Method for preparing titanium plate billet

Abstract

The invention provides a method for preparing a titanium plate billet. The method comprises the steps of pressing titanium sponge into an electrode block, or evenly mixing the titanium sponge with an intermediate alloy and / or a metal as an alloy element and then pressing for the formation of the electrode block, welding the pressed electrode block into a cylindrical electrode and smelting the cylindrical electrode by adopting vacuum consumable electro-arc for the formation of a cylindrical cast ingot; peeling the obtained cylindrical cast ingot, then performing 90-180min heat preservation at a temperature of 800 to 850 DEG C, increasing the temperature to 950 to 1050 DEG C for 180-420min heat preservation and forging the cast ingot into a rectangular intermediate billet after the forging and drawing of one heating number; and finally performing hot-rolling and cogging on the obtained intermediate billet for the formation of the titanium plate billet. With the adoption of the method for preparing the titanium plate billet, the operation is convenient and the obtained titanium plate billet is small in thickness tolerance and good in surface quality.

Description

Technical field [0001] The invention relates to a method for preparing a titanium slab. Background technique [0002] Among titanium and titanium alloy processed materials, the output of titanium plate / coil accounts for about 80% of the total processing volume. It is widely used in aviation, aerospace, weapons, petrochemical, salt, chlor-alkali, hydrometallurgy, medical, papermaking, electroplating, electrolysis, etc. Industrial field. [0003] At present, there are two methods for the production of titanium (or titanium coil) slabs in China: one is to use forging, which is mainly to first press sponge titanium or recycled scrap titanium into electrode blocks, and then assemble and weld the electrode blocks into electrode rods. The welded titanium electrode rod is smelted in a vacuum consumable arc melting furnace for 2-3 times to finally form a cylindrical titanium ingot. The titanium ingot is heated and forged through multiple fires, and finally a rectangular slab is prepared. ...

AI Technical Summary

Problems solved by technology

When titanium slabs are produced by forging methods, it is difficult to control the thickness tolerance of the slabs, which makes it difficult to control the shape and dimensional accuracy of subsequent titanium plates or titanium coils.

At the same time, defects such as wrinkles and cracks produced during the forging process will also seriously affect the surface quality of subsequent hot-rolled coils, causing serious surface quality defects such as indentations, pits, wood grains, scratches, and heavy skins to appear on the surface of hot-rolled coils

In addition, due to the large difference in the thickness of the slab and the existence of forging defects on the surface, the amount of milling during the surface cleaning of the slab is also large, which seriously reduces the yield of the slab; in addition, the number of forging fires is high, the energy consumption is large, and the production efficiency is low, which reduces the economic benefit.

Although the die casting method can reduce the slab forging process, due to the large investment and high requirements for technical equipment, the method of producing titanium slabs by die casting is not yet mature in China and is rarely used.