High tensile hot rolled steel sheet excellent in shape...

Metal treatment – Stock – Ferrous

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C420S128000

Reexamination Certificate

active

10479773

ABSTRACT:
According to the invention, a high-strength hot rolled steel sheet having an excellent shape fixability as hot-rolled and an excellent fatigue durability after the forming, excellent weldability and phosphatability and a tensile strength of not less than 590 MPa level can be obtained by comprising C: not less than 0.02 mass % but not more than 0.2 mass %, Si: not less than 0.5 mass % but not more than 2.0 mass %, Mn: not less than 1.0 mass % but not more than 3.0 mass %, Al: not less than 0.01 mass % but not more than 0.1 mass %, N: not less than 0.002 mass % but not more than 0.006 mass %, P: not more than 0.03 mass %, S: not more than 0.01 mass % and solid-soluted (C+N): not less than 0.0010 mass % and the reminder being Fe and inevitable impurities, and having a steel structure that a primary phase is ferrite and a secondary phase is martensite phase of 5-30 % at a volume ratio and a total of both is not less than 95 % as a volume ratio, and further having an average crystal grain size of ferrite of not more than 8 μm.

REFERENCES:
patent: 4502897 (1985-03-01), Morita et al.
patent: 6425963 (2002-07-01), Kaneko et al.
patent: 1263168 (2000-08-01), None
patent: 410053837 (1998-02-01), None
patent: 11350064 (1999-12-01), None
patent: 2000 297349 (2000-10-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

High tensile hot rolled steel sheet excellent in shape... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High tensile hot rolled steel sheet excellent in shape..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High tensile hot rolled steel sheet excellent in shape... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3939034

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.