Free-cutting steel with improved machinability

Non-alloy free-cutting steel with sulphur contents in the range from 0.1% to 0.4% in weight (limiting values included), the sulphur being in the form of spheroidal sulphides with values of the spheroidisation index and shape factor within defined limits. An addition of from 0.05% to 0.30% in weight...

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Bibliographic Details
Main Authors FOLGARAIT, PAOLO, CHIOATTO, GIANFRANCO
Format Patent
LanguageEnglish
French
German
Published 02.06.1999
Edition6
Subjects
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:Non-alloy free-cutting steel with sulphur contents in the range from 0.1% to 0.4% in weight (limiting values included), the sulphur being in the form of spheroidal sulphides with values of the spheroidisation index and shape factor within defined limits. An addition of from 0.05% to 0.30% in weight (limiting values included) of bismuth, as an element and/or an alloy and/or as a mixture with one or more elements insoluble in liquid steel or having spheroidizing effects on sulphides, to a free-cutting steel containing spheroidal sulphides with well-defined characteristics, as described above, improves machinability substantially with respect to the present state of the art. In quantitative terms this improvement in machinability increases cutting tool life up to 30% for the same cutting parameters and conditions.
Bibliography:Application Number: EP19980203028