FIELD: metal working. SUBSTANCE: method allowing reduced metal loss when manufacturing large-diameter titanium-alloy pipes includes forging ingot with loss y = (1-1.25)Ain/Ast wherein minimum y value is 2.7, drilling central hole in the stock, heating it to a temperature above polymorphic transformation temperature, piercing on rotary pierce with no rise of diameter and stretching in the range 1.20-1.35, rolling on pilger seamless-tube mill, cooling in water and machining outer and inner surfaces. Value of permissible metal removal in machining process is regulated by a mathematical dependence. Method also reduces crack formation in alpha-treated layer of machined stock. EFFECT: reduced metal loss.
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