CN102581039A - Method for rolling pure titanium strip - Google Patents
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- CN102581039A CN102581039A CN2011100059853A CN201110005985A CN102581039A CN 102581039 A CN102581039 A CN 102581039A CN 2011100059853 A CN2011100059853 A CN 2011100059853A CN 201110005985 A CN201110005985 A CN 201110005985A CN 102581039 A CN102581039 A CN 102581039A
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000010936 titanium Substances 0.000 title claims abstract description 64
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 64
- 238000005096 rolling process Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims description 20
- 238000003801 milling Methods 0.000 claims description 17
- 238000002791 soaking Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000002950 deficient Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
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- 238000007747 plating Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a method for rolling a pure titanium strip. The rolling method includes steps material selection, pre-heating, rough rolling, fine rolling, and cooling and reeling; in combination with corresponding temperature control, the rolling production of pure titanium strips is achieved via common half-continuous rolling mills. The produced pure titanium strips have advantages of large weight and small thickness or the like; furthermore, the selectivity of material dimension is great, requirements on mass production of pure titanium strips are met.
Description
Technical field
The present invention relates to the manufacture craft of pure titanium strip, more particularly, relate to a kind of milling method of pure titanium strip.
Background technology
Titanium is one of more rich element of reserves in the earth's crust, and its content in the earth's crust is 0.6%, is only second to aluminium, iron, magnesium, accounts for the 4th.But from its industrial value, resource longevity and development prospect, it is only second to iron, aluminium again, is called as the third metal that is emerging.China is the very abundant country of a titanium resource, and the distribution of titanium ore spreads all over all over the motherland.Although 50,000 of the too late iron and steel of the output of the present titanium of China/, its strategic position in national economy is most important, and its application has spreaded all over many departments of national economy, is the all-round metal of energy-conservation, efficient and environmental protection.In recent years, titanium has obtained steady development in the application in civilian goods fields such as chemical industry, metallurgy, electric power, plating, food, medicine equipment and medical industry, computer, articles for daily use.The titanium strip mainly is a titanium alloy; Be used for compressor, fan blade, dish, guide vane, axle, shell, spar, wing flap, spoiler, enging cabin, dividing plate, undercarriage of aircraft engine etc.; Also have golf clubs, bulb and titanium eyes frame, artificial implant, medicine equipment, wrist-watch, camera shell, tennis racket, dash shoe tack, climbing gear, skis, cooker, crutch, jewellery etc. in addition.
At present, the titanium material mode of production be mainly steel-making with the titanium sponge melting after, be cast into the titanium ingot, after the breaking down cogging; Carry out surperficial peeling and handle, remove blemish, adopt modes such as drawing, forge hot to process once more then; And the rolling of titanium plate is main with Medium and Heavy Plate Rolling still at present, and the general coiled sheet mode of production is less, and main cause is that pure titanizing character is more active; Be prone to form defectives such as crackle during heating, pure titanium surface chemical property is active simultaneously, is prone to form bonding with roll; Rolling thickness is thin more, and surface control is more difficult, thereby is difficult in and produces qualified product on the thin plate tandem mill.
Application number is that 200810032041.3 Chinese patent discloses the method that broadband fever milling train group is produced metallic titanium plate in a kind of the employing; This method is lower than the slab of 50～90mm thickness in 100 ℃ the roller-bottom type soaking pit earlier with driving handling to furnace temperature; Centering; Make the furnace temperature of titanium slab region rise to 200～400 ℃ then, time≤200min progressively is warmed up to 800～1000 ℃ later on.Add from 100 ℃ and to be controlled in the 240min the total heat time heating time that is raised to 800～1000 ℃.Titanium slab after the heating is rolled through seven frame tandem mills.The temperature that requires to get into milling train is controlled at 800～950 ℃, and the titanium plate temperature after seven frame tandem mills are rolling is controlled at 700～800 ℃, and the precision coiling machine batches rolling after the laminar flow cooling.Though above-mentioned technology can be produced the heavy bigger titanium plate of volume, because the titanium slab can't directly carry out continuous casting at present; Making the titanium slab must first cold charge go into stove progressively heats; Thereby for continuous casting and rolling (CSP) flow process, the advantage that the heating furnace burnup is few has not existed, simultaneously; Because the titanium slab slowly heats up at roller hearth type heating furnace, must abandon at least one heating furnace and carry out ordinary production.Therefore the rhythm of production of whole product line must slow down, or waits for and take out steel.Simultaneously, because roller hearth type heating furnace can't heat the cold drawing base continuously, thereby take out the steel temperature being heated to from room temperature, heat time heating time is longer, inefficiency.
Application number is the production method that 200810013332.8 Chinese patent discloses pure titanium of a kind of big volume or titanium alloy roll coil of strip base, and this method guarantees the rolling temperature of titanium plate through special stay-warm case, thereby on reciprocating rolling mill, carries out the back and forth rolling of titanium plate.This method and Medium and Heavy Plate Rolling mode are approaching, and general sheet metal thickness is thicker, and sheet material length is restricted, and also need special stay-warm case come the rolling temperature in the assurance process, and in addition, the titanium of production volume weight is less, has only about 80Kg.
Summary of the invention
To the above-mentioned shortcoming that exists in the prior art, the purpose of this invention is to provide a kind of milling method of pure titanium strip, this method can utilize common semicontinuous rolling mill to produce pure titanium strip.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
The concrete steps of the milling method of this pure titanium strip are following:
A. choose pure titanium heavy slab as rolling raw material;
B. place walking beam heating furnace to be heated to 820～880 ℃ continuously slab;
C. the slab rough rolling of coming out of the stove is become intermediate blank, and the final temperature of intermediate blank is controlled to be 730～790 ℃;
D. intermediate blank finish rolling is become strip, and the final temperature of strip is controlled to be 650～690 ℃;
E. strip is carried out batching rolling after laminar flow is cooled to 550～600 ℃.
In steps A, the thickness of described pure titanium heavy slab is 150～250mm, and length is 4800～10000mm.
In step B, described continuous heating meets the following conditions:
B1. heating furnace is designed to several heating furnace sections, and sets the heating-up temperature of each heating furnace section;
B2. be controlled to be 1.0～1.2min * slab thickness mm total heat time heating time;
B3., it is 1～1.03 that the heating furnace air-fuel ratio is set.
Described heating furnace section comprises preheating section, first bringing-up section, second bringing-up section and soaking zone; Wherein, 630～650 ℃ of the design temperatures of preheating section, 730～750 ℃ of the design temperatures of first bringing-up section; 870～890 ℃ of the design temperatures of second bringing-up section, 880～900 ℃ of the design temperatures of soaking zone.
The concrete steps of described step C are following:
C1. the slab of coming out of the stove is removed surface scale through the roughing De-scaling box;
C2. get into roughing mill and carry out the roughing of reciprocal 5～7 passages, roll into the intermediate blank that thickness is 30～40mm;
C3. in the roughing process,, the final temperature of intermediate blank is controlled to be 730～790 ℃ through adjustment mill speed and reduction ratio.
The concrete steps of described step D are following:
D1. through cutter the intermediate blank head is sheared;
D2. remove surface scale through the finish rolling De-scaling box;
D3. becoming thickness through seven frame tandem mill finish rolling is the strip of 3～10mm;
D4. in the finish rolling process, depress through adjustment finish rolling and to distribute and speed, the final temperature of strip is controlled to be 650～690 ℃, and the tape speed of wearing of last frame is controlled to be less than 7.0m/s.
In described laminar flow cooling procedure, leading rate of laminar flow roller-way and hysteresis rate are controlled to be 7～8%.
In technique scheme; The milling method of pure titanium strip of the present invention comprise select materials, step such as preheating, roughing, finish rolling and cooling are batched; And combine corresponding temperature control, thus realizing carrying out the Rolling Production of pure titanium strip through common semi-tandem rolling unit, the pure titanium strip of its production has advantages such as weight is big, thin thickness; And the selectivity of raw materials size is also bigger, has satisfied pure titanium strip requirement of large-scale production.
Description of drawings
Fig. 1 is that application number is the flow chart of steps of 200810032041.3 titanium plate producing process;
Fig. 2 is the flow chart of steps of milling method of the present invention.
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
At first; Need to prove; The milling method of pure titanium strip of the present invention can adopt at present common semi-tandem rolling unit to realize, the device that relates to comprises De-scaling box before cutter before walking beam heating furnace, high-pressure water descaling case, reversing rougher, the finish rolling, the finish rolling, unidirectional type seven frame finishing mills, laminar flow cooling device, downcoiler number.
Embodiment 1
See also shown in Figure 2ly, the pure titanium slab of raw material is of a size of 150mm * 980mm * 10000mm, and rolling target size is the pure titanium roll of 10mm * 980mm (thick * wide).
Earlier slab is delivered to walking beam heating furnace and carry out continuously pre-heating, each stove section temperature of heating furnace is set as follows: wherein, heat-recovery section carries out preliminary preheating through adding hot exhaust gas to slab; 630 ℃ of the design temperatures of preheating section, 730 ℃ of the design temperatures of first bringing-up section, 870 ℃ of the design temperatures of second bringing-up section; 880 ℃ of the design temperatures of soaking zone; Time inside furnace is 180min, and heating furnace is empty right in being 1, and the tapping temperature of slab is 820 ℃;
After again slab being carried out the dephosphorization before the roughing, the input roughing mill carries out the roughing of reciprocal 5 passages, rolls into the intermediate blank that thickness is 40mm, and roughing mill outlet temperature (being the final temperature of intermediate blank) is controlled at 730 ℃;
After then intermediate blank being carried out the dephosphorization before the finish rolling, import seven frame tandem mills and carry out finish rolling, finish rolling outlet temperature (being the final temperature of strip) is controlled to be 650 ℃, tape speed 3.0m/s is worn in finish rolling;
At last, the strip that shuts out is cooled to 550 ℃ through laminar flow, and the leading rate of roller-way and hysteresis rate are controlled to be 7% and 8% respectively, after batching, after the rolling, are delivered to stacking separately in the storehouse through step rate.
Pure titanium roll through the present embodiment gained heavily is 6.97t, and its percentage elongation is 57%.
Embodiment 2
Different with embodiment 1 is, the pure titanium slab of raw material is of a size of 200mm * 980mm * 8000mm, and rolling target size is the pure titanium roll of 5mm * 980mm (thick * wide).
Earlier slab is delivered to walking beam heating furnace and carry out continuously pre-heating, each stove section temperature of heating furnace is set as follows: wherein, heat-recovery section carries out preliminary preheating through adding hot exhaust gas to slab; 640 ℃ of the design temperatures of preheating section, 740 ℃ of the design temperatures of first bringing-up section, 880 ℃ of the design temperatures of second bringing-up section; 890 ℃ of the design temperatures of soaking zone; Time inside furnace is 230min, and heating furnace is empty right in being 1.01, and the tapping temperature of slab is 850 ℃;
After again slab being carried out the dephosphorization before the roughing, the input roughing mill carries out the roughing of reciprocal 5 passages, rolls into the intermediate blank that thickness is 35mm, and roughing mill outlet temperature (being the final temperature of intermediate blank) is controlled at 763 ℃;
After then intermediate blank being carried out the dephosphorization before the finish rolling, import seven frame tandem mills and carry out finish rolling, finish rolling outlet temperature (being the final temperature of strip) is controlled to be 673 ℃, tape speed 6.0m/s is worn in finish rolling;
At last, the strip that shuts out is cooled to 587 ℃ through laminar flow, and the leading rate of roller-way and hysteresis rate are controlled to be 7% and 8% respectively, after batching, after the rolling, are delivered to stacking separately in the storehouse through step rate.
Pure titanium roll through the present embodiment gained heavily is 7.32t, and its percentage elongation is 58%.
Embodiment 3
Different with embodiment 1,2 is, the pure titanium slab of raw material is of a size of 250mm * 980mm * 5600mm, and rolling target size is the pure titanium roll of 3mm * 980mm (thick * wide).
Earlier slab is delivered to walking beam heating furnace and carry out continuously pre-heating, each stove section temperature of heating furnace is set as follows: wherein, heat-recovery section carries out preliminary preheating through adding hot exhaust gas to slab; 650 ℃ of the design temperatures of preheating section, 750 ℃ of the design temperatures of first bringing-up section, 890 ℃ of the design temperatures of second bringing-up section; 900 ℃ of the design temperatures of soaking zone; Time inside furnace is 250min, and heating furnace is empty right in being 1.03, and the tapping temperature of slab is 880 ℃;
After again slab being carried out the dephosphorization before the roughing, the input roughing mill carries out the roughing of reciprocal 5 passages, rolls into the intermediate blank that thickness is 30mm, and roughing mill outlet temperature (being the final temperature of intermediate blank) is controlled at 790 ℃;
After then intermediate blank being carried out the dephosphorization before the finish rolling, import seven frame tandem mills and carry out finish rolling, finish rolling outlet temperature (being the final temperature of strip) is controlled to be 690 ℃, tape speed 7.0m/s is worn in finish rolling;
At last, the strip that shuts out is cooled to 600 ℃ through laminar flow, and the leading rate of roller-way and hysteresis rate are controlled to be 7% and 8% respectively, after batching, after the rolling, are delivered to stacking separately in the storehouse through step rate.
Pure titanium roll through the present embodiment gained heavily is 6.45t, and its percentage elongation is 57%.
Through detecting, above-mentioned three embodiment rolling titanium strip surface good, reach following requirement:
1, surface film oxide is fine and close, no serious selective oxidation skin defective such as nip;
2, the surface does not have the defective of scuffing;
3, surperficial flawless, limit portion does not have defectives such as breach;
4, finished product does not have flat volume phenomenon, yield rate 100%.
In sum, adopt the milling method of pure titanium strip of the present invention can be applicable to common semi-tandem rolling unit at present, compared with prior art, have following advantage:
1, can heat up continuously, accomplish continuous production;
2, can reduce depressing passage and receiving the place and the restriction of transportation of blooming mill, enhance productivity;
3, need not special attemperator, and the volume great (reaching more than the 5t) that produces, thin thickness.
Thereby for the production scale that realize to enlarge pure titanium strip, enhance productivity and the end product quality of pure titanium strip provides strong foundation and support.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not to be used as qualification of the present invention; As long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (7)
1. the milling method of a pure titanium strip is characterized in that,
The concrete steps of this method are following:
A. choose pure titanium heavy slab as rolling raw material;
B. place walking beam heating furnace to be heated to 820～880 ℃ continuously slab;
C. the slab rough rolling of coming out of the stove is become intermediate blank, and the final temperature of intermediate blank is controlled to be 730～790 ℃;
D. intermediate blank finish rolling is become strip, and the final temperature of strip is controlled to be 650～690 ℃;
E. strip is carried out batching rolling after laminar flow is cooled to 550～600 ℃.
2. the milling method of pure titanium strip as claimed in claim 1 is characterized in that:
In steps A, the thickness of described pure titanium heavy slab is 150～250mm, and length is 4800～10000mm.
3. the milling method of pure titanium strip as claimed in claim 1 is characterized in that,
In step B, described continuous heating meets the following conditions:
B1. heating furnace is designed to several heating furnace sections, and sets the heating-up temperature of each heating furnace section;
B2. be controlled to be 1.0～1.2min * slab thickness mm total heat time heating time;
B3., it is 1～1.03 that the heating furnace air-fuel ratio is set.
4. the milling method of pure titanium strip as claimed in claim 3 is characterized in that:
Described heating furnace section comprises preheating section, first bringing-up section, second bringing-up section and soaking zone; Wherein, 630～650 ℃ of the design temperatures of preheating section, 730～750 ℃ of the design temperatures of first bringing-up section; 870～890 ℃ of the design temperatures of second bringing-up section, 880～900 ℃ of the design temperatures of soaking zone.
5. the milling method of pure titanium strip as claimed in claim 1 is characterized in that,
The concrete steps of described step C are following:
C1. the slab of coming out of the stove is removed surface scale through the roughing De-scaling box;
C2. get into roughing mill and carry out the roughing of reciprocal 5～7 passages, roll into the intermediate blank that thickness is 30～40mm;
C3. in the roughing process,, the final temperature of intermediate blank is controlled to be 730～790 ℃ through adjustment mill speed and reduction ratio.
6. the milling method of pure titanium strip as claimed in claim 1 is characterized in that,
The concrete steps of described step D are following:
D1. through cutter the intermediate blank head is sheared;
D2. remove surface scale through the finish rolling De-scaling box;
D3. becoming thickness through seven frame tandem mill finish rolling is the strip of 3～10mm;
D4. in the finish rolling process, depress through adjustment finish rolling and to distribute and speed, the final temperature of strip is controlled to be 650～690 ℃, and the tape speed of wearing of last frame is controlled to be less than 7.0m/s.
7. the milling method of pure titanium strip as claimed in claim 1 is characterized in that:
In described laminar flow cooling procedure, leading rate of laminar flow roller-way and hysteresis rate are controlled to be 7～8%.
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| CN103215433A (en) * | 2013-03-18 | 2013-07-24 | 酒泉钢铁(集团)有限责任公司 | Heating method for heating industrial pure titanium slabs in series with heating furnaces |
| CN103599927A (en) * | 2013-11-26 | 2014-02-26 | 四川西南不锈钢有限责任公司 | Hot rolling titanium plate production method and system |
| CN104028555A (en) * | 2014-05-30 | 2014-09-10 | 云南钛业股份有限公司 | Method for directly rolling EB blank by using hot continuous rolling mill to obtain pure titanium coil |
| TWI485259B (en) * | 2012-12-28 | 2015-05-21 | China Steel Corp | Method for reducing surface defects of small steel embryos |
| CN104975249A (en) * | 2015-06-15 | 2015-10-14 | 上海工程技术大学 | Surface modification method for pure titanium |
| CN105710141A (en) * | 2016-02-02 | 2016-06-29 | 攀钢集团江油长城特殊钢有限公司 | Hot-rolled titanium coil and surface quality control method thereof |
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