High-strength/high toughness alloy steel drill bit blank

Boring or penetrating the earth – Bit or bit element – Specific or diverse material

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C076S108200

Reexamination Certificate

active

11435413

ABSTRACT:
Drill bit reinforcing members or blanks of this invention are formed from high-strength steels having a carbon content less than about 0.3 percent by weight, a yield strength of at least 55,000 psi, a tensile strength of at least 80,000 psi, a toughness of at least 40 CVN-L, Ft-lb, and a rate of expansion percentage change less than about 0.0025%/° F. during austenitic to ferritic phase transformation. In one embodiment, such steel comprises in the range of from about 0.1 to 0.3 percent by weight carbon, 0.5 to 1.5 percent by weight manganese, up to about 0.8 percent by weight chromium, 0.05 to 4 percent by weight nickel, and 0.02 to 0.8 percent by weight molybdenum. In another example, such steel comprises in the range of from about 0.1 to 0.3 percent by weight carbon, 0.9 to 1.5 percent by weight manganese, 0.1 to 0.5 percent by weight silicon, and one or more microalloying element selected from the group consisting of vanadium, niobium, titanium, zirconium, aluminum and mixtures thereof.

REFERENCES:
patent: 3661656 (1972-05-01), Jarleborg
patent: 3757878 (1973-09-01), Wilder et al.
patent: 3842921 (1974-10-01), Dill et al.
patent: 3885838 (1975-05-01), Childers et al.
patent: 3946817 (1976-03-01), Prince
patent: 4188242 (1980-02-01), Scales
patent: 4303137 (1981-12-01), Fischer
patent: 4333364 (1982-06-01), Varel
patent: 4358317 (1982-11-01), Abe
patent: 4597456 (1986-07-01), Ecer
patent: 4643051 (1987-02-01), Simons et al.
patent: 4726432 (1988-02-01), Scott et al.
patent: 4867015 (1989-09-01), Kane et al.
patent: 4969378 (1990-11-01), Lu et al.
patent: 5033559 (1991-07-01), Fischer
patent: 6148936 (2000-11-01), Evans et al.
patent: 6287360 (2001-09-01), Kembaiyan et al.
patent: 6354740 (2002-03-01), Singh et al.
patent: 6375706 (2002-04-01), Kembaiyan et al.
patent: 7044243 (2006-05-01), Kembaiyan et al.

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-strength/high toughness alloy steel drill bit blank 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-strength/high toughness alloy steel drill bit blank, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-strength/high toughness alloy steel drill bit blank will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3914438

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