Production of high-strength hot rolled steel sheet having excellent ductility
JPH03180445A (en) * 1989-12-09 1991-08-06 Nippon Steel Corp Hot rolled high strength steel sheet excellent in workability and spot weldability and its manufacture
JPH05171345A (en) * 1991-05-30 1993-07-09 Nippon Steel Corp High yield ratio type hot rolled high strength steel plate excellent in formability and spot weldability and its production and high yield ratio type hot rolled high strength steel plate excellent in formability and its production
JPH11100640A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp High strength hot rolled steel sheet having high dynamic deformation resistance and its production
JPH11100636A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp Good workability and high strength cold rolled steel sheet having high dynamic deformation resistance and its production
JPH11100639A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp Good workability and high strength hot rolled steel sheet having high dynamic deformation resistance and its production
JPH11100635A (en) * 1997-09-24 1999-04-13 Nippon Steel Corp High strength cold rolled steel sheet having high dynamic deformation resistance and its production
US6517955B1 (en) 1999-02-22 2003-02-11 Nippon Steel Corporation High strength galvanized steel plate excellent in adhesion of plated metal and formability in press working and high strength alloy galvanized steel plate and method for production thereof
US6562152B2 (en) 2000-06-29 2003-05-13 Nippon Steel Corporation High strength steel plate having improved workability and plating adhesion and process for producing the same
US7736449B2 (en) 2003-01-15 2010-06-15 Nippon Steel Corporation High-strength hot-dip galvanized steel sheet and method for producing the same

Also Published As

Publication number Publication date
JPH0567682B2 (en) 1993-09-27

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