US3842921A - Boronized drill bit cutters - Google Patents

Boronized drill bit cutters Download PDF

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Publication number
US3842921A
US3842921A US00387565A US38756573A US3842921A US 3842921 A US3842921 A US 3842921A US 00387565 A US00387565 A US 00387565A US 38756573 A US38756573 A US 38756573A US 3842921 A US3842921 A US 3842921A
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US
United States
Prior art keywords
case
boronized
carburized
cutter
teeth
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00387565A
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English (en)
Inventor
H Dill
S Scales
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hughes Tool Co
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Hughes Tool Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hughes Tool Co filed Critical Hughes Tool Co
Priority to US00387565A priority Critical patent/US3842921A/en
Priority to CA194,786A priority patent/CA1003817A/en
Priority to BR2517/74A priority patent/BR7402517A/pt
Priority to GB2208074A priority patent/GB1455951A/en
Priority to SE7409634A priority patent/SE397842B/xx
Priority to IT26006/74A priority patent/IT1017922B/it
Application granted granted Critical
Publication of US3842921A publication Critical patent/US3842921A/en
Assigned to HUGHES TOOL COMPANY - USA A CORP OF reassignment HUGHES TOOL COMPANY - USA A CORP OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HUGHES TOOL COMPANY
Assigned to HUGHES TOOL COMPANY reassignment HUGHES TOOL COMPANY CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE OCTOBER 11, 1988 (DELAWARE) Assignors: HUGHES TOOL COMPANY-USA, A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component

Definitions

  • BORONIZED DRILL BIT CUTTERS Inventors: Herbert C. Dill; Stanley R. Scales, both of Houston, Tex.
  • Felsman 5 7 ABSTRACT Disclosed herein is a cutter for an earth boring drill bit having selected exterior surface areas that are carburized, boronized, quenched and tempered for extreme surface hardness, with a strong, tough supporting base that resists deformation and minimizes fracturing of the brittle boronized case. This produces a wear resistant case which may be used as an improved substitute for hardfacing.
  • a typical hardfacing used on teeth and cutters is a composite material consisting essentially of an alloy steel matrix in which are dispersed particles of sintered tungsten carbide.
  • This composite material is applied by a welding process by which a steel tube filled with tungsten carbide particles and ferroalloys is heated to a temperature sufficient to melt the steel tube and to fuse the composite to the selected surfaces.
  • a strong metallugrical bond is created.
  • melting the metal of the tooth causes a weakening of the tooth, particularly under impact loads.
  • the subsequently described invention is directed primarily to a solution to this problem.
  • an exceptionally wear resistant case may be produced on surfaces such as teeth and cutters of an earth boring drill bit by carburizing these surfaces, boronizing the resulting carburized surfaces, hardening in a manner to protect the boronized case from decarburizing, and then tempering.
  • carburizing and boronizing to the requisite depths hardening in a manner to produce martensitic structure in the carburized case, and tempering to thereafter produce tempered martensite, a surface of extreme hardness results with a strong and tough supporting base.
  • This base minimizes fracturing of the brittle boronized case since it is resistant to deformation and provides a satisfactory support for the boronized case.
  • the resulting surface is sufficiently abrasion resistant to replace the hardfacing of the prior art. Tooth failure due to weakening as a result of the prior art hardfacing operation is thereby minimized.
  • FIG. 1 is a perspective view of an earth boring drill bit having in this instance cutters and teeth that receive the metallurgical treatment described herein.
  • FIG. 2 is a side elevation view of another type cutter used in an earth boring drill bit, such cutter having a gage surface, heel row, intermediate row and inner row of teeth to dislodge cuttings from a borehole bottom during drilling.
  • FIG. 3 is a fragmentary side elevation view, partially in section, showing a rotatable cutter mounted on suitable bearing means extending in cantilevered fashion from a drill bit leg or head section.
  • FIG. 4 is a fragmentary side elevation view, partially in section, of an alternate form of cutter and teeth used in drilling, such cutter teeth having the metallurgical treatment described herein.
  • the numeral 11 in the drawing designates a typical earth boring drill bit having a threaded shank 13 for attachment to a drill string member, nozzle means 15 for directing a flow of fluid toward a borehole bottom. and in this instance three depending legs or head sections 17 that each support a toothed, rotatable cutter 19.
  • FIG. 2 an alternate form of cutter which has the typical conical basic configuration, including a conical gage surface 21 extedning from the cone back face 23 to the heel row teeth 25.
  • the gage surface is formed with alternate areas of steel ribs 27 and bands 29 of a composite hardfacing material consisting essentially of an alloy steel matrix and particles of sintered or cemented tungsten carbide.
  • This particular cutter has an intermediate row 31 of teeth and an extreme inner row or spear point 33.
  • a cutter such as that shown in FIG. 2 is generally mounted on a leg or head section 17 (see FIG. 3) with a cantilevered shaft or hearing pin 35 that forms a bearing means on the interior of the cutter.
  • the particular bearing means illustrated is primarily of the antifriction type, having a row of roller bearings 37, a row of ball bearings 39, and two friction bearing means that utilize a bushing 41 and a thrust button 43.
  • FIG. 4 is shown an alternate form of rotatable cutter and bearing configuration in which the cone I9 has its heel row 25, intermediate row 31, and inner row 33 formed with wear resistant inserts or compacts, preferably constructed in the prior art of cemented tungsten carbide with a cobalt binder, and inserted with interference fit in matching holes drilled into the cone exterior.
  • the gage surface 21 has a row of gage packs 45 substituted for the hardfacing 29 used on the FIG. 2 type cone configuration.
  • the head section 17 and its cantilevered bearing pin 35 have a friction bearing 47 in place of the rollers 37 in the FIG. 3 embodiment, and in addition, have a row of ball bearings 39, and friction bearing means utilizing the bushing 41 and thrust button 43.
  • a seal means such as an o-ring 49 is placed in suitable groove means between the bearing pin 35 and cutter 19 to retain a lubricant within the bearing region.
  • This invention is best practiced through utilization of four method stepsz'carburizing, boronizing, hardening and tempering, each of which will be described separately by way of example.
  • the initial step in the method requires carburizing the rotatable cutter or selected areas.
  • One of the prior art carburizing methods may be used.
  • Gas carburizing is a well known art and is the preferred method. It is described on pp. 93-1 14 of Volume 2 of the 8th Edition of the Metals Handbook, "Heat Treating, Cleaning and Finishing (1964, American Society for Metals).
  • An example of the gas carburizing of a rotatable cutter made of A181. 4815 steel is as follows:
  • Carburizing temperature 1,700 F.
  • Carburizing time Nineteen hours at 1,700 F.
  • Carburizing atmosphere Generated endothermic gas enriched with methane to have a carbon potential of 1.35 percent carbon.
  • a typical analysis of the carburizing gas (atmosphere) is as follows:
  • Pack carburizing is another well known art that may be used. It is described on pp. 1 14-1 18 of Volume 2 of the Metals Handbook.
  • An example of pack carburizing ofa cutter made of A.1.S.I. 4815 steel is as follows: Carburizing compound (in which cutter is packed): Charcoal, 90 percent (6 to 14 mesh size), energized with about 4 percent BaCO and about 1.5 percent CaCO Carburizing temperature: l,700 F.
  • Carburizing time Nineteen hours at l,700 F.
  • Liquid carburizing is another well known art to the metals industry. It is described on pp. 133-145 of Volume 2 of the Metals Handbook. While not actually used for this invention, it is anticipated that nineteen hours at 1,700 F. in a salt bath containing about 6 16 percent sodium cyanide and 30-55 percent barium chloride would produce a satisfactory carburized case to a depth of about 0.090 inch.
  • the second step of the method of this invention is boronizing of the previously carburized exterior surface and teeth.
  • Pack boronizing is the preferred technique and is a relatively new art.
  • An example of boronizing the exterior surface of a carburized A.l.S.l. 4815 steel cutter is as follows: Compound: Boronizing powder was packed around the car burized bearing exterior surface. This powder was 90 percent finer than 150 mesh, had 40-80 percent 8 C, 2-40 percent graphite, l-4 percent KHCO with remainder up to 20 percent impurities. Boronizing temperature: 1,650 F. in a carburizing atmosphere. Boronizing time: 8 hours at temperature in a furnace with a carbon potential of 1.00 percent. This produced a boronized case depth of about 0.005 inch. Longer boronizing times and/or higher boronizing temperatures can be used for deeper boronized case depth, but a 0.001 to 0.010 inch deep boronized case has less tendency to crack or spall than a deeper case.
  • Gas boronizing is an alternate technique in the prior art. It is described in US. Pat. No. 2,494,267, Surface Hardening of Ferrous Metals," Schlesinger and Schaffer, Jan. 10, 1950. The method described utilizes gaseous diborane (B H at about 700 C (l,292 F).
  • Liquid boronizing is another prior art boronizing method. 1t is described in two papers: Boronizing of Steel" by D. C. Durrill and Dr. Donald D. Allen, Magnetic Propulsion Systems. Inc. and Boriding Steels for Wear Resistance by Howard C. Fielder and Richard 1. Sieraski, General Electric Co. (Metal Progress, Feb. 1971, pp. 101-107).
  • liquid salt bath composition Neither gives the liquid salt bath composition, but the latter paper states that it contains flourides of lithium, sodium, potassium, and boron. Temperatures and times reported vary from 1,450 1,650 F. and from 15 minutes to 36 hours.
  • the third and fourth steps in the method of this invention are hardening and tempering of the carburized, boronized and cleaned steel surfaces.
  • the hardening and tempering of carburized steel is a well known art.
  • the hardening usually quenching in agitated oil, from a temperature of at least 1,390 F., can be performed using one of the following procedures for carburized A181. 4815 steel to produce a substantially martensitic case:
  • Double quench from a carburizing or reducing atmosphere and temperatures of respectively 1,550 and 1,435 F. is preferred.
  • De-carburization or oxidation of the boronized case may be prevented by using a carburizing or reducing atmosphere or by a coating such as copper plating.
  • a suitable atmosphere is similar to the previously ex plained methane enriched endothermic gas except slightly higher in CO (about 0.4 to 0.8 percent) because of the lower temperatures.
  • the tempering temperature is usually low, 290 510 F., preferably about 330 F. for one hour, to toughen the carburized case without appreciably lowering its strength (hardness) to produce tempered martensite.
  • a satisfactory method for boronizing drill bit cutters and teeth produces a carburized foundation on the steel cutter of at least 0.030 inch.
  • a boronized case of at least 0.001 inch is produced (average about 0.005 inch) with a surface hardness in a range of about 900 to 2,100 KHN.
  • the hardening and tempering procedure develops a hardness in the carburized foundation in the range of about 50 to 64 Rockwell C (550 to 800 KHN).
  • an improved rotatable cutter comprising:
  • said carburized case being heat treated such that the boronized case has a strong and tough supporting base that resists deformation.
  • an improved rotatable cutter comprising:
  • said carburized case being hardened to produce a hardness comparable to that of tempered martensite
  • said teeth have an extremely hard and wear resistant boronized case over a deformation resistant carburized case.
  • an improved rotatable cutter comprising:
  • said carburized case being hardened to produce a hardness comparable to that of tempered martensite
  • said teeth have an extremely hard and wear resistant boronized case over a deformation resistant carburized case.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • Thermal Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
US00387565A 1973-08-10 1973-08-10 Boronized drill bit cutters Expired - Lifetime US3842921A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00387565A US3842921A (en) 1973-08-10 1973-08-10 Boronized drill bit cutters
CA194,786A CA1003817A (en) 1973-08-10 1974-03-12 Boronized drill bit cutters and methods
BR2517/74A BR7402517A (pt) 1973-08-10 1974-03-29 Aperfeicoamento em processo de fabricacao de cortadeiras rotativas e respectivas cortadeiras aperfeicoadas
GB2208074A GB1455951A (en) 1973-08-10 1974-05-17 Boronized drill bit cutters and methods
SE7409634A SE397842B (sv) 1973-08-10 1974-07-25 Skerrotor av stal for borrkrona for djupborrning samt forfarande for framstellning av en sadan rotor
IT26006/74A IT1017922B (it) 1973-08-10 1974-08-06 Punte per perforazioni geologiche con taglienti al boro e procedi mento per la loro fabbricazione

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BR (1) BR7402517A (enrdf_load_html_response)
CA (1) CA1003817A (enrdf_load_html_response)
GB (1) GB1455951A (enrdf_load_html_response)
IT (1) IT1017922B (enrdf_load_html_response)
SE (1) SE397842B (enrdf_load_html_response)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946817A (en) * 1974-12-23 1976-03-30 Hughes Tool Company Differentially carburized rock bit cutter
US4012238A (en) * 1973-08-10 1977-03-15 Hughes Tool Company Method of finishing a steel article having a boronized and carburized case
US4108692A (en) * 1975-01-13 1978-08-22 Smith International, Inc. Rock bit roller cutter and method therefor
US4188242A (en) * 1975-10-16 1980-02-12 Hughes Tool Company Combination carburizing and boronizing methods
US4249621A (en) * 1979-03-22 1981-02-10 Smith International, Inc. Friction bearing rock bit and segment
WO1983000184A1 (en) * 1981-07-02 1983-01-20 Turbine Metal Technology Inc Centrifugal pump
US4495005A (en) * 1983-10-31 1985-01-22 Dresser Industries, Inc. Carbosiliconizing ferrous substrates
US4495006A (en) * 1983-10-31 1985-01-22 Dresser Industries, Inc. Borocarburizing ferrous substrates
US4660444A (en) * 1986-06-09 1987-04-28 Dresser Industries, Inc. Hardening of selected areas of an earth boring rockbit
US4679640A (en) * 1986-02-21 1987-07-14 Dresser Industries, Inc. Method for case hardening rock bits and rock bits formed thereby
US4848476A (en) * 1980-03-24 1989-07-18 Reed Tool Company Drill bit having offset roller cutters and improved nozzles
US5455068A (en) * 1994-04-28 1995-10-03 Aves, Jr.; William L. Method for treating continuous extended lengths of tubular member interiors
US5492186A (en) * 1994-09-30 1996-02-20 Baker Hughes Incorporated Steel tooth bit with a bi-metallic gage hardfacing
US5921330A (en) * 1997-03-12 1999-07-13 Smith International, Inc. Rock bit with wear-and fracture-resistant hardfacing
US6478887B1 (en) * 1998-12-16 2002-11-12 Smith International, Inc. Boronized wear-resistant materials and methods thereof
US20040031625A1 (en) * 2002-08-19 2004-02-19 Lin Chih C. DLC coating for earth-boring bit bearings
US20040149494A1 (en) * 2003-01-31 2004-08-05 Smith International, Inc. High-strength/high-toughness alloy steel drill bit blank
US20080193298A1 (en) * 2007-02-14 2008-08-14 Hurst William D Treatment of turbine blades to increase hardness
RU2394145C1 (ru) * 2009-06-24 2010-07-10 Дмитрий Юрьевич Сериков Буровое шарошечное долото с центральной промывкой
RU2394146C1 (ru) * 2009-06-24 2010-07-10 Дмитрий Юрьевич Сериков Буровое гидромониторное шарошечное долото
US20110042146A1 (en) * 2008-05-09 2011-02-24 Frank Friedrich Lachmann Drill Bit Head for Percussion Drilling Apparatus
US20110132769A1 (en) * 2008-09-29 2011-06-09 Hurst William D Alloy Coating Apparatus and Metalliding Method
US8316679B2 (en) 2010-10-04 2012-11-27 Siemens Industry, Inc. Boronized laying pipe
US20130264860A1 (en) * 2012-04-06 2013-10-10 Caterpillar Inc. Cutting Head Tool for Tunnel Boring Machine
RU2522608C1 (ru) * 2013-07-05 2014-07-20 Дмитрий Юрьевич Сериков Буровое шарошечное долото
RU2543823C1 (ru) * 2014-02-05 2015-03-10 Дмитрий Юрьевич Сериков Буровое шарошечное долото
RU2567561C1 (ru) * 2014-11-21 2015-11-10 Дмитрий Юрьевич Сериков Буровое гидромониторное шарошечное долото
EP3004523A4 (en) * 2013-05-30 2017-02-22 Frank's International, LLC Coating system for tubular gripping components
CN107447183A (zh) * 2016-05-11 2017-12-08 威达国际工业有限合伙公司 具有改善的耐腐蚀性的牙轮钻头
RU2725711C1 (ru) * 2019-06-26 2020-07-03 Дмитрий Юрьевич Сериков Наддолотный калибратор
CN112981306A (zh) * 2021-02-10 2021-06-18 厦门钨业股份有限公司 一种高风压潜孔钎具钻头及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979998A (en) * 1989-10-10 1990-12-25 Union Carbide Corporation Process for forming a metal boride coating on a carbonaceous substrate
CA2516920A1 (en) 2004-08-31 2006-02-28 Smith International, Inc. Maintaining carburized case during neutral to the core heat treatment processes

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012238A (en) * 1973-08-10 1977-03-15 Hughes Tool Company Method of finishing a steel article having a boronized and carburized case
US3946817A (en) * 1974-12-23 1976-03-30 Hughes Tool Company Differentially carburized rock bit cutter
US4108692A (en) * 1975-01-13 1978-08-22 Smith International, Inc. Rock bit roller cutter and method therefor
US4188242A (en) * 1975-10-16 1980-02-12 Hughes Tool Company Combination carburizing and boronizing methods
US4249621A (en) * 1979-03-22 1981-02-10 Smith International, Inc. Friction bearing rock bit and segment
US4848476A (en) * 1980-03-24 1989-07-18 Reed Tool Company Drill bit having offset roller cutters and improved nozzles
WO1983000184A1 (en) * 1981-07-02 1983-01-20 Turbine Metal Technology Inc Centrifugal pump
US4826401A (en) * 1981-07-02 1989-05-02 Tmt Research Development Inc. Centrifugal pump
US4495005A (en) * 1983-10-31 1985-01-22 Dresser Industries, Inc. Carbosiliconizing ferrous substrates
US4495006A (en) * 1983-10-31 1985-01-22 Dresser Industries, Inc. Borocarburizing ferrous substrates
US4679640A (en) * 1986-02-21 1987-07-14 Dresser Industries, Inc. Method for case hardening rock bits and rock bits formed thereby
US4660444A (en) * 1986-06-09 1987-04-28 Dresser Industries, Inc. Hardening of selected areas of an earth boring rockbit
US5455068A (en) * 1994-04-28 1995-10-03 Aves, Jr.; William L. Method for treating continuous extended lengths of tubular member interiors
US5492186A (en) * 1994-09-30 1996-02-20 Baker Hughes Incorporated Steel tooth bit with a bi-metallic gage hardfacing
US5921330A (en) * 1997-03-12 1999-07-13 Smith International, Inc. Rock bit with wear-and fracture-resistant hardfacing
US6478887B1 (en) * 1998-12-16 2002-11-12 Smith International, Inc. Boronized wear-resistant materials and methods thereof
US20040031625A1 (en) * 2002-08-19 2004-02-19 Lin Chih C. DLC coating for earth-boring bit bearings
US7395884B2 (en) * 2003-01-31 2008-07-08 Smith International, Inc. High-strength/high toughness alloy steel drill bit blank
US20060201718A1 (en) * 2003-01-31 2006-09-14 Smith International, Inc. High-strength/high toughness alloy steel drill bit blank
US20040149494A1 (en) * 2003-01-31 2004-08-05 Smith International, Inc. High-strength/high-toughness alloy steel drill bit blank
US7044243B2 (en) 2003-01-31 2006-05-16 Smith International, Inc. High-strength/high-toughness alloy steel drill bit blank
US20080193298A1 (en) * 2007-02-14 2008-08-14 Hurst William D Treatment of turbine blades to increase hardness
US7931446B2 (en) 2007-02-14 2011-04-26 X-Treme Aerospace Inc. Treatment of turbine blades to increase hardness
US20110042146A1 (en) * 2008-05-09 2011-02-24 Frank Friedrich Lachmann Drill Bit Head for Percussion Drilling Apparatus
US20110132769A1 (en) * 2008-09-29 2011-06-09 Hurst William D Alloy Coating Apparatus and Metalliding Method
RU2394146C1 (ru) * 2009-06-24 2010-07-10 Дмитрий Юрьевич Сериков Буровое гидромониторное шарошечное долото
RU2394145C1 (ru) * 2009-06-24 2010-07-10 Дмитрий Юрьевич Сериков Буровое шарошечное долото с центральной промывкой
US8316679B2 (en) 2010-10-04 2012-11-27 Siemens Industry, Inc. Boronized laying pipe
US20130264860A1 (en) * 2012-04-06 2013-10-10 Caterpillar Inc. Cutting Head Tool for Tunnel Boring Machine
US9140123B2 (en) * 2012-04-06 2015-09-22 Caterpillar Inc. Cutting head tool for tunnel boring machine
EP3192893A1 (en) * 2013-05-30 2017-07-19 Frank's International, LLC Coating system for tubular gripping components
AU2017202112B2 (en) * 2013-05-30 2018-12-13 Frank's International, Llc Coating System for Tubular Gripping Components
EP3004523A4 (en) * 2013-05-30 2017-02-22 Frank's International, LLC Coating system for tubular gripping components
US9695650B2 (en) 2013-05-30 2017-07-04 Frank's International, Llc Coating system for tubular gripping components
RU2522608C1 (ru) * 2013-07-05 2014-07-20 Дмитрий Юрьевич Сериков Буровое шарошечное долото
RU2543823C1 (ru) * 2014-02-05 2015-03-10 Дмитрий Юрьевич Сериков Буровое шарошечное долото
RU2567561C1 (ru) * 2014-11-21 2015-11-10 Дмитрий Юрьевич Сериков Буровое гидромониторное шарошечное долото
CN107447183A (zh) * 2016-05-11 2017-12-08 威达国际工业有限合伙公司 具有改善的耐腐蚀性的牙轮钻头
US9988854B2 (en) 2016-05-11 2018-06-05 Varel International Ind., L.P. Roller cone drill bit with improved erosion resistance
CN107447183B (zh) * 2016-05-11 2021-06-15 威达国际工业有限合伙公司 具有改善的耐腐蚀性的牙轮钻头
RU2725711C1 (ru) * 2019-06-26 2020-07-03 Дмитрий Юрьевич Сериков Наддолотный калибратор
CN112981306A (zh) * 2021-02-10 2021-06-18 厦门钨业股份有限公司 一种高风压潜孔钎具钻头及其制备方法

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SE397842B (sv) 1977-11-21
IT1017922B (it) 1977-08-10
SE7409634L (enrdf_load_html_response) 1975-02-11
CA1003817A (en) 1977-01-18
BR7402517A (pt) 1975-12-02

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