WO2015188796A4 - Method of heat treatment of bearing steel - Google Patents

Method of heat treatment of bearing steel Download PDF

Info

Publication number
WO2015188796A4
WO2015188796A4 PCT/CZ2015/000060 CZ2015000060W WO2015188796A4 WO 2015188796 A4 WO2015188796 A4 WO 2015188796A4 CZ 2015000060 W CZ2015000060 W CZ 2015000060W WO 2015188796 A4 WO2015188796 A4 WO 2015188796A4
Authority
WO
WIPO (PCT)
Prior art keywords
steel
temperature
annealing
cooling
rate
Prior art date
Application number
PCT/CZ2015/000060
Other languages
French (fr)
Other versions
WO2015188796A1 (en
Inventor
Daniela HAUSEROVÁ
Zbyšek NOVÝ
Jaromir DLOUHÝ
Uwe Diekmann
Original Assignee
Comtes Fht A.S.
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 Comtes Fht A.S. filed Critical Comtes Fht A.S.
Priority to EP15741719.7A priority Critical patent/EP3155134A1/en
Publication of WO2015188796A1 publication Critical patent/WO2015188796A1/en
Publication of WO2015188796A4 publication Critical patent/WO2015188796A4/en

Links

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
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D1/78—Combined heat-treatments not provided for above
    • C21D1/785—Thermocycling
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/02—Mechanical properties
    • F16C2202/04—Hardness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/66—High carbon steel, i.e. carbon content above 0.8 wt%, e.g. through-hardenable steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
    • F16C2223/18—Hardening, e.g. carburizing, carbo-nitriding with induction hardening

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

This heat treatment of bearing steel comprises annealing and hardening. Hardening is carried out after annealing and after the manufacture of structural parts from this steel. The first part of the annealing process is heating of the steel at a rate of more than 1 °C/s to a temperature in the range between 750 °C and 900 °C. It is followed by holding at the temperature achieved for at least 400 seconds. This is followed by cooling at a rate higher than 0.02 °C/s to a temperature, at which austenite begins to transform to ferrite and carbides. In the next step, there is cooling to such temperature and at such rate that complete transformation of austenite to ferrite and carbides takes place at least in the desired location of the steel. The cycle of heating, holding and cooling is carried out at least once. Then the steel is cooled to the ambient temperature. In the preferred embodiment, the quenching temperature during subsequent hardening is lower than the quenching temperature of the conventionally annealed steel in question. The steel may be heated by induction.

Claims

AMENDED CLAIMS received by the International Bureau on 30 November 2015 (30.1 1 .2015) Claims
1. A method of heat treatment of bearing steel comprising annealing and hardening where hardening takes place after annealing and after the manufacture of structural parts of this steel where, in said annealing process, the first step is heating of the steel at a rate of more than 1 °C/s to a temperature in the range between 750 °C and 900 °C,
after which the steel is held at the temperature achieved for no more than 400 s,
and then cooled at a rate higher than 0.02 °C/s to a temperature, at which austenite starts to translorm into ferrite and carbides, and cooling process further continues to such temperature and at such rate that, at least in the desired location of the steel, austenite completely transforms to ferrite and carbides,
where the cycle of heating, holding and cooling is carried out at least once
and followed by cooling the steel to the ambient temperature
characterised in that the c]uenehing temperature in subsequent quenching is lower than the quenching temperature of the steel in question upon conventional annealing.
2. The method of heat treatment, of bearing steel according to Claim 1 characterised in that the steel is heated by electrical induction.
PCT/CZ2015/000060 2014-06-12 2015-06-11 Method of heat treatment of bearing steel WO2015188796A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15741719.7A EP3155134A1 (en) 2014-06-12 2015-06-11 Method of heat treatment of bearing steel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ2014-405A CZ2014405A3 (en) 2014-06-12 2014-06-12 Heat treatment process of bearing steel
CZPV2014-405 2014-06-12

Publications (2)

Publication Number Publication Date
WO2015188796A1 WO2015188796A1 (en) 2015-12-17
WO2015188796A4 true WO2015188796A4 (en) 2017-03-02

Family

ID=53723964

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CZ2015/000060 WO2015188796A1 (en) 2014-06-12 2015-06-11 Method of heat treatment of bearing steel

Country Status (3)

Country Link
EP (1) EP3155134A1 (en)
CZ (1) CZ2014405A3 (en)
WO (1) WO2015188796A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2734208C1 (en) * 2020-02-05 2020-10-13 Федеральное Государственное Унитарное Предприятие "Центральный Научно-Исследовательский Институт Конструкционных Материалов "Прометей" Имени И.В. Горынина Национального Исследовательского Центра "Курчатовский Институт" Thermal treatment method to produce parts with high dimensional accuracy
CN113337694B (en) * 2021-06-30 2022-01-04 临清市同兴轴承锻造有限公司 Spheroidizing annealing heat treatment method for ultrahigh-carbon bearing steel
CN114959202A (en) * 2022-04-25 2022-08-30 中钢集团邢台机械轧辊有限公司 Heat treatment method of rolling mill supporting roll

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4362553A (en) * 1979-11-19 1982-12-07 Marko Materials, Inc. Tool steels which contain boron and have been processed using a rapid solidification process and method
JPH04103715A (en) * 1990-08-23 1992-04-06 Sumitomo Metal Ind Ltd Method for spheroidizing high-carbon chromium bearing steel
JP3303176B2 (en) * 1993-12-27 2002-07-15 光洋精工株式会社 Bearing parts
GB9608108D0 (en) * 1996-04-19 1996-06-26 Naco Inc Steel Castings
CZ347299A3 (en) * 1998-04-01 2000-09-13 Ascometal Steel for producing elements of rolling-contact bearings, process of its manufacture, seamless tube and element of rolling-contact bearing element of steel
DE102004037074B3 (en) * 2004-07-30 2005-12-22 Aktiebolaget Skf Heat treatment system for piece of steel comprises heating to 1100 degrees C over 120 seconds and maintained at high temperature for 0.5 to 20 seconds before rapid cooling
EP2554686B1 (en) * 2010-03-30 2018-07-25 Aisin Seiki Kabushiki Kaisha Method for manufacturing base material for wave gear
CZ302676B6 (en) * 2010-07-15 2011-08-31 Comtes Fht A.S. Method of annealing steel half-finished product
DE102011051682B4 (en) * 2011-07-08 2013-02-21 Max Aicher Method and apparatus for treating a steel product and steel product

Also Published As

Publication number Publication date
CZ305587B6 (en) 2015-12-23
CZ2014405A3 (en) 2015-12-23
EP3155134A1 (en) 2017-04-19
WO2015188796A1 (en) 2015-12-17

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