CN117862285A - Titanium alloy steel processing technology - Google Patents
Titanium alloy steel processing technology Download PDFInfo
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- CN117862285A CN117862285A CN202311804122.1A CN202311804122A CN117862285A CN 117862285 A CN117862285 A CN 117862285A CN 202311804122 A CN202311804122 A CN 202311804122A CN 117862285 A CN117862285 A CN 117862285A
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- titanium alloy
- rolling
- belt
- alloy steel
- heat preservation
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 94
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000005516 engineering process Methods 0.000 title claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 61
- 238000005096 rolling process Methods 0.000 claims abstract description 33
- 238000005452 bending Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims description 19
- 230000006698 induction Effects 0.000 claims description 13
- 230000005674 electromagnetic induction Effects 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000003754 machining Methods 0.000 claims 4
- 238000005336 cracking Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/008—Bending sheet metal along straight lines, e.g. to form simple curves combined with heating or cooling of the bends
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (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 relates to the technical field of titanium alloy processing, and provides a titanium alloy section steel processing technology, which comprises the following steps of S1, hot-rolling a titanium alloy plate blank into a titanium alloy belt; s2, conveying the titanium alloy belt to a heating device through a conveying device, heating the titanium alloy belt to a target temperature, and then entering a cold bending unit; s3, rolling the titanium alloy strip into the section steel by the cold bending unit. The titanium alloy plate blank is directly rolled and formed by entering a cold bending unit after being hot rolled into the titanium alloy strip, so that the rolling and unreeling processes are omitted, the time is greatly saved, and the production efficiency is improved; the heating device is arranged to heat the titanium alloy strip before entering the cold bending unit, so that the internal stress can be eliminated, and the cracking is prevented; the microstructure of the titanium alloy belt can be changed by heating, so that the toughness is improved, the deformation resistance is reduced, the deformation is better born, and the possibility of cracking is reduced.
Description
Technical Field
The invention relates to the technical field of titanium alloy processing, in particular to a titanium alloy steel processing technology.
Background
Because the titanium alloy steel has the advantages of high strength, good corrosion resistance, excellent low-temperature performance and the like, various industries need to be large, and the titanium alloy steel is widely applied to various fields such as aerospace, automobile industry, medical field and the like.
At present, when titanium alloy steel is formed by cold bending, rolling and rolling the rolled titanium alloy coil to a cold bending unit for rolling and forming, and the process has the following defects:
1. the winding and unwinding processes waste a great deal of time, and the production efficiency is reduced;
2. titanium alloy is easy to crack due to fatigue damage when subjected to alternating stress in the cold bending process, and once cracks appear, the expansion speed of the titanium alloy is high, so that the material is easy to break.
Therefore, how to improve the production efficiency and prevent cracking of the titanium alloy in the cold bending process is a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a titanium alloy steel processing technology which solves the defects in the prior art, thereby achieving the purposes of improving the production efficiency and simultaneously preventing the titanium alloy from cracking in the cold bending process.
The embodiment of the invention is realized by the following technical scheme:
a titanium alloy steel processing technology comprises the following steps:
s1, hot rolling a titanium alloy plate blank into a titanium alloy belt;
s2, conveying the titanium alloy belt to a heating device through a conveying device, heating the titanium alloy belt to a target temperature, and then entering a cold bending unit;
s3, rolling the titanium alloy strip into the section steel by the cold bending unit.
Optionally, the heat preservation device includes preheating component and the heat preservation subassembly that sets gradually along titanium alloy area direction of delivery, preheating component with titanium alloy area heating to target temperature, the heat preservation subassembly keeps warm titanium alloy area at target temperature for a certain time.
Optionally, the preheating component comprises a shielding box, and an electromagnetic induction coil and a high-frequency induction heating device which are arranged in the shielding box, wherein the electromagnetic induction coil is connected with the high-frequency induction heating device, and the titanium alloy strip passes through the electromagnetic induction coil.
Optionally, the heat preservation subassembly includes the insulation can, and a plurality of electromagnetic heating roller sets of following titanium alloy area direction of delivery interval setting in the insulation can, electromagnetic heating roller set include lower electromagnetic heating roller and with lower electromagnetic heating roller correspond last electromagnetic heating roller.
Optionally, adjacent electromagnetic heating roller sets are staggered in the height direction.
Optionally, heat preservation device's front end and rear end all are equipped with the mechanism of fixing a width, and the mechanism of fixing a width is including the backup pad that is equipped with titanium alloy area both sides, rotates between two backup pads to be provided with the regulation pole, and the one end of adjusting the pole is equipped with adjust knob, and it has the slider to adjust the screw thread that opposite direction was equipped with at pole both ends and both ends respectively through screw-thread fit, is equipped with the gib block between two backup pads, and the gib block offsets with the bottom of slider, and the top of slider is equipped with the board of fixing a width.
Optionally, a guide roller is rotatably arranged between the upper end and the lower end of the fixed-width plate.
Optionally, the hot rolling process in step S1 includes heating, rough rolling, and 3-6 pass finish rolling in this order.
Optionally, the roll forming process in step S3 includes 6-12 pass rolling.
The invention has at least the following advantages and beneficial effects:
1. according to the invention, the titanium alloy plate blank is directly rolled and formed in the cold bending unit after being hot rolled into the titanium alloy strip, so that the rolling and unreeling processes are omitted, the time is greatly saved, and the production efficiency is improved.
2. In the invention, the self residual temperature of the titanium strip after hot rolling is utilized to carry out deep processing, and the heating device is arranged before entering the cold bending unit to carry out temperature compensation on the titanium alloy strip, thereby reducing the heating process of the titanium strip and reducing the energy consumption. Meanwhile, through thermal deformation, the internal stress can be eliminated, so that cracking is prevented; the microstructure of the titanium alloy strip can be changed by heating, so that the toughness is improved, the deformation resistance is reduced, the deformation is better born, and the possibility of cracking is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a titanium alloy strip after a first pass of rolling;
FIG. 2 is a schematic view of a sixth pass rolled titanium alloy strip;
FIG. 3 is a schematic view showing a heating apparatus according to the first embodiment;
FIG. 4 is an enlarged view of part of the A direction of FIG. 3;
FIG. 5 is a schematic structural diagram of a heat insulation device according to the second embodiment;
icon: 1-U-shaped steel, 101-side edges, 102-bottom edges, 2-conveying devices, 3-preheating components, 301-shielding boxes, 302-electromagnetic induction coils, 303-high-frequency induction heating equipment, 4-heat preservation components, 401-heat preservation boxes, 402-lower electromagnetic heating rollers, 403-upper electromagnetic heating rollers, 5-width fixing mechanisms, 501-supporting plates, 502-adjusting rods, 503-adjusting knobs, 504-sliding blocks, 505-guide strips, 506-width fixing plates, 507-guide rollers and 6-titanium alloy belts.
Detailed Description
Example 1
A titanium alloy steel processing technology comprises the following steps:
s1, hot rolling a titanium alloy plate blank into a titanium alloy belt 6, specifically, the hot rolling process sequentially comprises heating, rough rolling and 3-6 times of finish rolling, wherein during rough rolling, the titanium alloy plate blank is subjected to reciprocating flat rolling by a roller on a roller way, when the thickness of the titanium alloy plate blank is smaller than 30mm, finish rolling is performed, and during finish rolling, 3-6 times of finish rolling, the titanium alloy plate blank is gradually rolled into the titanium alloy belt 6 with the required thickness.
In the rough rolling process, the roller can be designed to gradually increase the diameter from the middle part to the two ends, and the generatrix of the roller is concave in an entire circular arc, and the design is worth noting that the roller can be more easily attached to a metal blank in the rolling process, so that vibration and deflection in the rolling process are reduced, and the stability of rolling is conveniently improved. Furthermore, it will be appreciated that the diameters of the two ends of the roll differ slightly from the diameter of the middle by a small amount, typically not more than 0.3mm.
S2, conveying the titanium alloy strip 6 to a heating device through a conveying device 2, wherein the conveying device 2 adopts a roller type conveying mechanism which is conventional in the art, and the titanium alloy strip 6 enters a cold bending unit (not shown) after being heated to a target temperature; it is worth to say that the heating device arranged before entering the cold bending unit heats the titanium alloy strip 6, so that the internal stress can be eliminated, and cracking is prevented; heating can also change the microstructure of the titanium alloy strip 6, improve toughness, reduce deformation resistance, better withstand deformation, and reduce the likelihood of cracking. In practical applications, the specific temperature value of the heating channel should be selected according to the specific composition of the titanium alloy, the thickness of the titanium alloy strip 6, and other factors.
In addition, the titanium alloy plate blank is directly rolled into the titanium alloy strip 6 and then directly enters a cold bending unit for rolling forming, so that the rolling and unreeling processes are omitted, the time is greatly saved, and the production efficiency is improved.
On the basis, the heat preservation device comprises a preheating component 3 and a heat preservation component 4 which are sequentially arranged along the conveying direction of the titanium alloy belt 6, the preheating component 3 heats the titanium alloy belt 6 to the target temperature, and the heat preservation component 4 preserves the temperature of the titanium alloy belt 6 at the target temperature for a certain time. The preheating component 3 of this embodiment adopts high frequency induction heating, and the heat preservation subassembly 4 adopts electromagnetic heating roller group heating, so sets up, can be with titanium alloy area 6 rapid heating to target temperature through preheating component 3, and rethread heat preservation subassembly 4 keeps warm, makes titanium alloy area 6 be heated more evenly.
The preheating component 3 comprises a shielding box 301, an electromagnetic induction coil 302 and a high-frequency induction heating device 303, wherein the electromagnetic induction coil 302 and the high-frequency induction heating device 303 are arranged in the shielding box 301, the electromagnetic induction coil 302 is connected with the high-frequency induction heating device 303, the titanium alloy strip 6 passes through the electromagnetic induction coil 302, the high-frequency induction heating device 303 can be directly adopted in the prior market, and when the preheating component is used, the electromagnetic induction coil 302 can be used for quickly heating the titanium alloy strip 6 by starting the high-frequency induction heating device 303.
The heat preservation subassembly 4 includes insulation can 401, and a plurality of electromagnetic heating roller groups of following titanium alloy area 6 direction of delivery interval setting in the insulation can 401, and electromagnetic heating roller group includes electromagnetic heating roller 402 and the last electromagnetic heating roller 403 that corresponds with electromagnetic heating roller 402 down, and it can to adopt the conventional technical means in the art to go up electromagnetic heating roller 403 and electromagnetic heating roller 402 down, can directly purchase from the market. Furthermore, only 4 sets of electromagnetic heating roller sets are shown in the figures, it being understood that in other embodiments, electromagnetic heating roller sets may be increased or decreased.
In this embodiment, the front end and the rear end of the heat preservation device are both provided with the width fixing mechanism 5, the position of the titanium alloy strip 6 in the width direction before entering the cold bending unit is guaranteed, meanwhile, the width jacking mechanism can adjust the titanium alloy strips 6 with different widths, concretely, the width fixing mechanism 5 comprises a supporting plate 501 provided with two sides of the titanium alloy strip 6, an adjusting rod 502 is rotatably arranged between the two supporting plates 501, one end of the adjusting rod 502 is provided with an adjusting knob 503, two ends of the adjusting rod 502 are provided with threads with opposite rotation directions, two ends of the adjusting rod are respectively matched with a sliding block 504 through threads, a guide bar 505 is arranged between the two supporting plates 501, the guide bar 505 is propped against the bottom of the sliding block 504, the top of the sliding block 504 is provided with a width fixing plate 506, on the basis, the fact that the adjusting rod 502 is driven to rotate by rotating the adjusting knob 503 can drive the two sliding blocks 504 to be close to each other or on the principle is easy to adjust the distance between the two width fixing plates 506, and the titanium alloy strip 6 is limited to pass through between the two width fixing plates 506.
Further, the guide roller 507 is rotatably disposed between the upper and lower ends of the width-fixing plate 506 in this embodiment, and the arrangement of the guide roller 507 can greatly reduce friction to the side 101 of the titanium alloy strip 6, i.e. reduce abrasion to the titanium alloy strip 6.
And S3, rolling the titanium alloy strip 6 into a section steel by a cold roll forming unit, wherein the rolling forming process comprises 6-12 times of rolling, taking U-shaped steel 1 as an example, and carrying out six times of rolling, wherein the included angle formed by two side edges 101 and a bottom edge 102 after the first time is 15 degrees (shown as a 15 degree in the figure), the included angle formed by two side edges 101 and the bottom edge 102 after the second time is 30 degrees, the included angle formed by two side edges 101 and the bottom edge 102 after the third time is 45 degrees, the included angle formed by two side edges 101 and the bottom edge 102 after the fourth time is 60 degrees, the included angle formed by two side edges 101 and the bottom edge 102 after the fifth time is 75 degrees, and the included angle formed by two side edges 101 and the bottom edge 102 after the fifth time is 90 degrees (shown as a in the figure 2), and it is understood that in the second time to the fifth time, a in the figure 1 is continuously changed, and finally a U-shaped structure is formed after the sixth time. It should be noted that, in other embodiments, if more rolling passes are performed, the bending angle of the two sides 101 is smaller in each pass.
Example two
The difference between the present embodiment and the first embodiment is that, as shown in fig. 5, the adjacent electromagnetic heating roller sets in the present embodiment are staggered in the height direction, so that the titanium alloy belt 6 can form a certain bend in the insulation box 401, and meanwhile, the contact area between the electromagnetic heating roller set and the titanium alloy belt 6 is increased, so that the insulation efficiency is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The titanium alloy steel processing technology is characterized by comprising the following steps of:
s1, hot rolling a titanium alloy plate blank into a titanium alloy belt;
s2, conveying the titanium alloy belt to a heating device through a conveying device, heating the titanium alloy belt to a target temperature, and then entering a cold bending unit;
s3, rolling the titanium alloy strip into the section steel by the cold bending unit.
2. The process for machining the titanium alloy steel according to claim 1, wherein the heat preservation device comprises a preheating component and a heat preservation component which are sequentially arranged along the conveying direction of the titanium alloy belt, the preheating component heats the titanium alloy belt to the target temperature, and the heat preservation component preserves the temperature of the titanium alloy belt at the target temperature for a certain time.
3. The process for machining the titanium alloy steel according to claim 2, wherein the preheating component comprises a shielding box, an electromagnetic induction coil and high-frequency induction heating equipment, wherein the electromagnetic induction coil and the high-frequency induction heating equipment are arranged in the shielding box, the electromagnetic induction coil is connected with the high-frequency induction heating equipment, and the titanium alloy strip passes through the electromagnetic induction coil.
4. The process for machining the titanium alloy steel according to claim 2, wherein the heat preservation assembly comprises an insulation box, and a plurality of electromagnetic heating roller sets are arranged in the insulation box at intervals along the conveying direction of the titanium alloy strip, and each electromagnetic heating roller set comprises a lower electromagnetic heating roller and an upper electromagnetic heating roller corresponding to the lower electromagnetic heating roller.
5. The process for producing titanium alloy steel according to claim 4, wherein adjacent electromagnetic heating roller groups are staggered in the height direction.
6. The process for machining the titanium alloy steel according to claim 2, wherein the front end and the rear end of the heat preservation device are respectively provided with a width fixing mechanism, the width fixing mechanism comprises support plates provided with two sides of a titanium alloy belt, an adjusting rod is rotatably arranged between the two support plates, one end of the adjusting rod is provided with an adjusting knob, two ends of the adjusting rod are provided with threads with opposite rotation directions, two ends of the adjusting rod are respectively matched with a sliding block through threads, a guide bar is arranged between the two support plates, the guide bar abuts against the bottom of the sliding block, and the top of the sliding block is provided with a width fixing plate.
7. The process for producing titanium alloy steel according to claim 6, wherein guide rollers are rotatably provided between the upper and lower ends of the fixed-width plate.
8. The process according to any one of claims 1 to 7, wherein the hot rolling process in step S1 comprises heating, rough rolling and 3 to 6 pass finish rolling in this order.
9. A process for producing a titanium alloy steel according to any one of claims 1 to 7, wherein the roll forming step in step S3 comprises 6 to 12 passes of rolling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311804122.1A CN117862285A (en) | 2023-12-25 | 2023-12-25 | Titanium alloy steel processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311804122.1A CN117862285A (en) | 2023-12-25 | 2023-12-25 | Titanium alloy steel processing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117862285A true CN117862285A (en) | 2024-04-12 |
Family
ID=90583917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311804122.1A Pending CN117862285A (en) | 2023-12-25 | 2023-12-25 | Titanium alloy steel processing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117862285A (en) |
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2023
- 2023-12-25 CN CN202311804122.1A patent/CN117862285A/en active Pending
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