EP0265402A1 - Acier traité au calcium et contenant du bore, présentant une meilleure usinabilité - Google Patents

Acier traité au calcium et contenant du bore, présentant une meilleure usinabilité Download PDF

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Publication number
EP0265402A1
EP0265402A1 EP87850292A EP87850292A EP0265402A1 EP 0265402 A1 EP0265402 A1 EP 0265402A1 EP 87850292 A EP87850292 A EP 87850292A EP 87850292 A EP87850292 A EP 87850292A EP 0265402 A1 EP0265402 A1 EP 0265402A1
Authority
EP
European Patent Office
Prior art keywords
boron
steel
titanium
content
calcium
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
EP87850292A
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German (de)
English (en)
Other versions
EP0265402B1 (fr
Inventor
Vesa Ollilainen
Hannu Pöntinen
Martti Paju
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.)
Ovako Bar Oy
Original Assignee
Ovako Steel Oy
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 Ovako Steel Oy filed Critical Ovako Steel Oy
Priority to AT87850292T priority Critical patent/ATE66700T1/de
Publication of EP0265402A1 publication Critical patent/EP0265402A1/fr
Application granted granted Critical
Publication of EP0265402B1 publication Critical patent/EP0265402B1/fr
Expired legal-status Critical Current

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    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • the object of the present invention is improved machinable calcium treated boron alloyed steel, wherein a free boron content sufficient for hardenability is obtained without Ti and/or Al contents disadvantageous to machinability. With this invention the weaknesses of the known techniques are avoided.
  • the free boron content sufficient for hardenability is obtained by binding the dissolved nitrogen aluminium and/or titanium.
  • the machinability of the known steels is poor for the following reasons: - As a result of titanium alloying (about 0.02-0.05 wt-%) required to protect boron, the steel contains extremely hard large TiN particles which have a disadvantageous effect on machinability. - The high Al content (0.05-0.1 wt-%) required to protect the boron impairs machinability. - The machinability of boron steels of these known types cannot be essentially improved by calcium treatment.
  • the steel of the present invention amounts of Al and Ti added are so low that they do not bind all the dissolved nitrogen.
  • the excessive part of nitrogen, which remains after the binding by titanium and aluminium, is bound to boron to give boron nitrides.
  • a sufficient amount of boron is alloyed so that in addition to the boron in nitrides, the steel contains about 10-30 weight-ppm chemically free boron.
  • Titanium alloying is restricted to prevent the precipitation of large so-called primary titanium nitrides in the molten state.
  • the maximum amount of titanium added depends on the nitrogen content of the steel. If desired, the titanium may be left out altogether.
  • At least 0.005 wt-% of aluminium is alloyed in order to kill the steel, to reduce the grain size and to obtain the correct type of non metallic inclusions. Aluminium contents of over 0.014 wt-% are not alloyed due to the deterioration of machinability.
  • the steel of the present invention has been calcium treated in ladle.
  • the calcium treatment improves the machinability of the steel. Full advantage is gained from the calcium treatment because high Ti or Al contents are not used.
  • the steel of the present invention contains the following alloying elements shown below in percentages by weight: carbon 0.01 - 0.50% silicon 0.01 - 2.00% manganese 0.40 - 1.60% sulphur 0.01 - 0.30% chromium 0 - 2.00% molybdenum 0 - 0.80%
  • the use of the steel determines the alloying element combination selected.
  • Boron is an element which intensifies the hardenability of steel considerably with very low contents of chemically free boron.
  • boron has a hardenability intensifying effect only when it is dissolved in steel in chemically free form, it should be ensured that boron is not bound in compounds - mainly BN or B2O3 - or that the free boron content is the said 0.001-0.004 wt-% also after a part of the boron is bound in the above-mentioned compounds.
  • the obtaining of a stable hardenability effect of boron is ensured by adding nitrogen binding elements such as Ti and/or Al (also Zr, V, Nb) and a standa rd amount of boron after a thorough deoxidation.
  • nitrogen binding elements such as Ti and/or Al (also Zr, V, Nb) and a standa rd amount of boron after a thorough deoxidation.
  • Titanium forms extremely hard cubic TiN particles which wear machining tools abrasively. This is shown by the shorter tool life when machining titanium alloyed steels. Fig. 1.
  • the calcium treatment does not, however, affect the titanium nitride particles. Therefore, the machinability of titanium protected boron steel cannot be improved by calcium treatment. Fig. 3.
  • the steel of the present invention is also alloyed at least 0.01% sulphur because it is well known that sulphur addition improves machinability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Catalysts (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
EP87850292A 1986-09-29 1987-09-28 Acier traité au calcium et contenant du bore, présentant une meilleure usinabilité Expired EP0265402B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87850292T ATE66700T1 (de) 1986-09-29 1987-09-28 Mit kalzium behandelter, bor enthaltender stahl mit verbesserter zerspannbarkeit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI863918 1986-09-29
FI863918A FI75870C (fi) 1986-09-29 1986-09-29 Kalsiumbehandlat borlegerat staol med foerbaettrad skaerbarhet.

Publications (2)

Publication Number Publication Date
EP0265402A1 true EP0265402A1 (fr) 1988-04-27
EP0265402B1 EP0265402B1 (fr) 1991-08-28

Family

ID=8523221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87850292A Expired EP0265402B1 (fr) 1986-09-29 1987-09-28 Acier traité au calcium et contenant du bore, présentant une meilleure usinabilité

Country Status (4)

Country Link
EP (1) EP0265402B1 (fr)
AT (1) ATE66700T1 (fr)
DE (2) DE3772511D1 (fr)
FI (1) FI75870C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487250A1 (fr) * 1990-11-16 1992-05-27 Daido Tokushuko Kabushiki Kaisha Acier apte au durcissement par induction
WO1996023084A1 (fr) * 1995-01-24 1996-08-01 Caterpillar Inc. Objet en acier au bore durci en profondeur, presentant des caracteristiques ameliorees en matiere de tenacite et de resistance a l'usure
WO2012048917A1 (fr) * 2010-10-11 2012-04-19 Schaeffler Technologies AG & Co. KG Acier de traitement, son utilisation sous la forme de barres, broche filetée, crémaillère, éléments de crémaillère et leur procédé de fabrication
CN104789878A (zh) * 2015-05-05 2015-07-22 内蒙古包钢钢联股份有限公司 一种高淬透性油套管接箍料用无缝钢管及制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5837837B2 (ja) * 2012-02-08 2015-12-24 Ｊｆｅ条鋼株式会社 工具寿命に優れた硬度が３００ｈｖ１０以上の高硬度ｂｎ系快削鋼

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388214A (en) * 1941-08-27 1945-10-30 Bethlehem Steel Corp Machining steels
FR2088862A5 (en) * 1970-04-18 1972-01-07 Nippon Kokan Kk Free cutting steel
US3634073A (en) * 1969-07-09 1972-01-11 United States Steel Corp Free-machining steel, articles thereof and method of making
US4265660A (en) * 1979-07-03 1981-05-05 Henrik Giflo High-strength free-cutting steel able to support dynamic stresses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388214A (en) * 1941-08-27 1945-10-30 Bethlehem Steel Corp Machining steels
US3634073A (en) * 1969-07-09 1972-01-11 United States Steel Corp Free-machining steel, articles thereof and method of making
FR2088862A5 (en) * 1970-04-18 1972-01-07 Nippon Kokan Kk Free cutting steel
US4265660A (en) * 1979-07-03 1981-05-05 Henrik Giflo High-strength free-cutting steel able to support dynamic stresses

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487250A1 (fr) * 1990-11-16 1992-05-27 Daido Tokushuko Kabushiki Kaisha Acier apte au durcissement par induction
WO1996023084A1 (fr) * 1995-01-24 1996-08-01 Caterpillar Inc. Objet en acier au bore durci en profondeur, presentant des caracteristiques ameliorees en matiere de tenacite et de resistance a l'usure
WO2012048917A1 (fr) * 2010-10-11 2012-04-19 Schaeffler Technologies AG & Co. KG Acier de traitement, son utilisation sous la forme de barres, broche filetée, crémaillère, éléments de crémaillère et leur procédé de fabrication
US9267195B2 (en) 2010-10-11 2016-02-23 Schaeffler Technologies AG & Co. KG Tempered steel
CN104789878A (zh) * 2015-05-05 2015-07-22 内蒙古包钢钢联股份有限公司 一种高淬透性油套管接箍料用无缝钢管及制备方法
CN104789878B (zh) * 2015-05-05 2017-03-15 内蒙古包钢钢联股份有限公司 一种高淬透性油套管接箍料用无缝钢管及制备方法

Also Published As

Publication number Publication date
ATE66700T1 (de) 1991-09-15
FI75870C (fi) 1988-08-08
FI863918A0 (fi) 1986-09-29
DE265402T1 (de) 1990-02-08
FI75870B (fi) 1988-04-29
EP0265402B1 (fr) 1991-08-28
DE3772511D1 (de) 1991-10-02

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