EP0365985A1 - Borlegierte Stähle und Verfahren zum Glühen derselben - Google Patents

Borlegierte Stähle und Verfahren zum Glühen derselben Download PDF

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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Withdrawn
Application number
EP89119308A
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German (de)
English (en)
French (fr)
Inventor
Helmut Dr.-Ing. Brandis
Bernd Dr.-Ing. Huchtemann
Peter Dr.-Ing. Schüler
Dietrich Dr.-Ing. Werner
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.)
Thyssen Stahl AG
Original Assignee
Thyssen Edelstahlwerke AG
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 Thyssen Edelstahlwerke AG filed Critical Thyssen Edelstahlwerke AG
Publication of EP0365985A1 publication Critical patent/EP0365985A1/de
Withdrawn legal-status Critical Current

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    • 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.

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  • 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)
EP89119308A 1988-10-22 1989-10-18 Borlegierte Stähle und Verfahren zum Glühen derselben Withdrawn EP0365985A1 (de)

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 (enExample) 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 (enExample)
EP (1) EP0365985A1 (enExample)
KR (1) KR910008148A (enExample)
DE (1) DE3917071C1 (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
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
EP1488022A1 (en) * 2002-03-01 2004-12-22 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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
US5022933A (en) 1991-06-11
KR910008148A (ko) 1991-05-30
DE3917071C1 (enExample) 1990-04-19

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