Global Patent Index - EP 0890653 A1

EP 0890653 A1 19990113 - Process for manufacturing of articles from carburized or carbonitrided steel and steel for the manufacturing of said articles

Title (en)

Process for manufacturing of articles from carburized or carbonitrided steel and steel for the manufacturing of said articles

Title (de)

Herstellungsverfahren für Bauteile aus zementierter oder carbonitrierter Stahl und Stahl für die Herstellung dieser Bauteile

Title (fr)

Procédé de fabrication d'une pièce en acier cementée ou carbonitrurée et acier pour la fabrication de cette pièce

Publication

EP 0890653 A1 19990113 (FR)

Application

EP 98400447 A 19980225

Priority

FR 9708770 A 19970710

Abstract (en)

A novel carburising or carbonitriding steel has the composition (by wt.) 0.2-0.26% C, 0.05-0.5% Si, 1 to less than 1.6% Mn, 0.4-1.5% Cr, 0.08 to less than 0.27% Mo, 0 to less than 0.6% Ni, 0.003-0.06% Al, 0-0.3% Cu, 0-0.1% S, less than 0.03% P, optionally up to 0.02% Te, up to 0.04% Se, up to 0.07% Pb and up to 0.005% Ca, balance Fe and impurities. Also claimed is a process for manufacturing a mechanical steel part by subjecting a rough steel part to surface carburising or carbonitriding, the steel having (a) the composition (by wt.) 0.15-0.35% C, 0-0.6% Si, 0 to less than 5% Mn + Cr + Ni + Mo, 0-0.1% Al, 0 to less than 0.5% Cu, 0-0.15% S, less than 0.03% P, optionally up to 0.02% Te, up to 0.04% Se, up to 0.07% Pb and up to 0.005% Ca, balance Fe and impurities; (b) a Jominy curve in which J3 = 45-50 HRC, J11 = 39-47 HRC and J25 = 31-40 HRC; and (c) average values J3m, J11m, J15m and J25m of five Jominy tests such that MOD(J11m - J3m x 13 divided by 22 - J25m x 8 divided by 22) = ≤ 2.5 HRC and J3m - J15m = ≤ 9 HRC.

Abstract (fr)

Procédé de fabrication d'une pièce de mécanique en acier selon lequel on fabrique une ébauche de pièce en acier et on effectue un traitement de cémentation ou de carbonitruration à haute température d'au moins une partie de la surface de l'ébauche de la pièce, la composition chimique de l'acier dont est constitué la pièce comprenant, en poids : 0,15 % <= C <= 0,35 % ; 0 % <= Si <= 0,6 % ; 0 % <= Mn + Cr + Ni + Mo < 5 % ; 0 % <= Al <= 0,1 % ; 0 % <= Cu <= 0,5 % ; 0 % <= Ti <= 0,05 % ; 0,004 % <= N <= 0,02 % ; 0 % <= S <= 0,15 % ; P <= 0,03 % ; éventuellement, jusqu'à 0,02 % de tellure, jusqu'à 0,04 % de sélénium, jusqu'à 0,07 % de plomb, jusqu'à 0,005 % de calcium, le reste étant du fer et des impuretés résultant de l'élaboration ; la composition chimique étant ajustée pour que la courbe JOMINY de l'acier soit telle que : 45 HRC <= J3 <= 50 HRC ; 39 HRC <= J11 <= 47 HRC ; 31 HRC <= J25 <= 40 HRC ; les valeurs moyennes J3m, J11m et J25m de cinq essais JOMINY étant telles que : |J11m - J3m x 14 /22 - J25m x 8 / 22| <= 2,5 HRC et J3m - J15m <= 9 HRC. Acier de cémentation ou de carbonitruration pour fabriquer cette pièce.

IPC 1-7

C22C 38/00

IPC 8 full level

C21D 1/06 (2006.01); C23C 8/22 (2006.01); C21D 1/55 (2006.01); C21D 1/78 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/18 (2006.01); C22C 38/60 (2006.01); C23C 8/26 (2006.01); C23C 8/30 (2006.01); C23C 8/32 (2006.01)

CPC (source: EP US)

C22C 38/00 (2013.01 - EP US)

Citation (search report)

  • [Y] PATENT ABSTRACTS OF JAPAN vol. 97, no. 006 30 June 1997 (1997-06-30)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 95, no. 007 31 August 1995 (1995-08-31)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 12, no. 082 (C - 481) 15 March 1988 (1988-03-15)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 12, no. 082 (C - 481) 15 March 1988 (1988-03-15)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 10, no. 269 (C - 372) 12 September 1986 (1986-09-12)

Designated contracting state (EPC)

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

DOCDB simple family (publication)

EP 0890653 A1 19990113; EP 0890653 B1 20030813; AR 013198 A1 20001213; AT E247179 T1 20030815; AU 7394398 A 19990121; AU 744729 B2 20020228; BR 9802358 A 20001017; CA 2243101 A1 19990110; CA 2243101 C 20090324; CN 1079446 C 20020220; CN 1211632 A 19990324; CZ 213898 A3 19990113; CZ 297683 B6 20070307; DE 69817098 D1 20030918; DE 69817098 T2 20040401; DE 890653 T1 19990602; DK 0890653 T3 20031201; ES 2126546 T1 19990401; ES 2126546 T3 20040501; FR 2765890 A1 19990115; FR 2765890 B1 19990820; HU 9801540 D0 19980928; HU P9801540 A1 19990528; JP 3656706 B2 20050608; JP H1171613 A 19990316; PL 190892 B1 20060228; PL 327388 A1 19990118; PT 890653 E 20031231; RO 118457 B1 20030530; RU 2201993 C2 20030410; SI 9800193 A 19990430; TR 199801347 A2 19991021; TR 199801347 A3 19991021; TW 460593 B 20011021; UA 58499 C2 20030815; US 6090225 A 20000718; ZA 986061 B 19990201

DOCDB simple family (application)

EP 98400447 A 19980225; AR P980103368 A 19980710; AT 98400447 T 19980225; AU 7394398 A 19980630; BR 9802358 A 19980708; CA 2243101 A 19980709; CN 98117414 A 19980709; CZ 213898 A 19980703; DE 69817098 T 19980225; DE 98400447 T 19980225; DK 98400447 T 19980225; ES 98400447 T 19980225; FR 9708770 A 19970710; HU P9801540 A 19980709; JP 19562998 A 19980710; PL 32738898 A 19980710; PT 98400447 T 19980225; RO 9801160 A 19980709; RU 98113918 A 19980709; SI 9800193 A 19980710; TR 9801347 A 19980710; TW 87110443 A 19980629; UA 98073600 A 19980707; US 11205798 A 19980709; ZA 986061 A 19980709