Tungsten Wire-Tungsten-Product Display-Luoyang Mengchang Metal Materials Co., Ltd.

Tungsten Wire

Material Properties

The melting point of tungsten is 3420 º C, the boiling point is 5660 ℃, and the density is 19.3g/cm ³， Insoluble in water, it is a transition metal element with an atomic radius of 139pm and an electronegativity of 1.7. It is a silvery white and shiny metal with extremely excellent high-temperature strength. It also has very good corrosion resistance to molten alkali metals and steam. It’s extremely high thermal stability ensures that it can still work normally in high temperature environment. Tungsten has the characteristics of high melting point, high strength and hardness, good high temperature performance, low resistivity, small expansion coefficient and small electronic work escape. It is a widely used high temperature resistant metal material.

Craftsmanship

Raw Material

Starting from raw materials, we select high-quality raw materials, which is very prominent in the stability and consistency of products. Identify different brands of raw materials and mark the batch number. And each batch of raw materials shall be sampled, inspected and archived. Ensure the traceability of each finished product and continuously improve the product quality.

Milling

The control of the milling process of Mengchang Metal products is very accurate, with several large mixers and vibration platforms to ensure that the materials in the pulverizing and mixing process can be fully stirred and evenly distributed, so as to ensure the internal organization consistency of the products.

Suppress

In the process of powder compacting, the powder is pressed by isostatic pressing equipment to make its internal structure uniform and dense. Mengchang has very perfect batch mold, and also has isostatic pressing equipment to meet the production of ultra-large batches of products.

Sinter

In powder metallurgy, after the metal powder is formed by isostatic pressing, it is heated at a temperature lower than the melting point of the main components to make the particles connect, so as to improve the performance of the products, which is called sintering. After the powder is formed, the dense body obtained by sintering is a kind of polycrystalline material. The sintering process directly affects the grain size, pore size and grain boundary shape and distribution in the microstructure, which is the core process of powder metallurgy.

Forging

The forging process can make the material obtain higher density, better mechanical properties, and play a role in strengthening the surface. Accurate control of the processing rate and forging temperature of tungsten and molybdenum materials is an important factor for the superior performance of Mengchang tungsten and molybdenum materials. A processing method of using a forging machine to apply pressure to a metal blank to plastically deform it to obtain a forging with certain mechanical properties, certain shape and size.

Rolling

The rolling process makes the metal material produce continuous plastic deformation under the pressure of the rotating roll, and obtain the required section shape and properties. With advanced tungsten and molybdenum cold and hot rolling technology and equipment, from tungsten and molybdenum metal blank to the production of tungsten and molybdenum foil, mengchang guarantees you more advanced production technology and superior metal properties.

Heat-Treat

After the forging and rolling process, the material is subjected to the heat treatment process to completely eliminate the internal structural stress of the material, give play to the material performance, and make the material easier for subsequent machining. Mengchang has dozens of vacuum furnaces and heat treatment hydrogen furnaces to meet the rapid delivery of mass production orders.

Machining

The material of Mengchanghas undergone complete heat treatment, and then processed into various customized sizes by machining equipment such as turning, milling, cutting, grinding, etc., and ensures that the internal organization of tungsten and molybdenum materials is tight, stress-free and hole-free, which can meet the needs of customers.

Quality Assurance

Quality inspection and control will be carried out from raw materialsand for each steps of the production , so as to continuously ensure the quality every product. At the same time, when finished products are delivered from the warehouse, the appearance, size and internal organization of materials are tested one by one. Therefore, the stability and consistency of products are especially prominent.

Raw Material

Milling

Suppress

Sinter

Forging

Rolling

Heat-Treat

Machining

Quality Assurance

Chemical Composition

Type	Tungsten content	Impurity Element Content
Type	Tungsten content	Total Content	Content Of Each Element
WAL1、WAL2	≥99.95%	≤0.05%	≤0.01%
W1	≥99.95%	≤0.05%	≤0.01%
W2	≥99.92%	≤0.08%	≤0.01%

Product Specifications

Diameter(μm)	200mm Weight of wire segment	200mmWeight tolerance of wire segment (％)			Diameter tolerance（％）
Diameter(μm)	200mm Weight of wire segment	Grade 0	GradeⅠ	Grade Ⅱ	Grade 0	GradeⅠ	Grade Ⅱ
5≤d≤12	0.075~0.44	－	±4	±5	－	－	－
12<d≤18	>0.44~0.98	－	±3	±4	－	－	－
18<d≤40	>0.98~4.85	±2	±2.5	±3	－	－	－
40<d≤80	>4.85~19.39	±1.5	±2.0	±2.5	－	－	－
80<d≤300	>19.39~272.71	±1.0	±1.5	±2.0	－	－	－
300<d≤350	>272.71~371.79	－	±1.0	±1.5	－	－	－
350<d≤500	－	－	±1.5	±2.0	±2.5
500<d≤1800	－	－			±1.0	±1.5	±2.0

Appearance: the surface of tungsten wire is coated with graphite emulsion, which is relatively uniform black. After removing the graphite emulsion, it is metallic luster.

Applications

Manufacturing electric light source and electric vacuum parts

Used as high temperature heater and high temperature structural parts

Used to make tungsten spiral for vacuum evaporation

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