Patent ID: 6177205
Filing Date: 2001-01-23
Classification: B23K,C21D,E01B,Y10T

Abstract:
A process for manufacture of a railroad track part, comprising a first part made of carbon steel and a second part made of austenitic manganese steel, comprising the steps of:joining the austenitic manganese steel part to the carbon steel by a process step of1) directly joining the first and second parts by electron beam welding, or2) indirectly joining the first and second parts by disposing therebetween an intermediate layer comprising a nickel-based alloy, and welding the first and second parts together;heating the first and seconds parts thus joined as a unit to a temperature T, and holding at temperature T for a time t sufficient to result in the austenitic manganese steel solution annealing and the carbon steel austenitizing; andpartially quenching the joined and heated first and second parts after the holding time t at temperature T such that the austenitic manganese steel is provided in an austenitic structure and the carbon steel is in a mixed structure with at least bainite and pearlite contents.