EP 1352982 B1 20051005 - Stainless steel, method for manufacturing of stress cracking free workpieces and product made thereof
Title (en)
Stainless steel, method for manufacturing of stress cracking free workpieces and product made thereof
Title (de)
Nichtrostender Stahl, Verfahren zum Herstellen von spannungsrissfreien Formteilen und Formteil
Title (fr)
Acier inoxydable, procédé de fabrication de pièces sans fissuration de tension et pièce obtenue
Publication
Application
Priority
DE 10215598 A 20020410
Abstract (en)
[origin: EP1352982A2] Stainless steel having a structure with at least 15 vol.% ferrite and a balance of austenite contains alloying additions of chromium and manganese, and optionally nickel, silicon, molybdenum, aluminum and copper. Stainless steel having a structure with at least 15 vol.% ferrite and a balance of austenite comprises (in wt.%): 0.02-0.08 carbon (C), 0.1-0.5 nitrogen (N), 16.0-20.0 chromium (Cr), 6.0-12.0 manganese (Mn), at most 9.05 nickel (Ni), at most 3.0 silicon (Si), at most 3.0 molybdenum (Mo), at most 2.0 aluminum (Al), at most 3.0 copper (Cu) and a balance of iron (Fe) and impurities (where 1.3 less than t less than 1.8 and t = (%Cr + 2%Mo + 1.5%Si + 3%Al -5)/(0.3%Mn + %Ni + 0.5%Cu + 15(%C + %N) +2)). Md30 temperature of the austenitic phase is not more than -55degrees C (where Md30 (degrees C) = 413 - 462(%C + %N) - 9.2%Si - 8.1%Mn - 13.7%Cr - 9.5(%Ni + %Cu) - 18.5%Mo). An Independent claim is also included for a process for the production of crack-free molded parts made from the above stainless steel. Preferred Features: The stainless steel structure comprises not more than 40 vol.% ferrite.
IPC 1-7
IPC 8 full level
C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/22 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 38/44 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP)
C21D 8/0205 (2013.01); C22C 38/001 (2013.01); C22C 38/22 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C22C 38/44 (2013.01); C22C 38/58 (2013.01); C21D 8/0221 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
DOCDB simple family (publication)
EP 1352982 A2 20031015; EP 1352982 A3 20040107; EP 1352982 B1 20051005; AT E305986 T1 20051015; DE 10215598 A1 20031030; DE 50301283 D1 20060216; ES 2250773 T3 20060416
DOCDB simple family (application)
EP 03008317 A 20030410; AT 03008317 T 20030410; DE 10215598 A 20020410; DE 50301283 T 20030410; ES 03008317 T 20030410