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High-strength and high-toughness titanium alloy pipe and production method thereof
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The technology of a tough titanium alloy and a production method is applied in the field of high-strength and high-toughness titanium alloy pipe and its production, and can solve the problems of difficult development and processing technology of titanium alloy pipe, difficulty in production of titanium alloy pipe, and difficulty in processing and forming, etc. Achieve the effect of avoiding the problem of material utilization, precise size and excellent performance
Active Publication Date: 2017-06-20
TIANJIN STEEL PIPE MFG CO LTD
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[0003] In addition, titanium alloy has the characteristics of high strength, difficult deformation, and extremely difficult processing and forming, which makes the development and processing technology of titanium alloy tubes difficult, and the production of high-strength and high-toughness titanium alloy tubes is even more difficult.
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Embodiment 1
[0024] (1) Smelting: Grade 1 high-quality titanium sponge is used as the raw material to control the content of impurity elements in the ingot. It is smelted three times in a vacuum consumable electric arc furnace to ensure uniform composition of the ingot, and is smelted into an ingot of Φ640mm×700mm. The weight percent of each composition of ingot is:
[0026] (2) Forging: Open billet forging at 1040°C. The ingot is changed from a round billet to a square billet, and then the square billet is forged with multiple fires. Forging at 1000°C for 1 fire, the upsetting and drawing deformations are 26% and 35% respectively. After forging at 950℃ for 3 times, the upsetting and drawing deformations are 26% and 96% respectively. Finally, it is drawn at 890°C to obtain a round billet of forged rod with Ф150mm×2750mm.
[0027] (3) Hot extrusion: the f...
Embodiment 2
[0033] (1) Smelting: Grade 1 high-quality titanium sponge is used as the raw material to control the content of impurity elements in the ingot, and it is smelted three times in a vacuum consumable electric arc furnace to ensure that the composition of the ingot is uniform. Smelted into an ingot of Φ640mm×700mm. The weight percent of each composition of ingot is:
[0035] (2) Forging: Open billet forging at 1060°C. The ingot is changed from a round billet to a square billet, and then the square billet is forged with multiple fires. Forging at 1000°C for 2 times, the upsetting and drawing deformations were 26% and 35% respectively. After forging at 950℃ for 4 times, the upsetting and drawing deformations are 26% and 96% respectively. Finally, it was drawn at 880°C to obtain a forged rod of Ф150mm×2750mm.
[0036] (3) Hot extrusion: the forg...
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Abstract
The invention provides a high-strength high-toughness titanium alloy tube. The titanium alloy tube comprises the following components in percentage by weight: 6.0-7.5% of Al, 1.5-2.5% of Mo, 0.5-1.0% of Sn, 2.5-4% of V, Fe of which the percentage by weight is smaller than 0.08%, Si of which the percentage by weight is smaller than 0.08%, C of which the percentage by weight is smaller than 0.05%, N of which the percentage by weight is smaller than 0.02%, H of which the percentage by weight is smaller than 0.005%, N of which the percentage by weight is smaller than 0.10%, and the balance being Ti. Besides, the invention further provides a production method of the high-strength high-toughness titanium alloy tube. The production method has the benefits that through the method, repeated firing and upsetting of large deformation is performed on blanks, so that the coarse casting tissue of a cast ingot is sufficiently crushed, and the tissue is evenly refined; the properties of the titanium alloy tube is improved by adopting hot treatment in cold rolling, and the like. The titanium alloy tube manufactured by the method is high in strength, and good in toughness, and has the characteristics that the yield strength is larger than 780Mpa; the impact toughness is larger than 23J (0DEG C, V opening, 10*5mm); the elongation percentage is larger than 15%.
Description
technical field [0001] The invention relates to a titanium alloy pipe and a production method thereof, in particular to a high-strength and high-toughness titanium alloy pipe and a production method thereof. Background technique [0002] Titanium alloy has a series of advantages such as high specific strength, high specific modulus, corrosion resistance, etc., but its low impact toughness hinders its application. For example, the typical properties of the commonly used Ti-6Al-4V are: tensile strength 900-1050MPa, yield strength 750-900MPa, impact toughness (0°C, V port, 10×5mm) only 15-20J, which can no longer meet the needs of development . High-strength and high-toughness titanium alloy tubes are one of the main directions for the development of titanium alloys. [0003] In addition, titanium alloy has the characteristics of high strength, difficult deformation, and extremely difficult processing and forming, which makes the development and processing technology of titan...
Claims
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