EP 2006398 A1 20081224 - PROCESS FOR PRODUCING STEEL MATERIAL
Title (en)
PROCESS FOR PRODUCING STEEL MATERIAL
Title (de)
HERSTELLUNGSVERFAHREN FÜR STAHLMATERIAL
Title (fr)
PROCÉDÉ DE FABRICATION D'UN ACIER
Publication
Application
Priority
- JP 2007057910 W 20070410
- JP 2006108174 A 20060411
- JP 2006313747 A 20061121
Abstract (en)
A process for producing a steel material which includes 30-minute or longer holding at the pearlite nose transformation completion point. In the process for steel material production, process annealing (3) is conducted between preceding-step hot working (1) and subsequent-step hot working. In the process annealing (3), a semi-product steel material (4) after completion of the preceding-step hot working is introduced into a heat-maintaining tank (7) to cause the steel material to recuperate heat and the semi-product steel material is kept for 30 minutes or longer at a temperature in the range of (pearlite nose transformation completion point) ±20°C by means of the transformation latent heat thereof to thereby transform the semi-product steel material into pearlite. Preferably, the semi-product steel material introduced into the heat-maintaining tank is kept for 2 hours or longer at a temperature in the range of (pearlite nose transformation completion point) ±20°C. The steel material can be regulated so as to have a hardness after the process annealing of 300 HB or lower.
IPC 8 full level
C21D 9/00 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR)
C21D 1/26 (2013.01 - EP); C21D 6/002 (2013.01 - EP); C21D 8/02 (2013.01 - KR); C21D 8/0263 (2013.01 - EP); C21D 9/00 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2006398 A1 20081224; EP 2006398 A4 20130619; EP 2006398 B1 20141217; CN 101421424 A 20090429; CN 101421424 B 20101208; JP 5088633 B2 20121205; JP WO2007119722 A1 20090827; KR 101074297 B1 20111017; KR 20080112287 A 20081224; WO 2007119722 A1 20071025
DOCDB simple family (application)
EP 07741346 A 20070410; CN 200780012821 A 20070410; JP 2007057910 W 20070410; JP 2008510952 A 20070410; KR 20087024856 A 20070410