The hardness of NM450 steel
NM450 steel is a type of wear-resistant alloy that is composed primarily of chromium, nickel, and molybdenum. It is a medium-to-high strength, quench-and-tempered steel with an impressive combination of excellent wear resistance and impact protection. Compared to other alloys with similar composition, such as NM500, NM450 steel offers improved hardness, making it an ideal choice for components subjected to extreme wear.
NM450 steel is formed through a quenching and tempering process, resulting in a product with an impressive combination of toughness and wear resistance. Quenching and tempering typically requires the material to be heated to temperatures as high as 980°C (1,810°F) and then cooled in oil or air. As a result, temperatures during the quenching and tempering process have a meaningful impact on the final properties of the material.
As a result of the heat treatment, the hardness of NM450 steel typically ranges from 450 to 550HV (Vickers hardness scales) with a maximum hardness of up to 600HV. The high hardness levels of NM450 make it a great choice for components in architectural applications or other environments where wear is a concern, as the high hardness of NM450 steel will ensure the protruding components maintain their integrity even after long-term exposure to high levels of friction.
The high levels of hardness also contribute to excellent wear resistance and impact protection, making NM450 steel ideal for components that are subject to both extreme wear and shock loads. This makes the alloy well-suited for applications such as crusher parts, underground mining equipment, construction equipment, and powerful tools used in the construction industry.
However, the high hardness levels of NM450 steel can also lead to decreased formability. While the impact protections afforded by NM450 will make it resistant to mechanical shocks and abrasion, its formability can be diminished due to its high hardness. To help alleviate this issue, designers can use special tooling and die designs to work with the harder material, or select thicker material to increase the alloy’s formability.
Overall, NM450 steel offers an impressive combination of wear resistance, impact protection, and hardness. Its excellent wear resistance and impact protection makes it an ideal choice for components that are subjected to extreme wear and abrasive conditions such as those found in the mining and construction industries. The high levels of hardness, however, can lead to decreased formability and designers must take this into consideration when designing components in order to ensure the desired formability is achieved.
