What Is Pure Tungsten Rod?
Pure tungsten rods are made from tungsten with a purity of 99.95% or higher. Tungsten is a metal known for its extremely high melting point, high density, high hardness, and excellent electrical and thermal conductivity. Due to their unique physical and chemical properties, pure tungsten rods are widely used in electronics, lighting, medical equipment, high-temperature furnaces, aerospace, military, and other high-tech industries. For example, they can serve as electrodes, filaments, heating elements, or support pieces in high-temperature environments for electronic products. Pure tungsten rods are also used in the manufacturing of various tungsten products, such as tungsten wire, tungsten plates, and other tungsten shapes.
SURFACE FINISH
●Black – The surface is “as swaged” or “as drawn,” retaining a coating of processing lubricants and oxides.
●Cleaned – The surface is chemically cleaned to remove all lubricants and oxides.
●Ground – The surface is centerless ground to remove all coating and to achieve precise diameter control.
Material Specifications
| ●Forged Tungsten Rods Purity: W≥99.95%; Density: ≥19.0g/cm³; Straightness: ≤1%; | ●Sintered Tungsten Rods Purity: W≥99.95%; Density: ≥18.3g/cm³; Straightness: ≤2% |
Dimensions and Tolerances(mm)
| Surface Condition | Swaged | Drawn | Chemical Cleaned/Electropolished | Polished | Length Tolerance | ||||
| Dimensions | Diameter Tolerance | Ovality | Diameter Tolerance | Ovality | Diameter Tolerance | Ovality | Diameter Tolerance | Ovality | |
| 0.2≤d<0.5 | - | - | ±0.01 | 0.01 | ±0.01 | 0.01 | - | - | L<100±1.0 100≤L<300±1.5 300≤L< 500±2.0 500≤L<1000±2.5 1000≤L< 2000±5.0 |
| 0.5≤d<0.8 | - | - | ±0.02 | 0.02 | ±0.02 | 0.02 | ±0.01 | 0.01 | |
| 0.8≤d<1.0 | _ | - | ±0.02 | 0.02 | ±0.02 | 0.02 | ±0.02 | 0.02. | |
| 1.0≤d<1.8 | - | - | ±0.03 | 0.03 | ±0.03 | 0.03 | ±0.02 | 0.02. | |
| 1.8≤d<3.0 | - | - | ±0.05 | 0.05 | ±0.05 | 0.05 | ±0.03 | 0.03 | |
| 3.0≤d<5.5 | ±0.1 | - | ±0.1 | 0.1 | ±0.1 | 0.1 | ±0.05 | 0.05 | |
| 5.5≤d<9.0 | ±0.2 | - | - | - | - | - | ±0.08 | 0.08. | |
| 9.0≤d<13.0 | ±0.3 | - | - | - | - | - | ±0.1 | 0.1 | |
| 13.0≤d<18.0 | ±0.4 | - | - | - | - | - | - | - | |
| Note: Tungsten rods (bars) with a diameter d < 0.2mm or d ≥ 100mm can be customized according to customer requirements; Ovality: dmax - dmin | |||||||||
Process and Equipment
| Sintered Tungsten Rod | No. | Production Process | Production Equipment | Quality Inspection Focus |
| 1 | Tungsten Powder (Raw Material) | 1.Purity of Tungsten Powder | ||
| 2 | Sieving | High-Frequency Vibrating Screen | 2.Tungsten Powder Fsss after Batching | |
| 3 | Batching | V-Type Mixer | ||
| 4 | Inspection | |||
| 5 | Isostatic Pressing | Isostatic Press | 1.External Dimensions；2 Individual Weight； | |
| 6 | Inspection | 3.Surface Quality | ||
| 7 | Medium Frequency Sintering | Medium Frequency Induction Sintering Furnace | 1.External Dimensions, Individual Weight, Density | |
| 8 | Straightening | 200 Ton Four-Column Press | 2.Straightness | |
| 9 | Inspection | 3.Surface Quality | ||
| 10 | Packaging | 4.Provide Quality Certificate | ||
| Forged Tungsten Rod | No. | Production Process | Production Equipment | Quality Inspection Focus |
| 1 | Sintered Tungsten Rod | 1.Product Density | ||
| 2 | Forging | Swaging Equipment or Forging Air Hammer | 2.External Dimensions | |
| 3 | Machining | Lathe, Grinding Machine, etc. | 3.Straightness | |
| 4 | Inspection | 4.Surface Quality | ||
| 5 | Packaging | 5.Provide Quality Certificate | ||
Applications
▲Electronics and Lighting: Manufacturing of emission cathodes, high-temperature mandrels, supports, lead-in wires, printer needles, and various electrodes.
▲Quartz, Glass Melting & Rare Earth Smelting Industries: Tungsten electrodes, stirring rods, and flow orifices.
▲Single Crystal Silicon Industry: Tungsten heavy hammers, connecting rods, tungsten wire ropes, screws, and other fasteners.
▲Vacuum Furnace Heating Elements:Support tungsten columns, trays, Tungsten rod heaters and tungsten wire mesh heaters and tungsten standing posts for sapphire crystal furnaces.
▲Welding and Spark Erosion: Tungsten electrodes for welding, multi-element tungsten electrodes for rare earths, and spark erosion electrodes.
▲Radiation Shielding and Military Applications: Containers for radiation shielding in the nuclear industry, military, aerospace, and medical containers for radiation therapy.
