EP0365985A1 - Borlegierte Stähle und Verfahren zum Glühen derselben - Google Patents
Borlegierte Stähle und Verfahren zum Glühen derselben Download PDFInfo
- Publication number
- EP0365985A1 EP0365985A1 EP89119308A EP89119308A EP0365985A1 EP 0365985 A1 EP0365985 A1 EP 0365985A1 EP 89119308 A EP89119308 A EP 89119308A EP 89119308 A EP89119308 A EP 89119308A EP 0365985 A1 EP0365985 A1 EP 0365985A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- boron
- annealing
- products
- gas atmosphere
- case
- 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.)
- Withdrawn
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
- C23C8/68—Boronising
- C23C8/70—Boronising of ferrous surfaces
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
Definitions
- the invention relates to boron-alloyed steels and a method for annealing products made of steels with boron contents up to 200 ppm in the temperature range from 850 to 1,050 o C.
- the invention is based on the object, in the high-temperature annealing of products made of steels with boron in dissolved form, to prevent boron from escaping or boron from the steel even being supplied in a predefined quantity in dissolved form without a hard boride layer on the surface forms.
- a steel is proposed according to the invention and a method in which the products are annealed in a non-oxidizing gas atmosphere with a boron potential supplied by a source of powdered boron oxide (B2O3) of such a size that the products retain their boron content maintain or record.
- B2O3 powdered boron oxide
- the method according to the invention is not comparable to the known boronization of steels, in which the boron activity in the annealing atmosphere is of a completely different order of magnitude around or above 1, while in the method according to the invention it is several orders of magnitude lower.
- the steel in the borated zone absorbs boron contents in the% range when boroning, with the formation of iron boride (FeB and Fe2B), i.e. contents which are far above the solubility limit (in the gamma iron at 1000 o C approx. 75 ppm B). Boronizing is described in the Technical book "Borieren" by A. Graf von Matuschka (1977), Carl Hanser Verlag. Boron processes are also known from DE-OS 2 126 379 and GB-PS 1 435 045.
- annealing should take place in the equilibrium state, that is to say under constant temperature, pressure and concentration conditions, including constant boron activity or constant boron partial pressure in the annealing atmosphere.
- the method according to the invention is therefore aimed at the layer-free setting of a content of dissolved boron in the matrix, without having to remove a hard boron layer that is produced in the process.
- the glow gas atmosphere consists mainly of hydrogen
- the boron potential can be greatly reduced in the presence of B2O3, because at most traces of oxygen are still contained in the glow gas atmosphere.
- the neutral atmosphere also protects the steel from scaling and boron depletion.
- the annealing preferably takes place in the boron-containing gas atmosphere in the box without circulating the gas atmosphere, because then depletion of the boron annealing atmosphere can be prevented by condensation of the boron oxide. Instead, the boron potential can be maintained in the annealing gas atmosphere for hours.
- the process according to the invention also makes it possible to case-harden products and even products made of a steel that does not contain boron, and at the same time with soluble boron in an amount up to about 200 ppm B to alloy.
- Nicholson had only succeeded in alloying iron from an iron boride coating layer with boron if the sample was completely surrounded by boron powder when annealed in a hydrogen atmosphere. In contrast, boron did not diffuse into an iron sample in vacuum or under helium as a protective gas. Grabke / Paju (op. Cit.) Recently did not consider the simultaneous carburizing of steel and alloying with boron possible.
- the boron source consisting of inexpensive powdered boron oxide can be mixed with the case hardener during annealing with simultaneous carburizing.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Soft Magnetic Materials (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3836102 | 1988-10-22 | ||
DE3836102 | 1988-10-22 | ||
DE3917071 | 1989-05-26 | ||
DE3917071A DE3917071C1 (ja) | 1988-10-22 | 1989-05-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0365985A1 true EP0365985A1 (de) | 1990-05-02 |
Family
ID=25873531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89119308A Withdrawn EP0365985A1 (de) | 1988-10-22 | 1989-10-18 | Borlegierte Stähle und Verfahren zum Glühen derselben |
Country Status (4)
Country | Link |
---|---|
US (1) | US5022933A (ja) |
EP (1) | EP0365985A1 (ja) |
KR (1) | KR910008148A (ja) |
DE (1) | DE3917071C1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5840132A (en) * | 1996-04-24 | 1998-11-24 | Arch Development Corporation | Lubricated boride surfaces |
ES2188401B1 (es) * | 2001-10-10 | 2004-03-01 | Linares Fernanda Ruiz | Acero en su composicion hidrogeno |
WO2003074758A1 (en) * | 2002-03-01 | 2003-09-12 | Stichting Voor De Technische Wetenschappen | Method of forming a diamond coating on an iron-based substrate and use of such an iron-based substrate for hosting a cvd diamond coating |
CN102963902B (zh) * | 2012-11-14 | 2014-10-29 | 陕西科技大学 | 一种层状形貌硼酸晶体材料的制备方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1671870A (en) * | 1926-02-27 | 1928-05-29 | Taylorwharton Iron And Steel C | Method of treating manganese steel |
EP0242032A2 (en) * | 1986-04-15 | 1987-10-21 | Allegheny Ludlum Corporation | Method of producing low core losses in oriented silicon steels |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2126379C3 (de) * | 1971-05-27 | 1979-09-06 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Verfahren zum Borieren von Metallen, insbesondere von Stahl |
US3922038A (en) * | 1973-08-10 | 1975-11-25 | Hughes Tool Co | Wear resistant boronized surfaces and boronizing methods |
FR2339678A1 (fr) * | 1976-01-28 | 1977-08-26 | Ugine Aciers | Aciers a caracteristiques mecaniques ameliorees par additions controlees de b, al et n |
JPS58174551A (ja) * | 1982-04-03 | 1983-10-13 | Sumitomo Electric Ind Ltd | ボロン含有鋼およびその製造方法 |
JPS60128247A (ja) * | 1983-12-16 | 1985-07-09 | Ube Ind Ltd | 破粉砕機部材用の高靭性耐摩耗鋳鋼 |
JPS60174852A (ja) * | 1984-02-18 | 1985-09-09 | Kawasaki Steel Corp | 深絞り性に優れる複合組織冷延鋼板とその製造方法 |
-
1989
- 1989-05-26 DE DE3917071A patent/DE3917071C1/de not_active Expired - Lifetime
- 1989-10-16 US US07/421,590 patent/US5022933A/en not_active Expired - Fee Related
- 1989-10-18 EP EP89119308A patent/EP0365985A1/de not_active Withdrawn
- 1989-10-20 KR KR1019890015142A patent/KR910008148A/ko not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1671870A (en) * | 1926-02-27 | 1928-05-29 | Taylorwharton Iron And Steel C | Method of treating manganese steel |
EP0242032A2 (en) * | 1986-04-15 | 1987-10-21 | Allegheny Ludlum Corporation | Method of producing low core losses in oriented silicon steels |
Non-Patent Citations (2)
Title |
---|
METAL SCIENCE AND HEAT TREATMENT, Band 24, Nr. 3/4, März-April 1982, Seiten 260-263, Plenum Publishing Corp., New York, US; L.S. LYAKHOVICH: "Boriding of steels in gaseous media" * |
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 199 (C-359)[2255], 11. Juli 1986, Seite 80 C 359; & JP-A-61 41 718 (ORIENTAL ENG. K.K.) 28-02-1986 * |
Also Published As
Publication number | Publication date |
---|---|
DE3917071C1 (ja) | 1990-04-19 |
US5022933A (en) | 1991-06-11 |
KR910008148A (ko) | 1991-05-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19900518 |
|
17Q | First examination report despatched |
Effective date: 19920410 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19930702 |