Global Patent Index - EP 0512254 B2

EP 0512254 B2 2000-01-19 - Process for uniform thermochemical treatment of steel pieces having difficult accessible areas

Title (en)

Process for uniform thermochemical treatment of steel pieces having difficult accessible areas

Title (de)

Verfahren zur gleichmässigen thermochemischen Behandlung von Bauteilen aus Stahl, die schwer zugängliche Flächen aufweisen

Title (fr)

Procédé pour le traitement thermochimique uniforme de pièces en acier ayant des surfaces d'accès difficle

Publication

EP 0512254 B2 (DE)

Application

EP 92105758 A

Priority

DE 4115135 A

Abstract (en)

[origin: CZ288263B6] Hollow bodies or holes in steel components are subjected to thermomechanical treatments above 450 deg.C with reactive gases, partic. ammonia with 5-95 vol.% N or a C-generating gas, pref. methane at 870-1000 deg.C, at gas pressures above 0.2 MPa. Pref. the treatment is carried out at constant pressure, between 0.2 MPa and 10 MPa, depending on furnace capability.

[origin: CZ288263B6] Carburization of steel structural parts having areas that are difficult accessible from outside, such as nozzle bodies is carried out by heat treatment in the presence of carbon-liberating gases at temperatures ranging from 870 to 1000 degC and pressures above 0.2 MPa.

IPC 1-7 (main, further and additional classification)

C23C 8/22

IPC 8 full level (invention and additional information)

C23C 8/20 (2006.01); C23C 8/22 (2006.01); C23C 8/26 (2006.01); F02M 61/16 (2006.01)

CPC (invention and additional information)

C23C 8/22 (2013.01); C23C 8/26 (2013.01); F02M 61/166 (2013.01)

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB GR IT LI LU NL SE

EPO simple patent family

DE 4115135 C1 19920227; AT 139579 T 19960715; CS 9201375 A3 19921216; CZ 288263 B6 20010516; DE 59206595 D1 19960725; EP 0512254 A2 19921111; EP 0512254 A3 19930324; EP 0512254 B1 19960619; EP 0512254 B2 20000119; ES 2088515 T3 19960816; ES 2088515 T5 20000501; HU 209457 B 19940628; HU 913870 D0 19920228; HU T61056 A 19921130; JP 3258071 B2 20020218; JP H05132753 A 19930528; PL 291528 A1 19921116; RU 2052535 C1 19960120; TW 223128 B 19940501

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