EP 1054074 A2 20001122 - A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor
Title (en)
A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor
Title (de)
Wismut und Schwefel enthaltenden zerspanbaren Stahl mit ausgezeichneter Dehnbarkeit bei hohen Temperaturen und Herstellungsverfahren dafür
Title (fr)
Acier de decolletage contenant du bismuth et du soufre et présentant de ductilité excellent à haut température, et son procédé de fabrication
Publication
Application
Priority
EP 99303965 A 19990521
Abstract (en)
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.
IPC 1-7
IPC 8 full level
C21D 8/06 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP)
C21D 8/06 (2013.01); C22C 38/002 (2013.01); C22C 38/04 (2013.01); C22C 38/60 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 99303965 A 19990521