Highly cleaned steel

The present invention provides a super-clean steel excellent in cold workability and fatigue properties even with a reduced use of Ca and Mg ferroalloys, characterized in that, among the non-metallic inclusions with their length (1) and width (d) satisfying the relation 1/d </= 5 at an L section...

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Bibliographic Details
Main Authors YAMADA WATARU, SUGIMARU SATOSHI, NISHIDA SEIKI
Format Patent
LanguageEnglish
Published 19.09.2001
Edition7
Subjects
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:The present invention provides a super-clean steel excellent in cold workability and fatigue properties even with a reduced use of Ca and Mg ferroalloys, characterized in that, among the non-metallic inclusions with their length (1) and width (d) satisfying the relation 1/d </= 5 at an L section of a rolled steel material, the number of inclusions having the composition A1 specified below accounts for 20% or more, and the total number of inclusions having the composition A1 or B1 specified below accounts for 80% or more, and that, regarding the non-metallic inclusions satisfying the relation 1/d </= 5 and having the composition A1 specified below, d is 40 mu m or less. Composition A1: containing over 60% of SiO2. Composition B1: containing one or both of 50% or less of CaO and 15% or less of MgO, in addition to 20 to 60% of SiO2 and 10 to 80% of MnO.
Bibliography:Application Number: CN20008001137