EP 0178334 A1 19860423 - Martensitic stainless steels for seamless steel pipe.
Title (en)
Martensitic stainless steels for seamless steel pipe.
Title (de)
Rostfreie martensitische Stähle für nahtlose Rohre.
Title (fr)
Aciers inoxydables martensiques pour tubes d'acier sans soudure.
Publication
Application
Priority
EP 84112233 A 19841011
Abstract (en)
Martensitic stainless steels that enable the fabrication of high-strength seamless steel pipe suited for use in oil-well pipe and pipeline tubing by means of a Mannesmann plug mill or Mannesmann mandrel mill process, without the formation of defects during production. The heat workability of these steels, which contain no more than 0.30% by weight of carbon and from 11 to 14% by weight of chromium, and have a ferrite content of a least 40% at 1200 DEG C, has been vastly improved by holding the phosphorus and sulfur levels therein to no more than 0.020% and 0.003% by weight, respectively. Optional elements are nickel, copper, molydenum, columbium, vanadium, calcium and rare elements. Boron may be present from 0.001 to 0.008 % by weight, aluminium from 0.005 to 0.10 % by weight.
IPC 1-7
IPC 8 full level
C22C 38/18 (2006.01); C22C 38/38 (2006.01)
CPC (source: EP)
C22C 38/18 (2013.01); C22C 38/38 (2013.01)
Citation (search report)
- [Y] GB 2027745 A 19800227 - KAWASAKI STEEL CO
- [Y] GB 1336698 A 19731107 - SONY CORP
- [A] GB 1221584 A 19710203 - UDDEHOLMS AB [SE]
- [A] AT 345322 B 19780911 - SUEDWESTFALEN AG STAHLWERKE [DE]
- [A] SU 498357 A1 19760105
- [A] EP 0081592 A1 19830622 - KAWASAKI STEEL CO [JP]
- [AD] C.W.WEGST: "STAHLSCHLÜSSEL", 1983, Edition 13, page 324, Verlag Stahlschlüssel Wegst GmbH, Marbach, DE;
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
EP 0178334 A1 19860423; EP 0178334 B1 19900718; DE 3482772 D1 19900823
DOCDB simple family (application)
EP 84112233 A 19841011; DE 3482772 T 19841011