About 120 grades are added with titanium and more than 150 kinds of deformed steel. But the amount of addition is not much, between 0.02% -0.4%. Among about 40 types of cast iron and steel, 13 grades are added with titanium. Generally, the main purpose of adding titanium in 0.08% -0.35% is to refine the casting structure and weld structure, reduce the tendency of casting cracks to crack and improve the mechanical properties. The role of adding titanium is that titanium and aluminum form the compound TiAl as a non-spontaneous core, and the casting structure is refined when the steel solidifies. Sometimes, a small amount of B is added to form a TiB2 compound to promote Ti refinement.
Titanium can not only exist in the form of solid solution in the analysis of iron and steel, but also exist in the combined state of TiCTiO2TiN and other after-sales services to stabilize the carbon and nitrogen in the steel, which can prevent the generation of bubbles in the steel. It can improve the hardness of the steel and refine the grain, and can also reduce the aging sensitivity, cold brittleness and corrosion of the steel, thereby improving the quality and mechanical properties of the steel. It is generally considered that titanium content greater than 0.25% is called alloy element. The titanium content of stainless steel is 0.1% -2%. The content of titanium in some heat-resistant alloys and precision alloys can be as high as 2% -6%
One is to add intermediate titanium alloy with block or filament. The second is to add titanium additives. There are two methods for adding titanium to steel. The third of the addition of titanium element is the special refinement of the casting structure with the addition of a refining agent, not an alloy element, and no composition analysis.
Is an element that plays a role in refining the structure during the smelting and casting process. It is mixed with titanium powder and salt chemicals and pressed into a lump or cake for supply. There are generally three kinds of titanium content. 30% 40% and 60%, 1 titanium refiner. The element of titanium refiner in the alloy is not a component of the alloy. At the same time, add boron-containing salt (the boron content is 1%, 2%, 3% or 4%, and the rest is prepared by adding NaCl and KC1. The market supplies Ti40B4Ti30B4Ti30B3 and Ti60Bl and other products.
It should be noted that it can not absorb moisture or moisture, 2 titanium additives. The titanium additive is to adjust the titanium content in steel. Use titanium plus iron powder or flux salt to press into block or cake shape. The content of titanium powder is 55% -75% iron powder or flux salt 45% -25% into the molten steel according to the demand. If such additives use flux salts as ingredients. In fact, the flux salts in the product are useless and packaged pure metal powder is most suitable.
Method For Improving Wear Resistance Of Titanium Alloy Valve