Why do we need hardness requirements for titanium screws?

Titanium tube is similar to other metals. The shrinkage behavior of titanium tube during casting also undergoes a change from liquid to solid state and then to solid state. This shrinkage behavior is usually divided into volume shrinkage and linear shrinkage. The volume shrinkage reflects the change of the entire volume of the titanium tube during the casting process. Since the total volume shrinkage is equal to the volume of the concentrated shrinkage cavity of the casting plus the volume of the shrinkage porosity, the solidification shrinkage behavior of the alloy casting process is related to the volume shrinkage of the alloy. It determines the characteristics of shrinkage cavity and shrinkage porosity of the drill alloy, which is of great significance for understanding the formation of shrinkage cavity and shrinkage porosity defects of titanium pipes.

Titanium tube

Important factors affecting the solidification and shrinkage of titanium tubes include alloying elements, mold materials and mold structures. Because alloying elements affect the crystallization temperature interval of the titanium tube, just like its influence on fluidity, the solidification shrinkage of the titanium tube first depends on the characteristics of the added alloying element, that is, the crystallization temperature formed between titanium and alloying elements The size of the interval is related. Eutectic titanium tubes with narrow crystallization temperature intervals have good fluidity and are easy to form concentrated shrinkage cavities, while titanium tubes with wide crystallization temperature intervals have poor fluidity and are easy to form dispersive shrinkage cavities, that is, shrinkage porosity.

Because titanium tube has a series of good physical properties, as an excellent structural material, it can compete with stainless steel and nickel alloy for the scope of application: in many sectors of the national economy, the use of titanium tube increases product life and improves The reliability and productivity of the equipment speed up the process and improve the working conditions, all of which have achieved significant economic benefits.
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