Application Areas of Wear-resistant Steel NM550

Structural Characteristics of Low Alloy Wear-resistant Steel

• Low alloy wear-resistant steel refers to the low cost wear-resistant properties obtained on the basis of alloy structural steel through multi-component alloying smelting, late quenching, low temperature tempering and other means.
• The microstructure of low-alloy wear-resistant steel is usually martensite or bainite, which has the characteristics of high strength and hardness. For example, NM550 has a hardness of up to 550HBW and a tensile strength of ≥ 1250MPa. By heat treatment (such as quenching+tempering), its structure can be further optimized to maintain high hardness while having good toughness and fatigue resistance.

• The development of low-alloy wear-resistant steel has contributed to the chemical composition of alloy structural steel, but the prefabrication process has made devastating improvements, especially in the combination of heat treatment process and alloy structural steel. Most of them adopt the heat treatment process of quenching and low-temperature tempering, considering high strength, high hardness and certain strength, to meet the requirements of wear resistance. Due to the low alloy steel composition of low-alloy wear-resistant steel, the cost advantage is significant. Under sparse conditions, especially under low or no impact conditions, high alloy steel gradually deteriorates.
• In foreign countries, low-alloy wear-resistant steels are mainly Cr, M. or Cr, Ni, Mo alloy steels. In China, Si, Mn alloy steels that meet China’s alloy resources have been developed for a long time. Later on, people gradually realized that using multi-element alloying was an effective way to improve the hardenability, strength, and hardness of wear-resistant steel. Therefore, in recent years, Cr, Mo, Ni, Si, and Mn multi-element alloying has been mainly used for medium and low alloy wear-resistant steel.
• Wear resistant steel is divided into ordinary, impact resistant, and high-temperature resistant transparent types: the total thickness of wear-resistant steel is close to 5.5 (2.5+3) mm, and the thickness is close to 30 (15+15) mm; Wear resistant steel can be rolled into small-diameter DN200 wear-resistant pipes, and can be processed into wear-resistant elbows, wear-resistant tees, and wear-resistant reducers.
• Wear resistant steel bending: Wear resistant steel can be bent 90 degrees according to the Chinese standard GBT24186-2022, D=6A。 Except for wear-resistant steel plates larger than 4MM, a tool with a bending head diameter equal to 6 times the thickness can be used for bending. Taking 6MM as an example, use a pressure head with a diameter of not less than 36MM when bending, and do not use pointed tools for bending. In addition, the strength of wear-resistant steel is also good. Taking NM400 as an example, its tensile Rm strength is around 1100MPA, so it is necessary to choose a machine with sufficient strength during processing.

Mechanical Properties

Chemical Composition

• Adding trace amounts of niobium can improve the various properties of steel and make welding easier.
• C has a significant impact on the welding performance of steel. The reason why NM400 is easier to weld than 550 is due to the difference in carbon content. When the content of C in steel exceeds 0.23%, the welding performance of steel deteriorates. The alloy used for welding generally has a C content of no more than 0.2%.
• The content of Cr in steel affects plasticity, toughness, and bending performance. Increasing the content of Cr to a certain extent will reduce the plasticity, toughness, and bending performance of steel plates.

Applications of NM550

• Wear resistant steel plates have high wear resistance and good impact performance, and can be cut, bent, welded, etc. They can be connected to other structures by welding, plug welding, bolt connection, etc. They have the characteristics of time-saving and convenience in the maintenance process, and are widely used in metallurgy, coal, cement, electricity, glass, mining, building materials, brick and tile industries. Compared with other materials, they have high cost-effectiveness and have been favored by more and more industries and manufacturers.
• NM550 steel wear-resistant plate ensures unparalleled performance, saves and enhances equipment lifespan. Whether you want to reduce weight or increase strength in applications such as truck bodies, dump truck bodies, containers, and buckets, or if you need wear-resistant parts with a lifespan far exceeding other materials, NM550 is the best choice.
• The outstanding performance characteristics of NM550 wear-resistant plate come from the combination of hardness, strength, and toughness. Therefore, NM550 can withstand sliding, impact, and compression wear. NM550 goes beyond wear resistance, allowing you to protect equipment investments and work more efficiently.
• In truck bodies and containers, NM550 ensures longer service life and highly predictable performance. Its high strength and hardness typically allow for the use of thinner steel plates, resulting in higher load-bearing capacity and better fuel economy.
• NM550 means longer equipment life and higher reliability in your hopper, thanks to excellent wear resistance and deformation resistance. Due to the uniform distribution of wear resistance on the surface of NM550, enhanced performance has been achieved.

The main application areas of NM550:

Mining Machinery

• In the field of mining machinery, NM550 wear-resistant plates are widely used in the wear-resistant parts of excavators, loaders, crushers, ball mills and other equipment. These equipment need to withstand high-intensity wear and impact during operation, and the high strength and wear resistance of NM550 wear-resistant plates can effectively extend the service life of the equipment and improve its work efficiency.

Metallurgical Machinery

• In the field of metallurgical machinery, NM550 wear-resistant plates are widely used in various wear-resistant parts, such as blast furnace tops, converter liners, continuous casting machine rollers, etc. These parts need to withstand harsh conditions such as high temperature, high pressure, and high wear during operation. The high strength and wear resistance of NM550 wear-resistant plates can effectively ensure the normal operation of equipment and reduce the number of equipment maintenance and replacement times.

Cement Machinery

• In the field of cement machinery, NM550 wear-resistant plates are widely used in wear-resistant parts such as cement mills, cyclone dust collectors, and conveying equipment. These parts need to withstand harsh conditions such as high-speed wear and dust corrosion during operation. The high wear resistance and corrosion resistance of NM550 wear-resistant plates can effectively protect equipment and extend its service life.

Crushing Machinery

• In the field of crushing machinery, NM550 wear-resistant plates are widely used in the moving jaw plate, fixed jaw plate, and toothed plate of jaw crushers, the hammer head and plate hammer of hammer crushers, the impact plate of impact crushers, and the lining plate and rolling bowl wall of cone crushers. These supplements need to withstand high-intensity impact and wear during operation. The high hardness, high wear resistance, and high toughness of NM550 can significantly improve the stability and service life of equipment.

Others

• In addition to the above fields, NM550 wear-resistant plate is also widely used in the manufacturing of various wear-resistant parts in other fields, such as engineering machinery, agricultural machinery, chemical machinery, etc. Its high strength, high wear resistance, and good processing performance make it have broad application prospects in various fields.

Conclusion

• Overall, NM550 wear-resistant steel has become a key material in mining machinery, metallurgical machinery, cement machinery, and crushing machinery due to its high strength, high wear resistance, and good toughness. It can not only significantly improve the service life and operational efficiency of equipment, but also reduce equipment maintenance costs and downtime. With the continuous advancement of technology, the application scope of NM550 will be further expanded, providing more efficient and reliable solutions for industrial production.