CN104550312A - Processing method of large seamless tantalum or tantalum alloy pipe - Google Patents
Processing method of large seamless tantalum or tantalum alloy pipe Download PDFInfo
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- CN104550312A CN104550312A CN201410755919.1A CN201410755919A CN104550312A CN 104550312 A CN104550312 A CN 104550312A CN 201410755919 A CN201410755919 A CN 201410755919A CN 104550312 A CN104550312 A CN 104550312A
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- tantalum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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Abstract
The invention relates to a processing method of a large seamless tantalum or tantalum alloy pipe. The processing method is characterized by comprising the following steps: I. digging out a hole in a tantalum or tantalum alloy ingot to obtain a hollow pipe billet; II. extruding the pipe billet, preheating the hollow pipe billet to 150-230 DEG C, heating by an intermediate frequency furnace and extruding to form the pipe billet with the diameter of pi90-pi130mm, wherein the thickness of the pipe wall is 10-25mm and the extruding temperature is 800-900 DEG C; and III. carrying out acid pickling on the pipe billet to remove the surface impurities. According to the processing method of the large seamless tantalum or tantalum alloy pipe, the processing method is mainly applied to the production of large-diameter thick-wall pipelines with the chemical anticorrosion outer diameter being more than or equal to pi60-90mm and the wall thickness being more than or equal to 3-6mm, an appropriate heat treatment process is matched, the required performances of products can be achieved and the utilization rate of a material is greatly increased.
Description
Technical field
The present invention relates to the processing method of a kind of large gauge tantalum or tantalum alloy seamless tubular goods.
Background technology
Pure tantalum and tantalum-tungsten alloy are the Rare Metals Materials of a kind of high density, high-melting-point, high strength, there is very high elevated temperature strength, good ductility, solderability and excellent decay resistance, be applicable to high temperature, high pressure, the working environment such as corrosion-resistant, very fast in the development that chemical anticorrosion is industrial in recent years, be a kind of very important engineering and functional material.Why tantalum and tantalum-tungsten alloy have outstanding resistance to corrosion, are because form the fine and close Ta of very thin, the impermeabilisation of one deck and protectiveness on the metal surface
2o
5oxide, this layer of protection can the corrosion of resistance to highly basic, HF, chloride and sulfuric acid, until 190 DEG C-250 DEG C, the structure of rete can change with the change of environment.The feature of Ta-2.5%W alloy not only increases material self-strength, and there is good corrosive power, industrial sulphuric acid with 96% and the nitrating wasting acid of recovery carry out the display of immersion test comparing result, and the corrosion resistance in sulfuric acid of Ta2.5W is better than the tantalum of non-alloying; When sulfuric acid concentration reaches more than 96%, to use Ta2.5W material.
Traditional tubing ingot casting preparation method directly obtains with bore mode, and drilling cuttings accounts for the ratio nearly 8%-15% of ingot casting, and stock utilization is low, and waste is serious.
Summary of the invention
The object of this invention is to provide the processing method of a kind of large gauge tantalum or tantalum alloy seamless tubular goods, the quality requirement of major-diameter thick-wall pipe material product can be met, and significantly improve stock utilization.
A processing method for large gauge tantalum or tantalum alloy seamless tubular goods, its special feature is, comprises the steps:
First step: tantalum or tantalum alloy ingot casting are drawn hole, obtains hollow bloom;
Second step: pipe extrudes, after being preheated to 150-230 DEG C by hollow bloom, then become the pipe of diameter at Φ 90-Φ 130mm with extruding after intermediate frequency heating, pipe thickness is at 10-25mm, and extrusion temperature is 800 DEG C-900 DEG C;
Third step: by the pipe pickling obtained, removes surface impurity;
4th step: the pipe obtained is heat-treated, heat treatment temperature is 35% ~ 50% of tantalum or tantalum alloy fusing point, and temperature retention time is 60 ~ 90min;
5th step: will the pipe boring endoporus obtained be extruded, turning, remove the defect inside and outside pipe;
6th step: rolling, life cycle formula double-roller cold pilger mill carries out the reduction of diameter and pipe thickness to tubing, thus tubing is reached meet the rolling dimensional requirement of multiple roll cold-rolling pilger mill;
7th step: intermediate heat-treatment, controlling heat treatment temperature is 1200 DEG C-1350 DEG C, and temperature retention time is 30-120min;
8th step: finished product rolling, uses multiple roll cold-rolling pilger mill the tubing obtained to be carried out to the reduction of diameter and pipe thickness, finally reaches the size of pipe and tubing of finished product;
9th step: to the sawing of finished product aligning;
Tenth step: finished product heat treatment, controls heat treatment temperature 1200 DEG C-1350 DEG C, temperature retention time 30 ~ 120min.
Drawing in first step that ingot casting center specifically to draw out with wire cutting machine tool by hole can the bar that utilizes of secondary and obtain hollow bloom.
First one deck glass dust is coated with at hollow bloom surface uniform after preheating in second step.
The pipe pickling will obtained in third step, removes surface impurity, until visually observe visible tantalum metallic luster and the assorted spot of nothing; Spent pickling acid liquid is according to volume basis HCl:HF:H
2o=5:2:3.
To the pipe boring endoporus obtained be extruded, turning in 5th step, remove the macroscopic defect affecting final finished pipe workpiece quality inside and outside pipe.
In 6th step rolling specifically life cycle formula double-roller cold pilger mill tubing is carried out to the reduction of diameter and pipe thickness, tubing is reached meet the dimensional requirement of multi-roll cold reducing mill, namely diameter is at Φ 60-Φ 90mm, pipe thickness at 4-10mm, controlled rolling speed 20-60 beat/min.
In 8th step, finished product rolling specifically uses multiple roll cold-rolling pilger mill to carry out the reduction of diameter and pipe thickness to the tubing obtained, finally reach size of pipe and tubing diameter at Φ 60-Φ 90mm, pipe thickness, at 3-6mm, controls normal mill speed≤40 beat/min.
In 9th step to the sawing of finished product aligning specifically by tubing by straightener, thus the linearity linearity of tubing being reached meet finished product and require, then sawing.
The invention provides a kind of processing method of large gauge seamless tubular goods, mainly be applicable to being applied to chemical anticorrosion external diameter >=φ 60-90mm, the production of wall thickness >=3-6mm major-diameter thick-wall tubing, and be equipped with suitable Technology for Heating Processing, the performance of product needed can be obtained, and substantially increase the utilization rate of material.
Detailed description of the invention
The present invention divides two schemes to implement: one is adopt Linear cut to go out ingot casting core rod base to obtain, and this part excellent base can be used as wire feedstock and carries out regenerative ratio; Two is first obtain a small diameter bore with Linear cut or bore mode (depending on extrusion ingot length), then obtains the pipe ingot of the internal diameter size that technique needs through extruding hot reaming, and these two kinds of methods all will improve stock utilization greatly.
Major advantage of the present invention is: to ingot casting boring, and the method for intermediate frequency Fast Heating and employing three-dimensional compressive stress extrusion blooming processes with employing two rollers and multiple roll cold-rolling pilger mill the seamless tubular goods meeting dimensional tolerance and performance requirement.
Embodiment 1:
First step: hole drawn by ingot casting, Φ 212mm × L → Φ 212mm × Φ 95mm × L ˊ.Use Linear cut ingot casting center is drawn out can secondary utilize bar, the hollow bloom of system.
Second step: pipe extrudes, after pipe preheating 200 DEG C, surface uniform glassing, intermediate frequency heating, extrusion temperature is 800 DEG C-950 DEG C (being incubated 5 minutes); Ensure the concentricity of pipe extrusion blooming.
Third step: pipe pickling, removes surface impurity, visually observes visible tantalum metallic luster without assorted spot; Spent pickling acid is, HCl (technical hydrochloric acid): HF (industrial hydrofluoric acid): H
2o=5:2:3 (volume ratio);
4th step: pipe heat treatment, heat treatment temperature is 1250 DEG C, and temperature retention time is 60min;
5th step: boring endoporus, turning, in lathe uses, internal surface of bloom extruded channels is removed by boring cutter; Outer surface removes extrusion defect, makes surface without the defect of influence of rolled.
6th step: rolling, with the determination rolling of two-roller mill to the correction of pipe evenness of wall thickness and pass reduction, double-roller cold pilger mill is used tubing to be carried out to the reduction of diameter and pipe thickness, tubing is reached meet the dimensional requirement of multi-roll cold reducing mill, namely diameter is at Φ 60 ~ Φ 90mm, pipe thickness is at 4 ~ 10mm, and mill speed 20-60 beat/min, pipe feed is 1-2mm/ time.
7th step: intermediate heat-treatment, heat treatment temperature is 1200 DEG C, and temperature retention time is 60min.
8th step: finished product rolling, the control of multi-roll mill to finished product tubing dimensional tolerance and the safeguard measure of surfaces externally and internally.Specifically use multiple roll cold-rolling pilger mill the tubing obtained to be carried out to the reduction of diameter and pipe thickness, finally reach size of pipe and tubing diameter at Φ 60-Φ 90mm, pipe thickness, at 3-6mm, controls normal mill speed≤40 beat/min.
9th step: the sawing of finished product aligning, makes the glacing flatness of finished product tubing reach the requirement of client or standard, then sawing.
Tenth step: finished product heat treatment, heat treatment temperature 1200 DEG C-1350 DEG C, temperature retention time 60min-90min.
Claims (8)
1. a processing method for large gauge tantalum or tantalum alloy seamless tubular goods, is characterized in that, comprises the steps:
First step: tantalum or tantalum alloy ingot casting are drawn hole, obtains hollow bloom;
Second step: pipe extrudes, after being preheated to 150-230 DEG C by hollow bloom, then become the pipe of diameter at Φ 90-Φ 130mm with extruding after intermediate frequency heating, pipe thickness is at 10-25mm, and extrusion temperature is 800 DEG C-900 DEG C;
Third step: by the pipe pickling obtained, removes surface impurity;
4th step: the pipe obtained is heat-treated, heat treatment temperature is 35% ~ 50% of tantalum or tantalum alloy fusing point, and temperature retention time is 60 ~ 90min;
5th step: will the pipe boring endoporus obtained be extruded, turning, remove the defect inside and outside pipe;
6th step: rolling, life cycle formula double-roller cold pilger mill carries out the reduction of diameter and pipe thickness to tubing, thus tubing is reached meet the rolling dimensional requirement of multiple roll cold-rolling pilger mill;
7th step: intermediate heat-treatment, controlling heat treatment temperature is 1200 DEG C-1350 DEG C, and temperature retention time is 30-120min;
8th step: finished product rolling, uses multiple roll cold-rolling pilger mill the tubing obtained to be carried out to the reduction of diameter and pipe thickness, finally reaches the size of pipe and tubing of finished product;
9th step: to the sawing of finished product aligning;
Tenth step: finished product heat treatment, controls heat treatment temperature 1200 DEG C-1350 DEG C, temperature retention time 30 ~ 120min.
2. the processing method of large gauge tantalum as claimed in claim 1 or tantalum alloy seamless tubular goods, is characterized in that: drawing in first step that ingot casting center specifically to draw out with wire cutting machine tool by hole can the bar that utilizes of secondary and obtain hollow bloom.
3. the processing method of large gauge tantalum as claimed in claim 1 or tantalum alloy seamless tubular goods, is characterized in that: be first coated with one deck glass dust at hollow bloom surface uniform after preheating in second step.
4. the processing method of large gauge tantalum as claimed in claim 1 or tantalum alloy seamless tubular goods, is characterized in that: the pipe pickling will obtained in third step, removes surface impurity, until visually observe visible tantalum metallic luster and the assorted spot of nothing; Spent pickling acid liquid is according to volume basis HCl:HF:H
2o=5:2:3.
5. the processing method of large gauge tantalum as claimed in claim 1 or tantalum alloy seamless tubular goods, is characterized in that: will extrude the pipe boring endoporus obtained, turning in the 5th step, remove the macroscopic defect affecting final finished pipe workpiece quality inside and outside pipe.
6. the processing method of large gauge tantalum as claimed in claim 1 or tantalum alloy seamless tubular goods, it is characterized in that: in the 6th step rolling specifically life cycle formula double-roller cold pilger mill tubing is carried out to the reduction of diameter and pipe thickness, tubing is reached meet the dimensional requirement of multi-roll cold reducing mill, namely diameter is at Φ 60-Φ 90mm, pipe thickness at 4-10mm, controlled rolling speed 20-60 beat/min.
7. the processing method of large gauge tantalum as claimed in claim 1 or tantalum alloy seamless tubular goods, it is characterized in that: in the 8th step, finished product rolling specifically uses multiple roll cold-rolling pilger mill to carry out the reduction of diameter and pipe thickness to the tubing obtained, finally reach size of pipe and tubing diameter at Φ 60-Φ 90mm, pipe thickness, at 3-6mm, controls normal mill speed≤40 beat/min.
8. the processing method of large gauge tantalum as claimed in claim 1 or tantalum alloy seamless tubular goods, it is characterized in that: in the 9th step, specifically by tubing, straightener is passed through to the sawing of finished product aligning, thus the linearity linearity of tubing being reached meet finished product and require, then sawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410755919.1A CN104550312A (en) | 2014-12-10 | 2014-12-10 | Processing method of large seamless tantalum or tantalum alloy pipe |
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| CN201410755919.1A CN104550312A (en) | 2014-12-10 | 2014-12-10 | Processing method of large seamless tantalum or tantalum alloy pipe |
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| CN104550312A true CN104550312A (en) | 2015-04-29 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111014337A (en) * | 2019-12-01 | 2020-04-17 | 重庆金世利航空材料有限公司 | Preparation method of non-porous extruded titanium alloy pipe |
| CN111203453A (en) * | 2020-01-13 | 2020-05-29 | 成都先进金属材料产业技术研究院有限公司 | Method for producing small-caliber TA18 titanium alloy seamless tube |
| CN111744984A (en) * | 2020-06-18 | 2020-10-09 | 宁夏东方钽业股份有限公司 | Preparation method of tantalum alloy and niobium alloy tube blank |
| CN112322951A (en) * | 2020-08-18 | 2021-02-05 | 长沙南方钽铌有限责任公司 | Tantalum alloy, tantalum alloy seamless tube preparation method and tantalum alloy seamless tube |
| CN112342446A (en) * | 2020-08-18 | 2021-02-09 | 长沙南方钽铌有限责任公司 | Tantalum alloy, tantalum alloy seamless tube preparation method and tantalum alloy seamless tube |
| CN112359256A (en) * | 2020-08-18 | 2021-02-12 | 长沙南方钽铌有限责任公司 | Tantalum alloy, tantalum alloy seamless tube preparation method and tantalum alloy seamless tube |
| CN112453102A (en) * | 2020-11-23 | 2021-03-09 | 河北鑫泰重工有限公司 | Production and manufacturing process of high-temperature-resistant nickel-based alloy pipe fitting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111014337A (en) * | 2019-12-01 | 2020-04-17 | 重庆金世利航空材料有限公司 | Preparation method of non-porous extruded titanium alloy pipe |
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| CN112359256A (en) * | 2020-08-18 | 2021-02-12 | 长沙南方钽铌有限责任公司 | Tantalum alloy, tantalum alloy seamless tube preparation method and tantalum alloy seamless tube |
| CN112453102A (en) * | 2020-11-23 | 2021-03-09 | 河北鑫泰重工有限公司 | Production and manufacturing process of high-temperature-resistant nickel-based alloy pipe fitting |
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