Metal treatment – Stock – Carburized or nitrided
Patent
1998-07-09
2000-07-18
Yee, Deborah
Metal treatment
Stock
Carburized or nitrided
148225, 148218, C22C 3822, C23C 822, C23C 832
Patent
active
060902256
ABSTRACT:
Process for manufacturing a mechanical component made of steel, in which a blank of the steel component is manufactured and a high-temperature carburizing or carbonitriding treatment of at least part of the surface of the blank of the component is carried out, the chemical composition of the steel of which the component is composed comprises, by weight: 0.15%.ltoreq.C.ltoreq.0.35%; 0%.ltoreq.Si.ltoreq.0.6%; 0%.ltoreq.Mn+Cr+Ni+Mo.ltoreq.5%; 0%.ltoreq.Al.ltoreq.0.1%; 0%.ltoreq.Cu.ltoreq.0.5%; 0%.ltoreq.Ti.ltoreq.0.05%; 0.004%.ltoreq.N.ltoreq.0.02%; 0%.ltoreq.S.ltoreq.0.15%; P.ltoreq.0.03%; optionally, up to 0.02% tellurium, up to 0.04% selenium, up to 0.07% lead, up to 0.005% calcium, the balance being iron and impurities resulting from the smelting; the chemical composition being adjusted so that the Jominy curve of the steel is such that: 45 HRC.ltoreq.J.sub.3 .ltoreq.50 HRC; 39 HRC.ltoreq.J.sub.11 .ltoreq.47 HRC; 31 HRC.ltoreq.J.sub.25 .ltoreq.40 HRC; the average values J.sub.3m, J.sub.11m and J.sub.25m of five Jominy tests are such that: .vertline.J.sub.11m -J.sub.3m .times.14/22-J.sub.25m .times.8/22.vertline..ltoreq.2.5 HRC and J.sub.3m -J.sub.15m .ltoreq.9 HRC. Carburizing or carbonitriding steel for manufacturing this component.
Ascometal (Societe Anonyme)
Yee Deborah
LandOfFree
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