The NM450 vs NM400 material
The NM400 and NM450 steel materials are two kinds of wear-resistant steel grades produced by the industrial company, Nippon Steel. Both these steels are designed to optimize wear and abrasion resistance by providing a combination of high hardness and good ductility, which makes them suitable for use in a variety of applications. While they share many similar features, the NM400 and NM450 steel grades have different chemical compositions and physical properties, leading to differences in performance.
NM450 is the higher grade of the two steel materials. It offers a greater level of hardness and higher wear resistance than its NM400 counterpart, making it suitable for applications where increased durability is needed. It also contains additional elements, such as aluminium (Al), titanium (Ti) and chromium (Cr). These elements improve NM450’s corrosion resistance and make it more ductile. The Al and Ti also increase the steel grade’s strength and heat resistance. NM450 has a minimum hardness of HB450 on the Brinell hardness scale and a maximum hardness of HB500.
Unlike NM450, NM400 does not contain additional elements like Al, Ti or Cr. Therefore, it is less resistant to ridging and offers a lower level of hardness and wear resistance. On the Brinell hardness scale, NM400 has a minimum hardness of HB400 and a maximum of HB450. In comparison to NM450, NM400 has a lower melting point, making it less resistant to temperature changes. Despite this, NM400 is still suited for many applications due to its excellent weldability and resistance to surface tear.
When comparing NM400 and NM450, it is important to look at the differences in their chemical compositions. NM450 has a higher carbon content than NM400, as well as a higher phosphorus and sulphur content. This gives NM450 greater strength and hardenability than NM400. NM450 also contains additional alloying elements, such as chromium, molybdenum, aluminium, titanium and vanadium. These elements provide additional corrosion resistance, increased tensile strength and improved toughness.
In terms of physical properties, NM450 has higher yield and tensile strength than NM400. It also has greater cold and hot formability as well as superior machinability. NM450 is therefore better suited for applications that require more demanding working conditions. On the other hand, NM400 is often preferred for applications that do not require such high levels of strength or machinability, as its lower hardness and wear resistance make it more cost-effective.
Overall, both NM400 and NM450 are popular wear-resistant steel grades due to their outstanding properties. NM450 offers superior performance in areas where increased wear and abrasion resistance are required, while NM400 is the preferred choice for less demanding applications. Its wide range of benefits makes it an ideal choice for many different industries.
