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 PDFInfo
- 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
Links
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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
- C22C38/002—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.
Landscapes
- 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)
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)
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)
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)
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 |
-
1986
- 1986-09-29 FI FI863918A patent/FI75870C/fi not_active IP Right Cessation
-
1987
- 1987-09-28 AT AT87850292T patent/ATE66700T1/de not_active IP Right Cessation
- 1987-09-28 EP EP87850292A patent/EP0265402B1/fr not_active Expired
- 1987-09-28 DE DE8787850292T patent/DE3772511D1/de not_active Expired - Lifetime
- 1987-09-28 DE DE198787850292T patent/DE265402T1/de active Pending
Patent Citations (4)
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)
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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