Tungsten-nickel-iron alloy is the main material for manufacturing high-density tungsten alloy dumbbells. It is made of tungsten, nickel, and iron powders by mixing, pressing and sintering, and has certain material advantages. Among them, the content of tungsten is the largest, reaching 80% to 90%, while nickel and iron play the role of bonding agent. After liquid phase sintering, a two-phase alloy is formed, and the density is close to the theoretical density. Nickel is an essential element in the liquid phase sintering process, and its content is generally 0.5% to 12%. If it is greater than 12%, the heat resistance and corrosion resistance of the alloy will be reduced. The iron content is generally between 0.5% and 8%. If it is greater than 8%, the brittleness of the alloy will increase. Iron can increase the strength and plasticity in this alloy, and this type of alloy has a certain degree of magnetism. Because the alloy achieves full density between the metals through the sintering process, its density can reach 18.6g/cm^3, which is an important material for weight products. Compared with tungsten-nickel-copper alloy, the strength and plasticity of this alloy are better. Tungsten-nickel-iron alloy has excellent physical and mechanical properties, including high density, high strength, low expansion coefficient, corrosion resistance, high temperature oxidation resistance and good machinability, etc., and has been rapidly developed and widely used, but the alloy It has certain magnetic properties, and its strength and plasticity are better than tungsten-nickel-copper alloy. Using this alloy to manufacture high-density tungsten alloy dumbbells, on the one hand, the high-density tungsten alloy has high density and can meet certain weight requirements. On the other hand, high-density tungsten alloy materials are resistant to corrosion and oxidation. Dumbbells are often in contact with the air. The metal is easy to oxidize in the season of high air humidity. This feature of high-density tungsten alloy can ensure the long-lasting luster of dumbbells and greatly extend the use of dumbbells. life.