EP 0183536 B1 19890830 - NON-MAGNETIC STEEL HAVING HIGH CORROSION RESISTANCE AND HIGH STRENGTH FOR USE AS MATERIAL OF DRILL COLLAR, AND DRILL COLLAR MADE OF THE STEEL
Title (en)
NON-MAGNETIC STEEL HAVING HIGH CORROSION RESISTANCE AND HIGH STRENGTH FOR USE AS MATERIAL OF DRILL COLLAR, AND DRILL COLLAR MADE OF THE STEEL
Publication
Application
Priority
JP 25190884 A 19841130
Abstract (en)
[origin: EP0183536A2] A non-magnetic steel alloy having high corrosion resistance and high strength suitable for use as the material of a drill collar which operates under corrosive conditions, particularly under the conditions which cause stress corrosion cracking, and a drill collar made of the steel alloy. The steel alloy has a composition which essentially consists of: not greater than 0.02% of C, not greater than 2.0% of Si, not greater than 2.0% of Mn, 25 to 40% of Ni, 18 to 30% of Cr, 0.1 to 1.5% of A1, 1.5 to 3.0% of Ti, 0.0005 to 0.020% of Ca, not greater than 0.020% of N and the balance Fe and incidental impurities, and a drill collar made of the steel.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C22C 30/00 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); E21B 17/16 (2006.01); H01F 1/00 (2006.01); E21B 47/022 (2006.01)
CPC (source: EP)
C22C 38/48 (2013.01); E21B 17/16 (2013.01)
Designated contracting state (EPC)
AT DE FR GB
DOCDB simple family (publication)
EP 0183536 A2 19860604; EP 0183536 A3 19870513; EP 0183536 B1 19890830; AT E45991 T1 19890915; DE 3572696 D1 19891005; JP H0218381 B2 19900425; JP S61130464 A 19860618
DOCDB simple family (application)
EP 85308615 A 19851127; AT 85308615 T 19851127; DE 3572696 T 19851127; JP 25190884 A 19841130