CN114602971A - Production process of pure titanium ingot by one-step firing - Google Patents
Production process of pure titanium ingot by one-step firing Download PDFInfo
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- CN114602971A CN114602971A CN202210348644.4A CN202210348644A CN114602971A CN 114602971 A CN114602971 A CN 114602971A CN 202210348644 A CN202210348644 A CN 202210348644A CN 114602971 A CN114602971 A CN 114602971A
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000010936 titanium Substances 0.000 title claims abstract description 88
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 88
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 238000010304 firing Methods 0.000 title claims description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 53
- 238000002791 soaking Methods 0.000 claims abstract description 22
- 238000009749 continuous casting Methods 0.000 claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 230000007547 defect Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 238000005242 forging Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production process of a pure titanium ingot one-shot finished product, which comprises the following steps of a, paving a track at the bottom of a push type heating furnace, wherein the track consists of a plurality of continuous casting square billets, a clamp is arranged on the continuous casting square billets, b, the push type heating furnace is used for heating a titanium round ingot made of TA1, the titanium round ingot passes through the push type heating furnace along the track and is sequentially subjected to preheating, heating and soaking treatment, the preheating temperature is 650-750 ℃, the heating temperature is 1000-. The invention has the advantages of high production efficiency, low production cost and high production yield, and the obtained bar has good mechanical property.
Description
Technical Field
The invention belongs to the field of production processes of pure titanium bars, and particularly relates to a production process of pure titanium ingots through one-step sintering.
Background
The existing production process of industrial pure titanium (TA1) bars comprises the following steps: firstly, casting a titanium round ingot by a vacuum consumable electrode furnace; forging and pressing the titanium round ingot into a titanium square billet with a certain size through multiple times of heating, wherein the heating must be carried out in a kiln type heating furnace because the ignition point of titanium is low, the titanium round ingot can be forged and pressed into the square billet through multiple times because the titanium round ingot is large in size, the titanium round ingot needs to be returned to the kiln type heating furnace for tempering after each forging and pressing, and the titanium square billet with the composite requirement can be obtained through multiple times of repeated heating and pressing; and then heating and rolling the titanium billet into a bar. The existing production process of the pure titanium bar has a long production flow, so that the production efficiency is low, the production cost is high, certain loss is generated when a round titanium ingot is forged and pressed each time, the loss comprises oxidation loss of materials, the shape of a blank formed after each forging and pressing is possibly irregular, the grinding loss caused by further cooling and grinding is needed, and the production yield is low (the yield is 84-87%) due to accumulation of multiple losses. Therefore, the existing production process of the pure titanium bar has the defects of low production efficiency, high production cost and low production yield.
Disclosure of Invention
The invention aims to provide a production process of a pure titanium ingot through one-step sintering. The invention has the advantages of high production efficiency, low production cost and high production yield, and the obtained bar has good mechanical properties.
The technical scheme of the invention is as follows: a production process of a pure titanium ingot by one-step firing, which comprises the following steps,
a. a track is laid at the bottom of the push type heating furnace, the track is composed of a plurality of continuous casting square billets made of heat-resistant stainless steel materials, a clamp for guiding the movement of materials is arranged on the continuous casting square billets,
b. the steel pushing type heating furnace is used for heating a titanium round ingot made of TA1 material, the titanium round ingot passes through the steel pushing type heating furnace along a track and is sequentially subjected to preheating, heating and soaking treatment, the preheating temperature is 650-750 ℃, the heating temperature is 1030 ℃ and the soaking temperature is 980 ℃ and 1010 ℃.
c. Rolling the titanium round ingot after being heated into a square billet by a cogging mill for 19-30 times to obtain a billet of the titanium square billet,
d. cutting off the end heads at the two ends of the blank body to obtain a titanium square blank,
e. continuously rolling the titanium square billet into a bar by using a continuous rolling mill, wherein the temperature of the titanium square billet before continuous rolling is 700-800 ℃, and the finish rolling temperature is 680-780 ℃.
In the above production process of pure titanium ingot by one heating, in the step a, the material of the heat-resistant stainless steel is 310S.
In the above production process of pure titanium ingot by one-shot sintering, in the step b, the time of the preheating treatment is 1.5-2.5h, the time of the heating treatment is 1.0-1.5h, and the time of the soaking treatment is 1.0-1.5 h.
In the production process of the pure titanium ingot through one-step heating, in the step b, the soaking temperature in the step b is 1000 ℃.
In the foregoing production process of a pure titanium ingot through one-shot forming, in the step c, the cogging pass is 23 to 25 times.
In the foregoing production process of a pure titanium ingot by one-shot sintering, in the step d, the length of the end head cut off is 30-50 cm.
In the above production process of pure titanium ingot through one-shot forming, in the step a, a plurality of continuous casting billets are laid along the advancing direction of the material, and the continuous casting billets are perpendicular to the advancing direction of the material.
Compared with the prior art, the titanium round steel is placed in the push type heating furnace for heating, firstly, the problem that the titanium round steel rubs with the furnace rib pipe to cause spontaneous combustion when moving in the push type heating furnace is solved, the continuous casting square billet made of 310S materials is laid in the push type heating furnace, and the titanium round steel is prevented from rolling in the moving process and rubbing with the furnace rib pipe through the clamp, so that the titanium round steel is prevented from rubbing and spontaneous combustion. And then the heated titanium round steel is rolled into a square billet by a cogging mill in multiple passes, the square billet is rolled into a bar by a continuous rolling mill, and in the process of manufacturing the titanium round steel into the square billet, the titanium round steel does not need to be repeatedly tempered, so that one-shot forming is realized, the production flow is shortened, the production efficiency is improved, the production cost is reduced, the loss in rolling is small, and the yield is improved. The invention further reduces the generation of the hot cracks on the surface of the square billet and the single-side peeling amount of a finished product by controlling the heating parameters of the titanium round ingot and the process control in the rolling process of the cogging mill, further improves the yield, and the yield can reach 97%. In addition, the mechanical yield strength of the bar produced by the invention can reach 250MPa, the tensile strength can reach 450MPa, the elongation can reach 32%, the mechanical property is far beyond the national standard requirement, and the mechanical property is good. Therefore, the invention has the advantages of high production efficiency, low production cost and high production yield, and the obtained bar has good mechanical properties.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example 1 (best mode). A production process of a pure titanium ingot by one-step firing, which comprises the following steps,
a. the track is laid at the bottom of the push steel type heating furnace and is composed of a plurality of continuous casting square billets made of 310S materials, and the continuous casting square billets are provided with clamps for guiding the movement of materials, are square and are placed on two sides of a material moving path and used for preventing the titanium round ingots from rolling when moving. The continuous casting square billet is made of metals made of different materials, and is subjected to a contrast test, so that the titanium round ingot cannot spontaneously combust when moving on the continuous casting square billet, the continuous casting square billet is good in heat resistance, difficult to oxidize in a heating process, good in wear resistance, difficult to generate oxide skin on the surface, difficult to drop to cause pollution to the titanium round ingot on the titanium round ingot, and the produced bar is ensured to meet the requirements, and 310S is found to meet the requirements according to a contrast result.
b. The steel pushing type heating furnace is used for heating a titanium round ingot made of TA1, the titanium round ingot passes through the steel pushing type heating furnace along a track and is sequentially preheated, heated and soaked, the preheating temperature is 700 ℃, the heating temperature is 1015 ℃, and the soaking temperature is 1000 ℃.
c. Rolling the titanium round ingot subjected to the heat treatment into a square billet by a 750 cogging mill, wherein the cogging pass is 24 times, the finish rolling temperature of the titanium round ingot is 815 ℃, the finish rolling temperature of the titanium round ingot is 790 ℃, and a billet of the titanium square billet is obtained,
d. and cutting off the end heads at the two ends of the blank, wherein the cutting length of the end heads is 30-50cm, the specific cutting length is determined according to the defect length at the two ends of the blank, but the actual cutting length range is within the range of 30-50cm, and the titanium square blank is obtained.
e. Continuously rolling the titanium square billet into a bar by using a continuous rolling mill, wherein the rolling passes are 6 times, and the continuous rolling temperature is 750 ℃ and the final rolling temperature is 730 ℃.
In the step b, the preheating treatment time is 2 hours, the heating treatment time is 1.25 hours, and the soaking treatment time is 1.25 hours.
In the step a, a plurality of continuous casting square billets are laid along the advancing direction of the material, and the continuous casting square billets are perpendicular to the advancing direction of the material.
The size specification of the titanium round ingot is phi 480 x 2000mm, the weight is 1.5-1.6 tons, and the specification of the produced bar material is phi 91.5 mm. Push away steel formula heating furnace is current equipment, furnace body length 35 meters, and width 4.5 meters, total 5 heating regions that independently adjust the temperature arrange according to material advancing direction, are preheating section, heating 1 end, heating 2 sections, heating 3 sections and soaking section in proper order, wherein heating 1 section, heating 2 sections, heating 3 sections and soaking section all have upper and lower formula nozzle.
Example 2. Compared with example 1, the difference is that: in the step b, the preheating temperature is 650 ℃, the preheating time is 2.5h, the heating temperature is 1000 ℃, the heating time is 1.5h, the soaking temperature is 980 ℃, and the soaking time is 1.5 h; in the step c, the cogging pass is 23 times, the finish rolling temperature of the titanium round ingot is 800 ℃, and the finish rolling temperature of the titanium round ingot is 780 ℃; in the step e, the continuous rolling temperature is 700 ℃, and the final rolling temperature is 680 ℃.
Example 3. Compared with example 1, the difference is that: in the step b, preheating temperature is 750 ℃, preheating time is 1.5h, heating temperature is 1030 ℃, heating time is 1h, soaking temperature is 1010 ℃, and soaking time is 1 h; in the step c, the cogging pass is 25 times, the finish rolling temperature of the titanium round ingot is 830 ℃, and the finish rolling temperature of the titanium round ingot is 800 ℃; in the step e, the continuous rolling temperature is 800 ℃, and the finishing temperature is 780 ℃.
Example 4. Compared with the embodiment 1, the difference is that the soaking temperature is adjusted to 965 ℃, compared with the soaking temperature reduction of the embodiment 1, the hardness of the titanium round ingot after being discharged from the furnace is correspondingly higher, so the cogging pass in the step c is correspondingly increased to 28 times, the deformation amount of each cogging is reduced, and the cogging defect is avoided as much as possible. As the temperature of the titanium round ingot discharged from the furnace is reduced, the finish rolling temperature of the corresponding titanium round ingot is reduced to about 790 ℃, and the finish rolling temperature of the titanium round ingot is about 770 ℃.
Example 5. Compared with the embodiment 1, the difference is that the soaking temperature is adjusted to 1025 ℃, compared with the soaking temperature increase of the embodiment 1, the hardness of the titanium round ingot after being discharged from the furnace is correspondingly lower, so the cogging pass in the step c is correspondingly reduced to 20 times, and the production efficiency is improved. As the temperature of the discharged titanium round ingot is increased, the finish rolling temperature of the corresponding titanium round ingot is increased to about 845 ℃, and the finish rolling temperature of the titanium round ingot is about 815 ℃.
Table 1 is a comparison of examples 1, 4 and 5.
TABLE 1
As the table 1 shows that different soaking temperatures have large influence on the finishing rolling temperature, the transformation temperature of titanium is about 800 ℃, and the plasticity of the material is deteriorated due to the excessively high or excessively low deformation temperature, so that the defect lengths at the head end and the tail end and the surface defect depth are directly influenced. Comparing the three schemes of the embodiments 1, 4 and 5, the scheme of the embodiment 1 is the best, the yield can reach 97%, the unilateral peeling amount is the minimum, and the surface quality is the best.
Table 2 shows the comparison of the bars obtained in examples 1, 4 and 5 with the parameters required by the current national standards.
TABLE 2
As can be seen from Table 2, the bar of example 4 has a low finish rolling temperature, a low finish rolling temperature and a high yield strength due to a large number of passes, but may not meet the national standard because of a low elongation. In the embodiment 5, since the number of rolling passes is small, the finish rolling temperature is high, and the elongation is high, but the yield strength may not meet the national standard. The bar of example 1 achieved all parameter indexes and far exceeded the national standard requirements, and therefore, the mechanical properties were very good.
Claims (7)
1. A production process of a pure titanium ingot by one-step firing is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
a. a track is laid at the bottom of the push type heating furnace, the track is composed of a plurality of continuous casting square billets made of heat-resistant stainless steel materials, a clamp for guiding the movement of materials is arranged on the continuous casting square billets,
b. the steel pushing type heating furnace is used for heating a titanium round ingot made of TA1 material, the titanium round ingot passes through the steel pushing type heating furnace along a track and is sequentially subjected to preheating, heating and soaking treatment, wherein the preheating temperature is 650-750 ℃, the heating temperature is 1030 ℃ and the soaking temperature is 980 ℃ and 1010 ℃,
c. rolling the titanium round ingot after being heated into a square billet by a cogging mill for 19-30 times to obtain a billet of the titanium square billet,
d. cutting off the end heads at the two ends of the blank body to obtain a titanium square blank,
e. continuously rolling the titanium square billet into a bar by using a continuous rolling mill, wherein the temperature of the titanium square billet is 700 ℃ and 800 ℃ before the titanium square billet is continuously rolled.
2. The process for producing a pure titanium ingot by one-shot forming according to claim 1, wherein: in the step a, the material of the heat-resistant stainless steel is 310S.
3. The process for producing a pure titanium ingot by one-shot forming according to claim 1, wherein: in the step b, the preheating treatment time is 1.5-2.5h, the heating treatment time is 1.0-1.5h, and the soaking treatment time is 1.0-1.5 h.
4. The process for producing a pure titanium ingot by one-shot forming according to claim 1, wherein: in the step b, the soaking temperature is 1000 ℃.
5. The process for producing a pure titanium ingot by one-shot forming according to claim 1, wherein: in the step c, the cogging pass is 23-25 times.
6. The process for producing a pure titanium ingot by one-shot forming according to claim 1, wherein: in the step d, the cutting length of the end head is 30-50 cm.
7. The process for producing a pure titanium ingot by one-shot forming according to claim 1, wherein: in the step a, a plurality of continuous casting square billets are laid along the advancing direction of the material, and the continuous casting square billets are perpendicular to the advancing direction of the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210348644.4A CN114602971A (en) | 2022-04-01 | 2022-04-01 | Production process of pure titanium ingot by one-step firing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210348644.4A CN114602971A (en) | 2022-04-01 | 2022-04-01 | Production process of pure titanium ingot by one-step firing |
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Citations (7)
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|---|---|---|---|---|
| JPS6240908A (en) * | 1985-08-16 | 1987-02-21 | Nippon Steel Corp | Rolling method for titanium billet having square or round section with less surface flaws |
| CN1609240A (en) * | 2004-11-22 | 2005-04-27 | 宝钢集团上海五钢有限公司 | Method for heating titanium and titanium alloy ingot |
| CN2707771Y (en) * | 2004-03-23 | 2005-07-06 | 宝钢集团上海五钢有限公司 | Soaking furnace insulation tool for preventing titanium ingot from spontaneous combustion |
| CN104148382A (en) * | 2014-07-21 | 2014-11-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for manufacturing titanium and titanium alloy bars by means of hot continuous rolling |
| CN105710127A (en) * | 2016-03-17 | 2016-06-29 | 武钢集团昆明钢铁股份有限公司 | Method for producing industrial pure titanium rod by semi-continuous rolling |
| CN111940507A (en) * | 2020-07-02 | 2020-11-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for rolling thin and wide titanium plate in one fire |
| CN114178310A (en) * | 2021-12-02 | 2022-03-15 | 昆明理工大学 | Method for rolling titanium alloy rod and wire by adopting multiple passes |
-
2022
- 2022-04-01 CN CN202210348644.4A patent/CN114602971A/en active Pending
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| CN111940507A (en) * | 2020-07-02 | 2020-11-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for rolling thin and wide titanium plate in one fire |
| CN114178310A (en) * | 2021-12-02 | 2022-03-15 | 昆明理工大学 | Method for rolling titanium alloy rod and wire by adopting multiple passes |
Non-Patent Citations (1)
| Title |
|---|
| 解晨;冯军宁;王田;冯永琦;羊玉兰;杨慧丽;: "轧制工艺对纯钛棒材晶粒度的影响", 中国钛业, no. 02, 15 May 2018 (2018-05-15) * |
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