Microstructure and properties of HB450 low-alloy ultra-high-strength wear-resistant steel

HB450 low alloy ultra-high-strength wear-resistant steel is an advanced construction material with superior properties. It is primarily composed of iron, carbon, and chromium. It is an excellent option for applications requiring long-term durability, along with superior wear resistance. The steel is designed to be highly resistant to abrasion, with good workability, weldability, and machinability.
    
Microstructure
The microstructure of HB450 steel is a martensitic crystal structure. The matrix of the martensite consists of a fine-grained ferrite and carbide phase, which provides excellent wear resistance and strength. The primary carbides are molybdenum, vanadium, titanium and niobium carbides, which provide superior wear resistance. The ferrite phase forms a tempered martensite layer that is capable of resisting fatigue.
    
Properties
HB450 low alloy ultra-high-strength wear-resistant steel has an ultra-high elongation at break of 1.5-2.5%. The tensile strength of this steel is up to 1450 MPa. The yield strength is 930 MPa, and the hardness is more than HRC 60. In addition, this steel has excellent resistance to abrasion, high temperature oxidation and good formability.
    
Applications
HB450 low alloy ultra-high-strength wear-resistant steel is widely used in applications requiring superior wear resistance and long-term durability. These include crusher components, buckets, conveyor variants, and shafts and components in the construction, mining, and agricultural machinery sectors. Additionally, it is often used in applications such as power generation plants, offshore oil and gas and nuclear power plants where wear-resistance, corrosion resistance and toughness are critical.
    
Weldability
HB450 low alloy ultra-high-strength wear-resistant steel is highly weldable. This steel has excellent weldability and can be welded using pre and post heat treatments. Welding of this steel should be followed by a post heat treatment, as it helps to reduce hardness deterioration and retain an ultra-high strength. It is recommended to use electrodes with solid wire 61 and 70.
    
Conclusion
HB450 low alloy ultra-high-strength wear-resistant steel is an advanced steel construction material, with superior properties such as ultra-high strength, excellent resistance to abrasion, and good weldability. This steel is used in a wide range of applications, including crusher components, buckets, conveyor variants, and shafts and components in the construction, mining, and agricultural machinery sectors, as well as in power generation plants, offshore oil and gas and nuclear power plants.

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