CN114367534B - Production process of pure titanium cold-rolled bright-surface titanium belt - Google Patents
Production process of pure titanium cold-rolled bright-surface titanium belt Download PDFInfo
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- CN114367534B CN114367534B CN202111528194.9A CN202111528194A CN114367534B CN 114367534 B CN114367534 B CN 114367534B CN 202111528194 A CN202111528194 A CN 202111528194A CN 114367534 B CN114367534 B CN 114367534B
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 148
- 239000010936 titanium Substances 0.000 title claims abstract description 148
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 84
- 238000000137 annealing Methods 0.000 claims abstract description 46
- 238000005422 blasting Methods 0.000 claims abstract description 35
- 238000005238 degreasing Methods 0.000 claims abstract description 33
- 238000005554 pickling Methods 0.000 claims abstract description 24
- 238000005097 cold rolling Methods 0.000 claims abstract description 13
- 230000003746 surface roughness Effects 0.000 claims abstract description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 229910052786 argon Inorganic materials 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 238000001953 recrystallisation Methods 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 20
- 238000000227 grinding Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 230000002441 reversible effect Effects 0.000 claims description 5
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/106—Other heavy metals refractory metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/023—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by spraying
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
Abstract
The invention relates to the technical field of titanium coil production, and in particular discloses a production process of a pure titanium cold-rolled bright-surface titanium belt, which comprises the following steps: s1, heating a plate blank on a heating furnace, and then performing rough rolling and finish rolling to obtain a black skin titanium coil; s2, carrying out intermediate annealing and shot blasting pickling on the black skin titanium coil on the hot wire to obtain a pickled white coil; s3, cold rolling the pickled white coil obtained in the step S2 to obtain a cold-rolled titanium coil with the surface roughness Ra less than or equal to 0.6 mu m; s4, degreasing the cold-rolled titanium coil on a degreasing line, wherein degreasing uncoiling tension and coiling tension are both 5-20 kN; s5, placing the degreased cold rolled titanium coil into a vertical bell-type furnace, and carrying out recrystallization annealing treatment in an argon protective atmosphere; s6, flattening the cold-rolled titanium coil subjected to the treatment in the step S5 on a flattening machine to obtain a cold-rolled bright-surface titanium belt; the invention can solve the problems of high surface roughness, difficult control of the plate shape and uneven surface of the cold rolled titanium belt manufactured by the prior art.
Description
Technical Field
The invention relates to the technical field of titanium coil production, in particular to a production process of a pure titanium cold-rolled bright-surface titanium belt.
Background
The pure titanium has high specific strength, low density, high strength, good corrosion resistance and forming property, wherein the 3.0-4.0 mm pure titanium cold-rolled bright surface titanium strip plate is widely applied and favored in domestic fields such as household electrical appliances, tableware kitchen ware, sports industry, medical equipment and the like due to short production period, low production cost, high dimensional tolerance precision and good uniformity of products compared with the traditional 3.0-4.0 mm cold-rolled bright surface titanium plate.
At present, the production process of the 3.0-4.0 mm pure titanium cold-rolled bright-surface titanium belt in the industry has great technical difficulty, and compared with the cold-rolled titanium belt with the thickness of less than 3.0mm, the titanium belt has high surface roughness, the cold-rolled plate shape is difficult to control, and the problem of arched and side wave plate shape is easy to occur in the whole production process. The titanium belt is annealed by adopting a bell-type furnace, and the problem of adhesion on the surface of the titanium belt is easily caused by uneven heat conduction between titanium coil layers due to poor heat conduction of the titanium belt.
The production technology difficulties in the aspects cause the problems of long production period, high production cost, low yield, surface quality and the like of the cold-rolled titanium belt with the thickness of 3.0-4.0 mm compared with the cold-rolled titanium belt with the thickness of less than 3.0 mm.
Disclosure of Invention
The invention solves the technical problems that: the cold-rolled titanium belt has high surface roughness, difficult control of the shape, and easy occurrence of arched shape and side wave shape; and the adhesion problem easily occurs on the surface of the cold-rolled titanium strip.
The technical scheme of the invention is as follows:
a production process of a pure titanium cold-rolled bright-surface titanium belt comprises the following steps:
s1, hot rolling of slab
Heating the slab in a heating furnace at 870-890 ℃ for 260-300 min; then sequentially performing rough rolling and finish rolling to obtain a black skin titanium coil;
s2, annealing and shot blasting pickling the black skin titanium coil in the middle,
performing intermediate annealing and shot blasting pickling on the black skin titanium coil on the hot wire to obtain a pickled white coil;
the intermediate annealing adopts an annealing furnace to heat the black skin titanium coil to 750-790 ℃ with the travel speed of 8-12 m/min;
the shot blasting and acid washing process has shot blasting sand feeding amount of 700-1200 Kg/min and 1.5-3.0 mm spherical cast steel sand; the shot blasting speed is 60-80 m/s, and the injection angle is 38-52 degrees; concentration of acid solution usedThe ratio is as follows: HF with concentration of 18-24 g/L and HNO with concentration of 160-240 g/L 3 According to 1:3, mixing the materials in a mass ratio, wherein the temperature of the acid liquor is 40-60 ℃;
s3, pickling white coil cold rolling
Cold rolling the pickled white coil obtained in the step S2 from the thickness of 4.5-5.5 mm to 3.0-4.0 mm, the thickness tolerance of +/-0.10 mm, the total deformation of 27-35%, 7-pass rolling and the single-pass deformation of 2-8%, thereby obtaining a cold-rolled titanium coil with the surface roughness Ra less than or equal to 0.6 mu m;
s4, degreasing treatment
Degreasing the cold-rolled titanium coil obtained in the step S3 on a degreasing line, wherein the degreasing and uncoiling tension and the coiling tension are both 5-20 kN, the degreasing speed is 10-20 m/min, and the titanium coil is padded after degreasing to prevent layering;
s5, annealing treatment
Placing the degreased cold rolled titanium coil into a vertical bell-type furnace, and carrying out recrystallization annealing treatment in an argon protective atmosphere;
s6, leveling treatment
And (3) flattening the cold-rolled titanium coil processed in the step (S5) on a flattening machine, wherein the finish degree of a flattening roller is less than or equal to 0.60 mu m, the uncoiling tension is 30-100 kN, the flattening tension is 200-1500 kN, and the flattening speed is 50-80 m/min, so that the cold-rolled bright-surface titanium belt is obtained.
Further, the thickness of the cold-rolled bright-surface titanium belt obtained in the step S6 is 3.0-4.0 mm, and the error is +/-0.010 mm; the surface roughness Ra is 0.3-0.6 mu m, and the error is +/-0.02 mu m; surface hardness hrb=58 to 65, error is ±2; tensile strength: rm=240 to 360MPa; grain size: 6-10; the titanium belt plate shape is less than or equal to 10mm/m; the flatness and the smoothness of the obtained cold-rolled bright surface titanium belt are superior to those of the prior art, the surface quality is good, the adhesion is avoided, and the process level of the existing production of the cold-rolled bright surface titanium belt can be effectively improved.
Further, the rough rolling in the step S1 adopts a four-roller reversible rolling mill; rolling the slab from 200-220 mm to 35-40 mm, and 5-7 rolling passes, wherein the total deformation is 80-85%, and the single-pass deformation is 12-16%, so as to obtain a rough rolling blank; the deformation of the slab can be effectively and accurately controlled through reasonable design of rolling parameters from the slab to the rough rolling blank, so that the production quality and the production efficiency of rough rolling are improved.
Further, the finish rolling adopts a steckel mill or eight four-roll finishing mills; rolling the rough rolling blank from 35-40 mm to 4.5-5.5 mm, wherein the thickness tolerance is +/-0.20 mm, the total deformation is 83-89%, the single-pass deformation is 10-13%, and the finishing temperature is more than or equal to 700 ℃; the deformation of the rough rolling blank can be effectively and accurately controlled through reasonable design of the finish rolling parameters, so that the production quality and the production efficiency of finish rolling are improved.
Further, the single-side wave of the pickling white coil is less than or equal to 15mm/m, and the tower shape is less than or equal to 15mm; the pickled white roll can further reduce single-side waves after being subjected to flattening treatment, so that the product quality is improved.
Further, a water cooling device for cooling the lower surface of the end part of the rough rolling blank is arranged at the lower end of the finish rolling feed inlet, and the temperature of the lower surface of the end part of the rough rolling blank is controlled to be lower than the upper surface by 25-52 ℃; under the condition of the same rolling reduction, the warping amount of the rolled piece bent to the low-temperature surface after rolling gradually increases along with the increase of the temperature difference between the upper surface and the lower surface of the rolling inlet, namely the head of the rolled piece is bent to the side with low surface temperature; therefore, the problem of titanium plate seesaw is effectively solved through the water-cooling device, and the yield is effectively improved.
Further, the annealing treatment temperature in the step S5 is 600-650 ℃, and the heat preservation time is 15-20 hours; the cooling mode is carried out along with furnace cooling, and the furnace discharging temperature is 80-150 ℃. Reasonable setting of annealing treatment parameters can effectively improve production efficiency while guaranteeing yield strength, tensile strength and hardness.
Further, after the step S1 is completed, the black skin titanium coil passes through a plurality of groups of grinding wheels; the rotating speed of the grinding wheel is 8000-15000 r/min; the clamping force of the upper grinding wheel and the lower grinding wheel on the pickling white coil is 320-500N; the surface roughness can be further improved by grinding the grinding wheel treatment, and the stress distribution in the black skin titanium coil can be improved to a certain extent.
Further, brushing the upper and lower surfaces of the titanium belt by adopting an acid-resistant brush roller while performing shot blasting and acid washing treatment; the pickling effect can be improved by brushing.
The beneficial effects of the invention are as follows: according to the production process of the pure titanium cold-rolled bright-surface titanium belt, the shot blasting effect is adjusted by reasonably setting the shot blasting speed, the shot blasting angle and other technological parameters, and in the pickling process of the titanium material, the acid liquor concentration is controlled, so that the pickling effect is effectively improved, the hydrogen absorption amount is reduced, and the problem of linear peeling of the titanium belt is effectively avoided;
the invention improves the problems of rough surface and plate shape of cold rolling by formulating reasonable hot rolling deformation, on-line annealing and cold rolling deformation; and a reasonable coiling tension and a bell-type furnace annealing process are formulated, so that the problem of local adhesion of the surface caused by local overheating of the titanium belt in the annealing process due to large coiling tension of the titanium belt and unreasonable annealing process is avoided.
The invention can improve the production efficiency of the 3.0-4.0 mm cold-rolled titanium strip, reduce the production cost and improve the surface quality of the product, and obtain the 3.0-4.0 mm cold-rolled bright-surface titanium strip with excellent comprehensive performance; compared with the prior art, the method can reduce the production period and improve the yield.
Detailed Description
Example 1
A production process of a pure titanium cold-rolled bright-surface titanium belt comprises the following steps:
s1, hot rolling of slab
Heating the slab in a heating furnace at 870 ℃ for 260min; then sequentially performing rough rolling and finish rolling to obtain a black skin titanium coil;
the rough rolling adopts a four-roller reversible rolling mill; rolling the slab from 200mm to 35mm, wherein the total deformation is 80% and the single deformation is 16% in 5 rolling passes, so as to obtain a rough rolling blank;
the finish rolling adopts a steckel mill or eight four-roll finishing mills; rolling the rough rolling blank from 35mm to 4.5mm, wherein the thickness tolerance is-0.20 mm,7 rolling passes are performed, the total deformation is 83%, the single-pass deformation is 11.85%, and the final rolling temperature is 700 ℃;
s2, annealing and shot blasting pickling the black skin titanium coil in the middle,
performing intermediate annealing and shot blasting pickling on the black skin titanium coil on the hot wire to obtain a pickled white coil;
the intermediate annealing adopts an annealing furnace to heat the black skin titanium coil to 750 ℃ and the travel speed is 8m/min;
the shot blasting and sand discharging amount in the shot blasting and acid washing is 700Kg/min, and 1.5mm spherical casting steel sand is adopted; shot blasting speed is 60m/s, and injection angle is 38 degrees; the concentration ratio of the acid liquid used is as follows: HF at a concentration of 18g/L and HNO at a concentration of 160g/L 3 According to 1:3, mixing the materials in a mass ratio, wherein the temperature of the acid liquor is 40 ℃; and brushing the upper and lower surfaces of the titanium belt by adopting an acid-resistant brush roller while performing shot blasting and acid washing treatment.
S3, pickling white coil cold rolling
Cold rolling the pickled white coil obtained in the step S2, namely rolling the pickled white coil from the thickness of 4.5mm to 3.0mm, wherein the thickness tolerance is +/-0.10 mm, the total deformation is 27%, 7-pass rolling and single-pass deformation is 3.85%, so as to obtain a cold-rolled titanium coil with the surface roughness Ra of 0.6 mu m;
s4, degreasing treatment
The cold rolled titanium coil obtained in the step S3 is subjected to degreasing treatment on a degreasing line, degreasing and uncoiling tension and coiling tension are both 5kN, degreasing speed is 10m/min, and after degreasing, the titanium coil is subjected to paper padding to prevent layering;
s5, annealing treatment
Placing the degreased cold rolled titanium coil into a vertical bell-type furnace, and carrying out recrystallization annealing treatment in an argon protective atmosphere;
the annealing treatment temperature is 600 ℃, and the heat preservation time is 15 hours; the cooling mode is carried out along with furnace cooling, and the furnace discharging temperature is 80 ℃.
S6, leveling treatment
And (3) flattening the cold-rolled titanium coil processed in the step (S5) on a flattening machine, wherein the finish degree of a flattening roller is 0.60 mu m, the uncoiling tension is 30kN, the flattening tension is 200kN, and the flattening speed is 50m/min, so that the cold-rolled bright-surface titanium belt is obtained.
Example 2
A production process of a pure titanium cold-rolled bright-surface titanium belt comprises the following steps:
s1, hot rolling of slab
Heating the slab in a heating furnace at 890 ℃ for 300min; then sequentially performing rough rolling and finish rolling to obtain a black skin titanium coil;
the rough rolling adopts a four-roller reversible rolling mill; rolling the slab from 220mm to 40mm,7 rolling passes, wherein the total deformation is 85%, and the single-pass deformation is 12.14%, so as to obtain a rough rolling blank;
the finish rolling adopts a steckel mill or eight four-roll finishing mills; rolling the rough rolling blank from 40mm to 5.5mm, wherein the thickness tolerance is 0.20mm, the total deformation is 89%, the single-pass deformation is 11.13%, and the final rolling temperature is 705 ℃;
s2, annealing and shot blasting pickling the black skin titanium coil in the middle,
performing intermediate annealing and shot blasting pickling on the black skin titanium coil on the hot wire to obtain a pickled white coil;
the intermediate annealing adopts an annealing furnace to heat the black skin titanium coil to 790 ℃ and the travel speed is 12m/min;
the shot blasting and sand discharging amount in the shot blasting and acid washing is 1200Kg/min, and 3.0mm spherical cast steel sand is adopted; the shot blasting speed is 80m/s, and the injection angle is 52 degrees; the concentration ratio of the acid liquid used is as follows: HF at a concentration of 24g/L and HNO at a concentration of 240g/L 3 According to 1:3, mixing the materials in a mass ratio, wherein the temperature of the acid liquor is 60 ℃; and brushing the upper and lower surfaces of the titanium belt by adopting an acid-resistant brush roller while performing shot blasting and acid washing treatment.
S3, pickling white coil cold rolling
Cold rolling the pickled white coil obtained in the step S2, wherein the thickness is 5.5mm to 4.0mm, the thickness tolerance is 0.10mm, the total deformation is 35%, 7-pass rolling and single-pass deformation is 5%, and the cold rolled titanium coil with the surface roughness Ra of 0.58 mu m is obtained;
s4, degreasing treatment
The cold rolled titanium coil obtained in the step S3 is subjected to degreasing treatment on a degreasing line, degreasing and uncoiling tension and coiling tension are both 20kN, degreasing speed is 20m/min, and after degreasing, the titanium coil is subjected to paper padding to prevent layering;
s5, annealing treatment
Placing the degreased cold rolled titanium coil into a vertical bell-type furnace, and carrying out recrystallization annealing treatment in an argon protective atmosphere;
the annealing treatment temperature is 650 ℃, and the heat preservation time is 20 hours; the cooling mode is carried out along with furnace cooling, and the tapping temperature is 150 ℃.
S6, leveling treatment
And (3) flattening the cold-rolled titanium coil processed in the step (S5) on a flattening machine, wherein the finish degree of a flattening roller is 0.52 mu m, the uncoiling tension is 100kN, the flattening tension is 1500kN, and the flattening speed is 80m/min, so that the cold-rolled bright-surface titanium belt is obtained.
Example 3
A production process of a pure titanium cold-rolled bright-surface titanium belt comprises the following steps:
s1, hot rolling of slab
Heating the slab in a heating furnace at 880 ℃ for 280min; then sequentially performing rough rolling and finish rolling to obtain a black skin titanium coil;
the rough rolling adopts a four-roller reversible rolling mill; rolling the slab from 210mm to 38mm,6 rolling passes, wherein the total deformation is 82%, and the single-pass deformation is 13.67%, so as to obtain a rough rolling blank;
the finish rolling adopts a steckel mill or eight four-roll finishing mills; rolling the rough rolling blank from 38mm to 5mm, wherein the thickness tolerance is 0.15mm, the total deformation is 86%, the single-pass deformation is 12.28%, and the final rolling temperature is 735 ℃;
s2, annealing and shot blasting pickling the black skin titanium coil in the middle,
performing intermediate annealing and shot blasting pickling on the black skin titanium coil on the hot wire to obtain a pickled white coil;
the intermediate annealing adopts an annealing furnace to heat the black skin titanium coil to 770 ℃ and the travel speed is 10m/min;
the shot blasting and sand discharging amount in the shot blasting and acid washing is 950Kg/min, and 2.2mm spherical cast steel sand is adopted; the shot blasting speed is 70m/s, and the injection angle is 45 degrees; the concentration ratio of the acid liquid used is as follows: HF at a concentration of 21g/L and HNO at a concentration of 200g/L 3 According to 1:3, mixing the materials in a mass ratio, wherein the temperature of the acid liquor is 50 ℃; and brushing the upper and lower surfaces of the titanium belt by adopting an acid-resistant brush roller while performing shot blasting and acid washing treatment.
S3, pickling white coil cold rolling
Cold rolling the pickled white coil obtained in the step S2, wherein the thickness is from 5mm to 3.5mm, the thickness tolerance is 0.050mm, the total deformation is 31%,7 times of rolling and the single-time deformation is 4.4%, and the cold-rolled titanium coil with the surface roughness Ra of 0.45 mu m is obtained;
s4, degreasing treatment
Degreasing the cold-rolled titanium coil obtained in the step S3 on a degreasing line, wherein the degreasing and uncoiling tension and the coiling tension are both 12.5kN, the degreasing speed is 15m/min, and the titanium coil is padded after degreasing to prevent layering;
s5, annealing treatment
Placing the degreased cold rolled titanium coil into a vertical bell-type furnace, and carrying out recrystallization annealing treatment in an argon protective atmosphere;
the annealing treatment temperature is 625 ℃, and the heat preservation time is 17 hours; the cooling mode is carried out along with furnace cooling, and the tapping temperature is 115 ℃.
S6, leveling treatment
And (3) flattening the cold-rolled titanium coil processed in the step (S5) on a flattening machine, wherein the finish degree of a flattening roller is 0.3 mu m, the uncoiling tension is 60kN, the flattening tension is 800kN, and the flattening speed is 65m/min, so that the cold-rolled bright-surface titanium belt is obtained.
Example 4
Unlike example 3, the following is:
s1, arranging a water-cooling device for cooling the lower surface of the end part of the rough rolling blank at the lower end of the finish rolling feed inlet, and controlling the temperature of the lower surface of the end part of the rough rolling blank to be lower than the upper surface by 25 ℃;
after the step S1 is finished, the black skin titanium coil passes through a plurality of groups of grinding wheels; the rotating speed of the grinding wheel is 8000r/min; the clamping force of the upper and lower grinding wheels on the pickling white coil is 320N.
Example 5
Unlike example 3, the following is:
s1, arranging a water-cooling device for cooling the lower surface of the end part of the rough rolling blank at the lower end of the finish rolling feed inlet, and controlling the temperature of the lower surface of the end part of the rough rolling blank to be lower than 52 ℃ of the upper surface;
after the step S1 is finished, the black skin titanium coil passes through a plurality of groups of grinding wheels; the rotating speed of the grinding wheel is 15000r/min; the clamping force of the upper and lower grinding wheels on the pickling white coil is 500N.
Experimental example
Cold rolled bright titanium belts were produced by the method of examples 1 to 5, and the obtained cold rolled bright titanium belts were inspected and recorded as shown in tables 1 and 2 below:
table 1: size data detection of cold-rolled bright-surface titanium belt produced by each embodiment
Table 1: detection of cold-rolled bright surface titanium strip strength and grain size data produced in each example
By comparing the prior art with the cold-rolled bright-surface titanium belt obtained by the production process, the problems of rough surface and plate shape of the cold-rolled bright-surface titanium belt can be effectively improved by the rolling process, the intermediate annealing of the black skin titanium coil, the shot blasting pickling and other processes; greatly improves the mechanical properties such as tensile strength and the like of the cold-rolled bright surface titanium belt and obtains good comprehensive mechanical properties and tissues;
by setting reasonable coiling tension and a bell-type furnace annealing process, the problem of local adhesion of the surface caused by local overheating of the titanium belt in the annealing process due to large coiling tension of the titanium belt and unreasonable annealing process is avoided; thereby obtaining a cold-rolled bright-surface titanium belt with excellent surface quality;
comparative examples 1 to 5 it can be seen that example 5 in the technical scheme disclosed by the invention is the best embodiment, the product quality of the cold-rolled bright-surface titanium belt can be further improved through a grinding wheel and a water-cooling device, the tensile strength is 315MPa, the grain size is 9.5, the surface roughness is 0.32 mu m, and the titanium belt plate shape is 5.6mm/m.
Claims (9)
1. The production process of the pure titanium cold-rolled bright-surface titanium belt is characterized by comprising the following steps of:
s1, hot rolling of slab
Heating the slab in a heating furnace at 870-890 ℃ for 260-300 min; then sequentially performing rough rolling and finish rolling to obtain a black skin titanium coil;
s2, annealing and shot blasting pickling the black skin titanium coil in the middle,
performing intermediate annealing and shot blasting pickling on the black skin titanium coil on the hot wire to obtain a pickled white coil;
the intermediate annealing adopts an annealing furnace to heat the black skin titanium coil to 750-790 ℃ with the travel speed of 8-12 m/min;
the shot blasting and acid washing process has shot blasting sand feeding amount of 700-1200 Kg/min and 1.5-3.0 mm spherical cast steel sand; the shot blasting speed is 60-80 m/s, and the injection angle is 38-52 degrees; the concentration ratio of the acid liquid used is as follows: HF with concentration of 18-24 g/L and HNO with concentration of 160-240 g/L 3 According to 1:3, mixing the materials in a mass ratio, wherein the temperature of the acid liquor is 40-60 ℃;
s3, pickling white coil cold rolling
Cold rolling the pickled white coil obtained in the step S2 from the thickness of 4.5-5.5 mm to 3.0-4.0 mm, the thickness tolerance of +/-0.10 mm, the total deformation of 27-35%, 7-pass rolling and the single-pass deformation of 2-8%, thereby obtaining a cold-rolled titanium coil with the surface roughness Ra less than or equal to 0.6 mu m;
s4, degreasing treatment
Degreasing the cold-rolled titanium coil obtained in the step S3 on a degreasing line, wherein the degreasing and uncoiling tension and the coiling tension are both 5-20 kN, the degreasing speed is 10-20 m/min, and the titanium coil is padded after degreasing to prevent layering;
s5, annealing treatment
Placing the degreased cold rolled titanium coil into a vertical bell-type furnace, and carrying out recrystallization annealing treatment in an argon protective atmosphere;
s6, leveling treatment
And (3) flattening the cold-rolled titanium coil processed in the step (S5) on a flattening machine, wherein the finish degree of a flattening roller is less than or equal to 0.60 mu m, the uncoiling tension is 30-100 kN, the flattening tension is 200-1500 kN, and the flattening speed is 50-80 m/min, so that the cold-rolled bright-surface titanium belt is obtained.
2. The production process of the pure titanium cold-rolled bright surface titanium strip according to claim 1, wherein the thickness of the cold-rolled bright surface titanium strip obtained in the step S6 is 3.0-4.0 mm, and the error is +/-0.010 mm; the surface roughness Ra is 0.3-0.6 mu m, and the error is +/-0.02 mu m; surface hardness hrb=58 to 65, error is ±2; tensile strength: rm=240 to 360MPa; grain size: 6-10; the titanium belt plate shape is less than or equal to 10mm/m.
3. The process for producing the pure titanium cold-rolled bright-surface titanium strip according to claim 1, wherein the rough rolling in the step S1 adopts a four-roller reversible rolling mill; rolling the slab from 200-220 mm to 35-40 mm, and 5-7 rolling passes, wherein the total deformation is 80-85%, and the single-pass deformation is 12-16%, thus obtaining the rough rolling blank.
4. A process for producing a pure titanium cold-rolled bright-surface titanium strip according to claim 3, wherein the finish rolling is performed by a steckel mill or an eight-roll finishing mill; the rough rolling blank is rolled from 35-40 mm to 4.5-5.5 mm, the thickness tolerance is +/-0.20 mm, the total deformation is 83-89%, the single-pass deformation is 10-13%, and the final rolling temperature is more than or equal to 700 ℃.
5. The production process of the pure titanium cold-rolled bright-surface titanium strip according to claim 1, wherein the single-side wave of the pickled white coil is less than or equal to 15mm/m, and the tower shape is less than or equal to 15mm.
6. The production process of the pure titanium cold-rolled bright-surface titanium strip according to claim 1, wherein a water cooling device for cooling the lower surface of the end part of the rough rolling blank is arranged at the lower end of the finish rolling feed port, and the temperature of the lower surface of the end part of the rough rolling blank is controlled to be lower than that of the upper surface by 25-52 ℃.
7. The production process of the pure titanium cold-rolled bright-surface titanium strip according to claim 1, wherein the annealing treatment temperature in the step S5 is 600-650 ℃, and the heat preservation time is 15-20 h; the cooling mode is carried out along with furnace cooling, and the furnace discharging temperature is 80-150 ℃.
8. The production process of the pure titanium cold-rolled bright-surface titanium belt according to claim 1, wherein after the step S1 is completed, the black skin titanium coil is subjected to a plurality of groups of grinding wheels; the rotating speed of the grinding wheel is 8000-15000 r/min; the clamping force of the upper and lower grinding wheels on the acid-washing white coil is 320-500N.
9. The production process of the pure titanium cold-rolled bright-surface titanium belt is characterized in that the upper surface and the lower surface of the titanium belt are brushed by adopting an acid-resistant brush roller while shot blasting and acid washing are carried out.
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