US3372021A - Tungsten addition agent - Google Patents

Tungsten addition agent Download PDF

Info

Publication number
US3372021A
US3372021A US376550A US37655064A US3372021A US 3372021 A US3372021 A US 3372021A US 376550 A US376550 A US 376550A US 37655064 A US37655064 A US 37655064A US 3372021 A US3372021 A US 3372021A
Authority
US
United States
Prior art keywords
tungsten
iron
powder
addition agent
mixture
Prior art date
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
Application number
US376550A
Inventor
Marjorie I Forbes
Daniel H Barbour
Charles M Brown
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.)
Union Carbide Corp
Original Assignee
Union Carbide Corp
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 Union Carbide Corp filed Critical Union Carbide Corp
Priority to US376550A priority Critical patent/US3372021A/en
Application granted granted Critical
Publication of US3372021A publication Critical patent/US3372021A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum

Definitions

  • the present invention relates to addition agents for use in the manufacture of steel. More particularly, the present invention relates to a tungsten-containing addition agent which is rapidly dissolved in molten steel and which provides high recoveries of tungsten.
  • tungsten addition agents have been made mostly as ferrotungsten alloy containing from 78- 82% tungsten and such material has been generally added to steel baths in the form of particles sized on the order of inch. While ferrotungsten alloy used in this manner provides certain advantages, the solution times required and concurrent decrease in the bath temperature are drawbacks which limit the effectiveness of this material.
  • 'It is therefore an object of the present invention to provide a tungsten addition agent which is rapidly soluble in molten steel.
  • An addition agent in accordance with the present invention is a pressed mixture of tungsten powder and iron powder containing at least about 15% iron by weight and at least about 50% tungsten by weight.
  • iron powder the predominant proportion being sized from 48 to 200 mesh, is blended with tungsten powder of which the predominant proportion is sized 100 to microns.
  • the indicated sizing of the iron and tungsten powder is important in order to provide a product having the desired structure hereinafter described.
  • the proportions of iron and tungsten in the mixture are also important for the purpose of providing suitable handling strength and density.
  • the preferred ranges for iron and tungsten are -35% and 65-85%, respectively.
  • the mixture is pressed by powder metallurgical techniques into convenient forms having a density of between 50 and 75% of the maximum theoretical density of the mixture.
  • the mixture can be pressed into pellets using conventional steel dies.
  • a pressure of 4000 p.s.i. can be used to form /8" diameter pellets which are sponge-like in structure and have a suitable density.
  • the article formed in the foregoing manner is characterized by a structure and density and strength characteristics which substantially improve its effectiveness as an addition agent.
  • the structure of the compressed irontungsten mixture is porous and comprises a matrix of iron in which the tungsten particles, in substantially their original size and shape, are embedded. That is to say, the tungsten powder is effectively densified without significantly affecting the sizing of the powder. Consequently, upon addition to molten steel, the fine tungsten particles are released and dissolve rapidly while the losses ordinarily encountered with tungsten powder additions are avoided. Also, the density of the compressed irontungsten mixture of this invention is such that it does not sink rapidly but descends through a molten steel bath at a convenient and effective rate.
  • the pressed articles formed in the foregoing manner are sintered during or after pressing so as to provide increased handling strength.
  • the sintering temperature and time used is such that the density of the pressed article is not increased outside of the aforementioned range.
  • Example I A 50 gram blended mixture of tungsten powder and iron powder was prepared. The tungsten, 80% of the mixture, was sized 10-50 microns and the iron, 20% of the mixture, was sized 48-200 mesh.
  • Pellets (0.253 in. x 0.387 in. diameter) were produced by pressing in dies at 4000 p.s.i. After pressing the pellets were sintered in a tungsten boat at 1400" C. for 15 minutes. The resulting articles had a density of 8.63 g./cc.
  • Example II The same procedure was used as in Example I except that the mixture was 50% W, 50% Fe.
  • the articles obtained had a density of 6.9 g./cc.
  • Example III A 250 lb. blended mixture of tungsten powder and iron powder was prepared. The tungsten, 80% of the mixture, was sized 10-50 microns and the iron, 20% of the mixture, was sized 48-200 mesh.
  • the mixture was passed through 16 inch diameter rolls three times at a roll pressure of 19,000-26,000 lbs. per inch of roll face to provide a sheet product about 4; inch thick having a density of 10 g./ cc.
  • the sheet product was then sintered at 1350 C. for about 4 hours in a Globar furnace. The density of the sintered material was about 10 g./cc.
  • Example lV Example V The same procedure as in Example III was followed with a 50% W, 50% Fe mixture except that 4 roll passes were made.
  • the density of the sheet material was 8.2 g./oc. and the density of the sintered material was about 8.3 g./cc.
  • nickel powder can be substituted for all or part of the iron.
  • the mesh sizes referred to herein are Tyler Standard Series.
  • a pressed mixture of elemental tungsten powder and elemental iron powder consisting essentially of about 50 to 80% tungsten and about 20 to iron having a density between 50 and of the theoretical density of the mixture and char acterized by having an iron matrix in which the tungsten powder particles, in substantially their original size and shape, are embedded, the original particle sizing of the iron powder being substantially from about 48 to 200 mesh and the original sizing of the tungsten powder being substantially 10 to 50 microns.
  • An addition agent in accordance with claim 1 consisting essentially of about tungsten and about 20% iron.
  • An addition agent in accordance with claim 1 consisting essentially of about 50% tungsten and about 50% iron.
  • An addition agent in accordance with claim 1 wherein the original particle sizing of the iron powder is substantially all in the range of 48 to 200 mesh and the original sizing of the tungsten powder is substantially all in the range of 10 to 50 microns.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Description

United States Patent 3,372,021 TUNGSTEN ADDITION AGENT Edward C. Forbes, deceased, late of Lewiston, N.Y., by Marjorie I. Forbes, executrix, Lewiston, Daniel H. Barbour, Niagara Falls, and Charles M. Brown, Lewiston, N.Y., assignors to Union Carbide Corporation, a corporation of New York No Drawing. Filed June 19, 1964, Ser. No. 376,550 5 Claims. (Cl. 75-.5)
The present invention relates to addition agents for use in the manufacture of steel. More particularly, the present invention relates to a tungsten-containing addition agent which is rapidly dissolved in molten steel and which provides high recoveries of tungsten.
Up to the present, tungsten addition agents have been made mostly as ferrotungsten alloy containing from 78- 82% tungsten and such material has been generally added to steel baths in the form of particles sized on the order of inch. While ferrotungsten alloy used in this manner provides certain advantages, the solution times required and concurrent decrease in the bath temperature are drawbacks which limit the effectiveness of this material.
'It is therefore an object of the present invention to provide a tungsten addition agent which is rapidly soluble in molten steel.
It is another object of the present invention to provide a tungsten addition agent which does not cause an excessive decrease in the temperature of the steel bath in which it is used.
It is a further object of the present invention to provide a tungsten addition agent for use in the manufacture of steel which provides high tungsten recoveries.
Other objects will be apparent from the following description and claims.
An addition agent in accordance with the present invention is a pressed mixture of tungsten powder and iron powder containing at least about 15% iron by weight and at least about 50% tungsten by weight.
In the preparation of the addition agent of the present invention iron powder, the predominant proportion being sized from 48 to 200 mesh, is blended with tungsten powder of which the predominant proportion is sized 100 to microns.
The indicated sizing of the iron and tungsten powder is important in order to provide a product having the desired structure hereinafter described.
The proportions of iron and tungsten in the mixture are also important for the purpose of providing suitable handling strength and density. The preferred ranges for iron and tungsten are -35% and 65-85%, respectively.
When a suitable blended mixture of iron and tungsten powder is provided in accordance with the present invention, the mixture is pressed by powder metallurgical techniques into convenient forms having a density of between 50 and 75% of the maximum theoretical density of the mixture. For example the mixture can be pressed into pellets using conventional steel dies. With a mixture containing iron (sized mostly 48 mesh with some finer particles) and 80% W (sized 10-50 microns), a pressure of 4000 p.s.i. can be used to form /8" diameter pellets which are sponge-like in structure and have a suitable density.
The article formed in the foregoing manner is characterized by a structure and density and strength characteristics which substantially improve its effectiveness as an addition agent.
For example, the structure of the compressed irontungsten mixture is porous and comprises a matrix of iron in which the tungsten particles, in substantially their original size and shape, are embedded. That is to say, the tungsten powder is effectively densified without significantly affecting the sizing of the powder. Consequently, upon addition to molten steel, the fine tungsten particles are released and dissolve rapidly while the losses ordinarily encountered with tungsten powder additions are avoided. Also, the density of the compressed irontungsten mixture of this invention is such that it does not sink rapidly but descends through a molten steel bath at a convenient and effective rate.
In a further embodiment of the present invention, the pressed articles formed in the foregoing manner are sintered during or after pressing so as to provide increased handling strength.
The sintering temperature and time used is such that the density of the pressed article is not increased outside of the aforementioned range.
By way of example, with a pellet (20% Fe, W) pressed from a mixture (Fe sized 48-200 mesh; W sized 10-50 microns) at a pressure of 4000 p.s.i., sintering at a temperature of 1400 C. for 15 minutes provides an addition agent having the desired structure, excellent handling strength and satisfactory density.
The following examples will further illustrate the present invention.
Example I A 50 gram blended mixture of tungsten powder and iron powder was prepared. The tungsten, 80% of the mixture, was sized 10-50 microns and the iron, 20% of the mixture, was sized 48-200 mesh.
Pellets (0.253 in. x 0.387 in. diameter) were produced by pressing in dies at 4000 p.s.i. After pressing the pellets were sintered in a tungsten boat at 1400" C. for 15 minutes. The resulting articles had a density of 8.63 g./cc.
Example II The same procedure was used as in Example I except that the mixture was 50% W, 50% Fe. The articles obtained had a density of 6.9 g./cc.
Example III A 250 lb. blended mixture of tungsten powder and iron powder was prepared. The tungsten, 80% of the mixture, was sized 10-50 microns and the iron, 20% of the mixture, was sized 48-200 mesh.
The mixture was passed through 16 inch diameter rolls three times at a roll pressure of 19,000-26,000 lbs. per inch of roll face to provide a sheet product about 4; inch thick having a density of 10 g./ cc. The sheet product was then sintered at 1350 C. for about 4 hours in a Globar furnace. The density of the sintered material was about 10 g./cc.
Example lV Example V The same procedure as in Example III was followed with a 50% W, 50% Fe mixture except that 4 roll passes were made.
The density of the sheet material was 8.2 g./oc. and the density of the sintered material was about 8.3 g./cc.
manner to provide a comparison. The results are shown in Table I.
TABLE I Solution Temp. Percent Addition Agent Time, Drop, Re-
seconds C. covery Standard (79.18% W) ferrotungsten- 38 14 94 30% ferrotnngsten. 60 29 93 80% W, 20% Fe (Example III) 21 I 7 87 50% w, 50% Fe (Example 1v 30 14 edmixture with iron and at least the stoichiometric amount of carbon for forming CO, the solution time is significantly decreased and tungsten recoveries are im* proved. This occurs due to the formation and evolution of carbon monoxide gas, upon reaction of the contained oxygen and-carbon.
.Although the foregoing description has referred specifically to the use of iron powder, nickel powder can be substituted for all or part of the iron.
The mesh sizes referred to herein are Tyler Standard Series.
What is claimed is: v
1. As an alloy addition agent, a pressed mixture of elemental tungsten powder and elemental iron powder consisting essentially of about 50 to 80% tungsten and about 20 to iron having a density between 50 and of the theoretical density of the mixture and char acterized by having an iron matrix in which the tungsten powder particles, in substantially their original size and shape, are embedded, the original particle sizing of the iron powder being substantially from about 48 to 200 mesh and the original sizing of the tungsten powder being substantially 10 to 50 microns. v
2. An addition agent in accordance with claim 1 consisting essentially of about tungsten and about 20% iron.
3. An addition agent in accordance with claim 1 consisting essentially of about 50% tungsten and about 50% iron.
4. An addition agent in accordance with claim 1 in which the tungsten powder has an oxygen content of from about 0.10 to 0.25% and in which carbon is included in at least the stoichiometric amount to combine with said oxygen to form carbon monoxide. f
5. An addition agent in accordance with claim 1 Wherein the original particle sizing of the iron powder is substantially all in the range of 48 to 200 mesh and the original sizing of the tungsten powder is substantially all in the range of 10 to 50 microns.
References Cited UNITED STATES PATENTS 1,775,358 9/1930 Smith. 2,302,616 11/1942 Linz 75--l22 2,763,918 9/1956 Megill 75176 DAVID L. RECK, Primary Examiner.
HYLAND BIZOT, Examiner.
35 W. STALLARD, Assistant Examiner.

Claims (1)

1. AS AN ALLOY ADDITION AGENT, A PRESSED MIXTURE OF ELEMENTAL TUNGSTEN POWDER AND ELEMTA IRON POWDER CONSISTING ESSENTIALLY OF ABOUT 50 TO 80% TUNGSTEN AND ABOUT 20 TO 50% IRON HAVING A DENSITY BETWEEN 50 AND 75% OF THE THEORETICAL DENSITY OF THE MIXUTRE AND CHARACTERIZED BY HAVING AN IRON MATRIX IN WHICH THE TUNGSTEN POWDER PARTICLES, IN SUBSTANTIALLY THEIR ORIGINAL SIZE AND SHAPE, ARE EMBEDDED, THE ORIGINAL PARTICLE SIZING OF THE IRON POWDER BEING SUBSTANTIALLY FROM ABOUT 48 TO 200 MESH AND THE ORGINAL SIZING OF THE TUNGSTEN POWDER BEING SUBSTANTIALLY 10 TO 50 MICRONS.
US376550A 1964-06-19 1964-06-19 Tungsten addition agent Expired - Lifetime US3372021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US376550A US3372021A (en) 1964-06-19 1964-06-19 Tungsten addition agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US376550A US3372021A (en) 1964-06-19 1964-06-19 Tungsten addition agent

Publications (1)

Publication Number Publication Date
US3372021A true US3372021A (en) 1968-03-05

Family

ID=23485459

Family Applications (1)

Application Number Title Priority Date Filing Date
US376550A Expired - Lifetime US3372021A (en) 1964-06-19 1964-06-19 Tungsten addition agent

Country Status (1)

Country Link
US (1) US3372021A (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2324751A1 (en) * 1975-09-22 1977-04-15 Treibacher Chemische Werke Ag ADDITIVE FOR MELTED STEEL MASSES
WO1993022470A1 (en) * 1992-05-05 1993-11-11 Teledyne Industries, Inc. Composite shot
WO1996011762A1 (en) * 1994-10-18 1996-04-25 Teledyne Industries, Incorporated Composite shots and methods of making
US5831188A (en) * 1992-05-05 1998-11-03 Teledyne Industries, Inc. Composite shots and methods of making
US6248150B1 (en) 1999-07-20 2001-06-19 Darryl Dean Amick Method for manufacturing tungsten-based materials and articles by mechanical alloying
US6270549B1 (en) 1998-09-04 2001-08-07 Darryl Dean Amick Ductile, high-density, non-toxic shot and other articles and method for producing same
US6527880B2 (en) 1998-09-04 2003-03-04 Darryl D. Amick Ductile medium-and high-density, non-toxic shot and other articles and method for producing the same
US6749802B2 (en) 2002-01-30 2004-06-15 Darryl D. Amick Pressing process for tungsten articles
US20040112243A1 (en) * 2002-01-30 2004-06-17 Amick Darryl D. Tungsten-containing articles and methods for forming the same
US20040216589A1 (en) * 2002-10-31 2004-11-04 Amick Darryl D. Tungsten-containing articles and methods for forming the same
US20050034558A1 (en) * 2003-04-11 2005-02-17 Amick Darryl D. System and method for processing ferrotungsten and other tungsten alloys, articles formed therefrom and methods for detecting the same
US6884276B2 (en) 2000-01-14 2005-04-26 Darryl D. Amick Methods for producing medium-density articles from high-density tungsten alloys
US20050268809A1 (en) * 2004-06-02 2005-12-08 Continuous Metal Technology Inc. Tungsten-iron projectile
US7000547B2 (en) 2002-10-31 2006-02-21 Amick Darryl D Tungsten-containing firearm slug
US7217389B2 (en) 2001-01-09 2007-05-15 Amick Darryl D Tungsten-containing articles and methods for forming the same
US7267794B2 (en) 1998-09-04 2007-09-11 Amick Darryl D Ductile medium-and high-density, non-toxic shot and other articles and method for producing the same
US7399334B1 (en) 2004-05-10 2008-07-15 Spherical Precision, Inc. High density nontoxic projectiles and other articles, and methods for making the same
US20100034686A1 (en) * 2005-01-28 2010-02-11 Caldera Engineering, Llc Method for making a non-toxic dense material
US8122832B1 (en) 2006-05-11 2012-02-28 Spherical Precision, Inc. Projectiles for shotgun shells and the like, and methods of manufacturing the same
US9677860B2 (en) 2011-12-08 2017-06-13 Environ-Metal, Inc. Shot shells with performance-enhancing absorbers
US10260850B2 (en) 2016-03-18 2019-04-16 Environ-Metal, Inc. Frangible firearm projectiles, methods for forming the same, and firearm cartridges containing the same
US10690465B2 (en) 2016-03-18 2020-06-23 Environ-Metal, Inc. Frangible firearm projectiles, methods for forming the same, and firearm cartridges containing the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1775358A (en) * 1929-09-23 1930-09-09 Gen Reduction Corp Uniting of iron with other metals and elements
US2302616A (en) * 1941-04-22 1942-11-17 Climax Molybdenum Co Briquette for the addition of tungsten to ferrous alloys
US2763918A (en) * 1953-06-05 1956-09-25 Chromium Mining & Smelting Cor Process of making a ferroalloying material and product obtained thereby

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1775358A (en) * 1929-09-23 1930-09-09 Gen Reduction Corp Uniting of iron with other metals and elements
US2302616A (en) * 1941-04-22 1942-11-17 Climax Molybdenum Co Briquette for the addition of tungsten to ferrous alloys
US2763918A (en) * 1953-06-05 1956-09-25 Chromium Mining & Smelting Cor Process of making a ferroalloying material and product obtained thereby

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2324751A1 (en) * 1975-09-22 1977-04-15 Treibacher Chemische Werke Ag ADDITIVE FOR MELTED STEEL MASSES
WO1993022470A1 (en) * 1992-05-05 1993-11-11 Teledyne Industries, Inc. Composite shot
US5264022A (en) * 1992-05-05 1993-11-23 Teledyne Industries, Inc. Composite shot
US5713981A (en) * 1992-05-05 1998-02-03 Teledyne Industries, Inc. Composite shot
US5831188A (en) * 1992-05-05 1998-11-03 Teledyne Industries, Inc. Composite shots and methods of making
WO1996011762A1 (en) * 1994-10-18 1996-04-25 Teledyne Industries, Incorporated Composite shots and methods of making
US6890480B2 (en) 1998-09-04 2005-05-10 Darryl D. Amick Ductile medium- and high-density, non-toxic shot and other articles and method for producing the same
US7640861B2 (en) 1998-09-04 2010-01-05 Amick Darryl D Ductile medium- and high-density, non-toxic shot and other articles and method for producing the same
US6270549B1 (en) 1998-09-04 2001-08-07 Darryl Dean Amick Ductile, high-density, non-toxic shot and other articles and method for producing same
US6527880B2 (en) 1998-09-04 2003-03-04 Darryl D. Amick Ductile medium-and high-density, non-toxic shot and other articles and method for producing the same
US7267794B2 (en) 1998-09-04 2007-09-11 Amick Darryl D Ductile medium-and high-density, non-toxic shot and other articles and method for producing the same
US20050211125A1 (en) * 1998-09-04 2005-09-29 Amick Darryl D Ductile medium-and high-density, non-toxic shot and other articles and method for producing the same
US6527824B2 (en) 1999-07-20 2003-03-04 Darryl D. Amick Method for manufacturing tungsten-based materials and articles by mechanical alloying
US6248150B1 (en) 1999-07-20 2001-06-19 Darryl Dean Amick Method for manufacturing tungsten-based materials and articles by mechanical alloying
US7329382B2 (en) 2000-01-14 2008-02-12 Amick Darryl D Methods for producing medium-density articles from high-density tungsten alloys
US6884276B2 (en) 2000-01-14 2005-04-26 Darryl D. Amick Methods for producing medium-density articles from high-density tungsten alloys
US20050188790A1 (en) * 2000-01-14 2005-09-01 Amick Darryl D. Methods for producing medium-density articles from high-density tungsten alloys
US7217389B2 (en) 2001-01-09 2007-05-15 Amick Darryl D Tungsten-containing articles and methods for forming the same
US6823798B2 (en) 2002-01-30 2004-11-30 Darryl D. Amick Tungsten-containing articles and methods for forming the same
US20040112243A1 (en) * 2002-01-30 2004-06-17 Amick Darryl D. Tungsten-containing articles and methods for forming the same
US6749802B2 (en) 2002-01-30 2004-06-15 Darryl D. Amick Pressing process for tungsten articles
US7000547B2 (en) 2002-10-31 2006-02-21 Amick Darryl D Tungsten-containing firearm slug
US7059233B2 (en) 2002-10-31 2006-06-13 Amick Darryl D Tungsten-containing articles and methods for forming the same
US20040216589A1 (en) * 2002-10-31 2004-11-04 Amick Darryl D. Tungsten-containing articles and methods for forming the same
US20050034558A1 (en) * 2003-04-11 2005-02-17 Amick Darryl D. System and method for processing ferrotungsten and other tungsten alloys, articles formed therefrom and methods for detecting the same
US7383776B2 (en) 2003-04-11 2008-06-10 Amick Darryl D System and method for processing ferrotungsten and other tungsten alloys, articles formed therefrom and methods for detecting the same
US7399334B1 (en) 2004-05-10 2008-07-15 Spherical Precision, Inc. High density nontoxic projectiles and other articles, and methods for making the same
US7422720B1 (en) 2004-05-10 2008-09-09 Spherical Precision, Inc. High density nontoxic projectiles and other articles, and methods for making the same
US20050268809A1 (en) * 2004-06-02 2005-12-08 Continuous Metal Technology Inc. Tungsten-iron projectile
US7690312B2 (en) 2004-06-02 2010-04-06 Smith Timothy G Tungsten-iron projectile
US20100034686A1 (en) * 2005-01-28 2010-02-11 Caldera Engineering, Llc Method for making a non-toxic dense material
US8122832B1 (en) 2006-05-11 2012-02-28 Spherical Precision, Inc. Projectiles for shotgun shells and the like, and methods of manufacturing the same
US9677860B2 (en) 2011-12-08 2017-06-13 Environ-Metal, Inc. Shot shells with performance-enhancing absorbers
US9897424B2 (en) 2011-12-08 2018-02-20 Environ-Metal, Inc. Shot shells with performance-enhancing absorbers
US10209044B2 (en) 2011-12-08 2019-02-19 Environ-Metal, Inc. Shot shells with performance-enhancing absorbers
US10260850B2 (en) 2016-03-18 2019-04-16 Environ-Metal, Inc. Frangible firearm projectiles, methods for forming the same, and firearm cartridges containing the same
US10690465B2 (en) 2016-03-18 2020-06-23 Environ-Metal, Inc. Frangible firearm projectiles, methods for forming the same, and firearm cartridges containing the same
US11280597B2 (en) 2016-03-18 2022-03-22 Federal Cartridge Company Frangible firearm projectiles, methods for forming the same, and firearm cartridges containing the same
US11359896B2 (en) 2016-03-18 2022-06-14 Federal Cartridge Company Frangible firearm projectiles, methods for forming the same, and firearm cartridges containing the same

Similar Documents

Publication Publication Date Title
US3372021A (en) Tungsten addition agent
US3334992A (en) Vanadium containing addition agent and process for producing same
US2814566A (en) Boron and carbon containing hard cemented materials and their production
US3397057A (en) Method for producing flowable metal powders
US2799570A (en) Process of making parts by powder metallurgy and preparing a powder for use therein
US3158473A (en) Method for producing composite bodies
JP2000501786A (en) Prealloyed powder and its use in the production of diamond tools
US2671953A (en) Metal body of high porosity
US2765227A (en) Titanium carbide composite material
US2678270A (en) Molybdenum-tantalum alloys
US2489839A (en) Process for carburizing compacted iron articles
US3533760A (en) Dispersion strengthened nickel-chromium alloy composition
US2657129A (en) Aluminum-alloyed corrosion-resistant metal powders and related products and processes
US2840891A (en) High temperature structural material and method of producing same
US3196007A (en) Beryllium copper composition and method of producing green compacts and sintered articles therefrom
US1975084A (en) Composition of matter and process of treating molten metals
US2657127A (en) Production of chromium-alloyed corrosion-resistant metal powders and related products
US2920958A (en) Method for the powder metallurgical manufacture of chromium alloys
US4053578A (en) Process for oxidizing primarily nickel powders
US3141235A (en) Powdered tantalum articles
US3009809A (en) Sintering of iron-aluminum base powders
US2833645A (en) Reduction of chromium oxides
US3481714A (en) Flowable metal powders
US2839379A (en) Metal aggregate
US2159604A (en) Metallic article