JPS5763635A - Production of steel bar for cold forming - Google Patents

Production of steel bar for cold forming

Info

Publication number
JPS5763635A
JPS5763635A JP13835280A JP13835280A JPS5763635A JP S5763635 A JPS5763635 A JP S5763635A JP 13835280 A JP13835280 A JP 13835280A JP 13835280 A JP13835280 A JP 13835280A JP S5763635 A JPS5763635 A JP S5763635A
Authority
JP
Japan
Prior art keywords
steel bar
temp
deposition
rolled
cementite
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
JP13835280A
Other languages
Japanese (ja)
Inventor
Hisashi Gondo
Kazunari Yamato
Hisashi Inoue
Koji Tanabe
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 JP13835280A priority Critical patent/JPS5763635A/en
Publication of JPS5763635A publication Critical patent/JPS5763635A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/52—Friction retainers acting on under or rear side of article being separated
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Landscapes

  • 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 Steel (AREA)

Abstract

PURPOSE:To save spheroidizing heat treatment and obtain a steel bar of small deformation resistance during cold forging by holding a hot rolled-steel bar at the temp. below AC1 temp. amd as close to the same as possible. CONSTITUTION:The hot-rolled steel bar of 0.15-0.45 C by %, <=0.1 Si, 0.1-1.0 Mn, <=0.020 A, <=0.02 Ca and the balance substantially Fe is rolled, after which it is put in a furnace of the temp. above 600 deg.C, below the AC1 transformation point and not lower by 50 deg.C than the AC1 transformation point, and is maintained for >=5hr. Then, cementite cohesively deposits and the strength lowers. However, the formation of coarse ferrite grains occurs and the cracking during cold forging is liable to occur. To prevent this, Si is kept low, and Al, Ca are made essential. However, a large amt. of Al leads to brittle grain boundaries on account of deposition of AlN. The Ca at the upper limit is sufficient. The holding temp. is required t be below the AC1 point on account of cementite deposition and to be above the lower limit in order to expedite the cohesion thereof. The time is the time required for the deposition and cohesion thereof.
JP13835280A 1980-10-03 1980-10-03 Production of steel bar for cold forming Pending JPS5763635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13835280A JPS5763635A (en) 1980-10-03 1980-10-03 Production of steel bar for cold forming

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13835280A JPS5763635A (en) 1980-10-03 1980-10-03 Production of steel bar for cold forming

Publications (1)

Publication Number Publication Date
JPS5763635A true JPS5763635A (en) 1982-04-17

Family

ID=15219918

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13835280A Pending JPS5763635A (en) 1980-10-03 1980-10-03 Production of steel bar for cold forming

Country Status (1)

Country Link
JP (1) JPS5763635A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5970724A (en) * 1982-10-15 1984-04-21 Seiko Instr & Electronics Ltd Rolled hot-forged thread
JPS6050149A (en) * 1983-08-26 1985-03-19 Daido Steel Co Ltd Structural steel
JPS63216952A (en) * 1987-03-04 1988-09-09 Daido Steel Co Ltd Cold forging steel
JP2006097035A (en) * 2004-09-28 2006-04-13 Aichi Steel Works Ltd Method for producing gear stock for high speed dry cutting and method for producing gear using the gear stock
CN106801200A (en) * 2017-02-07 2017-06-06 和县隆盛精密机械有限公司 A kind of abrasion-resistant stee and its preparation technology suitable for mechanical arm processing

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5970724A (en) * 1982-10-15 1984-04-21 Seiko Instr & Electronics Ltd Rolled hot-forged thread
JPS6050149A (en) * 1983-08-26 1985-03-19 Daido Steel Co Ltd Structural steel
JPH0456104B2 (en) * 1983-08-26 1992-09-07 Daido Steel Co Ltd
JPS63216952A (en) * 1987-03-04 1988-09-09 Daido Steel Co Ltd Cold forging steel
JP2006097035A (en) * 2004-09-28 2006-04-13 Aichi Steel Works Ltd Method for producing gear stock for high speed dry cutting and method for producing gear using the gear stock
JP4534694B2 (en) * 2004-09-28 2010-09-01 愛知製鋼株式会社 Manufacturing method of gear material for high speed dry cutting and manufacturing method of gear using the gear material
CN106801200A (en) * 2017-02-07 2017-06-06 和县隆盛精密机械有限公司 A kind of abrasion-resistant stee and its preparation technology suitable for mechanical arm processing

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