CN112808770A - Rapid switching method for steel and titanium rolling - Google Patents
Rapid switching method for steel and titanium rolling Download PDFInfo
- Publication number
- CN112808770A CN112808770A CN202011601758.2A CN202011601758A CN112808770A CN 112808770 A CN112808770 A CN 112808770A CN 202011601758 A CN202011601758 A CN 202011601758A CN 112808770 A CN112808770 A CN 112808770A
- Authority
- CN
- China
- Prior art keywords
- billet
- rolling
- titanium
- heating furnace
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 179
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 171
- 239000010936 titanium Substances 0.000 title claims abstract description 171
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 170
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 151
- 238000004519 manufacturing process Methods 0.000 claims abstract description 52
- 238000005098 hot rolling Methods 0.000 claims abstract description 37
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 13
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 9
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 27
- 229910052799 carbon Inorganic materials 0.000 description 27
- 229910000746 Structural steel Inorganic materials 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000010079 rubber tapping Methods 0.000 description 7
- 230000033764 rhythmic process Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/022—Blooms or billets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/005—Copper or its alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
Abstract
The invention provides a method for rapidly switching steel and titanium rolling, which comprises the following steps: (1) loading a billet of a rolling unit into a first heating furnace; (2) loading the titanium billet of one rolling unit into a second heating furnace; (3) after the last billet in the heated rolling unit is extracted from the first heating furnace and rolled, the first titanium billet in the heated rolling unit is extracted from the second heating furnace and rolled on the same hot rolling production line; (4) after the last titanium slab in one heated rolling unit is extracted from the second heating furnace and rolled, the first slab in the next heated rolling unit is extracted from the first heating furnace and rolled on the same hot rolling line. The method of the invention obviously improves the yield and the production efficiency when the hot rolled steel strip and the hot rolled titanium strip are produced on the same hot rolling production line, avoids the phenomenon of energy waste caused by long rolling switching time and reduces the production cost.
Description
Technical Field
The invention belongs to the technical field of alloy rolling, and particularly relates to a rolling fast switching technology for producing a hot-rolled steel strip and a hot-rolled titanium strip on the same hot-rolling production line.
Background
Titanium and titanium alloy have the characteristics of high specific strength, corrosion resistance, high temperature resistance, low temperature resistance, no magnetism, no toxicity and the like, are widely applied to the fields of aviation, aerospace, oceans, petroleum, chemical industry, metallurgy, electric power, building, medical treatment, sports and the like, and are called space metal, marine metal and strategic metal. The hot-rolled titanium belt is an important titanium product, and the problems of high one-time investment, low equipment utilization rate and the like exist in the newly-built special production line for producing the hot-rolled titanium belt. The hot-rolled titanium strip produced by the existing hot-rolled steel strip production line of the iron and steel enterprise has the remarkable advantages of good product quality, high production efficiency, low production cost and the like, and is the development direction of the hot-rolled titanium strip manufacturing technology.
The physical and chemical properties of titanium and steel are quite different, which causes the heating process of titanium billet and steel billet in the hot rolling production to have obvious difference, and the tapping temperature of the titanium billet is about 400 ℃ lower than that of the steel billet. Before the technology of the invention is implemented, in the process of producing the hot rolled steel strip and the hot rolled titanium strip on the same hot rolling production line, the steel billet and the titanium billet are heated in the same heating furnace, and the mode of switching the hot rolled steel strip rolling to the hot rolled titanium strip rolling is as follows: firstly, steel billets in a heating furnace are evacuated, then the temperature of the heating furnace is slowly reduced to the target heating temperature of the titanium billets at the cooling rate of less than or equal to 40 ℃/hour, the titanium billets are taken out of the furnace and rolled into titanium strips after being heated for about 5 hours, and the switching time from steel rolling to titanium rolling is more than or equal to 15 hours; the mode of switching from hot rolling titanium strip rolling to hot rolling steel strip rolling is as follows: firstly, evacuating the titanium blank in the heating furnace, slowly raising the temperature of the heating furnace to the target heating temperature of the steel blank at the temperature rise rate of less than or equal to 40 ℃/hour, discharging the steel blank out of the furnace after the steel blank is charged into the furnace and heated for about 3 hours, and switching the time from titanium rolling to steel rolling for more than or equal to 13 hours. The rolling switching time required by implementing the steel and titanium rolling switching technology is too long, so that the rolling line yield and the production efficiency are greatly reduced, a large amount of fuel gas is wasted, and the production cost is increased.
Therefore, there is a need in the art to develop a steel and titanium rolling switching technology with short switching time, so as to significantly improve the yield and production efficiency of hot rolled steel strips and hot rolled titanium strips produced on the same hot rolling line, save energy, and reduce production cost.
Disclosure of Invention
Aiming at the problem that the steel rolling and titanium rolling switching time is too long before the technology is implemented, the invention provides a billet and titanium billet rolling switching method.
The invention realizes the above purposes by the following technical scheme:
a method for rolling and switching a steel billet and a titanium billet comprises the following steps:
(1) loading a billet of a rolling unit into a first heating furnace;
(2) loading the titanium billet of one rolling unit into a second heating furnace;
(3) extracting the last one of the heated steel billets of the one rolling unit from the first heating furnace and rolling, and then extracting the first one of the heated titanium billets of the one rolling unit from the second heating furnace and rolling on the same hot rolling production line;
(4) and after the last one of the heated titanium billets of the one rolling unit is extracted from the second heating furnace and rolled, the first one of the heated billets of the next rolling unit is extracted from the first heating furnace and rolled on the same hot rolling production line.
Optionally, in the steps (3) and (4), the last billet in the billets of the rolling unit and the first billet in the titanium billets of the rolling unit are extracted from the first heating furnace, or the last billet in the titanium billets of the rolling unit and the first billet in the billets of the next rolling unit are extracted from the second heating furnace according to the interval time of 2-6 minutes.
Optionally, the hot rolling line is a hot continuous rolling mill, a steckel mill or a thin slab continuous casting and rolling line.
Optionally, the steel billet is a non-alloy steel billet, a low alloy steel billet, or an alloy steel billet.
Optionally, the steel slab is a bloom or a continuous casting.
Optionally, the titanium billet is an industrially pure titanium billet or a titanium alloy billet.
Optionally, the commercially pure titanium billet is a commercially pure titanium billet having a designation TA0, TAl, TA2, or TA 3.
Optionally, the titanium alloy billet is a titanium alloy billet with a designation TA10, TA18, or TC 4.
Optionally, the titanium billet is a forged titanium billet or a titanium billet produced with an electron beam cold hearth furnace.
Optionally, the first heating furnace is a pusher-type heating furnace or a walking-beam type heating furnace; the second heating furnace is a pusher-type heating furnace, a stepping heating furnace, a trolley-type heating furnace or a roller-hearth heating furnace.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention relates to a rapid switching technology between steel rolling and titanium rolling when hot rolled steel strips and hot rolled titanium strips are produced on the same hot rolling production line, the rolling switching time is short, and the actual rolling switching time is close to the rolling intermittent time between adjacent hot rolled steel strips or the rolling intermittent time between adjacent hot rolled titanium strips. When the hot rolled steel strip and the hot rolled titanium strip are produced on the same hot rolling production line by adopting the prior art, the steel and titanium rolling switching time is more than or equal to 13 hours; when the method of the invention is adopted to produce the hot rolled steel strip and the hot rolled titanium strip on the same hot rolling production line, the steel and titanium rolling switching time is 2 minutes to 6 minutes. Therefore, the invention obviously shortens the steel and titanium rolling switching time when the hot rolled steel strip and the hot rolled titanium strip are produced on the same hot rolling production line.
The invention obviously improves the yield and the production efficiency when the hot rolled steel strip and the hot rolled titanium strip are produced on the same hot rolling production line, avoids the phenomenon of energy waste caused by long rolling switching time and reduces the production cost.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
In order to solve the problem caused by the overlong rolling switching time when a hot-rolled steel strip and a hot-rolled titanium strip are produced on the same hot-rolling production line, the inventor of the invention creatively provides a billet and titanium billet rolling switching method through research.
Specifically, the method for switching rolling of the steel billet and the titanium billet comprises the following steps:
(1) a billet of one rolling unit is charged into a first heating furnace.
In the present invention, the billet of one rolling unit is the billet rolled between the upper and lower working rolls of each rolling mill of the finishing mill group, and consists of 30 to 40 billets. The steel billet is a non-alloy steel billet, a low-alloy steel billet or an alloy steel billet which is suitable for hot rolling production, and the heating systems of the non-alloy steel billet, the low-alloy steel billet or the alloy steel billet are the same or similar. The steel billet is a bloom or a continuous casting billet.
In the present invention, the first heating furnace is a pusher-type heating furnace or a walking beam type heating furnace suitable for heating a billet.
(2) The titanium billet of one rolling unit is charged into a second heating furnace.
In the present invention, the titanium billet of one rolling unit is the titanium billet rolled between the upper working roll and the lower working roll of each rolling mill of the replacement finishing mill group, and consists of 20 to 30 titanium billets. The titanium billet is an industrial pure titanium billet or a titanium alloy billet which is suitable for hot rolling production, and the heating systems of the titanium billet and the titanium alloy billet are the same or similar. Wherein the industrial pure titanium billet is, for example, an industrial pure titanium billet with the brand number of TA0, TAl, TA2 or TA 3; the titanium alloy billet is, for example, a titanium alloy billet of the brand numbers TA10, TA18 or TC 4.
In the present invention, the titanium billet is a forged titanium billet or a titanium billet produced with an electron beam cold hearth furnace (i.e., an EB billet).
In the present invention, the second heating furnace is a pusher-type heating furnace, a walking-type heating furnace, a car-type heating furnace or a roller hearth-type heating furnace suitable for heating the titanium slab.
It should be noted that the steps (1) and (2) may be performed simultaneously, sequentially or after the step (2) and then the step (1) are performed, as long as the requirements of the subsequent steps (3) and (4) on the extraction of the billet and the titanium billet from the first heating furnace and the second heating furnace can be satisfied. The skilled person can select the desired one according to the actual need. In addition, the above steps (1) and (2) may be repeated to continuously roll the billet and the titanium billet, for example, after the billet of one rolling unit is loaded into the first heating furnace, after all the billets of the rolling unit are extracted from the first heating furnace, the billet of the next rolling unit may be loaded into the first heating furnace; similarly, after the titanium billet of one rolling unit is charged into the second heating furnace, after the titanium billet of the rolling unit is completely extracted from the second heating furnace, the titanium billet of the next rolling unit can be charged into the second heating furnace. In this way, continuous rolling of the billet and the titanium billet can be achieved.
In the steps (1) and (2), the rhythm of loading the billet into the first heating furnace and loading the titanium billet into the second heating furnace may satisfy the requirements of the subsequent steps (3) and (4) for extracting the billet and the titanium billet from the first heating furnace and the second heating furnace. The skilled person can select the desired one according to the actual need.
It should be noted that the numbers of the heating furnaces, i.e., "the first heating furnace" and "the second heating furnace", are only used to distinguish the heating of the billet and the titanium billet in different heating furnaces, and do not limit the sequence or importance of the heating furnaces.
(3) After the last billet in the heated rolling unit is extracted from the first heating furnace and rolled, the first titanium billet in the heated rolling unit is extracted from the second heating furnace and rolled on the same hot rolling production line;
(4) after the last titanium slab in one heated rolling unit is extracted from the second heating furnace and rolled, the first slab in the next heated rolling unit is extracted from the first heating furnace and rolled on the same hot rolling line.
In the present invention, the last slab in one rolling unit and the first slab in one rolling unit are extracted from the first heating furnace and the second heating furnace at intervals of 2 to 6 minutes, or the last slab in one rolling unit and the first slab in the next rolling unit are extracted from the second heating furnace and the first slab in the next rolling unit are extracted from the first heating furnace. Namely, after the last billet in one rolling unit in the first heating furnace is heated and discharged for rolling for 2 minutes to 6 minutes, the first titanium billet in the heated rolling unit in the second heating furnace is directly discharged for rolling, namely the switching time from the rolling of the billet to the rolling of the titanium billet is 2 minutes to 6 minutes. Or when the last titanium billet in one rolling unit in the second heating furnace is heated and discharged for rolling for 2 to 6 minutes, directly discharging and rolling the first billet in the next rolling unit which is heated in the first heating furnace, namely, the switching time from the titanium billet rolling to the billet rolling is 2 to 6 minutes.
On the premise that the heating capacity of the heating furnace is allowed and the quality of the hot rolled steel strip and the hot rolled titanium strip meets the requirements, the shortest steel and titanium rolling switching time is selected to achieve the purposes of the highest yield and the highest production efficiency of a hot rolling production line. In the invention, the capacity of the first heating furnace for heating the steel billet is 260 tons/hour, the capacity of the second heating furnace for heating the titanium billet is 160 tons/hour, and the quality of the hot-rolled steel strip meets the following standard requirements: GB/T709 'size, appearance, weight and allowable deviation of hot rolled steel plate and strip' and GB/T14977 'general requirements for surface quality of hot rolled steel plate', the quality of the hot rolled titanium strip meets the following standard requirements: GB/T3621 "titanium and titanium alloy plate", under the above-mentioned prerequisite, select steel and titanium rolling switching time to be 2 minutes to 6 minutes, can make hot rolling production line output and production efficiency the highest.
In the present invention, the hot rolling line means a conventional hot continuous rolling mill, steckel mill or thin slab continuous casting and rolling line suitable for the production of hot rolled steel strip and hot rolled titanium strip.
In the present invention, the steel slab and the titanium slab may be rolled by a conventional rolling process system, for example, a process system including descaling, rough rolling, finish rolling, and coiling.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
In this example, Q235A carbon structural steel hot rolled steel strip and TAl industrial pure titanium hot rolled titanium strip were produced on the same 1549mm conventional hot continuous rolling line.
The Q235A carbon structural steel billet is a continuous casting billet suitable for hot rolling production, and has the specification (thickness, width and length) of 230 multiplied by 1260 multiplied by 9600 (mm); the titanium slab of the TAl industrial purity is a titanium slab (EB slab) produced by an electron beam cold hearth furnace suitable for hot rolling production, and has a specification (thickness. times. width. times. length) of 205. times.1235. times.7968 (mm).
The first and second heating furnaces on 1549mm traditional hot continuous rolling production line are both walking beam furnaces.
The method of the embodiment specifically comprises the following steps:
a billet of Q235A carbon structural steel of one rolling unit (consisting of 30 billets) was collectively charged into a first heating furnace, while a TAl industrial pure titanium billet of one rolling unit (consisting of 30 titanium billets) was collectively charged into a second heating furnace according to the production rhythm.
Heating the Q235A carbon structural steel billet loaded into the first heating furnace according to the heating schedule of the table 1, wherein the tapping temperature is 1250 ℃, and the standing time is 3 hours; the TAl industrial pure titanium billet loaded into the second heating furnace was heated according to the heating schedule of Table 1, the tapping temperature was 830 ℃, and the standing time was 5 hours.
After the last Q235A steel billet in one rolling unit in the first heating furnace is heated and discharged for rolling for 2 minutes, the first TAl titanium billet in the heated rolling unit in the second heating furnace is directly discharged for rolling, namely the switching time from the rolling of the Q235A carbon structural steel billet to the rolling of the TAl industrial pure titanium billet is 2 minutes.
Wherein, according to the process schedule of descaling, rough rolling, finish rolling, coiling and the like of the hot rolled steel strip of the table 2, the Q235A carbon constructional steel billet is rolled into the steel strip, and the specification (thickness, width and length) of the finished product is 3.0 multiplied by 1250 multiplied by coils (mm); the tai titanium slab was rolled into a titanium strip according to the process schedule of rough rolling, finish rolling, coiling, etc. of the hot rolled titanium strip of table 2, with the finished specification (thickness × width × length) of 5.0 × 1235 × coils (mm).
Example 2
In this example, a TAl industrial pure titanium hot rolled titanium strip and a Q235A carbon structural steel hot rolled steel strip were produced on the same 1549mm conventional hot continuous rolling line.
The TAl industrial pure titanium blank is a titanium blank (EB blank) which is suitable for hot rolling production and is produced by an electron beam cold bed furnace, and the specification (thickness multiplied by width multiplied by length) is 206 multiplied by 1235 multiplied by 8016 (mm); the Q235A carbon structural steel slab is a continuous casting slab suitable for hot rolling production, and has a specification (thickness. times. width. times. length) of 230. times.1260. times.9600 (mm).
The first and second heating furnaces on 1549mm traditional hot continuous rolling production line are both walking beam furnaces.
The method of the embodiment specifically comprises the following steps:
the tai commercial pure titanium billets of one rolling unit (consisting of 28 titanium billets) were collectively charged into the second heating furnace, while the Q235A carbon structural steel billets of one rolling unit (consisting of 32 billets) were collectively charged into the first heating furnace according to the production rhythm.
Heating the TAl industrial pure titanium blank loaded into the second heating furnace according to the heating schedule of the table 1, wherein the discharging temperature is 830 ℃, and the standing time is 5 hours; a billet of Q235A carbon structural steel charged in the first heating furnace was heated according to the heating schedule of Table 1 at a tapping temperature of 1250 ℃ for a residence time of 3 hours.
After the last TAl industrial pure titanium billet in one rolling unit in the second heating furnace is heated and discharged for rolling for 2.5 minutes, the first Q235A carbon structural steel billet in the heated rolling unit in the first heating furnace is directly discharged for rolling, namely the switching time from the TAl industrial pure titanium billet rolling to the Q235A carbon structural steel billet rolling is 2.5 minutes.
Wherein, the TAl titanium blank is rolled into the titanium strip according to the process system of rough rolling, finish rolling, coiling and the like of the hot-rolled titanium strip shown in the table 2, and the finished product specification (thickness multiplied by width multiplied by length) is 6.0 multiplied by 1235 multiplied by coil (mm); a Q235A carbon structural steel slab was rolled into steel strips according to the process schedule of descaling, roughing, finish rolling, coiling, etc. of the hot rolled steel strips of Table 2, the finished specifications (thickness. times. width. times. length) being 3.0. times.1250. times.coils (mm)
Example 3
In the embodiment, the Q355A carbon structural steel hot rolled steel strip and the TA2 industrial pure titanium hot rolled titanium strip are produced on the same 2250mm traditional hot continuous rolling production line.
The Q355A carbon structural steel billet is a continuous casting billet suitable for hot rolling production, and has the specification (thickness, width and length) of 230 multiplied by 2130 multiplied by 9800 (mm); the TA2 industrial pure titanium billet is a forged titanium billet suitable for hot rolling production, and the specification (thickness. times. width. times. length) is 180X 1925X 6510 (mm).
2250mm the first and second heating furnaces of the traditional hot continuous rolling line are all step-by-step heating furnaces.
The method of the embodiment specifically comprises the following steps:
a Q355A carbon structural steel billet of one rolling unit (consisting of 35 billets) was collectively charged into a first heating furnace, while a TA2 commercial pure titanium billet of one rolling unit (consisting of 25 titanium billets) was collectively charged into a second heating furnace according to a predetermined production rhythm.
Heating the Q355A carbon structural steel billet loaded into the first heating furnace according to the billet heating schedule of the table 1, wherein the tapping temperature is 1250 ℃, and the standing time is 3 hours; the commercially pure titanium billet TA2 charged into the second heating furnace was heated according to the titanium billet heating schedule of Table 1, the tapping temperature was 830 ℃, and the residence time was 5 hours.
After the last Q355A carbon structural steel billet in one rolling unit in the first heating furnace is heated and discharged for rolling for 3 minutes, the first TA2 industrial pure titanium billet in the heated rolling unit in the second heating furnace is directly discharged for rolling, namely the switching time from the rolling of the Q355A carbon structural steel billet to the rolling of the TA2 industrial pure titanium billet is 3 minutes.
Wherein, the Q355A carbon constructional steel billet is rolled into steel strip according to the process schedule of descaling, rough rolling, finish rolling, coiling and the like of the hot rolled steel strip in the table 2, and the finished specification (thickness multiplied by width multiplied by length) is 25.0 multiplied by 2100 multiplied by coil (mm); the TA2 titanium slab was rolled into a titanium strip according to the process schedule of rough rolling, finish rolling, coiling, etc. of the hot rolled titanium strip of table 2, with the finished gauge (thickness × width × length) of 8.0 × 1925 × coils (mm).
Example 4
In the embodiment, the TA2 industrial pure titanium hot-rolled titanium strip and the Q355A carbon structural steel hot-rolled steel strip are produced on the same 2250mm traditional hot continuous rolling production line.
The TA2 industrial pure titanium billet is a forged titanium billet suitable for hot rolling production, and the specification (thickness multiplied by width multiplied by length) is 180 multiplied by 1930 multiplied by 6523 (mm); the Q355A carbon structural steel slab is a continuous casting slab suitable for hot rolling production, and has the specification (thickness. times. width. times. length) of 230. times. 2130. times. 9800 (mm).
2250mm the first and second heating furnaces of the traditional hot continuous rolling line are all step-by-step heating furnaces.
The method of the embodiment specifically comprises the following steps:
a TA2 commercial pure titanium billet of one rolling unit (consisting of 20 titanium billets) was collectively charged into the second heating furnace, while a Q355A carbon structural steel billet of one rolling unit (consisting of 40 billets) was collectively charged into the first heating furnace according to a predetermined production rhythm.
Heating the TA2 industrial pure titanium blank filled into the second heating furnace according to the titanium blank heating schedule in the table 1, wherein the discharging temperature is 830 ℃, and the standing time is 5 hours; a Q355A carbon structural steel billet charged into the first heating furnace was heated according to the billet heating schedule of Table 1, the tapping temperature was 1250 ℃, and the residence time was 3 hours.
After the last TA2 industrial pure titanium billet in one rolling unit in the second heating furnace is heated and discharged for rolling for 6 minutes, the first Q355A carbon structural steel billet in the heated rolling unit in the first heating furnace is directly discharged for rolling, namely the switching time from the TA2 industrial pure titanium billet to the Q355A carbon structural steel billet is 6 minutes.
Wherein, TA2 titanium billet is rolled into titanium strip according to the process system of rough rolling, finish rolling, coiling and the like of the hot rolling titanium strip in the table 2, and the finished product specification (thickness multiplied by width multiplied by length) is 6.0 multiplied by 1930 multiplied by coil (mm); the Q355A carbon structural steel slab was rolled into steel strip having a finished specification (thickness. times. width. times. length) of 25.0. times.2100. times.coils (mm) according to the process schedule of descaling, rough rolling, finish rolling, coiling, etc. of the hot rolled steel strip shown in Table 2.
TABLE 1 charging mode, heating schedule, rolling switching mode and switching time of billet and titanium billet
TABLE 2 Rolling Process and finished product Specifications of Hot rolled Steel strip, Hot rolled titanium strip
Comparative example 1
Comparative example 1 the same steel slab and titanium slab were used as in example 1, and the heating system and rolling system of the steel slab and titanium slab were the same as in example 1. The difference lies in that:
comparative example 1 the method is:
a billet of a rolling unit (consisting of 30 billets) is loaded into a first heating furnace;
evacuating the steel billet in the first heating furnace;
slowly reducing the temperature of the first heating furnace from 1250 ℃ to 830 ℃ for 10 hours;
titanium billets of one rolling unit (consisting of 30 titanium billets) are loaded into a first heating furnace and heated for 5 hours, and then discharged from the furnace to roll a titanium strip, so that the switching from steel rolling to titanium rolling is realized.
The switching time for comparative example 1 was 15 hours.
Comparative example 2
Comparative example 2 and example 2 used the same slabs and titanium billets, and the heating schedule and rolling schedule of the slabs and titanium billets were the same as in example 2. The difference lies in that:
comparative example 2 the method was:
titanium billets of one rolling unit (consisting of 28 titanium billets) were charged into a first heating furnace;
evacuating the titanium blank in the first heating furnace;
slowly raising the temperature of the first heating furnace from 830 ℃ to 1250 ℃ for 10 hours;
a steel billet of a rolling unit (consisting of 32 steel billets) is loaded into a first heating furnace and heated for 3 hours, and then is discharged from the furnace to roll a steel strip, so that the switching from titanium rolling to steel rolling is realized.
The switching time for comparative example 2 was 13 hours.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (10)
1. A method for rolling and switching a steel billet and a titanium billet is characterized by comprising the following steps:
(1) loading a billet of a rolling unit into a first heating furnace;
(2) loading the titanium billet of one rolling unit into a second heating furnace;
(3) extracting the last one of the heated steel billets of the one rolling unit from the first heating furnace and rolling, and then extracting the first one of the heated titanium billets of the one rolling unit from the second heating furnace and rolling on the same hot rolling production line;
(4) and after the last one of the heated titanium billets of the one rolling unit is extracted from the second heating furnace and rolled, the first one of the heated billets of the next rolling unit is extracted from the first heating furnace and rolled on the same hot rolling production line.
2. The method for switching between billet and titanium slab rolling according to claim 1, wherein in steps (3) and (4), the last one of the billets of said one rolling unit and the first one of the billets of said one rolling unit are extracted from the first heating furnace and the second heating furnace at intervals of 2 to 6 minutes, or the last one of the billets of said one rolling unit and the first one of the billets of the next rolling unit are extracted from the second heating furnace and the first heating furnace.
3. The method of claim 1, wherein the hot rolling line is a hot continuous rolling mill, a steckel mill, or a thin slab continuous casting and rolling line.
4. The method of claim 1, wherein the billet is a non-alloy steel billet, a low alloy steel billet, or an alloy steel billet.
5. The method for rolling and switching a billet as defined in claim 1, wherein the billet is a bloom or a continuous slab.
6. The method of claim 1, wherein the titanium billet is a commercial purity titanium billet or a titanium alloy billet.
7. The method of claim 6, wherein the commercial purity titanium billet is a commercial purity titanium billet with a designation TA0, TAl, TA2, or TA 3.
8. The method of claim 6, wherein the titanium alloy billet is a titanium alloy billet with a designation TA10, TA18 or TC 4.
9. The method of claim 1, wherein the titanium billet is a forged titanium billet or a titanium billet produced using an electron beam cold hearth furnace.
10. The method for switching between rolling of a steel billet and a titanium billet according to claim 1, wherein the first heating furnace is a pusher-type heating furnace or a walking beam type heating furnace; the second heating furnace is a pusher-type heating furnace, a stepping heating furnace, a trolley-type heating furnace or a roller-hearth heating furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011601758.2A CN112808770A (en) | 2020-12-29 | 2020-12-29 | Rapid switching method for steel and titanium rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011601758.2A CN112808770A (en) | 2020-12-29 | 2020-12-29 | Rapid switching method for steel and titanium rolling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112808770A true CN112808770A (en) | 2021-05-18 |
Family
ID=75855254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011601758.2A Pending CN112808770A (en) | 2020-12-29 | 2020-12-29 | Rapid switching method for steel and titanium rolling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112808770A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857247A (en) * | 2021-10-19 | 2021-12-31 | 攀钢集团攀枝花钢钒有限公司 | Production method of hot continuous rolling titanium alloy plate |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001137907A (en) * | 1999-11-16 | 2001-05-22 | Hitachi Ltd | Hot-rolling method and steckel hot-rolling mill |
| JP2002080931A (en) * | 2000-09-07 | 2002-03-22 | Nippon Steel Corp | High strength cold rolled steel sheet and high strength plated steel sheet having excellent workability and spot weldability and method for producing the same |
| JP2006176840A (en) * | 2004-12-22 | 2006-07-06 | Sumitomo Metal Ind Ltd | Method for manufacturing steel billet |
| JP2009028747A (en) * | 2007-07-26 | 2009-02-12 | Jfe Steel Kk | Method for rolling thick steel plate |
| CN101613838A (en) * | 2009-07-13 | 2009-12-30 | 山西太钢不锈钢股份有限公司 | A kind of niobium-titanium composite micro-alloyed hot rolled steel strip and manufacture method thereof |
| CN202921642U (en) * | 2012-10-19 | 2013-05-08 | 北京首特冶金设备技术有限公司 | Composite steel rolling production line |
| CN103567222A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Hot rolling collinear production line and production process for steel and aluminum alloy plate and strip products |
| CN203541075U (en) * | 2013-10-12 | 2014-04-16 | 酒泉钢铁(集团)有限责任公司 | Collinear hot rolling production line for steel-aluminum alloy plate-strip product |
| CN104588408A (en) * | 2015-01-23 | 2015-05-06 | 武钢集团昆明钢铁股份有限公司 | Heating method for industrial pure-titanium square billet |
| CN105728459A (en) * | 2016-03-02 | 2016-07-06 | 湖南湘投金天钛金属有限公司 | Method for producing TA18 titanium alloy strip coil by means of conventional hot continuous rolling unit |
| CN106475415A (en) * | 2016-10-17 | 2017-03-08 | 攀钢集团攀枝花钢钒有限公司 | The hot continuous rolling method of technical pure titanium or titanium alloy |
| CN110883086A (en) * | 2019-12-12 | 2020-03-17 | 马鞍山钢铁股份有限公司 | Collinear production method of titanium and titanium alloy section and section steel |
-
2020
- 2020-12-29 CN CN202011601758.2A patent/CN112808770A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001137907A (en) * | 1999-11-16 | 2001-05-22 | Hitachi Ltd | Hot-rolling method and steckel hot-rolling mill |
| JP2002080931A (en) * | 2000-09-07 | 2002-03-22 | Nippon Steel Corp | High strength cold rolled steel sheet and high strength plated steel sheet having excellent workability and spot weldability and method for producing the same |
| JP2006176840A (en) * | 2004-12-22 | 2006-07-06 | Sumitomo Metal Ind Ltd | Method for manufacturing steel billet |
| JP2009028747A (en) * | 2007-07-26 | 2009-02-12 | Jfe Steel Kk | Method for rolling thick steel plate |
| CN101613838A (en) * | 2009-07-13 | 2009-12-30 | 山西太钢不锈钢股份有限公司 | A kind of niobium-titanium composite micro-alloyed hot rolled steel strip and manufacture method thereof |
| CN202921642U (en) * | 2012-10-19 | 2013-05-08 | 北京首特冶金设备技术有限公司 | Composite steel rolling production line |
| CN103567222A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Hot rolling collinear production line and production process for steel and aluminum alloy plate and strip products |
| CN203541075U (en) * | 2013-10-12 | 2014-04-16 | 酒泉钢铁(集团)有限责任公司 | Collinear hot rolling production line for steel-aluminum alloy plate-strip product |
| CN104588408A (en) * | 2015-01-23 | 2015-05-06 | 武钢集团昆明钢铁股份有限公司 | Heating method for industrial pure-titanium square billet |
| CN105728459A (en) * | 2016-03-02 | 2016-07-06 | 湖南湘投金天钛金属有限公司 | Method for producing TA18 titanium alloy strip coil by means of conventional hot continuous rolling unit |
| CN106475415A (en) * | 2016-10-17 | 2017-03-08 | 攀钢集团攀枝花钢钒有限公司 | The hot continuous rolling method of technical pure titanium or titanium alloy |
| CN110883086A (en) * | 2019-12-12 | 2020-03-17 | 马鞍山钢铁股份有限公司 | Collinear production method of titanium and titanium alloy section and section steel |
Non-Patent Citations (1)
| Title |
|---|
| 辛建卿等: "1549mm热连轧机生产大卷重宽幅钛带技术开发", 《山西冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857247A (en) * | 2021-10-19 | 2021-12-31 | 攀钢集团攀枝花钢钒有限公司 | Production method of hot continuous rolling titanium alloy plate |
| CN113857247B (en) * | 2021-10-19 | 2023-11-21 | 攀钢集团攀枝花钢钒有限公司 | Production method of hot continuous rolling titanium alloy plate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100567519C (en) | A kind of production technique of the deep-draw level cold-rolled steel sheet based on CSP technology | |
| CN103341498B (en) | Reduce the method for hot rolled steel plate surface oxidation iron sheet thickness | |
| CN102581039A (en) | Method for rolling pure titanium strip | |
| CN108994081B (en) | Method for producing low-carbon steel by ferrite rolling in ESP production line | |
| CN107488815A (en) | A kind of medium temperature orientation silicon steel hot rolled strip and preparation method thereof | |
| CN102059248A (en) | Method for producing titanium coil by using normal hot continuous rolling mill | |
| CN103468907A (en) | Method for producing cold-rolled non-oriented electrical steel based on ASP (AnGang Strip Production) medium thin slab continuous casting and rolling process | |
| CN105032974B (en) | The production method of zirconium and zircaloy band volume | |
| CN107164692B (en) | A method of the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique | |
| CN107201478B (en) | A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology | |
| CN112808770A (en) | Rapid switching method for steel and titanium rolling | |
| CN101353756A (en) | Cold rolling high strength steel plate for porcelain enamel and manufacturing method thereof | |
| CN104087734A (en) | Method for preparing high-performance maraging-steel steel belt | |
| CN113042532B (en) | Bi-containing high magnetic induction oriented silicon steel hot-rolled strip steel edge quality control method | |
| CN112553437B (en) | Method for controlling yield strength fluctuation of 420 MPa-grade hot-galvanized high-strength steel | |
| CN111570509B (en) | Titanium strip rolling method for hot continuous rolling strip steel production line | |
| CN113385537A (en) | Method for directly cold rolling stainless steel without annealing | |
| CN116329280A (en) | Cold rolling and continuous annealing pickling method for wide iron-chromium-aluminum alloy steel coil | |
| CN109127726B (en) | Preparation method of industrial pure titanium plate | |
| CN109182907B (en) | Method for producing semi-process non-oriented electrical steel by endless rolling | |
| CN109338238B (en) | Low-carbon steel for stamping based on thin strip casting and rolling and manufacturing method thereof | |
| CN101333619B (en) | Technological process for controlling secondary recrystallization crystal particle dimension of oriented silicon steel | |
| CN114101372B (en) | High-strength TC18 titanium alloy seamless pipe efficient low-cost preparation method | |
| CN102534364A (en) | Production method capable of improving magnetic property of common grain-oriented silicon steel | |
| CN101590488B (en) | Rolling technical skill of hot strip rough rolling process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210518 |
|
| RJ01 | Rejection of invention patent application after publication |