GB1380635A - Steel for rolling elements - Google Patents

Steel for rolling elements

Info

Publication number
GB1380635A
GB1380635A GB4769272A GB4769272A GB1380635A GB 1380635 A GB1380635 A GB 1380635A GB 4769272 A GB4769272 A GB 4769272A GB 4769272 A GB4769272 A GB 4769272A GB 1380635 A GB1380635 A GB 1380635A
Authority
GB
United Kingdom
Prior art keywords
steel
sec
carbide
quasi
volume
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.)
Expired
Application number
GB4769272A
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.)
NSK Ltd
Original Assignee
NSK Ltd
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 NSK Ltd filed Critical NSK Ltd
Priority to GB4769272A priority Critical patent/GB1380635A/en
Publication of GB1380635A publication Critical patent/GB1380635A/en
Expired legal-status Critical Current

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
    • 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

Abstract

1380635 Heat treating steel NIPPON SEIKO KK 17 Oct 1972 47692/72 Heading C7A Steel for rolling elements such as bearings or gears has at least a surface layer comprising a dispersion of 0À2 to 10 micron quasi-carbide particles See Figs. 1A, 1B in a martensite matrix the particles forming 15% to 80% by volume of the layer. The quasi-carbide particles are approximately spherical and consist of a carbide core containing 2% to 5% of carbon within an outer shell of retained austenite having a carbon content decreasing progressively towards the surface. The structure is obtained from a starting material containing at least in its surface region 5% to 40% by volume of a granular carbide and consisting of:- wherein Cr and Mo together may be present in a minimum amount of 0À2% with Cr 0À06 to 2À5%, and 0À06 to 0À6% of Mo, by heating from 850‹C to a temperature in the range 1000 C to 1250‹C at an average rate of greater than 10‹C/sec., and then quenching. Alternatively the steel may be heated directly from room temperature to 1000‹C to 1250‹C at an average rate greater than 25‹C/sec. with the rate above 850‹C being at least 10‹C/sec. To obtain the desired structure a low carbon steel may be initially surface carburized.
GB4769272A 1972-10-17 1972-10-17 Steel for rolling elements Expired GB1380635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4769272A GB1380635A (en) 1972-10-17 1972-10-17 Steel for rolling elements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4769272A GB1380635A (en) 1972-10-17 1972-10-17 Steel for rolling elements

Publications (1)

Publication Number Publication Date
GB1380635A true GB1380635A (en) 1975-01-15

Family

ID=10445930

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4769272A Expired GB1380635A (en) 1972-10-17 1972-10-17 Steel for rolling elements

Country Status (1)

Country Link
GB (1) GB1380635A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3525905A1 (en) * 1984-07-21 1986-01-30 Kanto Special Steel Works Ltd., Fujisawa, Kanagawa Steel for roller sheaths for continuous aluminium-casting units
US5468308A (en) * 1994-08-22 1995-11-21 The Torrington Company Surface treated cast iron bearing element
DE19710333A1 (en) * 1997-03-13 1998-09-17 Univ Dresden Tech Rolling steel with a delayed recrystallization of austenite
US6623567B2 (en) * 2000-05-12 2003-09-23 Nakamura Industrial Co., Ltd. Method for high concentration carburizing and quenching of steel and high concentration carburized and quenched steel part
DE19982613B3 (en) * 1998-11-11 2013-05-29 Ntn Corp. High-temperature bearings part

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3525905A1 (en) * 1984-07-21 1986-01-30 Kanto Special Steel Works Ltd., Fujisawa, Kanagawa Steel for roller sheaths for continuous aluminium-casting units
US5468308A (en) * 1994-08-22 1995-11-21 The Torrington Company Surface treated cast iron bearing element
WO1996006198A1 (en) * 1994-08-22 1996-02-29 The Torrington Company Surface treated iron bearing element
DE19710333A1 (en) * 1997-03-13 1998-09-17 Univ Dresden Tech Rolling steel with a delayed recrystallization of austenite
DE19982613B3 (en) * 1998-11-11 2013-05-29 Ntn Corp. High-temperature bearings part
US6623567B2 (en) * 2000-05-12 2003-09-23 Nakamura Industrial Co., Ltd. Method for high concentration carburizing and quenching of steel and high concentration carburized and quenched steel part

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee