JPS579860A - Free cutting steel for high-performance gear and its manufacture - Google Patents

Free cutting steel for high-performance gear and its manufacture

Info

Publication number
JPS579860A
JPS579860A JP2138081A JP2138081A JPS579860A JP S579860 A JPS579860 A JP S579860A JP 2138081 A JP2138081 A JP 2138081A JP 2138081 A JP2138081 A JP 2138081A JP S579860 A JPS579860 A JP S579860A
Authority
JP
Japan
Prior art keywords
steel
inclusions
gear
nonmetallic inclusions
manufacture
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
JP2138081A
Other languages
Japanese (ja)
Other versions
JPH0152467B2 (en
Inventor
Atsuyoshi Kimura
Shozo Abeyama
Takuji Yasuda
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co 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 Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to JP2138081A priority Critical patent/JPS579860A/en
Publication of JPS579860A publication Critical patent/JPS579860A/en
Publication of JPH0152467B2 publication Critical patent/JPH0152467B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: To manufacture a free cutting steel suitable for use as a material for high performance gear by adding Al and Ca-Si as a deoxidizer to molten steel during vacuum degassing and refining to convert nonmetallic inclusions into composite ones consisting of oxide and sulfide as well as to float and separate large-sized nonmetallic inclusions.
CONSTITUTION: When steel for gear us refined, Al and Ca-Si are used as a deoxidizer during vacuum degassing, and by carrying out forced agitation with a nonoxidizing gas, large-sized nonmetallic inclusions are floated, shifted into molten slag and removed. An adequate amount of Pb is then added to the molten steel and uniformly dispersed to refine the steel. The refined steel contains 0.10W0.55% C, <0.35% Si, <1.70% Mn, 0.20W0.15% Pb, 0.01W0.04% Al, 0.0002W0.0005% Ca, <0.06% S, <0.0030% O and <0.020% N. The residual nonmetallic inclusions are composite inclusions consisting of Al2O3-SiO2-CaO and (Mn, Ca)S, and ≥80% of the inclusions have ≤2.0 ratio of major axis/minor axis and ≤10μm major axis. Thus, the resulting steel has superior characteristics as gear steel.
COPYRIGHT: (C)1982,JPO&Japio
JP2138081A 1981-02-18 1981-02-18 Free cutting steel for high-performance gear and its manufacture Granted JPS579860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2138081A JPS579860A (en) 1981-02-18 1981-02-18 Free cutting steel for high-performance gear and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2138081A JPS579860A (en) 1981-02-18 1981-02-18 Free cutting steel for high-performance gear and its manufacture

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP3414778A Division JPS54126622A (en) 1978-03-27 1978-03-27 Freeecutting steel for high performance gear and method of making same

Publications (2)

Publication Number Publication Date
JPS579860A true JPS579860A (en) 1982-01-19
JPH0152467B2 JPH0152467B2 (en) 1989-11-08

Family

ID=12053480

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2138081A Granted JPS579860A (en) 1981-02-18 1981-02-18 Free cutting steel for high-performance gear and its manufacture

Country Status (1)

Country Link
JP (1) JPS579860A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946645A (en) * 1988-03-28 1990-08-07 Daido Tokushuko Kabushiki Kaisha Steel for gears, having high strength, toughness and machinability
JPH10287953A (en) * 1997-04-16 1998-10-27 Daido Steel Co Ltd Machine structural steel with excellent mechanical properties and drillability
JP2009074151A (en) * 2007-09-21 2009-04-09 Sanyo Special Steel Co Ltd Steel manufacturing method with excellent rolling fatigue life
CN103146883A (en) * 2013-04-03 2013-06-12 武汉钢铁(集团)公司 Smelting method for sulfur-containing low-oxygen gear steel
CN112647017A (en) * 2020-11-30 2021-04-13 江苏联峰能源装备有限公司 Method for controlling inclusions in gear steel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5010213A (en) * 1973-05-31 1975-02-01
JPS5077211A (en) * 1973-11-13 1975-06-24
JPS5416445A (en) * 1977-05-17 1979-02-07 Lummus Co Method of recovering isophthalonitrile
JPS54126622A (en) * 1978-03-27 1979-10-02 Daido Steel Co Ltd Freeecutting steel for high performance gear and method of making same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5010213A (en) * 1973-05-31 1975-02-01
JPS5077211A (en) * 1973-11-13 1975-06-24
JPS5416445A (en) * 1977-05-17 1979-02-07 Lummus Co Method of recovering isophthalonitrile
JPS54126622A (en) * 1978-03-27 1979-10-02 Daido Steel Co Ltd Freeecutting steel for high performance gear and method of making same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946645A (en) * 1988-03-28 1990-08-07 Daido Tokushuko Kabushiki Kaisha Steel for gears, having high strength, toughness and machinability
JPH10287953A (en) * 1997-04-16 1998-10-27 Daido Steel Co Ltd Machine structural steel with excellent mechanical properties and drillability
JP2009074151A (en) * 2007-09-21 2009-04-09 Sanyo Special Steel Co Ltd Steel manufacturing method with excellent rolling fatigue life
CN103146883A (en) * 2013-04-03 2013-06-12 武汉钢铁(集团)公司 Smelting method for sulfur-containing low-oxygen gear steel
CN112647017A (en) * 2020-11-30 2021-04-13 江苏联峰能源装备有限公司 Method for controlling inclusions in gear steel

Also Published As

Publication number Publication date
JPH0152467B2 (en) 1989-11-08

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