Achemetal Tungsten & Molybdenum Co., Ltd.
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Specification Tungsten heavy alloys material formed by adding a small amount of Ni, Fe, Cu, Co, Mo, Cr and other elements into tungsten (generally with the content of 80%~98%) serving as the basis. High-specific-gravity tungsten alloy has the density of 15.20~18.70g/cm3, and is also called high-specific-gravity alloy or high-density alloy material by people. High-specific-gravity tungsten alloy is mainly divided into two series, W-Ni-Fe (weakly magnetic) and W-Ni-Cu (non-magnetic) even W-Ni-Fe-Cu. By comparison, W-Ni-Fe alloy has a higher mechanical property and plays a great role in the national defence industry and various fields of national economy, is a very important military new material in the national defence industry, and is gradually generalized to all the civil industries.
a. Large specific gravity: the specific gravity is generally 16.5-18.75g/cm³;
b. High strength: the tensile strength is 700-1,000Mpa;
c. Strong ray absorption capacity: 30-40% higher than that of lead;
d. Large heat conducting coefficient: the heat conducting coefficient of tungsten alloy is 5 times that of mold steel;
e. Small thermal expansion coefficient: 1/2-1/3 of that of iron or steel;
f. Good conductivity: it can be widely applied to illumination and electric welding industries because of its good conductivity;
g. Good weldability and machinability.
Chemical composition
Components, density and hardness performance
| Level | Nominal tungsten content, weight % | Density,g/cm³ | Hardness AB, Rockwell C (largest) |
| 1 | 90 | 16.85～17.25 | 32 |
| 2 | 92.5 | 17.15～17.85 | 33 |
| 3 | 95 | 17.75～18.35 | 34 |
| 4 | 97 | 18.25～18.85 | 35 |
| A. Other hardness testing methods can be adopted if there are stipulations from demanders; | |||
Production Process
The lowest requirements on mechanical properties
| Level | Ultimate tensile strength | Yield strength (0.2% residual deformation) | Elongation (%) | ||
| Kilopound/inch 2 | MPa | Kilopound/inch 2 | MPa | ||
| 1 | 110B | 758 | 75 | 517 | 5B |
| 2 | 110B | 758 | 75 | 517 | 5B |
| 3 | 105B | 724 | 75 | 517 | 3B |
| 4 | 100 | 689 | 75 | 517 | 2B |
| A. Measure by an extensometer with the accuracy of lower than 0.5%. B. 1/2/3-level nonmagnetic materials have the lowest ultimate tensile strength of 94 kilopound/inch 2(648MPa); The minimum elongation: level 1 and level 2, 2%; level 3, 1% | |||||
Product Description
Gamma Knife is a gamma stereotactic radiation therapy system, the main structure of which is a hemispherical helmet covered with collimators, which emits high-dose ionized rays generated by cobalt 60, i.e. gamma rays. Through geometric focusing, the rays are focused on the target-target in the patient's body through stereotactic orientation.
The tungsten-based high specific gravity shielding material is used to focus the rays without causing damage to the patient's health and medical personnel due to radiation leakage.
Tungsten-based high specific gravity shielding materials are used for gamma knife shielding because they provide better shielding than lead and are more environmentally friendly than lead.
Tungsten-based high specific gravity shielding materials are used for gamma knife shielding because they provide better shielding than lead and are more environmentally friendly than lead.
Application
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