JPS5794516A - Method for heat treatment on low-carbon boron steel - Google Patents

Method for heat treatment on low-carbon boron steel

Info

Publication number
JPS5794516A
JPS5794516A JP17176680A JP17176680A JPS5794516A JP S5794516 A JPS5794516 A JP S5794516A JP 17176680 A JP17176680 A JP 17176680A JP 17176680 A JP17176680 A JP 17176680A JP S5794516 A JPS5794516 A JP S5794516A
Authority
JP
Japan
Prior art keywords
carbon
low
boron steel
parts
heat treatment
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
JP17176680A
Other languages
Japanese (ja)
Other versions
JPS5933190B2 (en
Inventor
Taisuke Miyamoto
Hiroo Nakamura
Yoichi Serino
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor 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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP55171766A priority Critical patent/JPS5933190B2/en
Publication of JPS5794516A publication Critical patent/JPS5794516A/en
Publication of JPS5933190B2 publication Critical patent/JPS5933190B2/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/02—Hardening by precipitation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

PURPOSE:To square the surface hardness and the internal hardness of parts after their surface is treated by slightly carburizing when the parts made of low- carbon boron steel is hardened, by setting the carbon potential of the atmosphere gas to a level higher than the carbon content of the crude material. CONSTITUTION:Parts made of a low carbon boron steel composed of 0.15- 0.35wt% C, 0.60-1.30wt% Mn, <=0.50% Cr, <=0.04% Ti, <=0.04% Al, 5-30ppm B, and the rest of Fe, are hardened in a protective atmosphere. In this case, the carbon potential of the atmosphere gas is set to a level which is 0.04-0.25 higher than the carbon content of the crude material, and the gas is minutely carburized into the surface of the parts. In this way, lowering in the surface hardenability due to the deboronization phenomenon of the low-carbon boron steel can be compensated, and moreover, other improvements, such as improvement in the fatigue strength of the parts, prevention of dents, etc., are also contrived. This heat treatment method is applied for high strength bolts for buildings.
JP55171766A 1980-12-05 1980-12-05 Heat treatment method for low carbon boron steel Expired JPS5933190B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55171766A JPS5933190B2 (en) 1980-12-05 1980-12-05 Heat treatment method for low carbon boron steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55171766A JPS5933190B2 (en) 1980-12-05 1980-12-05 Heat treatment method for low carbon boron steel

Publications (2)

Publication Number Publication Date
JPS5794516A true JPS5794516A (en) 1982-06-12
JPS5933190B2 JPS5933190B2 (en) 1984-08-14

Family

ID=15929274

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55171766A Expired JPS5933190B2 (en) 1980-12-05 1980-12-05 Heat treatment method for low carbon boron steel

Country Status (1)

Country Link
JP (1) JPS5933190B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930909A (en) * 1988-07-11 1990-06-05 Nippon Seiko Kabushiki Kaisha Rolling bearing
JPH0339460A (en) * 1989-07-06 1991-02-20 Sumitomo Metal Ind Ltd Steel parts excellent in bending fatigue strength and its production
EP0682123A1 (en) * 1994-04-25 1995-11-15 Samsung Heavy Industry Co., Ltd Method of manufacturing carburized steel products
JPH116048A (en) * 1997-06-12 1999-01-12 Daihatsu Motor Co Ltd Carburized member and carburizing method for steel containing boron
JP4782243B2 (en) * 2009-03-16 2011-09-28 新日本製鐵株式会社 Boron-added steel sheet with excellent hardenability and manufacturing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55104456A (en) * 1979-02-01 1980-08-09 Sumitomo Metal Ind Ltd Machine structural boron steel

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55104456A (en) * 1979-02-01 1980-08-09 Sumitomo Metal Ind Ltd Machine structural boron steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930909A (en) * 1988-07-11 1990-06-05 Nippon Seiko Kabushiki Kaisha Rolling bearing
JPH0339460A (en) * 1989-07-06 1991-02-20 Sumitomo Metal Ind Ltd Steel parts excellent in bending fatigue strength and its production
EP0682123A1 (en) * 1994-04-25 1995-11-15 Samsung Heavy Industry Co., Ltd Method of manufacturing carburized steel products
JPH116048A (en) * 1997-06-12 1999-01-12 Daihatsu Motor Co Ltd Carburized member and carburizing method for steel containing boron
JP4782243B2 (en) * 2009-03-16 2011-09-28 新日本製鐵株式会社 Boron-added steel sheet with excellent hardenability and manufacturing method

Also Published As

Publication number Publication date
JPS5933190B2 (en) 1984-08-14

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