CN103898355B

CN103898355B - Ti-5Mo-5V-6Cr-3Al titanium alloy extruded tube and working method thereof

Info

Publication number: CN103898355B
Application number: CN201210568280.7A
Authority: CN
Inventors: 魏衍广; 陶海明; 崔雪飞; 罗峥; 陈海珊
Original assignee: Beijing General Research Institute for Non Ferrous Metals
Current assignee: GRIMN Engineering Technology Research Institute Co Ltd
Priority date: 2012-12-24
Filing date: 2012-12-24
Publication date: 2016-02-24
Anticipated expiration: 2032-12-24
Also published as: CN103898355A

Abstract

The present invention relates to titanium alloy extruded tube and the working method thereof of a kind of Ti-5Mo-5V-6Cr-3Al.This titanium alloy extruded tube, the weight percent content of main alloy element is: Mo4.5% ~ 5.7%, V4.5% ~ 5.7%, Cr5.5% ~ 6.5%, Al2.5% ~ 3.5%, and surplus is titanium.Tubing is prepared on large-tonnage extrusion machine, because it has higher tensile strength, toughness and good welding property, can be widely used in the fields such as Aeronautics and Astronautics, oil, chemical industry.

Description

Ti-5Mo-5V-6Cr-3Al titanium alloy extruded tube and working method thereof

Technical field

The present invention relates to titanium alloy extruded tube and the working method thereof of a kind of Ti-5Mo-5V-6Cr-3Al, belong to novel metastableβtitaniumalloy field.

Background technology

At present, titanium alloy tube mainly adopts the low strength titanium alloy materials such as TA1, TA2, TA9, TA10, Ti-3Al-2V, based on the limitation of itself intensity, is generally used for chemical industry or the lower equipment of other operating pressure.And the apparatus field that operating pressure is larger, as equipment such as aerospace or part petrochemical compleies, adopt high strength steel pipe more.The quality of high-strength steel is large, corrosion resisting property is not good, reduces the supporting capacity on aircraft or naval vessel, therefore, is necessary the preparation technology developing high-strength high-ductility titanium alloy extruded tube.Ti-5Mo-5V-6Cr-3Al titanium alloy extruded tube complete processing is exactly develop under this background.

Summary of the invention

The object of this invention is to provide titanium alloy extruded tube and production technique thereof that a kind of general formula is Ti-5Mo-5V-6Cr-3Al, it has, and technical process be simple, processing ease, stable performance and can the features such as product be criticized.

General formula is a titanium alloy extruded tube of Ti-5Mo-5V-6Cr-3Al, and the weight percent content (wt%) of its main alloy element is: Mo4.5% ~ 5.7%, V4.5% ~ 5.7%, Cr5.5% ~ 6.5%, Al2.5% ~ 3.5%, and surplus is titanium.

Also containing Fe, C, N, H and O element in described titanium alloy extruded tube, its weight percent is: Fe<0.30%, C<0.05%, N<0.04%, H<0.015% and O<0.15%.

General formula is a working method for the titanium alloy extruded tube of Ti-5Mo-5V-6Cr-3Al, comprises the steps:

(1) by following weight percent batching (wt%): Mo4.5% ~ 5.7%, V4.5% ~ 5.7%, Cr5.5 ~ 6.5%, Al2.5 ~ 3.5%, surplus is titanium;

(2) batching is pressed into electrode, in vacuum consumable electric furnace, is smelted into ingot casting through 3 times;

(3) ingot casting is 1000 ~ 1200 DEG C of forgings, obtains bar;

(4) excellent base blanking, adopts oil press punching, adopts red copper jacket to the pipe obtained;

(5) pipe is 900 ~ 1150 DEG C of extruding, obtains the tubing of 4 ~ 15mm wall thickness;

(6) 450 ~ 650 DEG C of insulations 1 ~ 8 hour, ageing treatment is carried out;

(7) Performance Detection and pressure test, after qualified, obtains finished product.

In step (1), also can comprise in batching: Fe<0.30%, C<0.05%, N<0.04%, H<0.015%, O<0.15%.

In step (2), batching is pressed into electrode on 2000 tons of oil presses, in vacuum consumable electric furnace, is smelted into ingot casting through 3 times; The diameter of ingot casting is Φ 550 ~ 400mm.

In step (3), ingot casting was 1000 ~ 1200 DEG C of heating 1 ~ 3 hour, and the diameter of forging bar is Φ 400 ~ 300mm.

In step (4), 2000 tons of oil press punchings after excellent base blanking, red copper jacket is all adopted to the surfaces externally and internally of pipe Φ 400 ~ 300mm (external diameter) × Φ 50 ~ 110mm (internal diameter) × Lmm.

In step (5), pipe, 900 ~ 1150 DEG C of heating 0.5 ~ 2 hour, 5000 tons of extrusion machines obtains Φ 80 ~ 120mm (external diameter) × 4 ~ 15mm (wall thickness) × Lmm tubing.

Ti-5Mo-5V-6Cr-3Al titanium alloy extruded tube prepared in accordance with the present invention, compared with titanium alloy tube performance existing on market, titanium alloy tube prepared by the present invention has obviously advantage in intensity, and welding coefficient reaches more than 0.9.

High-strength titanium alloy extruded tube of the present invention is prepared on large-tonnage extrusion machine, because it has higher tensile strength, toughness and good welding property, can be widely used in the fields such as Aeronautics and Astronautics, oil, chemical industry.

Embodiment

Illustrate the present invention below in conjunction with embodiment, but the present invention is not limited to this embodiment.

Embodiment 1

In following ratio gold conjugate material, main alloy element content (wt%) is: Mo4.8, V4.9, Cr6.0, Al3.1, Fe0.11, C0.008, N0.010, H0.0015, O0.10, and surplus is titanium.Batching is pressed into electrode on 2000 tons of oil presses, obtains ingot casting at vacuum consumable electric furnace through three meltings, about about 2000 DEG C of the temperature of vacuum consumable electric furnace, the diameter of ingot casting is Φ 510mm.Ingot casting was 1150 DEG C of heating 2 hours, be forged into Φ 350mm bar, after the blanking of rod base, 2000 tons of oil press punchings, obtain pipe Φ 350 × Φ 85 × 500mm, then red copper jacket is adopted to pipe surfaces externally and internally, after 1100 DEG C of heating, 5000 tons of extrusion machines obtain Φ 99 × Φ 85 × Lmm tubing, 600 DEG C of timeliness 2 hours, obtains sample 1.

Repeat above-mentioned identical step, obtain TA1, TA2, TA9, TA10 and Ti-3Al-2V(composition respectively as shown in table 1) etc. the extruded tube of same size of 5 trades mark, prepare comparative sample 1 ~ 5.

Sample 1 and comparative sample 1 ~ 5 are processed into the conventional tension specimen of Φ 5mm.Test completes on AG50KNE trier.The mechanical property of titanium alloy is as shown in table 2.Result shows, by extruded tube prepared by technique of the present invention, i.e. sample 1, compares with comparative sample 1 ~ 5, find that Ti-5Mo-5V-6Cr-3Al high-strength titanium alloy extruded tube prepared by the present invention has obviously strength advantage, the relative reduction in area of tubing is higher.

The composition of table 1 comparative sample 1 ~ 5 alloy

The mechanical property of table 2 sample 1 and comparative sample 1 ~ 5

Ti-5Mo-5V-6Cr-3Al and TA1, TA2, TA9, TA10 and Ti-3Al-2V tubing Linear cut are cut off, adopts beam-plasma welding to be welded by the tubing of cut-out, 600 DEG C of insulations 2 hours, obtain sample 2 and comparative sample 6 ~ 10.

Sample 2 and comparative sample 6 ~ 10 are processed into the conventional tension specimen of Φ 5mm, test and complete on AG50KNE trier, mechanical property is as shown in table 3.Result shows, after welding, tensile strength after the welding of Ti-5Mo-5V-6Cr-3Al alloy reduces 80MPa, plasticity does not change substantially, according to the definition (welding coefficient is determined by with the ratio of weld seam sample with the mechanical property not with weld seam sample) of welding coefficient, the welding coefficient can determining this alloy is 0.93, shows that this material is suitable as welding structural element.Compare with comparative sample 6 ~ 10, the mechanical property after the welding of Ti-5Mo-5V-6Cr-3Al alloy still has higher advantage, is conducive to the structure material required for high strength.

The mechanical property of table 3 sample 2 and comparative sample 6 ~ 10

Embodiment 2

In following ratio gold conjugate material, main alloy element content (wt%) is: Mo4.5, V5.7, Cr5.5, Al3.5, Fe0.08, C0.005, N0.007, H0.0008, O0.06, and surplus is titanium.Batching is pressed into electrode on 2000 tons of oil presses, obtains ingot casting at vacuum consumable electric furnace through three meltings, the diameter of ingot casting is Φ 400mm.Ingot casting was 1050 DEG C of heating 2 hours, be forged into Φ 300mm bar, after the blanking of rod base, 2000 tons of oil press punchings, obtain pipe Φ 300 × Φ 72 × 500mm, then red copper jacket is adopted to pipe surfaces externally and internally, after 950 DEG C of heating, 5000 tons of extrusion machines obtain Φ 80 × Φ 72 × Lmm tubing, 480 DEG C of timeliness 8 hours, obtains sample 4.Φ 80 × Φ 72 × Lmm tubing is cut off, then adopts electron beam to weld, obtain sample 5.Sample 4 and sample 5 are processed into the unconventional tension specimen of Φ 3mm, and test and complete on AG50KNE trier, mechanical property is as shown in table 4.

The mechanical property of table 4 sample 4 and 5

Mechanical property	Sample 4	Sample 5
			Tensile strength sigma _b/MPa	1380	1270
Yield strength σ _0.2/MPa	1350	1220
			Elongation after fracture δ ₅/%	14.0	15.0
Relative reduction in area Ψ/%	59.0	61.0

Embodiment 3

In following ratio gold conjugate material, main alloy element content (wt%) is: Mo5.7, V4.5, Cr6.5, Al2.5, Fe0.11, C0.015, N0.016, H0.003, O0.12, and surplus is titanium.Batching is pressed into electrode on 2000 tons of oil presses, obtains ingot casting at vacuum consumable electric furnace through three meltings, the diameter of ingot casting is Φ 550mm.Ingot casting was 1200 DEG C of heating 2 hours, be forged into Φ 380mm bar, after the blanking of rod base, 2000 tons of oil press punchings, obtain pipe Φ 380 × Φ 90 × 500mm, then red copper jacket is adopted to pipe surfaces externally and internally, after 1150 DEG C of heating, 5000 tons of extrusion machines obtain Φ 120 × Φ 90 × Lmm tubing, 650 DEG C of timeliness 1 hour, obtains sample 6.Φ 120 × Φ 90 × Lmm tubing is cut off, then adopts electron beam to weld, obtain sample 7.Sample 6 and sample 7 are processed into the conventional tension specimen of Φ 5mm, and test and complete on AG50KNE trier, mechanical property is as shown in table 5.

The mechanical property of table 5 sample 6 and 7

Mechanical property	Sample 6	Sample 7
			Tensile strength sigma _b/MPa	1250	1170
Yield strength σ _0.2/MPa	1200	1110
			Elongation after fracture δ ₅/%	10.0	12.0
Relative reduction in area Ψ/%	42.0	38.0

By above embodiment, the performance of titanium alloy pipe of the present invention can be seen: tensile strength sigma _b>=1200MPa, yield strength σ _0.2>=1100MPa, δ ₅>=10%, Ψ>=40%, has higher tensile strength, toughness; Pipe performance after welding: tensile strength sigma _b>=1150MPa, yield strength σ _0.2>=1050MPa, δ ₅>=10%, Ψ>=30%, has good welding property.Therefore, the Ti-5Mo-5V-6Cr-3Al high-strength titanium alloy extruded tube that prepared by the present invention is suitable for the structured material of high-strength and high ductility and welding requirements.

Claims

1. a working method for Ti5Mo5V6Cr3Al titanium alloy extruded tube, comprises the steps:

(1) prepare burden by following weight percent: Mo:4.5% ~ 5.7%, V:4.5% ~ 5.7%, Cr:5.5 ~ 6.5%, Al:2.5 ~ 3.5%, surplus is titanium;

(2) batching is pressed into electrode, in vacuum consumable electric furnace, is smelted into ingot casting through 3 times, the diameter of described ingot casting is Φ 550 ~ 400mm;

(3) ingot casting is 1000 ~ 1200 DEG C of forgings, obtains bar, and the diameter of described bar is 400 ~ 300mm;

(4) excellent base blanking, adopt oil press punching, all adopt red copper jacket to the surfaces externally and internally of the pipe obtained, the internal diameter of described pipe is 50 ~ 110mm;

(5) pipe was 900 ~ 1150 DEG C of heating 0.5 ~ 2 hour, and 5000 tons of extrusion machines extrude, obtains the tubing of 4 ~ 15mm wall thickness, the external diameter of described tubing is 80 ~ 120mm;

(6) 450 ~ 650 DEG C of insulations 1 ~ 8 hour, ageing treatment is carried out;

2. the working method of Ti5Mo5V6Cr3Al titanium alloy extruded tube according to claim 1, it is characterized in that: also comprise in batching: Fe<0.30%, C<0.05%, N<0.04%, H<0.015%, O<0.15%.