CN101708511B - Method for manufacturing pure titanium seamless tubes - Google Patents
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- CN101708511B CN101708511B CN2007100507707A CN200710050770A CN101708511B CN 101708511 B CN101708511 B CN 101708511B CN 2007100507707 A CN2007100507707 A CN 2007100507707A CN 200710050770 A CN200710050770 A CN 200710050770A CN 101708511 B CN101708511 B CN 101708511B
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Abstract
The invention relates to a method for manufacturing pure titanium seamless tubes. The method is characterized by comprising the following steps of: preparing tube blank bars; machining the tube blank bars; diagonally rolling and punching holes: heating blank to 700 to 980 DEG C, punching holes once or twice by utilizing a two-roll diagonally rolling mill group, wherein molybdenum mandrels or water-cooled mandrels are utilized, the inclined angle of punching roll is 8 degrees, the number of revolutions of the roll is 40 to 90 basic speed to 195 r/min; preparing the pierced billet after punching hole, wherein the specifications of the pierced billet are that the outside diameter is phi 72 to phi 125mm,the wall thickness is 5 to 20mm, and the length is; carrying out cold rolling; and carrying out heat treatment on finished product, detecting performance and entering warehouse. The invention has the characteristics of high production efficiency, low production cost, high material yield, short production period, low device investment, better product quality, and the like. The produced pure titanium seamless tubes have good quality, the mechanical properties accord with state requirements, and the pure titanium seamless tubes can meet the need for large-scale industrial production.
Description
Technical field
The invention belongs to the manufacturing of titanium tubing, relate to a kind of manufacture method of pure titanium seamless tubes.Mainly be applicable to roll piercing+cold rolling production pure titanium seamless tubes material.
Background technology
Titanium or titanium alloy is emerging 26S Proteasome Structure and Function material, has that proportion strength ratio height, thermal coefficient of expansion are little, a plurality of advantages such as good corrosion resistance, high-temperature behavior, low-temperature flexibility and low-temperature superconducting function admirable.In recent years, be used widely at civil areas such as Aero-Space, war industry and chemical industry, oil, ocean, physical culture, and be called as on " the 3rd metal " after iron, aluminium, " space metal ", " marine metal " are otherwise known as.
Along with Chinese economic development, the pure titanium seamless tubes material that proportion is little, corrosion resistance is good is also used in fields such as oil, chemical industry in succession, and therefore the demand to the pure titanium seamless tubes material increases the main dependence on import of pure titanium seamless tubes material of domestic use in recent years year by year.In the prior art, the method of making pure titanium pipe mainly is to adopt extruding+cold-rolling practice, this method technology is grasped easily, but the technological process of extrusion is more, it is long particularly to produce the ingot blank production process, excellent base is wanted peeling and bored big, the general extrusion bar rate of centre pilot hole, loss is 75% only, and production efficiency is low, the cost height, investment is big, metal and tool and mould consumption are bigger, is difficult to satisfy the large-scale industrial production needs.
Summary of the invention
Purpose of the present invention is intended to overcome above-mentioned deficiency of the prior art, a kind of with short production cycle, production efficiency and lumber recovery height is provided, can reduces production costs, can satisfy the manufacture method of the pure titanium seamless tubes of large-scale industrial production needs significantly.
The technological process of manufacture method of the present invention is mainly: roll (forging) rod → sawing → centering → car light → heating → roll piercing → reconditioning → cold rolling → degreasing → annealing → pickling → aligning → cold rolling (being circulated to finished product) → finished product heat treatment → pickling → aligning → flaw detection → cleaning → check → warehouse-in.
Content of the present invention is: a kind of manufacture method of pure titanium seamless tubes is characterized in that comprising the following steps:
A, preparation tube blank bar material: it is finished product titanium ingot that titanium sponge is smelted through vacuum consumable electrode arc furnace, becomes tube blank bar material through forging (rolling) again, and the diameter of tube blank bar material is φ 50～φ 130mm;
B, tube blank bar material machined: it is the blank of 650～4500mm that tube blank bar material sawing (adopting abrasive machine etc.) is become length; With horizontal centring machine centering, its internal point scope is at φ 18 ± 0.5～φ 30 ± 0.5mm then; And then with peeling locomotive light blank surface defective;
C, roll piercing: with blank heating to 700～980 ℃, carry out 1～2 perforation with the two-roll oblique rolling mill group, use molybdenum plug or water-cooled top, perforation roll inclination angle is that 8 °, roll revolution are 40～90 basic speed～195r/min, promptly make hollow forging after the perforation, hollow forging specification external diameter is that φ 72～φ 125mm, wall thickness are that 5～20mm, length are 1500～6000mm;
D, cold rolling: the waste tube outer surface that makes after the roll piercing is carried out reconditioning, adopt two cold mill groups, multiple rollers cold calender group, KPW25 milling train, SWK75 milling train or HPT160 mill milling (promptly cold rolling) then, whenever finish once rolling after again through degreasing, annealing, pickling, straightening processing, circulate rolling like this and handle after promptly make finished product; Circulate rolling and handle in the semi-finished product annealing temperature: 750～850 ℃+air cooling, time 20～100min;
E, finished product heat treatment and service check, warehouse-in: with finished product heat treatment, the annealing temperature that makes: 700～800 ℃+air cooling, time 20～100min; Again by specification requirement detect a flaw, service check, warehouse-in; Trimmed size is external diameter φ 10.0～φ 89.0 * wall thickness 1.0～16.0mm.
In the content of the present invention: the described two cold mill groups of step (d) can be LG80, LG55 or LG30 two cold mill groups.
In the content of the present invention: the described multiple rollers cold calender group of step (d) can be LD60, LD30 or LD15 multiple rollers cold calender group.
In the content of the present invention:: the described titanium sponge of step (a) is with one-level or secondary titanium sponge.
Compared with prior art, the present invention has following characteristics:
(1) technological process is simpler, and the production cycle, whole efficiency wanted high by 30% than extrusion;
(2) to have only peeling loss, the lumber recovery of perforation be 90% for blank processing, the lumber recovery height; Production process is less, the production efficiency height; Can reduce production costs significantly;
(3) production equipment and lumber recovery satisfy the condition that industrial scale is produced pure titanium pipe, can satisfy the needs of large-scale industrial production, good quality of product, pure titanium pipe surface quality is good, every mechanical performance index all meets GB/T3624-95 or GB/T3625-95 requirement, satisfy technical standard fully, practical;
(4) adopt the pure titanium seamless tubes of manufacturing of the present invention can reach following index:
1. hollow forging and finished product mechanical properties of tubular goods
φ 76 * 5mm is taken a sample its mechanical property such as table 1 after goods and the heat treatment of φ 25 * 1.5mm production tube.As shown in Table 1, the mechanical property of hollow forging and finished product tubing all meets the requirement of GB/T3624-1995.
Table 1: hollow forging and finished product mechanical properties of tubular goods
| Specification | σb(MPa) | σr0.2(MPa) | δ5(％) |
| GB/T3624-1995 | 280～420 | ≥250 | ≥20 |
| Φ 76 * 5 (air cooling) | 365 | --- | 39 |
| Φ 76 * 5 (water-cooled) | 385 | --- | 35 |
| Φ25×1.5 | 420 | 290 | 36.5 |
| 410 | 265 | 40 |
2. flaring test
φ 25 * 1.5mm production tube is pressed the GB/T3624-1995 check, and is qualified.
3. flattening test
φ 25 * 1.5mm production tube is pressed the GB/T3624-1995 check, and is qualified.
4. flaw detection
φ 25 * 1.5mm production tube is by the GB/T3624-1995 requirement, and is qualified.
5. tissue and clarity check
The clarity photograph of the pure titanium pipe of φ 25 * 1.5mm finished product is seen accompanying drawing 1;
The metallographic structure photograph of the pure titanium pipe of φ 25 * 1.5mm finished product is seen accompanying drawing 2.
Can find out that from accompanying drawing 1 the pure titanium pipe of φ 25 * 1.5mm finished product is not seen obviously and is mingled with; Find out from Fig. 2 is attached, finished product tubing even tissue, and crystal grain is equiax crystal.
Description of drawings
Fig. 1 is an embodiment of the invention clarity photograph;
Fig. 2, Fig. 3 embodiment of the invention metallographic structure photograph.
The specific embodiment
Below by embodiment the present invention is further described:
The technological process of embodiment of the invention manufacture method is mainly: roll (forging) rod → sawing → centering → car light → heating → roll piercing → reconditioning → cold rolling → degreasing → annealing → pickling → aligning → cold rolling (being circulated to finished product) → finished product heat treatment → pickling → aligning → flaw detection → cleaning → check → warehouse-in.
Embodiment 1:
A kind of manufacture method of pure titanium seamless tubes comprises the following steps:
A, preparation tube blank bar material: it is finished product titanium ingot that titanium sponge (with one-level or secondary titanium sponge) is smelted through vacuum consumable electrode arc furnace, becomes tube blank bar material through forging (rolling) again, and the diameter of tube blank bar material is φ 50～φ 130mm;
B, tube blank bar material machined: it is the blank of 650～4500mm that tube blank bar material sawing (adopting abrasive machine etc.) is become length; With horizontal centring machine centering, its internal point scope is at φ 18 ± 0.5～φ 30 ± 0.5mm then; And then with peeling locomotive light blank surface defective;
C, roll piercing: with blank heating to 700～980 ℃, carry out 1～2 perforation with the two-roll oblique rolling mill group, use molybdenum plug or water-cooled top, perforation roll inclination angle is that 8 °, roll revolution are 40～90 basic speed～195r/min, promptly make hollow forging after the perforation, hollow forging specification external diameter is that φ 72～φ 125mm, wall thickness are that 5～20mm, length are 1500～6000mm;
D, cold rolling: the waste tube outer surface that makes after the roll piercing is carried out reconditioning, adopt two cold mill groups, multiple rollers cold calender group, KPW25 milling train, SWK75 milling train or HPT160 mill milling (promptly cold rolling) then, whenever finish once rolling after again through degreasing, annealing, pickling, straightening processing, circulate rolling like this and handle after promptly make finished product; Circulate rolling and handle in the semi-finished product annealing temperature: 750～850 ℃+air cooling, time 20～100min;
E, finished product heat treatment and service check, warehouse-in: with finished product heat treatment, the annealing temperature that makes: 700～800 ℃+air cooling, time 20～100min; Again by specification requirement detect a flaw, service check, warehouse-in; Trimmed size is external diameter φ 10.0～φ 89.0 * wall thickness 1.0～16.0mm.
The described two cold mill groups of step (d) are LG80, LG55 or LG30 two cold mill groups.
The described multiple rollers cold calender group of step (d) is LD60, LD30 or LD15 multiple rollers cold calender group.
The present invention has the production efficiency height, production cost is low, lumber recovery is high, with short production cycle, the equipment investment expense is low, good, the every mechanical performance index of the pipe surface quality of producing all meets advantages such as national standard.
Embodiment 2:
A kind of manufacture method of pure titanium seamless tubes comprises the following steps:
A, preparation tube blank bar material: it is finished product titanium ingot that titanium sponge (with one-level or secondary titanium sponge) is smelted through vacuum consumable electrode arc furnace, becomes tube blank bar material through forging (rolling) again, and the diameter of tube blank bar material is φ 90mm;
B, tube blank bar material machined: it is the blank of 650～4500mm that tube blank bar material sawing (adopting abrasive machine etc.) is become length; With horizontal centring machine centering, its internal point scope is at φ 18 ± 0.5～φ 30 ± 0.5mm then; And then with peeling locomotive light blank surface defective;
C, roll piercing: with blank heating to 700～980 ℃, carry out 1～2 perforation with the two-roll oblique rolling mill group, use molybdenum plug or water-cooled top, perforation roll inclination angle is that 8 °, roll revolution are 40～90 basic speed～195r/min, promptly make hollow forging after the perforation, hollow forging specification external diameter is that φ 72～φ 125mm, wall thickness are that 5～20mm, length are 1500～6000mm;
D, cold rolling: the waste tube outer surface that makes after the roll piercing is carried out reconditioning, adopt two cold mill groups, multiple rollers cold calender group, KPW25 milling train or SWK75 mill milling (promptly cold rolling) then, whenever finish once rolling after again through degreasing, annealing, pickling, straightening processing, circulate rolling like this and handle after promptly make finished product; Circulate rolling and handle in the semi-finished product annealing temperature: 750～850 ℃+air cooling, time 20～100min;
E, finished product heat treatment and service check, warehouse-in: with finished product heat treatment, the annealing temperature that makes: 700～800 ℃+air cooling, time 20～100min; Again by specification requirement detect a flaw, service check, warehouse-in; Trimmed size can be external diameter φ 10.0～φ 89.0 * wall thickness 1.0～16.0mm.
The described two cold mill groups of step (d) are LG80, LG55 or LG30 two cold mill groups.
The described multiple rollers cold calender group of step (d) is LD60, LD30 or LD15 multiple rollers cold calender group.
Adopt the inventive method to carry out two batches of productions altogether, two batches finished product is φ 25 * 1.5mm specification, and good with the pure titanium pipe surface quality of the inventive method manufacturing, every mechanical performance index all meets GB/T3624-95 or GB/T3625-95 requirement.
The invention is not restricted to the foregoing description, content of the present invention is described all can implement and have described good result.
Claims (4)
1. the manufacture method of a pure titanium seamless tubes is characterized in that comprising the following steps:
A, preparation tube blank bar material: it is finished product titanium ingot that titanium sponge is smelted through vacuum consumable electrode arc furnace, and again through forging into tube blank bar material, the diameter of tube blank bar material is φ 50～φ 130mm;
B, tube blank bar material machined: it is the blank of 650～4500mm that the tube blank bar material sawing is become length; With horizontal centring machine centering, its internal point scope is at φ 18 ± 0.5～φ 30 ± 0.5mm then; And then with peeling locomotive light blank surface defective;
C, roll piercing: with blank heating to 700～980 ℃, carry out 1～2 perforation with the two-roll oblique rolling mill group, use molybdenum plug or water-cooled top, perforation roll inclination angle is that 8 °, roll rotational speed are 40 basic speed～195r/min, promptly make hollow forging after the perforation, hollow forging specification external diameter is that φ 72～φ 125mm, wall thickness are that 5～20mm, length are 1500～6000mm;
D, cold rolling: the waste tube outer surface that makes after the roll piercing is carried out reconditioning, adopt two cold mill groups, multiple rollers cold calender group, KPW25 milling train, SWK75 milling train or HPT160 mill milling then, whenever finish once rolling after again through degreasing, annealing, pickling, straightening processing, circulate rolling like this and handle after promptly make finished product; Circulate rolling and handle in the semi-finished product annealing temperature: 750～850 ℃, time 20～100min, air cooling then;
E, finished product heat treatment and service check, warehouse-in: with the finished product heat treatment that makes, 700～800 ℃ of annealing temperatures, time 20～100min, air cooling then; Again by specification requirement detect a flaw, service check, warehouse-in; Trimmed size is external diameter φ 10.0～φ 89.0, wall thickness 1.0～16.0mm.
2. by the manufacture method of the described pure titanium seamless tubes of claim 1, it is characterized in that: the described two cold mill groups of step (d) are LG80, LG55 or LG30 two cold mill groups.
3. by the manufacture method of the described pure titanium seamless tubes of claim 1, it is characterized in that: the described multiple rollers cold calender group of step (d) is LD60, LD30 or LD15 multiple rollers cold calender group.
4. by the manufacture method of the described pure titanium seamless tubes of claim 1, it is characterized in that: the described titanium sponge of step (a) is with one-level or secondary titanium sponge.
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