CHEMETAL USA specializes in the manufacturing of tungsten rod. We offer tungsten rods with diameters ranging from 0.029″ to 5.0” or more. The centerless grinding surface is available for tungsten rod with a diameter less than 1.6″. Hot isostatic pressing ensures our tungsten rods obtain a high density and fine grain size. These two properties are critical to the components fabricated with the rods since it will help the components have an expected performance and a long service lifespan. Our pure tungsten rod is thoroughly checked with NDT (Non-Destructive Testing) in order to identify and eliminate the crack lines, pores and various other defects.
Tungsten Rod Types
|Diameter||0.029″ (0.75mm) – 5″ (127 mm)|
|Length||0.15″ (3.81mm) – 40″ (1000mm)|
|Composition||W≥99.95%, WNiFe, WNiCu, WCu, WLa|
|Rod Surface||Ground, Polished, Chemical Cleaned|
As an ISO certified tungsten rod products manufacturer, CHEMETAL USA is capable of offering various types of Tungsten rod,Tungsten heavy alloy rod, Tungsten Nickel Iron Alloy (W-Ni-Fe) rod,Tungsten Nickel Copper Alloy (W-Ni-Cu) rod, Copper Tungsten (W-Cu) rod, Lanthanated Tungsten (W-La) rod that all meet a consistently high standard of diameter tolerance, roundness, straightness. and machinability. Two surfaces tungsten rods have are polished and ground.
Tungsten Rod Sizes
|Form||Dia. Inch||Dia. Inch||Dia. Inch||Dia. Inch||Dia. Inch|
Tungsten Rod Forming
The common processes to form tungsten rod are swaging and continuous rolling. Rotary swaging is a hammering process to forge rods. The sintered tungsten billets need to be heated to 1400 – 1600°C in a hydrogen atmosphere and then deformed to a rod shape by rotary forging on different types of swaging machines. Continuous rolling by Y type triple rolls mill is a more advanced process than swaging since it has a higher production efficiency and help tungsten rod has a better homogeneous microstructure.
Tungsten Rod Cutting and Sawing
Tungsten Carbide Cutting Tools
Tungsten Carbide blade is a very common tool used to cut tungsten rod and other working pieces which have high hardness and strength like tungsten. The typical grades of cemented carbide blades to cut tungsten rod are YG6, YG8, YS2 (YG10H), 726.
CBN Cutting Tools
CBN (Cubic Boron Nitride) material is another good choice when it comes to the materials suitable for tungsten machining work. The main CBN cutting tools are CBN turning inserts and grinding wheels. Compared to Tungsten carbide, CBN has a cutting speed three times faster and is twice as wearable.
Cutting Edge Angle
A 45° rake angle (KAPR) is the recommended cutting angle between the tungsten rod and the edge of the insert. This is because the tungsten rod and billet are usually formed by sintering and often brittle due to its large grain size. A correctly applied cutting angle in the cutting and turning can efficiently avoid the edge and surface from being cracked or layered.
In order to prevent the tool used to cut tungsten rod from wearing down, the feed rate needs to be gradually reduced while the insert is entering or exiting the tungsten working piece.
Tungsten Rod Applications And Properties
Tungsten rod is an ideal material to make thermal conductors, welding electrodes, headpieces for the industries of quartz, stirring bars for smelting, heavy hammers, fasteners, etc.
Tungsten Inert Gas (TIG) Welding
The extremely high melting point of tungsten rod makes it very well-suited to be machined into tungsten electrodes for GTAW and plasma welding. GTAW stands for Tungsten Inert Gas Welding, which is also called Heliarc welding. During the welding process, the tungsten electrode gets heated but doesn’t melt. Tungsten electrode is mostly non-consumable, meaning only a negligible amount of tungsten is consumed during each use.
Stirring Bars For Rear-earth Smelting
The stirring bar used for rare earth metal production by molten salt electrolysis needs to be highly resistant to high temperature and chemical erosion. Tungsten rod is an excellent material for making the stirring bar due to its high melting point and very stable chemical properties in a working temperature below 1400 °C. Compared with graphite, tungsten rod has a lower consumable rate and higher erosion resistance to the electrolyte.
Tungsten contact is a popular component cut from forged tungsten rod. It is widely used in high voltage and frequency switching operations such as circuit breakers, high voltage switches, and arcing contacts. Tungsten contact has a low surface evaporation rate, excellent arc resistance, and efficient electrical and thermal conductivity. The typical size of tungsten contacts are 2- 6 mm in diameter with a maximum 0.6 mm in thickness.
Uses of Tungsten Rods
- Furnace pillars for sapphire crystal furnaces and other vacuum furnaces
- Furnace heater for sapphire crystal furnaces and other vacuum furnaces
- Tungsten headpieces for the industries of quartz
- Stirring bars for glass smelting and rear-earth smelting
- Tungsten heavy hammers
- Connecting rods
- Screws/bolts and other fasteners
- Furnace support pillars
- Electrodes for welding electrodes and rare earth metal industry
Tungsten Rod Properties
- High Density: 19.25 g/cm³
- High Melting Point: 3422°C (6192 °F)
- Low Vapor Pressure
- High Tensile Strength
- Low Coefficient of Thermal Expansion
- Low Electrical Resistivity
- Good Machinability
- High Absorption Capacity
- High Elastic Modulus
Tungsten Alloy Rod
|Rod Diameter||0.029″ (0.75mm) – 5″ (127 mm)|
|Rod Length||0.15″ (3.81mm) – 40″ (1000mm)|
|Surface||Ground, Chemical Cleaned, Polished|
|Standard||Mil-T-21014, AMS-T-21014, ASTM B 777|
|Composition||W Ni Fe, W Ni Cu, W Cu|
Tungsten Alloy Rod Properties
CHEMETAL USA is a leading producer of tungsten heavy alloy rods including tungsten nickel iron alloy (W-Ni-Fe) rod, tungsten nickel copper alloy (W-Ni-Cu) rod. We offer tungsten heavy alloy rods with diameters ranging from 0.029″ to 4.0” or more. Tungsten heavy alloy rod contains tungsten content ranging from 80%-98% with small amounts of molybdenum, nickel, iron and copper elements. We can cut tungsten rod into varying lengths depending on the diameter of the rod chosen by the customer.