Metal treatment – Compositions – Heat treating
Patent
1975-07-07
1976-11-30
Steiner, Arthur J.
Metal treatment
Compositions
Heat treating
75124, 75128A, 75128G, 75128T, 75128W, 75128V, C22C 3806, C22C 3824, C22C 3826, C22C 3828
Patent
active
039947548
ABSTRACT:
This invention provides a manganese steel having a high elastic limit and at the same time a good weldability, its composition comprising, in percentage by weight: Carbon, 0.09 to 0.15; manganese, 1.30 to 1.80; molybdenum, 0.15 to 0.35; silicon, 0.10 to 0.40; vanadium, 0.03 to 0.06; niobium or tantalum 0.005 to 0.05; aluminum, 0.015 to 0.050; titanium, 0.002 to 0.040; nickel, 0.10 to 0.30; chromium, 0.10 to 0.25; sulfur .ltoreq. 0.020 and phosphorus .ltoreq. 0.030, the balance to make 100 % consisting essentially of iron; furthermore, this steel has undergone a cycle of heat treatments including a homogenization at high temperature, a water quenching and a tempering, and has a very fine grained micro-structure consisting of bainite and ferrite; the steel thus obtained has a satisfactory weldability and an elastic limit .ltoreq. 550 N/mm.sup.2, an elastic-limit to tensile strength ration higher than 0.85 and a breaking energy at -50.degree. C measured on a V-notched test bar which is greater than or equal to 20 Joules. This steel is suitable for manufacturing one-piece articles or parts assembled by welding, notably for the manufacture of automatic one-piece or welded couplings for railway cars and wagons.
REFERENCES:
patent: 3216823 (1965-11-01), Gulya et al.
patent: 3402080 (1968-09-01), Kubota et al.
patent: 3834949 (1974-09-01), Heitmann et al.
Societe des Acieries de Paris & d'Outreau
Steiner Arthur J.
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