EP 0178334 B1 19900718 - MARTENSITIC STAINLESS STEELS FOR SEAMLESS STEEL PIPE
Title (en)
MARTENSITIC STAINLESS STEELS FOR SEAMLESS STEEL PIPE
Publication
Application
Priority
EP 84112233 A 19841011
Abstract (en)
[origin: EP0178334A1] 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)
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