Tungsten-nickel-iron alloy has the characteristics of high strength and high hardness. Its tensile strength is generally 700-1000MPa, and the hardness may vary according to different grades and production processes, usually between 24-36HRC.

The strength and hardness of tungsten-Ni-iron alloy make it widely used in many fields, such as the manufacture of components of gyroscopes, armor piercing cores, radiation shielding materials. At the same time, its good shape, workability and weldability also provide convenience for its processing and use.

The strength and hardness of tungsten-Ni-iron alloy are mainly affected by the following factors:

1. Composition ratio: The proportion of tungsten, nickel and iron content has a significant impact on the properties of the alloy. Generally speaking, the increase of tungsten content will increase the strength and hardness of the alloy.
2. Microstructure: including grain size, grain boundary characteristics and phase composition. The fine and uniform grain can enhance the strength and hardness of the alloy. Different phase compositions and distributions also affect performance.
3. Manufacturing process: such as sintering temperature, pressure and time. Appropriate sintering conditions can promote the densification of the alloy, reduce the porosity, and thus improve the strength and hardness.
4. Follow-up treatment: such as heat treatment, cold processing, etc. Heat treatment can change the microstructure of the alloy, thus adjusting the strength and hardness; Cold working can produce work hardening effect and improve strength.
5. Impurity content: The presence of impurity elements may weaken the grain boundary binding force and reduce the strength and hardness of the alloy.

The interaction of these factors together determines the strength and hardness characteristics of tungsten-Ni-Fe alloy. In practical applications, through reasonable control of these factors, we can obtain the performance to meet the specific requirements.