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JPS6456821A - Production of high-toughness, high-fatigue strength, warm-forged, and non-heat treated steel - Google Patents

Production of high-toughness, high-fatigue strength, warm-forged, and non-heat treated steel

Info

Publication number
JPS6456821A
JPS6456821A JP21391387A JP21391387A JPS6456821A JP S6456821 A JPS6456821 A JP S6456821A JP 21391387 A JP21391387 A JP 21391387A JP 21391387 A JP21391387 A JP 21391387A JP S6456821 A JPS6456821 A JP S6456821A
Authority
JP
Japan
Prior art keywords
steel
forged
warm
toughness
fatigue strength
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.)
Pending
Application number
JP21391387A
Other languages
Japanese (ja)
Inventor
Masaaki Katsumata
Yutaka Kanatsuki
Motoo Sato
Osamu Matsumoto
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP21391387A priority Critical patent/JPS6456821A/en
Publication of JPS6456821A publication Critical patent/JPS6456821A/en
Pending legal-status Critical Current

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  • Heat Treatment Of Steel (AREA)

Abstract

PURPOSE:To produce the titled high-toughness, high-fatigue strength, warm- forged, and non-heattreated steel by warm-forging a fine-structured steel having a specified composition and contg. C, Si, Mn, Cr, Mo, Nb, Ti, and B as the essential components, and then directly cooling the steel. CONSTITUTION:A steel contg., by weight 0.04-0.20% C, 0.02-1.0% Si, 1.0-3.0% Mn, 0.5-3.0% Cr, 0.05-1.0% Mo, 0.01-0.2% Nb, 0.01-0.05% Ti, and 0.0003-0.005% B and further contg., as required, >=1 kind among <=3.0% Ni and/or <=0.15% S, <=0.30% Pb, <=0.01% Ca, <=0.30% Se, <=0.30% Te, and <=0.30% Bi is hot-rolled. By this method, a structure consisting essentially of proeutectoid ferrite and having >=6 grain size number or a structure consisting essentially of bainite and martensite and having >=6 former austenite grain size number is obtained. The steel is heated to AC3-1,100 deg.C, hot-forged, and then directly cooled to obtain a non-heattreated steel having a structure consisting essentially of martensite or bainite.
JP21391387A 1987-08-27 1987-08-27 Production of high-toughness, high-fatigue strength, warm-forged, and non-heat treated steel Pending JPS6456821A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21391387A JPS6456821A (en) 1987-08-27 1987-08-27 Production of high-toughness, high-fatigue strength, warm-forged, and non-heat treated steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21391387A JPS6456821A (en) 1987-08-27 1987-08-27 Production of high-toughness, high-fatigue strength, warm-forged, and non-heat treated steel

Publications (1)

Publication Number Publication Date
JPS6456821A true JPS6456821A (en) 1989-03-03

Family

ID=16647107

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21391387A Pending JPS6456821A (en) 1987-08-27 1987-08-27 Production of high-toughness, high-fatigue strength, warm-forged, and non-heat treated steel

Country Status (1)

Country Link
JP (1) JPS6456821A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129953A (en) * 1987-11-16 1989-05-23 Kobe Steel Ltd High strength non-heat treated steel and its manufacture
JP2003160833A (en) * 2001-11-22 2003-06-06 Kobe Steel Ltd Non-heat-treated thick steel plate with high toughness and high tension, and manufacturing method therefor
JP2006265583A (en) * 2005-03-22 2006-10-05 Sumitomo Metal Ind Ltd Hot-rolled steel sheet for hot pressing, manufacturing method thereof, and manufacturing method of hot-press formed member
JP2007100193A (en) * 2005-10-07 2007-04-19 Topy Ind Ltd Method for manufacturing roller shell in carrier at lower part of construction machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129953A (en) * 1987-11-16 1989-05-23 Kobe Steel Ltd High strength non-heat treated steel and its manufacture
JP2003160833A (en) * 2001-11-22 2003-06-06 Kobe Steel Ltd Non-heat-treated thick steel plate with high toughness and high tension, and manufacturing method therefor
JP2006265583A (en) * 2005-03-22 2006-10-05 Sumitomo Metal Ind Ltd Hot-rolled steel sheet for hot pressing, manufacturing method thereof, and manufacturing method of hot-press formed member
JP2007100193A (en) * 2005-10-07 2007-04-19 Topy Ind Ltd Method for manufacturing roller shell in carrier at lower part of construction machine

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