Method of improving the toughness of low-carbon,...

Details Method of improving the toughness of low-carbon,... Method of improving the toughness of low-carbon,...

2005-03-08

2005-03-08

Yee, Deborah (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

C148S547000, C148S660000, C148S664000, C148S654000

Reexamination Certificate

active

06863749

ABSTRACT:
A method of post-solidification processing to minimize the content of extremely coarse grain-refining precipitates that may form during solidification is low-alloy and alloy high-strength steels containing approximately 0.09-0.17% by weight C so as to provide improved toughness in a wrought and heat-treated product. The method entails cooling an as-cast steel at a reduced rate in a furnace held at a temperature in excess of the equilibrium solution temperature for AlN in austenite. The steel is maintained at this temperature for a sufficient amount of time to effect the dissolution of coarse AlN precipitates in the microstructure, and the so-treated steel is then cooled at any desired rate to room temperature or to a hot-rolling temperature.

REFERENCES:
patent: 4092178 (1978-05-01), Onoe et al.
patent: 4634573 (1987-01-01), Yanagiya et al.
patent: 5409554 (1995-04-01), Leap
patent: 0 900 850 (1999-03-01), None
patent: (1985) 60-159155 (1985-08-01), None
patent: WO 9850594 (1998-11-01), None
Leap, Michael J. et al., “How to Make Strong Steel Tougher”,Advanced Materials&Processes,8/97, 4 pp.
Patent Abstracts of Japan, JP 01-092320 published Nov. 04, 1989, Applicant Kawasaki Steel Corp, entitled “Improvement of Toughness of Joint of High Tension Steel Subjected to Flash Butt Welding”.

Affiliated with

Also associated with

Rating

Method of improving the toughness of low-carbon,... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of improving the toughness of low-carbon,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of improving the toughness of low-carbon,... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3369983