Global Patent Index - EP 1550736 A4

EP 1550736 A4 20050706 - CARBURIZED AND QUENCHED MEMBER AND METHOD FOR PRODUCTION THEREOF

Title (en)

CARBURIZED AND QUENCHED MEMBER AND METHOD FOR PRODUCTION THEREOF

Title (de)

AUFGEKOHLTES UND ABGESCHRECKTES ELEMENT UND VERFAHREN ZU SEINER HERSTELLUNG

Title (fr)

ELEMENT CARBURE ET TREMPE ET SON PROCEDE DE PRODUCTION

Publication

EP 1550736 A4 20050706 (EN)

Application

EP 02790874 A 20021225

Priority

  • JP 0213561 W 20021225
  • JP 2001392410 A 20011225

Abstract (en)

[origin: EP1550736A1] Provided are a carburized and hardened member that allows strength enhancement while sufficiently reducing the hardening strain, without increasing the production cost, and a production method for the carburized and hardened member. An alloy steel which contains Fe as a main component and contains 0.10 to 0.50 wt.% of C and 0.50 to 1.50 wt.% of Si and whose hardenability J based on an end quenching test is in a range of 35 to 50 (at 12.5 mm) is used as a raw material. After the material is formed into a member of a desired shape, a carburized layer is formed by performing a carburizing process in an oxidation inhibitive atmosphere. After the carburizing process, a quenching process is performed in a condition that cooling is monotonously performed from a pearlite transformation point (A1 point) to a martensite transformation start point (Ms point), and a condition that a severity of quenching H is in a range of 0.01 to 0.08 (cm<-1>). <IMAGE>

IPC 1-7

C23C 8/22; C21D 1/06; C21D 9/32

IPC 8 full level

C23C 8/22 (2006.01); C23C 8/80 (2006.01)

CPC (source: EP KR US)

C23C 8/22 (2013.01 - EP KR US); C23C 8/80 (2013.01 - EP US)

Citation (search report)

  • [Y] US 5853502 A 19981229 - AIHARA KENJI [JP], et al
  • [XY] PATENT ABSTRACTS OF JAPAN vol. 014, no. 559 (C - 0787) 12 December 1990 (1990-12-12)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 01 30 January 1998 (1998-01-30)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 2000, no. 13 5 February 2001 (2001-02-05)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 03 27 February 1998 (1998-02-27)
  • [A] LAMPMAN S.R., ZORC T.B.: "ASM HANDBOOK VOL. 4", August 2001, ASM INTERNATIONAL, UNITED STATES OF AMERICA, XP002309648
  • See references of WO 03056054A1

Designated contracting state (EPC)

BE FR GB

DOCDB simple family (publication)

EP 1550736 A1 20050706; EP 1550736 A4 20050706; CN 1539026 A 20041020; JP 4354277 B2 20091028; JP WO2003056054 A1 20050512; KR 20040088016 A 20041015; US 2005173026 A1 20050811; WO 03056054 A1 20030710

DOCDB simple family (application)

EP 02790874 A 20021225; CN 02808875 A 20021225; JP 0213561 W 20021225; JP 2003556568 A 20021225; KR 20047002801 A 20021225; US 47371604 A 20040427