Pyongyang, August 3 (KCNA) — The Ministry of Metal Industry of the Democratic People’s Republic of Korea has developed a new method of producing titanium cast-iron ball by direct alloyage.
It has been known that the Ti-alloyed iron is made by the thermite reduction. This method is high in cost and low in productivity.
By the new method, it is possible to directly alloy Ti with the arc heat of electric furnace and the heat produced in the reaction between a by-product of aluminum production and the carbon, silicon and calcium contained in the burden materials.
Ti cast-iron ball made by the new method contains more than 2.5 percent of C, 0.2-0.4 percent of Ti and less than 0.04 percent of phosphorus and sulfur. And its hardness is HRC55.
Its serviceable life is 2-2.5 times longer and its consumption is lower than other kinds. And it saves heavy oil, electricity and manpower and shortens production hours compared with rolled ball.
The Ti cast-iron ball has already been used in coal-pulverizing in thermal power plants and the concentrated ore production in mines.
Image credit: https://www.flickr.com/photos/pricey/523089441/