Process for manufacturing a high strength rail

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

148146, 148 12B, C21D 1100

Patent

active

048103110

ABSTRACT:
Starting from a temperature at or above the A.sub.3 transformation point of the steel of the rail, the head of the rail is cooled to a temperature not lower than the Ms point at a rate lower than the critical quenching rate so that the head acquires a fine perlitic structure. Simultaneously the web is superficially cooled to the Ms point or below, at a rate greater than the head, so as to obtain a surface layer of martensite and/or bainite, and the surface cooling is controlled so that, at the end of controlled cooling, internal portions of the web not transformed to martensite and/or bainite retain sufficient heat to temper the surface layer during subsequent cooling to ambient temperature. At the same time the flange of the rail is cooled at a rate ensuring straightness of the rail.

REFERENCES:
patent: 4203783 (1980-05-01), Economopoulos et al.
patent: 4486248 (1984-12-01), Ackert et al.
patent: 4668308 (1987-05-01), Economopoulos et al.
patent: 4714500 (1987-12-01), Heller et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Process for manufacturing a high strength rail does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for manufacturing a high strength rail, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for manufacturing a high strength rail will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1666232

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.