CN114602971B - Production process of pure titanium ingot one-fire forming material - Google Patents
Production process of pure titanium ingot one-fire forming material Download PDFInfo
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- CN114602971B CN114602971B CN202210348644.4A CN202210348644A CN114602971B CN 114602971 B CN114602971 B CN 114602971B CN 202210348644 A CN202210348644 A CN 202210348644A CN 114602971 B CN114602971 B CN 114602971B
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000010936 titanium Substances 0.000 title claims abstract description 81
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 81
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 36
- 238000002791 soaking Methods 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 17
- 239000002436 steel type Substances 0.000 claims abstract description 12
- 238000010304 firing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 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
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000005496 tempering Methods 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 pure titanium ingot one-fire forming material, which comprises the following steps that a, a track is paved on the bottom of a push steel type heating furnace, the track consists of a plurality of continuous casting billets, a clamp is arranged on each continuous casting billet, b, the push steel type heating furnace carries out heat treatment on a titanium round ingot made of TA1 material, the titanium round ingot passes through the push steel type heating furnace along the track and is sequentially preheated, heated and soaked, the preheating temperature is 650-750 ℃, the heating temperature is 1000-1030 ℃, the soaking temperature is 980-1010 ℃, c, the heated titanium round ingot is rolled into billets, the cogging pass is carried out 19-30 times, a blank body of the titanium billets is obtained, d, two end heads of the blank body are cut, the titanium billets are obtained, e, the titanium billets are continuously rolled into bars, and the temperature of the titanium billets is 700-800 ℃ before continuous rolling. The invention has the advantages of high production efficiency, low production cost and high production yield, and also has the advantage of good mechanical properties of the obtained bar.
Description
Technical Field
The invention belongs to the field of pure titanium bar production processes, and particularly relates to a production process of pure titanium ingot one-fire forming.
Background
The existing bar production process of industrial pure titanium (TA 1) comprises the following steps: firstly, casting into a titanium round ingot through a vacuum consumable furnace; heating and forging the titanium ingot into a titanium square billet with a certain size for many times, wherein the heating must be performed in a kiln type heating furnace due to low ignition point of titanium, the titanium ingot is forged and pressed into the square billet only by many times due to large volume of the titanium ingot, and the titanium square billet with the composite requirement can be obtained only by repeatedly tempering the titanium square billet in the kiln type heating furnace after each forging; and then the titanium square billet is heated and rolled into a bar. The existing pure titanium bar production process has the defects of low production efficiency and high production cost due to longer production flow, and certain loss is generated when the titanium round ingot is forged each time, wherein the loss comprises oxidation loss of materials, the shape of a blank body formed after each forging time is possibly irregular, the grinding loss is caused by further cooling and grinding, and the production yield is low (the yield is 84-87%) due to accumulation of multiple losses. Therefore, the existing pure titanium bar production process 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 pure titanium ingot one-fire forming materials. The invention has the advantages of high production efficiency, low production cost and high production yield, and also has the advantage of good mechanical properties of the obtained bar.
The technical scheme of the invention is as follows: a production process of pure titanium ingot by one-fire forming comprises the following steps,
A. a rail is paved at the bottom of the push steel type heating furnace, the rail consists of a plurality of continuous casting billets made of heat-resistant stainless steel materials, a clamp for guiding the movement of materials is arranged on the continuous casting billets,
B. The push steel type heating furnace carries out heat treatment on the titanium round ingot made of TA1 material, the titanium round ingot passes through the push steel type heating furnace along the track and is sequentially preheated, heated and soaked, the preheating temperature is 650-750 ℃, the heating temperature is 1000-1030 ℃, and the soaking temperature is 980-1010 ℃.
C. rolling the titanium round ingot subjected to heat treatment into square billets by a cogging machine, cogging for 19-30 times to obtain a green body of the titanium square billets,
D. cutting off the end heads at two ends of the blank body to obtain a titanium square blank,
E. Continuously rolling the titanium square billet into bars by using a continuous rolling mill, wherein the temperature of the titanium square billet before continuous rolling is 700-800 ℃ and the final rolling temperature is 680-780 ℃.
In the above-mentioned production process of pure titanium ingot one-firing material, in the step a, the material of the heat-resistant stainless steel is 310S.
In the above-mentioned production process of pure titanium ingot by one fire, 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 1.0-1.5h.
In the above-mentioned production process of pure titanium ingot by one-firing, in the step b, the soaking temperature in the step b is 1000 ℃.
In the production process of the pure titanium ingot one-firing material, in the step c, the cogging passes are 23 to 25 times.
In the production process of the pure titanium ingot one-firing material, in the step d, the cutting length of the end head is 30-50cm.
In the foregoing production process of pure titanium ingot 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 invention utilizes the fact that the titanium round steel is placed into the steel pushing type heating furnace for heating, firstly, the problem that the titanium round steel rubs against the steel tube to cause spontaneous combustion when moving in the steel pushing type heating furnace needs to be solved. And then rolling the heated round titanium steel into square billets in multiple passes by using a cogging machine, rolling the square billets into bars by using a continuous rolling mill, wherein the round titanium steel does not need to be tempered repeatedly in the process of making the round titanium steel into square billets, so that one-fire forming is realized, the production flow is shortened, the production efficiency is improved, the production cost is reduced, the loss during rolling is small, and the yield is improved. The method further reduces the generation of hot cracks on the surface of the square billet, reduces the unilateral peeling amount of the finished product, further improves the yield and achieves 97 percent by controlling the heating parameters of the titanium round ingot and controlling the process in the rolling process of a cogging mill. 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 also has the advantage of good mechanical properties of the obtained bar.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to be limiting.
Example 1 (best mode). A production process of pure titanium ingot by one-fire forming comprises the following steps,
A. the rail is paved at the bottom of the push steel type heating furnace and consists of a plurality of continuous casting billets made of 310S materials, clamps for guiding the movement of materials are arranged on the continuous casting billets, the clamps are square and are placed on two sides of a material moving path and used for preventing titanium round ingots from rolling when moving. The continuous casting square billet is made of metals with different materials, and is subjected to a comparison test, firstly, the titanium round ingot is ensured not to be spontaneously burned when moving on the continuous casting square billet, secondly, the continuous casting square billet is ensured to be good in heat resistance, difficult to oxidize in the heating process, good in wear resistance, difficult to generate oxide skin on the surface, difficult to fall off on the titanium round ingot to cause pollution of the titanium round ingot, the bar obtained by production is ensured to meet the requirements, and the comparison result finds that 310S meets the requirements.
B. The push steel type heating furnace carries out heat treatment on the titanium round ingot made of TA1 material, the titanium round ingot passes through the push steel type heating furnace along the 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 heat treatment into square billets by a 750 cogging machine, cogging for 24 times, feeding the titanium round ingot into a finish rolling temperature of 815 ℃, and a final rolling temperature of 790 ℃ to obtain a blank of the titanium square billets,
D. cutting off the ends of the two ends of the blank, wherein the cutting-off length of the ends is 30-50cm, the specific cutting-off length is determined according to the defect length of the two ends of the blank, but the actual cutting-out length range is necessarily within the interval of 30-50cm, and the titanium square blank is obtained.
E. And continuously rolling the titanium square billet into a bar by using a continuous rolling mill, wherein the rolling pass is 6 times, the continuous rolling temperature is 750 ℃, and the final rolling temperature is 730 ℃.
In the step b, the time of the preheating treatment is 2h, the time of the heating treatment is 1.25h, and the time of the soaking treatment is 1.25h.
In the step a, a plurality of continuous casting billets are paved along the advancing direction of the materials, and the continuous casting billets are perpendicular to the advancing direction of the materials.
The size specification phi of the titanium round ingot is 480 x 2000mm, the weight is 1.5-1.6 tons, and the produced bar specification phi is 91.5mm. The steel pushing type heating furnace is the existing equipment, the length of the furnace body is 35 meters, the width of the furnace body is 4.5 meters, 5 heating areas capable of independently regulating temperature are arranged in total according to the advancing direction of materials, the preheating section, the heating end 1, the heating end 2, the heating end 3 and the soaking section are sequentially arranged, and the heating end 1, the heating end 2, the heating end 3 and the soaking section are all provided with upper and lower type burners.
Example 2. Compared with example 1, the difference is that: in the step b, the preheating temperature is 650 ℃, the preheating time is 2.5 hours, the heating temperature is 1000 ℃, the heating time is 1.5 hours, the soaking temperature is 980 ℃, and the soaking time is 1.5 hours; in the step c, the cogging pass is carried out 23 times, the temperature of the finish rolling of the titanium round ingot is 800 ℃, and the final 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, the preheating temperature is 750 ℃, the preheating time is 1.5h, the heating temperature is 1030 ℃, the heating time is 1h, and the soaking temperature is 1010 ℃ and the soaking time is 1h; in the step c, the cogging pass is performed 25 times, the temperature of the finish rolling of the titanium round ingot is 830 ℃, and the final rolling temperature of the titanium round ingot is 800 ℃; in the step e, the inlet continuous rolling temperature is 800 ℃ and the final rolling temperature is 780 ℃.
Example 4. Compared with example 1, the difference is that the soaking temperature is adjusted to 965 ℃, and compared with the soaking temperature of example 1, the hardness of the titanium round ingot after being discharged out of the furnace is correspondingly higher, so that the cogging pass in the step c is correspondingly improved to 28 times, the deformation amount of cogging each time is reduced, and cogging defects are avoided as much as possible. As the temperature of the titanium round ingot discharged from the furnace is reduced, the corresponding temperature of the titanium round ingot in and out is reduced to about 790 ℃, and the final temperature of the titanium round ingot is about 770 ℃.
Example 5. Compared with example 1, the difference is that the soaking temperature is adjusted to 1025 ℃, and compared with the soaking temperature in example 1, the hardness of the titanium round ingot after being discharged from the furnace is correspondingly lower, so that the cogging pass in the step c is correspondingly reduced to 20 times, and the production efficiency is improved. As the temperature of the titanium round ingot discharged from the furnace increases, the corresponding temperature of the titanium round ingot in and out finish rolling increases to about 845 ℃ and the temperature of the titanium round ingot finish rolling increases to about 815 ℃.
Table 1 shows the comparison of examples 1, 4 and 5.
TABLE 1
As can be seen from table 1, the different soaking temperatures have a large influence on the finishing temperature, and the transformation temperature of titanium is about 800 ℃, so that the plasticity of the material is deteriorated due to the excessively high or excessively low transformation temperature, and the defect lengths at the head and tail ends and the surface defect depth are directly influenced. As can be seen from the three schemes of comparative examples 1, 4 and 5, the scheme of example 1 is best, the yield can reach 97%, the single-side peeling amount is minimum, and the surface quality is best.
Table 2 shows the comparison of the bars obtained in examples 1, 4, 5 with the parameters required by the current national standards.
TABLE 2
As can be seen from Table 2, the bars of example 4 have low finishing temperatures, and high yield strength due to the large number of rolling passes, but the low elongation may not meet the national standard. In embodiment 5, the rolling pass is small, the finishing rolling temperature is high, the finish rolling temperature is high, and the elongation is high, but the yield strength may not meet the national standard. The bar of the embodiment 1 achieves all parameter indexes and is far beyond the national standard requirements, so the bar has good mechanical properties.
Claims (5)
1. A production process of pure titanium ingot one-firing material is characterized in that: comprises the steps of,
A. a rail is paved at the bottom of the push steel type heating furnace, the rail consists of a plurality of continuous casting billets made of heat-resistant stainless steel materials, a clamp for guiding the movement of materials is arranged on the continuous casting billets,
B. The push steel type heating furnace carries out heat treatment on the titanium round ingot made of TA1 material, the titanium round ingot passes through the push steel type heating furnace along the track and is sequentially preheated, heated and soaked at the preheating temperature of 650-750 ℃, the heating temperature of 1000-1030 ℃ and the soaking temperature of 1000 ℃,
C. Rolling the titanium round ingot subjected to heat treatment into square billets by a cogging machine, cogging the square billets for 23 to 25 times to obtain a green body of the titanium square billets,
D. cutting off the end heads at 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 700-800 ℃ before continuous rolling.
2. The process for producing pure titanium ingot one-firing material according to claim 1, wherein: in the step a, the heat-resistant stainless steel is 310S.
3. The process for producing pure titanium ingot one-firing material 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 1.0-1.5h.
4. The process for producing pure titanium ingot one-firing material according to claim 1, wherein: in the step d, the cutting length of the end head is 30-50cm.
5. The process for producing pure titanium ingot one-firing material according to claim 1, wherein: in the step a, a plurality of continuous casting billets are paved along the advancing direction of the materials, and the continuous casting billets are perpendicular to the advancing direction of the materials.
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Citations (2)
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| 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 |
| 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 |
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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 |
| JP2708277B2 (en) * | 1991-01-14 | 1998-02-04 | 株式会社神戸製鋼所 | Method for producing hot rolled titanium alloy bar with excellent forgeability as rolled |
| CN1283813C (en) * | 2004-11-22 | 2006-11-08 | 宝钢集团上海五钢有限公司 | Method for heating titanium and titanium alloy ingot |
| CN100455368C (en) * | 2006-06-06 | 2009-01-28 | 厦门虹鹭钨钼工业有限公司 | Method for rolling pure titanium rod and wire |
| CN104148382B (en) * | 2014-07-21 | 2016-03-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot continuous rolling produces the method for titanium or titanium alloy bar |
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| CN105750328B (en) * | 2016-04-06 | 2018-01-30 | 西安赛特思迈钛业有限公司 | A kind of titanium or titanium alloy small-sized bar continuous rolling processing method |
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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 |
| CN114178310B (en) * | 2021-12-02 | 2023-12-22 | 昆明理工大学 | Method for rolling titanium alloy rod and wire by adopting multiple passes |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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