PUBLIC DOMAIN TECHNICAL FREE PATENT

This work is for public use. It is into the public domain to be used for public.

Dear Sirs,

The "side hardening" of railway rails (called 'side hardened railway rails') is rather a concept, than a technology.

It consists in a composite of steel tempering components in all the parts of rail : head, web and base (foot).

Many rail manufacturers do no longer try to harden only the head of the rail. It do not solve fatigue problem of rails. The head hardened rails are not a solution.

Rail manufacturers try in any way, as they consider better, and with any technology they consider the best, to obtain "side hardened rails". Therefore, tyr to achieve all the structures in all the parts of rail.

More exactly, the head, the web, and the foot must have (independent each one from another) all the components : pearlite, pearlite+sorbite, sorbite, sorbite+troostite, troostite, troostite+martensite, and even full martensite. As mach as possible, between head, web, and foot may be a full pearlite or pearlite+sorbite stratum (zone), which is called "break(ing) of hardness".
Therefore, as possible, the troostite and martensite will be independent in head, web, and foot.

The railway rail is a special type of piece, it is a slim piece that works both as wearing piece and as a girder. It represents one among the few cases in technical domain, where a steel piece is useful strong quenched also in the non wearing surfaces.

In the next time, many discussions may de done related to this subject, but only in-between the limits of the free patent.

The concept of "side hardened rail" belongs to the technical public domain, and may be not included in any copyrighted work.

Anywhere in the world may exist samples of such of railway rails.

Most of rails are in the curves and in the switches of mining rails which are not used by national network rail-cars, and in some crane rail (for overloading testing of heavy rails). There are look-up for service behaving conclusion.

There were used rails type 40 in some "push-pull" mining rails, (at low speed) to work as 25000 kilos/axle rails for over loading test.

The results and measurment of service beheaving are not subject of free patent for moment.

Only the concept of "side hardened rails" and the used steels (only as chemical componence), and hardness values , are now in subject.

All the rails were used as screw joint, with, or without end harhening, with or without round hardened hole. Results are not subject for discussion now.

More details with the advantages of "side hardened rails" and ilustrations may be soon available.

 http://s69.photobucket.com/albums/i66/vignole/

Best regards,
TRDA team.