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OwnerFrancois-Xavier HOCHE, Véronique SMANIO +1inventors
InventorsFrancois-Xavier HOCHE, Véronique SMANIO, Fares HADDAD
Estimating the term…
A steel part for the transmission system of an automobile including the following elements, 0.2%≤C≤0.35%; 1.0%≤Mn≤1.6%; 0.2%≤Si≤0.7%; 0.001%≤Al≤0.1%; 0.01%≤Mo≤0.5%; 0.020%≤Nb≤0.06%; 1%≤Cr≤1.5%; 0≤P≤0.09%; 0≤S≤0.09%; 0.009%≤N≤0.09%; 0%≤Ni≤1%; 0%≤V≤0.2%; 0%≤Ti≤0.1%; 0%≤Cu≤1%; 0%≤B≤0.008%; 0%≤Sn≤0.1%; 0%≤Ce≤0.1%; 0%≤Mg≤0.10%; 0%≤Zr≤0.10%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the core of the steel part including, by area percentage, at least 90% of Bainite, with a cumulative optional presence of any one or more from Residual Austenite, Pearlite, ferrite or martensite from 0% and 10% and precipitates of Aluminum and Niobium in form of AlN and Nb (C,N), such steel part having a martensite-enriched layer until the depth of 1 mm or less on all surfaces of the steel part, such martensite-enriched layer including from 85% to 95% of martensite, the remainder being any one or more from bainite, residual austenite, ferrite or cementite.
1-15. (canceled)
A steel part for a transmission system of an automobile comprising the following composition, expressed in percentage by weight:
A method of production of a steel part for a transmission system of an automobile comprising the following successive steps:
Dependencies are inferred from the claim text.