EP 1553201 A1 20050713 - STEEL FOR MACHINE STRUCTURAL USE EXCELLENT IN FRIABILITY OF CHIPS
Title (en)
STEEL FOR MACHINE STRUCTURAL USE EXCELLENT IN FRIABILITY OF CHIPS
Title (de)
STAHL FÜR MASCHINENBAUZWECKE MIT HERVORRAGENDER ZERSPANBARKEIT
Title (fr)
ACIER POUR STRUCTURE DE MACHINE AVEC TRES BONNE FRIABILITE DES EBARBURES
Publication
Application
Priority
- JP 0310029 W 20030806
- JP 2002232425 A 20020809
Abstract (en)
Disclosed is a free cutting steel for machine structural use having excellent chip-breakability. The steel consists essentially of, by wt.%, C: 0.05-0.8%, Si: 0.01-2.5%, Mn: 0.1-3.5%, S: 0.01-0.2%, Ca or Ca+Mg: 0.0005-0.02%, Ti:0.002-0.010% and/or Zr: 0.002-0.025%, O: 0.0005-0.010%, and the balance of impurities and Fe. At least five MnS inclusion particles having averaged particles sizes of 1.0 mu m or more exists per mm<2> per 0.01% of S-content in the steel. The steel satisfies the condition that, in the microscopic fields, (areaÄ mu m<2>Ü/aspect ratio)>/=10, and that the the area percentage of Ca-containing sulfide inclusions containing at least 1.0wt.% of Ca is in the range of 15-40% of the area of all the sulfide inclusions. <IMAGE>
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/14 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP US)
C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/18 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/60 (2013.01 - EP US); C21D 2211/004 (2013.01 - EP US); C21D 2261/00 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
US 2005265886 A1 20051201; EP 1553201 A1 20050713; EP 1553201 A4 20051005; JP 2004068128 A 20040304; WO 2004015155 A1 20040219
DOCDB simple family (application)
US 52399005 A 20050209; EP 03784554 A 20030806; JP 0310029 W 20030806; JP 2002232425 A 20020809