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A machining method for a metastable beta type titanium alloy TB16 cold rolled tube

A technology of β-titanium alloy and processing method, which is applied in the field of metastable β-titanium alloy TB16 cold-rolled pipe processing, can solve the problems of increased fuel and operating costs, low yield, excessive ellipticity, etc., and achieves easy control of dimensional accuracy, Improved productivity and good welding performance

Active Publication Date: 2018-06-15
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the field of equipment that requires relatively high working pressure, these alloys will not be able to meet the requirements of use, and steel pipes have a large product weight for aviation, aerospace, deep-sea drilling and petrochemical industries, which in turn leads to increased fuel and operating costs and corrosion resistance. Therefore, the development of high-strength and high-toughness titanium alloy pipe preparation technology can effectively make up for these shortcomings
For high-strength titanium alloy tubes, it is currently reported that some units use the spinning method to prepare them. Due to the low elastic modulus of titanium alloys, the tube wall does not stick to the mold during the spinning process, resulting in poor dimensional accuracy such as excessive ovality. Problem, it is also reported that some units use hot perforation or hot extrusion to prepare thick-walled pipes, and then prepare thin-walled pipes by machining. This method not only causes material waste, but also has low yield and is not suitable for large-scale production. The key is this Machined thin-walled pipes are under high stress conditions, and the surface turning tool marks have a greater potential risk to the stressed parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of finished tube Φ89 (outer diameter)×Φ85 (inner diameter)×Lmm. The preparation process is as follows:

[0052]One, according to the following proportions, wherein, Ti5Mo5V6Cr3Al ingredients: Mo: 4.9wt%; V: 5.1wt%; Cr: 5.9wt%; Al: 3.0wt%; Fe: 0.09wt%; C: 0.006wt%; 0.008wt%; H: 0.0011wt%; O: 0.08wt%; the balance is titanium; using MoAl (Mo content 72%), VAl (V content 81%) master alloy, pure Cr and Al foil, according to the proportion of ingredients , mixed evenly with titanium sponge, and pressed into an electrode.

[0053] 2. Obtain a Φ600mm ingot after three times of melting in a vacuum consumable electric furnace;

[0054] 3. Open blank forging at 1200℃ to obtain 400×400×Lmm square billet;

[0055] 4. After the square billet 400×400×Lmm is ground and blanked, it is heated at 1100°C and forged to obtain a Φ300×Lmm bar;

[0056] 5. After grinding and cutting the bar material Φ300×Lmm, after heating at 950°C for 2 hours, extrude Φ122 (outer diameter)×Φ10...

Embodiment 2

[0069] Preparation of finished tube Φ72 (outer diameter)×Φ67 (inner diameter)×Lmm. The preparation process is as follows:

[0070] One, according to the following proportions, wherein, Ti5Mo5V6Cr3Al ingredients: Mo: 4.9wt%; V: 5.1wt%; Cr: 5.9wt%; Al: 3.0wt%; Fe: 0.09wt%; C: 0.006wt%; 0.008wt%; H: 0.0011wt%; O: 0.08wt%; the balance is titanium; using MoAl (Mo content 72%), VAl (V content 81%) master alloy, pure Cr and Al foil, according to the proportion of ingredients , mixed evenly with titanium sponge, and pressed into an electrode.

[0071] 2. Obtain Φ500mm ingots after three times of smelting in a vacuum consumable electric furnace;

[0072] 3. Open blank forging at 1200℃ to obtain 350×350×Lmm square billet;

[0073] 4. After the square billet 350×350×Lmm is ground and blanked, it is heated at 1100°C and forged to obtain a Φ250×Lmm bar;

[0074] 5. After grinding and cutting the bar material Φ250×Lmm, after heating at 950°C for 2 hours, extrude Φ99 (outer diameter)×Φ79...

Embodiment 3

[0087] Embodiment 3 welding performance test

[0088] Welding sample preparation of finished pipe Φ72 (outer diameter)×Φ67 (inner diameter)×Lmm. The preparation process is as follows:

[0089] One, according to the following ratio of ingredients, wherein, Ti5Mo5V6Cr3Al ingredients: Mo: 4.9wt%; V: 5.1wt%; Cr: 5.9wt%; Al: 3.0wt%; Fe: 0.09wt%; C: 0.006wt%; 0.008wt%; H: 0.0011wt%; O: 0.08wt%; the balance is titanium; using MoAl (Mo content 72%), VAl (V content 81%) master alloy, pure Cr and Al foil, according to the proportion of ingredients , mixed evenly with titanium sponge, and pressed into an electrode.

[0090] 2. Obtain Φ500mm ingots after three times of smelting in a vacuum consumable electric furnace;

[0091] 3. Open blank forging at 1200℃ to obtain 350×350×Lmm square billet;

[0092] 4. After the square billet 350×350×Lmm is ground and blanked, it is heated at 1100°C and forged to obtain a Φ250×Lmm bar;

[0093] 5. After grinding and cutting the bar material Φ250×L...

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Abstract

The invention relates to a machining method for a metastable beta type titanium alloy TB16 cold rolled tube. The method includes blending raw materials of a TB16 titanium alloy, preparing a cast ingot, performing blooming forging, extruding a tube, performing sand blasting, performing acid washing, subjecting the tube to multi-pass rolling, subjecting a tube finished product to solution treatmentand ageing treatment, and other steps. Raw materials of the TB16 titanium alloy comprise 4.5-5.7 wt% of Mo, 4.5-5.7 wt% of V, 5.5-6.5 wt% of Cr, 2.5-3.5 wt% of Al, less than 0.30 wt% of Fe, less than0.05 wt% of C, less than 0.04 wt% of N, less than 0.015 wt% of H and less than 0.15 wt% of O, with the balance being titanium. The alloy has high tensile strength, toughness and good welding performance, and can be used in the fields of aviation, aerospace, oil, ships, chemical engineering, and the like.

Description

technical field [0001] The invention relates to a processing method for a metastable beta titanium alloy TB16 cold-rolled pipe, in particular to a processing method for a high-strength titanium alloy cold-rolled pipe whose general formula is TB16. Background technique [0002] At present, titanium and titanium alloy pipes mainly use low-strength or medium-strength titanium and titanium alloys such as TA2, TA9, TA18 and TC4. Based on the limitations of their own strength, the working pressure they can withstand is generally not high. For the field of equipment that requires relatively high working pressure, these alloys will not be able to meet the requirements of use, and steel pipes have a large product weight for aviation, aerospace, deep-sea drilling and petrochemical industries, which in turn leads to increased fuel and operating costs and corrosion resistance. Therefore, the development of high-strength and high-toughness titanium alloy pipe preparation technology can e...

Claims

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Application Information

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IPC IPC(8): B21C37/06C22C14/00C22F1/18
Inventor 魏衍广陶海明罗峥崔雪飞
Owner GRIMAT ENG INST CO LTD
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