Abstract: A process for manufacturing welded titanium alloy tubes and pipes having good corrosion resistance and good mechanical properties from a titanium alloy which consists essentially, by weight, of one or more of the platinum group metals in a total amount of 0.01-0.14%, at least one of Ni and Co each in an amount of 0.1%-2.0%, not more than 0.35% of oxygen, not more than 0.30% of iron, optionally at least one of Mo, W, and V each in an amount of 0.1%-2.0%, and a balance of Ti. The process comprises preparing a slab by hot working from an ingot of the titanium alloy after heating in a temperature range of from 750.degree. C. to a temperature 200.degree. C. above the beta-transus point, hot-rolling the slab with a finishing temperature of not lower than 400.degree. C. to form a hot-rolled strip after heating in a temperature range of from 650.degree. C. to a temperature 150.degree. C. above the beta-transus point, optionally performing annealing in a temperature range of from 550.degree. C. to a temperature 20.

Abstract: A wear-resistant titanium alloy containing titanium carbides which are crystallized and/or precipitated and are dispersed in the .beta.-phase matrix is disclosed. The alloy may further comprise .alpha.-phase and/or additional hard particles dispersed in the .beta.-phase matrix.

Abstract: A process for manufacturing seamless titanium alloy tubes or pipes having good corrosion resistance and good mechanical properties from a titanium alloy which consists essentially, by weight, of one or more of the platinum group metals in a total amount of 0.01-0.14%, at least one of Ni and Co each in an amount of 0.1%-2.0%, no more than 0.35% of oxygen, not more than 0.30% of iron, optionally at least one of Mo, W, and V each in an amount of 0.1%-2.0%, and a balance of Ti. The process comprises preparing a billet by hot working after preheating in a temperature range of from 650.degree. C. to a temperature 100.degree. C. above the beta-transus point and subjecting the billet to tube extrusion after preheating in a temperature range of from 650.degree. C. to a temperature 100.degree. C. above the beta-transus point, optionally followed by at least one of annealing, cold drawing, and cold or warm rolling.

Abstract: A wear-resistant titanium alloy containing titanium carbides which are crystallized and/or precipitated and are dispersed in the .beta.-phase matrix is disclosed. The alloy may further comprise .alpha.-phase and/or additional hard particles dispersed in the .beta.-phase matrix.

Abstract: A method of manufacturing a seamless tube formed of a titanium material, such as pure titanium or titanium alloys, by the use of the Mannesmann's method. At first, an ingot formed of the titanium material is processed under the conditions that a heating temperature is 850.degree. to 1,250.degree. C., the final temperature being 600.degree. to 1,100.degree. C., and a working degree being 50% or more so as to be turned into a solid billet. The resulting solid billet is subjected to a piercing within a temperature range of .beta. transus -100.degree. to 1,250.degree. C. so as to be turned into a hollow piece. In this piercing process, inclined rolls of a piercer are descaled. The resulting hollow piece is, in case of need, regulated a size thereof by elongating so as to be turned into a hollow shell. Subsequently, the resulting hollow shell is subjected to a reducing step (reducing conditions: temperature at an inlet side of the mill is 600.degree. to 1,100.degree. C.

Abstract: A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentially of, in % by weight:______________________________________ C: not more than 0.05%, Si: 0.1-2.0%, Mn: not more than 2.0%, Cr: 18-26%, Ni: 16-30%, ______________________________________at least one of Mo: 0.5-4.0%, W: 0.01-4.00%, andV: 0.01-4.00%,N: 0-0.25%,(Ti+Nb): 0-1.5%, andthe balance iron and incidental impurities.

Abstract: A method of improving the resistance of oil-well tubular products made of .alpha.-type or (.alpha.+.beta.)-type Ti-based alloys to corrosion in a deep-well environment at high temperatures is disclosed. The method is characterized by adding, as an alloying element, (A) at least one platinum group metal in an amount of 0.02-0.20% by weight, or (B) at least one platinum group metal in an amount of 0.005-0.12% by weight and optionally at least one of Ni, Co, W, and Mo in an amount of 0.05-2.00% by weight.

Abstract: A denture base of pressure-formed, superplastic alloy plate, and a method of making a metal denture base, includes providing a superplastic alloy plate and a female die having a finishing surface, and pressure-forming the alloy plate on the finishing surface of the female die at a temperature where the alloy exhibits superplasticity.

Abstract: A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentially of, in % by weight:C: not more than 0.05%,Si: 0.1-2.0%, Mn: not more than 2.0%,Cr: 18-26%, Ni: 16-30%,at least one of Mo: 0.5-4.0%, W: 0.01-4.00%, andV: 0.01-4.00%,N: 0-0.25%,(Ti+Nb): 0-1.5%, andthe balance iron and incidental impurities.

Abstract: A process for producing heat-resistant ferritic stainless steel sheet which exhibits improved toughness and productivity is disclosed. The process comprises the following steps:(a) hot rolling a steel with a finishing temperature of not higher than 850.degree. C., said steel comprising, by weight %,C: not more than 0.07%,Si: 1.5-3.5%,Mn: not more than 2.0%,Cr: 10-25% ,N: not more than 0.05%,Nb: 5X(C %+N %)-20X(C %+N %),optionally at least one element selected from the group consisting of Al, Y, Ca, and REM in a total amount of 0.3% or less, andthe balance iron and incidental impurities; and(b) annealing the resulting hot rolled steel sheet at a temperature of 820.degree.-1000.degree. C.Cold rolling may be applied to the annealed hot-rolled steel sheet.