Process for manufacturing high-strength bainitic steel rails wit

Details Process for manufacturing high-strength bainitic steel rails wit Process for manufacturing high-strength bainitic steel rails wit

1994-02-24

1995-01-17

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148320, C21D 904, C22C 3818

Patent

active

053823079

ABSTRACT:
A process for manufacturing high-strength bainitic steel rails with an excellent rolling-contact fatigue resistance comprising the steps of hot rolling steel containing 0.15% to 0.45% carbon, 0.15% to 2.00% silicon, 0.30% to 2.00% manganese, 0.50% to 3.00% chromium, and at least one element selected from a group of molybdenum, nickel, copper, niobium, vanadium, titanium and boron, subjecting the hot-rolled rail to an accelerated cooling from the austenite region to a temperature between 500.degree. to 300.degree. C., at which the accelerated cooling is stopped, at a rate of 1.degree. to 10.degree. C. per second, and then further cooling the rail to a lower temperature by natural or controlled cooling. The obtained rail exhibits a hardness of Hv 300 to 400 in the center of the rail head surface of the head and not lower than Hv 350 in the gage corner, and the hardness of the gage corner is higher than that of the center of the rail head surface by Hv 30 or more.

REFERENCES:
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patent: 5004510 (1991-04-01), Yu et al.
patent: 5328531 (1994-07-01), Gautier
Data base WPI, Section Ch, Week 8029, Class M24-D03, AN 80-51085C, Derwent Publications, Ltd., corresponding to JP55-023885.
Data base WPI, Section Ch, Week 8421, Class M24-D03, AN 80-81348C, Derwent Publications Ltd., corresponding to JP59-019173.
Patent Abstracts of Japan, vol. 2, No. 35, (E-020), Mar. 9, 1978, corresponding to JP53-001074.
European Search Report EP 94 10 2721.

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