Titanium slab for hot rolling and process for producing same

Abstract

The present invention provides a titanium slab for hot rolling with good surface properties of a hot-rolled strip-shaped coil even if the preliminary rolling process is omitted in the titanium slab obtained by smelting industrial pure titanium, and the titanium slab Smelting method. The titanium slab of the present invention is a titanium slab for hot rolling obtained by smelting commercially pure titanium containing Fe as a β-phase stabilizing element. A titanium slab in which the average Fe concentration from the surface layer to 10 mm is specified to be 0.01% by mass or less to suppress the formation of coarse β phases. It can be obtained by cooling the titanium slab obtained by smelting industrial pure titanium until the surface reaches below the β transformation point, and then heating it above the β transformation point, and slowly cooling from the surface layer of the slab.

Description

technical field [0001] The present invention relates to a titanium slab for hot rolling of industrial pure titanium and a method for manufacturing the titanium slab. In particular, it relates to a method that can maintain the surface of a hot-rolled strip-shaped coil well even if a rectangular ingot produced by an electron beam melting method or a plasma arc melting method is directly hot-rolled without blanking, forging, or other preliminary rolling steps. A titanium slab for hot rolling and a manufacturing method thereof. Background technique [0002] As titanium and titanium alloys, ingots made of sponge titanium or titanium waste as raw materials, melted by vacuum consumable electric arc furnace melting method or electron beam melting method, and then solidified are generally used. These ingots are subjected to hot processing such as blanking, forging, and rolling, and processed into a rollable slab shape with a hot rolling mill, and then the surface is treated to becom...

AI Technical Summary

Problems solved by technology

However, in the TIG welding method of the arc heating method used industrially for titanium materials, it takes a long time to process a unit area.

In addition, melting methods other than arc heating also require high costs for the introduction of equipment for improving the surface structure of slabs

Also, e-beam heating etc. usually must be within 10 -5 The operation is carried out in a vacuum around Torr, which is greatly restricted by the equipment

In other words, it may lead to an increase in production costs

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