Method of production of 780 MPa class high strength steel...

Details Method of production of 780 MPa class high strength steel... Method of production of 780 MPa class high strength steel...

2011-04-05

2011-04-05

Yee, Deborah (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S654000, C148S663000, C148S506000, C148S505000

Reexamination Certificate

active

07918948

ABSTRACT:
A method of production of 780 MPa class high strength steel plate excellent low temperature toughness comprising heating a steel slab of containing, by mass %, C: 0.06 to 0.15%, Si: 0.05 to 0.35%, Mn: 0.60 to 2.00%, P: 0.015% or less, S: 0.015% or less, Cu: 0.1 to 0.5%, Ni: 0.1 to 1.5%, Cr: 0.05 to 0.8%, Mo: 0.05 to 0.6%, Nb: less than 0.005%, V: 0.005 to 0.060%, Ti: less than 0.003%, Al: 0.02 to 0.10%, B: 0.0005 to 0.003%, and N: 0.002 to 0.006% to 1050° C. to 1200° C. in temperature, hot rolling ending at 870° C. or more, waiting for 10 seconds to 90 seconds, then cooling from 840° C. or more in temperature by a 5° C./s or more cooling rate to 200° C., then tempering at 450° C. to 650° C. in temperature for 20 minutes to 60 minutes.

REFERENCES:
patent: 3-44417 (1991-02-01), None
patent: 5-9570 (1993-01-01), None
patent: 06-240355 (1994-08-01), None
patent: 2000-008135 (2000-01-01), None
patent: 2007-138203 (2007-06-01), None
patent: 2007-146220 (2007-06-01), None
Machine-English translation of Japanese patent 08-283899, Tokuno Kazunari et al., Oct. 29, 1996.
International Search Report dated Jul. 21, 2009 issued in corresponding PCT Application No. PCT/JP2009/057295.

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