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EP-1054074-A2-20001122
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"EP1054074"; "EP 1054074"; "C22C 38/04"; "A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor"
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EP-1054074-A2-20001122
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A bismuth-sulfuric (to be called "Bi-S" below) free-machinable steel showing a superior high temperature ductility, and a manufacturing method therefor, are disclosed, in which surface defects do not occur at a low rolling temperature. The Bi-S free-machinable steel with a superior high temperature ductility includes: in wt%, 0.05-0.15% of C, 0.5-2.0% of Mn, 0.15-0.40% of S, 0.01-0.10% of P, 0.003-0.020% of O, 0.03-0.30% of Bi, 0.01% or less of Si, 0.0009% or less of Al, and a balance of Fe and other unavoidable impurities; an MnS inclusion with MnS and Bi absorbed into it; and a metallic Bi inclusion. In another aspect, the free machinable steel includes 0.02-0.1% of Ti and 0.0030-0.0100% of N in addition to the above elements. In still another aspect, the free machinable steel includes 0.0050-0.0150% of B and 0.0070% or less of N in addition to the above elements.
A bismuth-sulfuric (to be called "Bi-S" below) free-machinable steel showing a superior high temperature ductility, and a manufacturing method therefor, are disclosed, in which surface defects do not occur at a low rolling temperature. The Bi-S free-machinable steel with a superior high temperature ductility includes: in wt%, 0.05-0.15% of C, 0.5-2.0% of Mn, 0.15-0.40% of S, 0.01-0.10% of P, 0.003-0.020% of O, 0.03-0.30% of Bi, 0.01% or less of Si, 0.0009% or less of Al, and a balance of Fe and other unavoidable impurities; an MnS inclusion with MnS and Bi absorbed into it; and a metallic Bi inclusion. In another aspect, the free machinable steel includes 0.02-0.1% of Ti and 0.0030-0.0100% of N in addition to the above elements. In still another aspect, the free machinable steel includes 0.0050-0.0150% of B and 0.0070% or less of N in addition to the above elements.
en
European Patent Office
EP1054074
EP 1054074
C22C 38/04
A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor
A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor - European Patent Office - EP 1054074 A2
A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor - European Patent Office - EP 1054074 A2
EUROPEAN PATENT APPLICATION
11
EP
1054074
A2
2000-11-22
99303965.0
1999-05-21
C22C 38/04 A
POHANG IRON & STEEL CO., LTD.
Cho, Sam Kyo
Powell, Timothy John et al
A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor
Wismut und Schwefel enthaltenden zerspanbaren Stahl mit ausgezeichneter Dehnbarkeit bei hohen Temperaturen und Herstellungsverfahren dafür
A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor
Acier de decolletage contenant du bismuth et du soufre et présentant de ductilité excellent à haut température, et son procédé de fabrication
A bismuth-sulfuric (to be called "Bi-S" below) free-machinable steel showing a superior high temperature ductility, and a manufacturing method therefor, are disclosed, in which surface defects do not occur at a low rolling temperature. The Bi-S free-machinable steel with a superior high temperature ductility includes: in wt%, 0.05-0.15% of C, 0.5-2.0% of Mn, 0.15-0.40% of S, 0.01-0.10% of P, 0.003-0.020% of O, 0.03-0.30% of Bi, 0.01% or less of Si, 0.0009% or less of Al, and a balance of Fe and other unavoidable impurities; an MnS inclusion with MnS and Bi absorbed into it; and a metallic Bi inclusion. In another aspect, the free machinable steel includes 0.02-0.1% of Ti and 0.0030-0.0100% of N in addition to the above elements. In still another aspect, the free machinable steel includes 0.0050-0.0150% of B and 0.0070% or less of N in addition to the above elements.
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