The new steel type, inspired by the bone structure, can make our building stronger. This material is stronger than our current steel and it can even heal its own cracks.
Types of air preheater in a boiler
The air preheaters are classified into two types based on their features and construction. These two types of air preheater are
Recuperative or Tubular type air preheater
Regenerative or Rotational type air preheater
Recuperative or Tubular type air preheater is further classified into two types, they are
Horizontal tubular type
Vertical tubular type
Regenerative or Rotational type air preheater is also classified into two types they are
Rotating baskets (Ljungstrom)
Rotating hood (Rothemuhle)
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To create a powerful steel grade, scientists thought of the design of the bones, which is lightweight but not cracking. This is because, internally, the skeletal structure resembles a lattice, and all these different patterns and connections can resist different forms of stress. (This feature is called "hierarchical microstructure.") Therefore, the researchers designed the steel to design in a similar way. 
We use steel from infrastructure to train planes. This is a very common material, but after a while, discovering tiny cracks may cause it to suddenly break. Don't worry, this doesn't mean that everything is insecure, just the use of steel requires a more expensive build.
This is why researchers create more resilient steels. This new form of steel is the creation of overlapping layers. This means that even if the crack starts at the first layer, it may not spread to the other. Different parts of the layers have different hardnesses and work together to enhance the material. This design can even contain a crack to prevent it from spreading more.
Researchers say that this material will be more expensive than ordinary steel, but it may save money because you need to use it less.
Air preheater is one of the most important accessories in modern boilers. Air preheater is commonly found in all modern boilers. To increase the efficiency of the boiler accessories like air preheater is used in the boilers.