EP 0035091 B1 19850410 - PROCESS FOR PRODUCING TENSION-CRACK CORROSION-RESISTANT NON MAGNETIZABLE DRILL COLLARS OF AUSTENITIC STEELS, AND APPARATUS FOR CARRYING OUT THIS PROCESS
Title (en)
PROCESS FOR PRODUCING TENSION-CRACK CORROSION-RESISTANT NON MAGNETIZABLE DRILL COLLARS OF AUSTENITIC STEELS, AND APPARATUS FOR CARRYING OUT THIS PROCESS
Publication
Application
Priority
AT 40580 A 19800125
Abstract (en)
[origin: EP0035091A1] 1. A method of manufacturing stress-corrosion-resistant non-magnetizable drill-stems made of austentic steels, characterized in that in the surface region of the drill-stems residual compressive stresses are produced by the effect of mechanically, electrically, or chemically released impact or compression energy.
IPC 1-7
IPC 8 full level
C21D 7/04 (2006.01); C21D 10/00 (2006.01)
CPC (source: EP)
C21D 7/04 (2013.01); C21D 10/00 (2013.01)
Citation (examination)
- DE 1227491 B 19661027 - KRUPP AG HUETTENWERKE
- FR 800143 A 19360627 - STANDARD OIL DEV CO
- DE 324509 C 19200830 - DIAMOND BLOWER COMPANY LTD
- DE 1049197 C
- GB 1054979 A
- US 3610008 A 19711005 - FOEDISCH ALFRED K
- US 3648510 A 19720314 - GARDNER NEWELL JOHN
- AT 214466 B 19610410 - SCHOELLER BLECKMANN STAHLWERKE
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0035091 A1 19810909; EP 0035091 B1 19850410; AT 364592 B 19811027; AT A40580 A 19810315; DE 3070489 D1 19850515
DOCDB simple family (application)
EP 80890152 A 19801219; AT 40580 A 19800125; DE 3070489 T 19801219