The preparation of titanium slab method, the method including the sponge titanium electrodes pressed into pieces, or sponge titanium and alloy elements in the middle of the alloy and/or metal pressed into electrode block after mixing, will suppress piece of welding electrodes into cylindrical electrode, the cylindrical electrode adopts the vacuum arc smelting, power consumption for cylindrical casting; The cylindrical ingot will be skinned after holding at 800℃-850℃ for 90-180 minutes, and then heated to 950℃-1050℃ after holding 180-420 minutes, and then through a fire forging after drawing forged into a rectangular intermediate blank; Titanium slabs were obtained by hot rolling the intermediate blanks. According to the method of the invention, the operation is convenient, and the obtained titanium slab has small thickness tolerance and good surface quality.
There are two ways to produce titanium (or titanium coil) slabs: One is forged, the method is mainly to titanium sponge titanium or recycled waste material pressed into the electrode block, and then split welding electrodes into electrode stick, welded titanium electrode rod since the power vacuum arc furnace after 2-3 times in smelting and form cylindrical titanium ingot, titanium ingot after multiple fire heating and forging, the final preparation into section for rectangular slab. The second is to use molded, namely USES the vacuum consumable melting or electronic cold hearth melting solidification shell and then directly pouring into the production methods of titanium slab the method is to put the titanium sponge titanium or old material extrusion or pillars of welding electrodes, and then in a vacuum consumable of titanium electrodes in the furnace for melting, solidification shell casting titanium and titanium solution within the slab casting mould, mould can be titanium slab after cooling.
Forging is the main production method of titanium slab in China. It is difficult to control the tolerance of the thickness of the titanium slab produced by forging method, which makes it difficult to control the precision of the plate shape and dimension in the subsequent hot rolling of titanium plate or titanium coil. At the same time, the wrinkles, cracks and other defects in the forging process will also seriously affect the surface quality of the subsequent hot rolled sheet, resulting in serious surface quality defects such as pressing, pit, wood grain, abrasion and heavy skin. In addition, due to the large thickness difference of the slab and the existence of surface forging defects, the milling amount of the slab surface cleaning is also large, which seriously reduces the yield of the slab. In addition, the forging fire times, high energy consumption, low production efficiency, reduce the economic benefit. Although die casting method can reduce the forging process of slab, it is not mature and seldom used in China because of high investment and high requirement of technical equipment conditions.
