Tungsten Metal Price

Swaging Brings Benefits to Tungsten Alloy Rod

Details: Category: Tungsten Information; Published on Wednesday, 19 June 2013 18:09; Hits: 2052

Swaging is a very fast metal forming process, eg. 4-6 parts per minute. In addition to the speed of manufacture, the swaging process itself improves the mechanical strength properties of tungsten alloy rod due to the work hardening phenomenon. Improved strength properties allow one to form very thin walled tubes, or to use tungsten alloy rod of a lower hardness classification (less expensive material). This would not be possible with conventional metal cutting operations. Swaging can be applied up to tungsten alloy rod length of some 1000 mm.

Tungsten alloy rod manufacturing by swaging has another key benefit, namely weight optimization combined with forming of internal geometries. Since the material volume of the tungsten alloy rod remains constant, a reduction of the outside diameter of a solid bar would lead to an increased length of the same tungsten alloy rod. In the case of a drive shaft for a passenger car made of a solid bar, 20% material savings can be obtained by swaging compared to traditional metal cutting techniques.

In most cases swaging works on the basis of tungsten alloy rod that is hammered down to a specific diameter. However, the swaging process actually allows the manufacturer to vary the wall thickness of tungsten alloy rod to match certain requirements for weight distribution and strength. In that context it is also important to stress that the swaging process allows one to form internal splines or other geometries with net shape accuracy (i.e quality IT7, and sometimes IT6 would be obtainable).

A third key benefit of swaging is the excellent surface quality, and is directly comparable with a ground surface. More specifically, a surface roughness of Ra 0.1-0.3 can be obtained for internal geometries, and on outer surfaces for recess swaging Ra 0.6-1.0 can be guaranteed.

A fourth benefit that certainly shall not be neglected is the very long and reliable service life of the swaging tools. As a rule of thumb, the tools do not wear out but crack, which means that only good parts are swaged until tool breakage. Another rule of thumb is that swaging tools made of tungsten carbide have a 4-5 times longer service life than tools made of tool steel. So for large production series, carbide tools should be applied.

Put in short: Swaging offers a fast, reliable, and cost effective manufacturing process that also saves weight of tungsten alloy rod without giving in on requirements as strength, functionality or quality.

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Corrosion Resistance on Tungsten Alloy Surface

Details: Category: Tungsten Information; Published on Wednesday, 19 June 2013 18:05; Hits: 2164

Although tungsten alloy has high density and good mechanical property, properties of tungsten alloy surface such as poor wear resistance and corrosion resistance limit the applications in some aspects.

For that scientists do researches on handling tungsten alloy surface. Dini carried on chemical corrosion on tungsten alloy surface. Then a lay was electroplating deposited on tungsten alloy surface, improving anchoring strength between Ni and tungsten alloy surface so that improved the corrosion resistance on tungsten alloy surface. Eroglu, Ekren and Baykara hardened the surface of 92.5W-5.25Ni-2.25Fe directly in the atmosphere combining CH₄and Ar, under the temperature of 1200℃.

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90% Tungsten Alloy Swaging Rod

Details: Category: Tungsten Information; Published on Tuesday, 18 June 2013 18:28; Hits: 2163

Through liner deformation (deformation amount is 27%), tensile strength, yield strength and elongation of 90% tungsten alloy swaging rod are 1200MPa, 1165MPa and 7%. We have known that deformation of forging has influence on properties of tungsten alloy. So using liner deformation, tensile strength of 90% tungsten alloy swaging rod is 1200MPa and elongation is 10%. During three times circular swaging deformation amount of 90% tungsten alloy swaging rod is increased from 16.9% to 38.9%~48.1% and strength is improved greatly too.

For material of tungsten alloy armor piercing whose aspect ratio is about 16 and tensile strength is about 1200MPa, it can meet the requirement by using liner deformation. While for newly developed tungsten alloy armor piercing whose has large aspect ratio (aspect ratio is higher or equal to 30~40) and high tenacity (σ_b≥1500MPa，δ≥8%~10%), it needs to be swaged for several times so that can meet the requirement.

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Military Tungsten Alloy Cube

Details: Category: Tungsten Information; Published on Wednesday, 19 June 2013 09:02; Hits: 2156

Military tungsten alloy cube is usually consisted of W-Ni- Fe or W-Ni- Cu or even W-Ni-Cu-Fe, some tungsten alloy is added Co, Mo, Cr , etc., The most important property for tungsten alloy cube is that small volume with high density, which means it could be used in some fields need the little but heavy parts, such as the counterweights of golf club, fishing weights, counterweights for military defense, such as counterweights for hunting gun, prefabricated fragments, the missile weapons, armor piercing ammunitio; counterweights for oil logging; also some fields concerning with precision instrument, such as mobile phone vibrator, clock cube, self-winding watches, anti-vibration toll holders, flywheel weights, etc

Military tungsten alloy cube has excellent radiation resistance, electric and thermal conductibities and corrosion resistance characters with high density (16---18.5g/cm3) and good mechanical strength. It has small coefficient of expansion and large elastic modulus. Tungsten alloy cube is extensively used in military equipment.

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Advantages of Tungsten Alloy Swaging Rod

Details: Category: Tungsten Information; Published on Tuesday, 18 June 2013 16:17; Hits: 2266

Of particular importance to ordnance applications are the properties of tensile strength and ductility. Tensile strength is required for alloys used in kinetic energy penetrator designed to defeat multiple space armor, for higher tensile strength, deeper armor rod penetrating under the same conditions. Besides sufficient strength the penetrator rod must remain ductile enough to endure flexure when hitting on the armor without fracture and endure greater cold working deformation to further improve strength. So tungsten alloy swaging rod with high tensile strength and good ductility is desirable for making the penetrator rod.

Tungsten alloy swaging rod is a particle composite which contains a very large percentage of nearly spherical tungsten particles embedded in a ductile matrix of nickel -iron. This composite structure results in a high density material with a useful combination of mechanical properties: high strength, moderate, ductility and outstanding thermal conductivity.

Tungsten alloy swaging rod which being made of tungsten alloy blank also possess the properties the tungsten alloy has. And tungsten alloy swaging rod has been improved the properties of tensile strength through swaging and machining. The properties above make tungsten alloy swaging rod an attractive for many military and civil applications, such as depleted uranium penetrators, bullet, armor piercing, rifle bullet, snipe rifle penetrator and so on.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
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