GB437248A - Improvements in or relating to the treatment of substantially unworn rails - Google Patents

Abstract

437,248. Rails. OXWELD RAILROAD SERVICE CO., 230, North Michigan Boulevard, Chicago, U.S.A.-(Assignees of George, H. S.) Aug. 7, 1934, No. 13552/35. Convention date, Sept. 6, 1933. Divided out of 435,953. [Class 104 (ii)] [See also Group XXII] The tread surfaces at or intermediate the ends of new or substantially uneven rails have surface layers of original metal removed for a length less than three inches and are then built up by deposition thereon of a metal capable of hardening on rapid cooling from an elevated temperature and acquiring a hardness of at least 60 Scleroscope after cold rolling. Large worn areas on rails under service may thus be avoided. The receiving end of a straight track rail joint, on which wear is greatest on the inside edge, has a part 17<1> cut away to a depth of about 0À04- 0À06" and the metal then deposited thereon. The deposit on the inner edge 21<1> may extend for a distance of two inches and on the outer outer edge 23<1> for a distance of half an inch. The rear edge of the deposit is thus diagonal to the rail so that wheels of rolling stock do not abruptly pass from a surface of one hardness to one of a different hardness. The leaving rail 12<1> may have a triangular deposit 18<1> extending half an inch along the inner edge and two inches across the end. For rails which are to be arranged so that more wear occurs from the middle to the outer edges, the shape of the deposits may be reversed. The deposited metal may be an air hardening steel such as an alloy steel containing 0À5 per cent of carbon, 0À9 to 1À1 per cent of manganese 0À9 to 1À1 per cent of chromium, and 0À4 to 0À6 per cent of silicon. The deposition is effected by welding. Rails may also be built up to a greater distance than three inches, in which case the hardness is in consequence reduced. Specification 435,953 is referred to.