CN116174486A - Industrial pure titanium hot continuous rolling method free of post process annealing - Google Patents
Industrial pure titanium hot continuous rolling method free of post process annealing Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
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Abstract
The invention belongs to the technical field of industrial pure titanium rolling, and relates to an industrial pure titanium hot continuous rolling method free from post process annealing, which comprises the following steps: (1) heating and preserving the heat of an industrial pure titanium plate blank; (2) Rolling the industrial pure titanium plate blank by adopting a roughing mill to obtain an intermediate blank; (3) Rolling the intermediate blank by a finishing mill group to obtain an industrial pure titanium belt; (4) The industrial pure titanium belt is cooled in the conveying process on a laminar cooling roller way and is coiled into an industrial pure titanium coil by a coiling machine; and (5) rapidly placing the industrial pure titanium coil in a hot coil area for slow cooling. The industrial pure titanium hot continuous rolling method without post process annealing can avoid the annealing process before the industrial pure titanium strip cold rolling and directly carry out pickling cold rolling, thereby improving the yield and the production efficiency of the cold rolled titanium strip, saving energy and reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of industrial pure titanium rolling, relates to an industrial pure titanium hot continuous rolling method free of post process annealing, and particularly relates to a technology for producing industrial pure titanium on a hot continuous rolling production line without annealing before cold rolling.
Background
Titanium and titanium alloy have the characteristics of high specific strength, high temperature resistance, low temperature resistance, corrosion resistance, no magnetism, no toxicity and the like, are widely applied to the fields of aerospace, aviation, ocean, petroleum, chemical industry, metallurgy, electric power, construction, medical treatment, sports and the like, and are known as space metal, ocean metal and strategic metal. The cold rolled titanium strip accounts for about 60% of the total titanium processing material, can be directly or processed into welded pipes for manufacturing plate heat exchangers and heat exchange pipes, and is applied to the fields of oil refineries, coastal power stations, offshore drilling platforms, sea water desalination and the like.
Before implementing the patent of the invention, the traditional production process flow of the cold rolled titanium belt is as follows: titanium blank, heating, rough rolling by a hot continuous rolling mill or a steckel mill, finish rolling, coiling, annealing of a hot rolled titanium strip, shot blasting, pickling, cold rolling, degreasing, annealing of a cold rolled titanium strip and finishing. According to the process flow, the hot rolled titanium strip produced on the hot continuous rolling mill or steckel mill production line must be annealed first and then can enter the cold rolling production line for production, so that the whole process production time of the cold rolled titanium strip is prolonged, the production efficiency is reduced, the production energy consumption is increased, and the production cost is increased.
The production cost is high, which is a common technical problem facing the titanium material processing industry, and development of new technology is needed in the field of hot and cold rolled titanium strip production so as to improve the yield and production efficiency of the cold rolled titanium strip, save energy and reduce the production cost.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides an industrial pure titanium hot continuous rolling method free of post process annealing.
Specifically, the industrial pure titanium hot continuous rolling method free of post process annealing comprises the following steps:
(1) Heating and preserving the heat of an industrial pure titanium plate blank;
(2) Rolling the industrial pure titanium plate blank by adopting a roughing mill to obtain an intermediate blank;
(3) Rolling the intermediate blank by a finishing mill group to obtain an industrial pure titanium belt;
(4) The industrial pure titanium belt is cooled in the conveying process on a laminar cooling roller way and is coiled into an industrial pure titanium coil by a coiling machine;
(5) The industrial pure titanium coil is rapidly placed in a hot coil area for slow cooling.
In the step (1), the heating is performed by adopting a heating furnace, the heating speed is 18-28 ℃/h, the heating temperature is 775-795 ℃, and the heat preservation time is 160-190min.
According to the industrial pure titanium hot continuous rolling method free of post process annealing, the number of rough rolling passes is 5, and the technological parameters of each pass are as follows:
| pass of rolling | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 |
| Rolling temperature (. Degree. C.) | 766-786 | 761-781 | 757-777 | 751-771 | 746-766 |
| Rolling speed (m/s) | 3.5-4.5 | 3.9-4.9 | 4.1-5.1 | 4.5-5.5 | 5.6-6.6 |
| Absolute depression (mm) | 23.8-32.3 | 30.7-40.0 | 28.2-37.3 | 24.8-33.9 | 22.5-31.7 |
。
The industrial pure titanium hot continuous rolling method free of post process annealing comprises the steps of adopting 7-frame finishing mill groups for rolling, and finishing mill technological parameters are as follows:
| frame numbering | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Rolling temperature (. Degree. C.) | 710-730 | 703-723 | 694-714 | 686-706 | 677-697 | 663-683 | 650-670 |
| Rolling speed (m/s) | 1.5-1.7 | 1.8-2.0 | 2.7-2.9 | 3.5-3.7 | 4.4-4.6 | 5.1-5.3 | 5.7-5.9 |
| Absolute depression (mm) | 10.5-14.8 | 6.8-10.6 | 4.3-6.3 | 2.5-3.6 | 1.3-2.0 | 0.6-1.2 | 0.5-0.8 |
。
In the step (4), the cooling rate of the cooling is 2.096-2.169 ℃/s, and the temperature after cooling is 620-640 ℃.
According to the industrial pure titanium hot continuous rolling method free of post process annealing, the temperature of the hot rolling area is 550-650 ℃, and the slow cooling time is 24-48 hours.
The industrial pure titanium hot continuous rolling method free of post process annealing, wherein the brand of the industrial pure titanium comprises the following steps: TA0, TAl, TA2, TA3, TA4.
The industrial pure titanium hot continuous rolling method free of post process annealing is characterized in that the industrial pure titanium slab is a forged titanium slab suitable for hot continuous rolling production or a titanium slab produced by an electron beam cooling bed furnace.
The industrial pure titanium hot continuous rolling method free of the annealing in the rear working procedure is characterized in that the heating furnace is a push steel type heating furnace, a step heating furnace, a trolley heating furnace or a roller hearth heating furnace.
According to the industrial pure titanium hot continuous rolling method free of post process annealing, the heating furnace is heated by coal gas, natural gas or electricity.
The technical scheme of the invention has the following beneficial effects:
according to the industrial pure titanium hot continuous rolling method free of post process annealing, the mechanical properties of the industrial pure titanium strips in the hot rolling state (R), TA2 and TA3 meet the requirement of the annealing state (M) by controlling the process parameters such as the heating rate, the heating temperature, the heat preservation time, the rolling temperatures of a roughing mill and a finishing mill group, the rolling speed, the absolute rolling reduction, the cooling rate and the coiling temperature of the industrial pure titanium strips, the cooling rate of the industrial pure titanium rolls and the like, so that the annealing process before the industrial pure titanium strips are cold-rolled can be omitted, the direct pickling cold rolling is performed, the yield and the production efficiency of the cold-rolled titanium strips are improved, the energy is saved, and the production cost is reduced.
Detailed Description
The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features, and effects of the present invention. The process of the present invention is carried out by methods or apparatus conventional in the art, except as described below. The following terms have the meanings commonly understood by those skilled in the art unless otherwise indicated.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
Specifically, the industrial pure titanium hot continuous rolling method free of post process annealing comprises the following steps:
(1) Heating and preserving the heat of an industrial pure titanium plate blank;
(2) Rolling the industrial pure titanium plate blank by adopting a roughing mill to obtain an intermediate blank;
(3) Rolling the intermediate blank by a finishing mill group to obtain an industrial pure titanium belt;
(4) The industrial pure titanium belt is cooled in the conveying process on a laminar cooling roller way and is coiled into an industrial pure titanium coil by a coiling machine;
(5) The industrial pure titanium coil is rapidly placed in a hot coil area for slow cooling.
The industrial pure titanium hot continuous rolling method without post process annealing provided by the invention has the advantages that the hot rolled titanium strip produced on the hot continuous rolling production line does not need annealing and can directly enter the cold rolling production line for production, so that the aims of shortening the whole process production time of the cold rolled titanium strip, improving the production efficiency, reducing the energy consumption and reducing the production cost are achieved.
In some preferred embodiments, the post process annealing free industrial pure titanium hot continuous rolling method of the present invention comprises the following steps.
(1) Heating and preserving the heat of the industrial pure titanium plate blank.
In order to realize high-quality, high-efficiency and high-reliability heating of the industrial pure titanium plate blank, the heating speed is controlled to be 18-28 ℃/h, the heating temperature is controlled to be 775-795 ℃, and the heat preservation time is controlled to be 160-190min, so that a process foundation is laid for finally realizing post-process-free annealing.
It has been found in practice that if the heating rate of an industrial pure titanium slab is less than 18 c/h, a decrease in heating efficiency results. The heat conductivity coefficient of the industrial pure titanium is lower, about 1/4 of nickel, 1/5 of iron and 1/14 of aluminum, if the heating rate of the industrial pure titanium plate blank is higher than 28 ℃/h, the inner and outer temperature gradients of the plate blank are large, thermal stress is easy to generate, and the plate blank is broken in a heating furnace when the thermal stress is large. And comprehensively considering the above factors, and determining the heating rate of the industrial pure titanium plate blank to be 18-28 ℃/h.
Titanium has a very strong affinity for oxygen at high temperatures. An oxide film is formed by surface oxidation in the initial heating stage of an industrial pure titanium slab. When heated to 500 ℃ or higher, the titanium oxide film becomes porous, thickened and easily peeled off, oxygen continuously diffuses into the substrate through pores in the film, and a hard and brittle layer is formed inside the titanium, thereby reducing the plasticity thereof. When heated at 650 ℃ or higher, the titanium oxide reacts strongly, and when heated at 700 ℃ or higher, it reacts with nitrogen to form a surface gettering layer, which deteriorates the deformability of industrial pure titanium. Therefore, the heating should be performed at a temperature as low as possible in view of reducing the tendency of the industrial pure titanium slab to suck air and improving the thermoplasticity, but if the heating temperature is too low, the deformation resistance of the industrial pure titanium slab is increased and the load on the rolling mill is increased. The heating temperature of the industrial pure titanium plate blank is determined to be 775-795 ℃ by considering the above factors.
The industrial pure titanium is in an alpha phase of a close-packed hexagonal structure at normal temperature and is converted into a beta phase of a body-centered cubic structure at 882 ℃. When the thermal deformation is performed in the β -phase region, the grain size increases and the plasticity decreases, whereas when the thermal deformation is performed in the α -phase region at as low a temperature as possible, the grain size of the industrial pure titanium decreases and the plasticity increases. The heating temperature of the industrial pure titanium plate blank is determined to be 775-795 ℃, the thermal deformation of the industrial pure titanium plate blank in an alpha phase area can be ensured, and a good process foundation is laid for the uniform fine crystal structure and higher plasticity of the finished industrial pure titanium.
If the heat preservation time of the industrial pure titanium slab is shorter than 160min, the temperature gradient of the section of the slab is large, and thermal stress and thermal cracking are easy to generate, so that cracking defects occur in the rolling process; if the heat preservation time is longer than 190min, the getter layer on the surface of the plate blank is thickened, and the heating energy consumption is increased. And comprehensively considering the factors, and determining the heat preservation time of the industrial pure titanium plate blank to be 160-190min.
Wherein the brand of industrial pure titanium includes, but is not limited to: TA0, TAl, TA2, TA3, TA4.
Preferably, the thickness of the industrial pure titanium slab is 160-230mm, the width is 1000-2100mm, and the length is 5000-10000mm, and the industrial pure titanium slab is a forged titanium slab suitable for hot continuous rolling production or a titanium slab produced by an electron beam cooling bed furnace.
Preferably, the heating is performed by a heating furnace, and the heating furnace is a push steel type heating furnace, a step heating furnace, a trolley heating furnace or a roller hearth heating furnace. Wherein the heating furnace adopts gas, natural gas or electric heating.
(2) And rolling the industrial pure titanium plate blank by adopting a roughing mill to obtain an intermediate blank.
Preferably, the rough rolling is performed in 5 passes, and the process parameters of each pass are shown in table 1.
Table 1 rough rolling process parameters of commercial pure titanium slabs
| Pass of rolling | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 |
| Rolling temperature (. Degree. C.) | 766-786 | 761-781 | 757-777 | 751-771 | 746-766 |
| Rolling speed (m/s) | 3.5-4.5 | 3.9-4.9 | 4.1-5.1 | 4.5-5.5 | 5.6-6.6 |
| Absolute depression (mm) | 23.8-32.3 | 30.7-40.0 | 28.2-37.3 | 24.8-33.9 | 22.5-31.7 |
Practice shows that if the rolling temperature of the industrial pure titanium slab is lower than the lower limit specified in table 1, the deformation resistance and load of the roughing mill are increased sharply, and the equipment safety is affected; if the rolling temperature is higher than the upper limit specified in table 1, the grain size of the industrial pure titanium increases and the plasticity decreases. Taking the above factors into consideration, the rolling temperature of 5 rough rolling passes of the industrial pure titanium plate blank is determined to be 766-786 ℃, 761-781 ℃, 757-777 ℃, 751-771 ℃ and 746-766 ℃ in sequence.
If the rolling speed of the industrial pure titanium slab is lower than the lower limit specified in table 1, the rolling efficiency of the roughing mill is reduced, and the yield is reduced; if the rolling speed is higher than the upper limit specified in Table 1, not only the deformation resistance and load of the roughing mill are increased, but also the heat effect of deformation causes the temperature of the slab to be excessively raised locally or entirely, resulting in uneven structure and comprehensive properties. The rolling speed of 5 passes of rough rolling of the industrial pure titanium plate blank is determined to be 3.5-4.5m/s, 3.9-4.9m/s, 4.1-5.1m/s, 4.5-5.5m/s and 5.6-6.6m/s in sequence by comprehensively considering the factors.
If the absolute rolling reduction of the commercial pure titanium slab is lower than the lower limit specified in table 1, the phenomenon of uneven crystal grains occurs and the plasticity is lowered. If the absolute rolling reduction is higher than the upper limit specified in table 1, not only the deformation resistance and load of the roughing mill are improved, but also the buckling and warping phenomenon occurs, and in severe cases, a roll winding accident may occur, resulting in hidden equipment trouble. The absolute rolling reduction of 5 passes of rough rolling of the industrial pure titanium plate blank is determined to be 23.8-32.3mm, 30.7-40.0mm, 28.2-37.3mm, 24.8-33.9mm and 22.5-31.7mm in sequence by comprehensively considering the above factors.
Preferably, the industrial pure titanium slab is rough rolled to obtain an intermediate billet with the thickness of 30-45 mm.
(3) And rolling the intermediate blank by a finishing mill group to obtain the industrial pure titanium belt.
Preferably, the finish rolling is performed by using a 7-frame finishing mill group, and the finishing mill process parameters are shown in Table 2.
TABLE 2 finish rolling process parameters for commercial pure titanium strip
| Frame numbering | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Rolling temperature (. Degree. C.) | 710-730 | 703-723 | 694-714 | 686-706 | 677-697 | 663-683 | 650-670 |
| Rolling speed (m/s) | 1.5-1.7 | 1.8-2.0 | 2.7-2.9 | 3.5-3.7 | 4.4-4.6 | 5.1-5.3 | 5.7-5.9 |
| Absolute depression (mm) | 10.5-14.8 | 6.8-10.6 | 4.3-6.3 | 2.5-3.6 | 1.3-2.0 | 0.6-1.2 | 0.5-0.8 |
Practice shows that if the rolling temperature of the industrial pure titanium strip is lower than the lower limit specified in Table 2, the deformation resistance and load of each frame of the finishing mill group are increased sharply, and the equipment safety is affected; if the rolling temperature is higher than the upper limit specified in table 2, the grain size of the industrial pure titanium strip increases and the plasticity decreases. The rolling temperature of each frame of the industrial pure titanium belt finishing mill group is determined to be 710-730 ℃, 703-723 ℃, 694-714 ℃, 686-706 ℃, 677-697 ℃, 663-683 ℃ and 650-670 ℃ in sequence by comprehensively considering the above factors.
If the rolling speed of the industrial pure titanium strip is lower than the lower limit specified in table 2, the rolling efficiency is lowered, and the yield is lowered; if the rolling speed is higher than the upper limit specified in Table 2, not only the deformation resistance and load of each stand of the finishing mill group are increased, but also the deformation thermal effect causes the local or whole temperature rise of the industrial pure titanium strip to be too high, resulting in uneven structure and comprehensive performance. The rolling speed of each frame of the industrial pure titanium belt finishing mill group is determined to be 1.5-1.7m/s, 1.8-2.0m/s, 2.7-2.9m/s, 3.5-3.7m/s, 4.4-4.6m/s, 5.1-5.3m/s and 5.7-5.9m/s in sequence by comprehensively considering the factors.
If the absolute rolling reduction of the industrial pure titanium ribbon is lower than the lower limit specified in table 2, the phenomenon of uneven grain will occur, and the plasticity will be lowered. If the absolute rolling reduction is higher than the upper limit specified in Table 2, the deformation resistance and load of each frame of the finishing mill group are increased, resulting in potential equipment hazards. The absolute rolling reduction of each frame of the industrial pure titanium belt finishing mill group is determined to be 10.5-14.8mm, 6.8-10.6mm, 4.3-6.3mm, 2.5-3.6mm, 1.3-2.0mm, 0.6-1.2mm and 0.5-0.8mm in sequence by comprehensively considering the above factors.
Further preferably, the intermediate billet is rolled by a finishing mill group to obtain an industrial pure titanium belt with the thickness of 2.0-8.0mm and the width of 1000-2100 mm.
(4) The industrial pure titanium belt is cooled in the conveying process on the laminar cooling roller way, and is coiled into an industrial pure titanium coil by a coiling machine.
Preferably, the cooling rate of the cooling is 2.096-2.169 ℃/s, and the temperature after cooling is 620-640 ℃, so that the strength of the industrial pure titanium belt can be reasonably controlled, the plasticity is improved, the method is one of important measures for realizing annealing without a rear process, and the strong plastic product of the industrial pure titanium belt can be controlled in an optimal range.
Further, it is found that when the cooling rate is less than 2.096 ℃/s, the temperature after cooling is higher than the target 640 ℃; when the cooling rate is greater than 2.169 ℃/s, the temperature after cooling is lower than the target 620 ℃; when the cooled temperature is lower than 620 ℃, the strength of the industrial pure titanium belt is improved, and the plasticity is reduced; when the temperature after cooling is higher than 640 ℃, the strength of the industrial pure titanium belt is reduced, and the strength and plastic product are reduced.
(5) The industrial pure titanium coil is rapidly placed in a hot coil area for slow cooling.
Preferably, the temperature of the hot rolling area is 550-650 ℃, and the slow cooling time is 24-48 hours.
The invention can reasonably control the strength of the industrial pure titanium belt and improve the plasticity by controlling the temperature of the hot rolling area and the slow cooling time in the range, is one of important measures for realizing annealing without a rear procedure, and can control the strength and the plastic product of the industrial pure titanium belt in the optimal range without reducing the production efficiency.
Further, the practice shows that when the temperature of the hot rolling area is lower than 550 ℃, the strength of the industrial pure titanium belt is improved, and the plasticity is reduced; when the temperature of the hot rolling area is higher than 650 ℃, the strength of the industrial pure titanium belt is reduced, and the strength and plastic product are reduced. When the slow cooling time is shorter than 24 hours, the structure of the industrial pure titanium belt is uneven, and the plasticity is reduced; when the slow cooling period is longer than 48 hours, the production efficiency is lowered.
The comparison between the actual measurement performance of the TAl, TA2 and TA3 industrial pure titanium belts produced by the industrial pure titanium hot continuous rolling technology without post process annealing according to the invention and the stipulated performance of GB/T3621-2007 titanium and titanium alloy plate is shown in tables 3, 4 and 5 respectively.
TABLE 3 comparison of actual measured properties of TAl Industrial pure titanium belts with standards
TABLE 4 comparison of actual measurement Performance of TA2 Industrial pure titanium Belt with Standard
TABLE 5TA3 comparison of actual measured properties of Industrial pure titanium belts with standards
As can be seen from tables 3, 4 and 5, the yield strength Rp0.2, the tensile strength Rm, the elongation A and the 105-degree cold bending performance of the industrial pure titanium strip in the hot rolled state (R) TAl, TA2 and TA3 produced by the technology of the invention meet the corresponding performance requirements of the annealing state (M) in GB/T3621-2007 titanium and titanium alloy sheet, so that the annealing process before the industrial pure titanium strip cold rolling can be omitted, and the cold rolling can be directly performed by pickling, thereby improving the yield and the production efficiency of the cold rolled titanium strip, saving energy and reducing the production cost.
It can also be seen from tables 3, 4 and 5 that the hot rolled (R) TAl, TA2, TA3 industrial pure titanium strips produced according to the inventive technique have better cold roll properties, wherein the TAl industrial pure titanium strips are perfect at 105 ° and 180 ° d=0 cold roll and the TA2, TA3 industrial pure titanium strips are perfect at 105 ° and 180 ° d=t cold roll. The industrial pure titanium belt has moderate strong plastic product, wherein the strong plastic products of TAl, TA2 and TA3 are respectively 12.8-19.9, 12.9-17.2 and 14.0-17.9GPa percent.
Examples
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods without specific conditions noted in the following examples follow conventional methods and conditions.
Example 1
The embodiment is an annealing hot continuous rolling technology without a rear process when a TAI industrial pure titanium belt is produced on a 1549mm hot continuous rolling production line.
(1) Heating
A TAl industrial pure titanium slab (EB slab) having a thickness of 160mm, a width of 1235mm and a length of 7968mm was charged into a step-type heating furnace heated with natural gas, and the slab was heated to 793 ℃ at a heating rate of 20 ℃/h and kept for 188 minutes.
(2) Rough rolling
And after the EB billet is discharged from the furnace, rough rolling is carried out according to the process of the table 6, and an intermediate billet with the thickness of 30mm is obtained.
TABLE 6 roughing process parameters for TAl commercial pure titanium billets in example 1
| Pass of rolling | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 |
| Rolling temperature (. Degree. C.) | 783 | 779 | 776 | 768 | 762 |
| Rolling speed (m/s) | 4.32 | 4.86 | 5.05 | 5.48 | 6.33 |
| Absolute depression (mm) | 23.86 | 31.89 | 28.65 | 24.98 | 22.62 |
(3) Finish rolling
The intermediate billet enters a 7-frame finishing mill group for rolling, and the finishing mill technological parameters are shown in table 7.
TABLE 7 finish rolling process parameters for TAl commercial pure titanium strip in example 1
| Frame numbering | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Rolling temperature (. Degree. C.) | 728 | 720 | 711 | 703 | 693 | 679 | 688 |
| Rolling speed (m/s) | 1.63 | 1.98 | 2.83 | 3.66 | 4.59 | 5.28 | 5.81 |
| Absolute depression (mm) | 10.58 | 7.09 | 5.03 | 2.57 | 1.52 | 0.70 | 0.51 |
And rolling by a finishing mill group to obtain the TAl industrial pure titanium belt with the thickness of 2.0mm and the width of 1230 mm.
(4) Cooling and coiling of TAl industrial pure titanium belt
The TAl industrial pure titanium strip rolled from the finishing mill group is cooled to 622 ℃ at a cooling rate of 2.166 ℃/s in the process of being conveyed on a laminar cooling roller way, and is coiled into an industrial pure titanium coil by a coiling machine, namely the coiling temperature of the TAl industrial pure titanium strip is 622 ℃.
(5) Cooling of TAl industrial pure titanium coil
The TAl industrial pure titanium coil was rapidly placed in a hot coil zone for slow cooling for 39 hours at a temperature of 611 ℃.
(6) Properties of TAl industrial pure titanium belt
The comparison between the actual measurement performance of the TAl industrial pure titanium strip produced by the industrial pure titanium hot continuous rolling technology without post process annealing according to this example and the prescribed performance of GB/T3621-2007 titanium and titanium alloy sheet is shown in Table 8.
Table 8 comparison of actual measured properties of TAl commercial pure titanium tape with standards in example 1
As can be seen from Table 8, the yield strength Rp0.2, the tensile strength Rm, the elongation A and the 105-degree cold bending performance of the hot rolled (R) TAl industrial pure titanium strip produced by the technology of the embodiment meet the corresponding performance requirements of the annealed (M) state in GB/T3621-2007 titanium and titanium alloy sheet, so that the annealing process before the cold rolling of the TAl industrial pure titanium strip can be omitted, the direct pickling cold rolling can be performed, the yield and the production efficiency of the TAl cold rolled titanium strip can be improved, the energy can be saved, and the production cost can be reduced.
It can also be seen from table 8 that the hot rolled (R) TAl industrial pure titanium strip produced according to the technique of this example has better cold bending properties, with 105 ° and 180 ° d=0 cold bending perfect. The TAl industrial pure titanium belt of the embodiment has moderate strong plastic product (15.6 GPa percent).
Example 2
The embodiment is an annealing hot continuous rolling technology without a rear process when a TA2 industrial pure titanium belt is produced on a 2250mm hot continuous rolling production line.
(1) Heating
A TA2 industrial pure titanium slab (forged titanium blank) with the thickness of 180mm, the width of 1925mm and the length of 6510mm is placed into a step heating furnace heated by natural gas, and the slab is heated to 788 ℃ according to the heating rate of 23 ℃ per hour and is kept for 180 minutes.
(2) Rough rolling
After the forged titanium blank was taken out of the furnace, rough rolling was performed according to the process shown in Table 9 to obtain an intermediate blank having a thickness of 40 mm.
Table 9 roughing process parameters for TA2 commercial pure titanium billets in example 2
| Pass of rolling | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 |
| Rolling temperature (. Degree. C.) | 778 | 770 | 766 | 760 | 753 |
| Rolling speed (m/s) | 3.98 | 4.31 | 4.56 | 5.03 | 6.08 |
| Absolute depression (mm) | 24.28 | 33.70 | 28.81 | 29.91 | 23.30 |
(3) Finish rolling
The intermediate billet enters a 7-frame finishing mill group for rolling, and the finishing mill process parameters are shown in table 10.
TABLE 10 finish rolling process parameters for TA2 commercial pure titanium belts in example 2
| Frame numbering | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Rolling temperature (. Degree. C.) | 722 | 715 | 708 | 701 | 686 | 671 | 659 |
| Rolling speed (m/s) | 1.58 | 1.91 | 2.78 | 3.62 | 4.53 | 5.21 | 5.78 |
| Absolute depression (mm) | 12.73 | 9.62 | 5.23 | 3.02 | 1.68 | 1.01 | 0.69 |
And rolling by a finishing mill group to obtain the TA2 industrial pure titanium belt with the thickness of 6.0mm and the width of 1920 mm.
(4) TA2 industrial pure titanium belt cooling and coiling
The TA2 industrial pure titanium strip rolled from the finishing mill group was cooled to 628 ℃ at a cooling rate of 2.103 ℃/s during transportation on a laminar cooling roller table, and coiled into an industrial pure titanium coil by a coiling machine, i.e., the coiling temperature of the TA2 industrial pure titanium strip was 628 ℃.
(5) TA2 industrial pure titanium coil cooling
The TA2 industrial pure titanium coil was rapidly placed in a hot coil zone for slow cooling for 32 hours at a temperature of 603 ℃.
(6) TA2 Industrial pure titanium Belt Performance
The comparison between the actual measurement performance of the TA2 industrial pure titanium belt produced by the industrial pure titanium hot continuous rolling technology without post process annealing according to the embodiment and the stipulated performance of GB/T3621-2007 titanium and titanium alloy plate is shown in Table 11.
As can be seen from Table 11, the yield strength Rp0.2, the tensile strength Rm, the elongation A and the 105 DEG cold bending property of the TA2 industrial pure titanium belt in the hot rolled state (R) produced by the technique of the embodiment satisfy the comparison of the actual measurement property and the standard of the TA2 industrial pure titanium belt in the embodiment 2 of GB/T table 11
3621-2007 (titanium and titanium alloy sheet) corresponding performance requirements of an annealing state (M) in the process of cold rolling of the TA2 industrial pure titanium belt can be omitted, and the annealing process before cold rolling is directly performed, so that the yield and the production efficiency of the TA2 cold-rolled titanium belt are improved, energy sources are saved, and the production cost is reduced.
It can also be seen from table 11 that the hot rolled (R) TA2 industrial pure titanium strip produced according to the technique of this example had better cold bending properties, with 105 ° and 180 ° d=t cold bending intact. The commercial pure titanium belt of this example TA2 has a moderate hard plastic product (15.3 GPa%).
Example 3
The embodiment is an annealing hot continuous rolling technology without a rear process when a TA3 industrial pure titanium belt is produced on a 2250mm hot continuous rolling production line.
(1) Heating
A TA3 industrial pure titanium slab (forged titanium blank) having a thickness of 206mm, a width of 1930mm and a length of 5730mm was charged into a step heating furnace heated with natural gas, and the slab was heated to 778℃at a heating rate of 26℃per hour and kept at that temperature for 163 minutes.
(2) Rough rolling
After the forged titanium blank was discharged, rough rolling was performed according to the process shown in Table 12 to obtain an intermediate blank having a thickness of 43 mm.
Table 12 roughing process parameters for TA3 commercial pure titanium billets in example 3
| Pass of rolling | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 |
| Rolling temperature (. Degree. C.) | 768 | 763 | 759 | 755 | 749 |
| Rolling speed (m/s) | 3.59 | 3.96 | 4.13 | 4.56 | 5.73 |
| Absolute depression (mm) | 30.25 | 37.73 | 33.21 | 32.93 | 28.88 |
(3) Finish rolling
The intermediate billet enters a 7-frame finishing mill group for rolling, and the finishing mill technological parameters are shown in table 13.
TABLE 13 finish rolling process parameters for TA3 commercial pure titanium belts in example 3
| Frame numbering | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Rolling temperature (. Degree. C.) | 713 | 706 | 696 | 689 | 680 | 665 | 653 |
| Rolling speed (m/s) | 1.51 | 1.82 | 2.73 | 3.55 | 4.43 | 5.12 | 5.75 |
| Absolute depression (mm) | 12.98 | 9.86 | 5.28 | 3.15 | 1.87 | 1.08 | 0.78 |
And rolling by a finishing mill group to obtain the TA3 industrial pure titanium belt with the thickness of 8.0mm and the width of 1920 mm.
(4) TA3 industrial pure titanium belt cooling and coiling
The TA3 industrial pure titanium strip rolled from the finishing mill group is cooled to 636 ℃ at a cooling rate of 2.099 ℃/s in the process of conveying on a laminar cooling roller way, and is coiled into an industrial pure titanium coil by a coiling machine, namely, the coiling temperature of the TA3 industrial pure titanium strip is 636 ℃.
(5) TA3 industrial pure titanium coil cooling
The TA3 industrial pure titanium coil was rapidly placed in the hot coil zone and slowly cooled for 28 hours at a temperature of 596 ℃.
(6) TA3 Industrial pure titanium Belt Performance
The comparison between the actual measurement performance of the TA3 industrial pure titanium belt produced by the industrial pure titanium hot continuous rolling technology without post process annealing according to the embodiment and the stipulated performance of GB/T3621-2007 titanium and titanium alloy plate is shown in Table 14.
TABLE 14 comparison of measured properties of TA3 commercially pure titanium belts with standards in example 3
As can be seen from Table 14, the yield strength Rp0.2, the tensile strength Rm, the elongation A and the 105-degree cold bending performance of the TA3 industrial pure titanium strip produced by the technology of the embodiment meet the corresponding performance requirements of the annealing state (M) in GB/T3621-2007 titanium and titanium alloy sheet, so that the annealing process before the TA3 industrial pure titanium strip cold rolling can be omitted, and the direct pickling cold rolling can be performed, thereby improving the yield and the production efficiency of the TA3 cold rolling titanium strip, saving energy and reducing the production cost.
It can also be seen from table 14 that the hot rolled (R) TA3 industrial pure titanium strip produced according to the technique of the present example has better cold bending properties, with 105 ° and 180 ° d=tdiff perfect. The commercial pure titanium belt of this example TA3 has a moderate hard plastic product (16.6 GPa%).
The present invention has been disclosed above in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are considered to be covered by the scope of the claims of the present invention. The scope of the invention should, therefore, be determined with reference to the appended claims.
Claims (10)
1. An industrial pure titanium hot continuous rolling method free of post process annealing, which is characterized by comprising the following steps:
(1) Heating and preserving the heat of an industrial pure titanium plate blank;
(2) Rolling the industrial pure titanium plate blank by adopting a roughing mill to obtain an intermediate blank;
(3) Rolling the intermediate blank by a finishing mill group to obtain an industrial pure titanium belt;
(4) The industrial pure titanium belt is cooled in the conveying process on a laminar cooling roller way and is coiled into an industrial pure titanium coil by a coiling machine;
(5) The industrial pure titanium coil is rapidly placed in a hot coil area for slow cooling.
2. The post-process annealing-free industrial pure titanium hot continuous rolling method according to claim 1, wherein in the step (1), the heating is performed by a heating furnace, the heating speed is 18-28 ℃/h, the heating temperature is 775-795 ℃, and the heat preservation time is 160-190min.
3. The post-process annealing-free industrial pure titanium hot continuous rolling method according to claim 1, wherein the rough rolling passes are 5 passes, and each pass has the following process parameters:
。
4. The post-process annealing-free industrial pure titanium hot continuous rolling method according to claim 1, wherein the finish rolling is performed by adopting 7-frame finishing mill groups, and the finishing mill process parameters are as follows:
。
5. The post process annealing free industrial pure titanium hot continuous rolling method according to claim 1, wherein in the step (4), the cooling rate of the cooling is 2.096-2.169 ℃/s, and the temperature after the cooling is 620-640 ℃.
6. The post process annealing free industrial pure titanium hot continuous rolling method according to claim 1, wherein the temperature of the hot coil zone is 550-650 ℃, and the slow cooling time is 24-48 hours.
7. The post process annealing free industrial pure titanium hot continuous rolling method according to claim 1, wherein said industrial pure titanium grade comprises: TA0, TAl, TA2, TA3, TA4.
8. The post process annealing free industrial pure titanium hot continuous rolling method according to claim 1, wherein said industrial pure titanium slab is a forged titanium slab suitable for hot continuous rolling production or a titanium slab produced with an electron beam cold hearth furnace.
9. The post-process annealing-free industrial pure titanium hot continuous rolling method according to claim 2, wherein the heating furnace is a push-steel type heating furnace, a step-by-step type heating furnace, a trolley type heating furnace or a roller hearth type heating furnace.
10. The post process annealing free industrial pure titanium hot continuous rolling method according to claim 2 or 9, wherein said heating furnace is gas, natural gas or electric heating.
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