CN216107071U - Super 13Cr seamless steel tube production system - Google Patents
Super 13Cr seamless steel tube production system Download PDFInfo
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- CN216107071U CN216107071U CN202121454721.1U CN202121454721U CN216107071U CN 216107071 U CN216107071 U CN 216107071U CN 202121454721 U CN202121454721 U CN 202121454721U CN 216107071 U CN216107071 U CN 216107071U
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Abstract
The utility model discloses a super 13Cr seamless steel tube production system, which comprises a continuous casting machine, an annealing furnace, blank processing equipment, a hole expanding machine, a hot extruding machine and a heat treatment machine, and comprises: the device comprises an annealing furnace, a lifting frame, a hearth, a measuring instrument and a circulating fan, wherein the lifting frame is connected right above the annealing furnace, the furnace shell is fixed on the outer side of the annealing furnace in a nested manner, the measuring instrument is connected to the top of the annealing furnace in a penetrating manner, and the circulating fan is fixed right above the annealing furnace in a nested manner; the furnace cover is arranged right above the annealing furnace, a furnace lining is fixedly arranged on the right side of the annealing furnace, the heating wire is arranged inside the annealing furnace, the right side of the annealing furnace is connected with a cooling fan in a penetrating mode, the extrusion die is connected with a die center support in a nesting mode. The utility model adopts the process route of continuous casting and hot extrusion, changes the forging stock into the continuous casting billet, optimizes the production process, reduces the forging procedure, avoids the loss of a dead head, and has high production efficiency, high metal yield and low cost.
Description
Technical Field
The utility model relates to the technical field of seamless steel pipes, in particular to a super 13Cr seamless steel pipe production system.
Background
The 125 steel grade super 13Cr alloy has higher element ratio, large deformation resistance and narrow hot working temperature range, belongs to alloy which is difficult to deform, and is easy to generate the defects of steel sticking and cracks by adopting the hot piercing rolling process. The hot extrusion process is to form the steel pipe under the action of three-dimensional compressive stress, has good stress condition and has special advantages for the production of high alloy which is difficult to deform. The current mature production method is as follows: smelting ingot casting, forging, annealing, skiving and polishing outside a forged blank, drilling and processing inside an extruded blank, hot extrusion molding and quenching and tempering. The casting ingot forging needs to be performed with riser cutting, the weight of the riser is about 20% -25%, the forging blank is externally scalped by a leather polishing single side for about 7-12 mm, the diameter of the inner hole of the extrusion blank is about 35-90 mm, the yield is low, and the production process is long. The continuous casting blank has no dead head, the metal shrinkage cavity is loose in the center of the blank, and the combination with the hot extrusion molding process can reduce the forging process, reduce the metal loss, improve the yield and be beneficial to improving the economic benefit.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a super 13Cr seamless steel tube production system to solve the problems of serious riser loss, low metal yield and long production process in the forging stock and extrusion process in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme: a system for producing a super 13Cr seamless steel pipe, the system comprising a continuous casting machine, an annealing furnace, a billet processing device, a reamer, a hot extrusion machine, and a heat treatment machine, comprising: the device comprises an annealing furnace, a lifting frame, a hearth, a measuring instrument and a circulating fan, wherein the lifting frame is connected right above the annealing furnace, the furnace shell is fixed on the outer side of the annealing furnace in a nested manner, the measuring instrument is connected to the top of the annealing furnace in a penetrating manner, and the circulating fan is fixed right above the annealing furnace in a nested manner; the furnace cover is arranged right above the annealing furnace, a furnace lining is fixedly arranged on the right side of the annealing furnace, the electric heating wire is arranged in the annealing furnace, and a cooling fan is connected to the right side of the annealing furnace in a penetrating manner; the extrusion die is characterized in that one side of the extrusion die is connected with a die middle support in a nested manner, one side of the extrusion die is fixedly provided with a die support through a bolt, one side of the die support is provided with a die seat, one side of the die seat is connected with a die middle pad in a clamped manner, one side of the die middle pad is connected with a die rear pad in a fitted manner, one side of the die seat is connected with an extrusion cylinder middle liner in a column manner, the outer side of the extrusion cylinder middle liner is connected with an extrusion cylinder inner liner in a nested manner, the outer side of the extrusion cylinder middle liner is wrapped and fixed with an extrusion cylinder outer sleeve, and the outer side of the extrusion cylinder outer sleeve is fixed with an extrusion cylinder in a nested manner.
Preferably, the annealing furnace is provided with a lifting frame, a hearth, a furnace shell, a measuring instrument, a circulating fan, a furnace cover, a furnace lining, an electric heating wire and a cooling fan.
Preferably, the hot extrusion machine is a 63MN horizontal extrusion machine and comprises an extrusion cylinder and an extrusion die, wherein the extrusion cylinder comprises an extrusion cylinder jacket, an extrusion cylinder lining and an extrusion cylinder lining, and the extrusion die comprises a die center support, a die holder, a die center pad and a die rear pad.
Preferably, the lifting frame is connected with the circulating fan through a bearing, and the length of the lifting frame is larger than that of the furnace shell.
Preferably, the heating wires are symmetrically distributed about a central line of the annealing furnace, and the heating wires and the cooling fan are parallel to each other.
Compared with the prior art, the utility model has the beneficial effects that: the super 13Cr seamless steel pipe production system; the process route of continuous casting and hot extrusion molding is adopted, the production process is optimized, the forging stock is changed into a continuous casting blank, and compared with the forging stock, the loss of a riser is reduced, the forging procedure is reduced, the metal yield is high, and the cost is low. After extrusion forming, the structure is compact, the crystal grains are fine, the mechanical property is good, and the comprehensive benefit is improved.
Drawings
FIG. 1 is a schematic view of a process structure of a production system according to the present invention;
FIG. 2 is a schematic view showing the internal structure of an annealing furnace according to the present invention;
FIG. 3 is a schematic view of the front cross section of the hot extrusion press of the present invention.
In the figure: 1. a continuous casting machine; 2. an annealing furnace; 3. a blank processing device; 4. a hole expanding machine; 5. a hot extruder; 6. a heat treating machine; 7. a lifting frame; 8. a hearth; 9. a furnace shell; 10. a meter; 11. a circulating fan; 12. a furnace cover; 13. a furnace lining; 14. an electric heating wire; 15. a cooling fan; 16. extruding the die; 17. supporting in a mold; 18. supporting a mould; 19. the extruding cylinder is sleeved; 20. backing up the die; 21. an extrusion cylinder; 22. a cushion in the mold; 23. a die holder; 24. lining the extrusion container; 25. the extrusion cylinder is lined.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a production system of a super 13Cr seamless steel pipe, the production system comprises a continuous casting machine 1, an annealing furnace 2, a blank processing device 3, a broaching machine 4, a hot extruding machine 5 and a heat treating machine 6, and comprises:
the device comprises an annealing furnace 2, a lifting frame 7 is connected right above the annealing furnace 2, a hearth 8 is arranged on the outer side of the annealing furnace 2, a furnace shell 9 is fixed on the outer side of the annealing furnace 2 in a nested mode, a metering instrument 10 is connected to the top of the annealing furnace 2 in a penetrating mode, and a circulating fan 11 is fixed right above the annealing furnace 2 in a nested mode;
the furnace cover 12 is arranged right above the annealing furnace 2, a furnace lining 13 is fixedly arranged on the right side of the annealing furnace 2, the heating wire 14 is arranged inside the annealing furnace 2, and the right side of the annealing furnace 2 is connected with a cooling fan 15 in a penetrating way;
the extrusion die 16 is characterized in that a die middle support 17 is connected to one side of the extrusion die 16 in a nested mode, a die support 18 is fixed to one side of the extrusion die 16 through a bolt, a die seat 23 is arranged on one side of the die support 18, a die middle pad 22 is connected to one side of the die seat 23 in a clamped mode, a die rear pad 20 is connected to one side of the die middle pad 22 in a fit mode, an extrusion cylinder middle liner 25 is connected to one side of the die seat 23 in a column mode, an extrusion cylinder inner liner 24 is connected to the outer side of the extrusion cylinder middle liner 25 in a nested mode, an extrusion cylinder outer sleeve 19 is fixed to the outer side of the extrusion cylinder inner liner 25 in a wrapped mode, and an extrusion cylinder 21 is fixed to the outer side of the extrusion cylinder outer sleeve 19 in a nested mode.
The annealing furnace 2 is provided with a lifting frame 7, a hearth 8, a furnace shell 9, a meter 10, a circulating fan 11, a furnace cover 12, a furnace lining 13, an electric heating wire 14 and a cooling fan 15.
The hot extrusion machine 5 is a 63MN horizontal extrusion machine and comprises an extrusion container 21 and an extrusion die 16, wherein the extrusion container comprises an extrusion container outer sleeve 19, an extrusion container middle liner 25 and an extrusion container inner liner 24, and the extrusion die 16 comprises a die middle support 17, a die support 18, a die holder 23, a die middle cushion 22 and a die back cushion 20.
The lifting frame 7 is connected with the circulating fan 11 through a bearing, and the length of the lifting frame 7 is larger than that of the furnace shell 9.
The heating wires 14 are symmetrically distributed about the center line of the annealing furnace 2, and the heating wires 14 and the cooling fan 15 are parallel to each other.
The super 13Cr seamless steel tube with the yield strength of 125 steel grade produced by the method has the specification of phi 177.8mm multiplied by 10.36mm multiplied by 10000 mm. The production steps are as follows:
preparing a blank: producing a super 13Cr continuous casting pipe blank by using a continuous casting process; the chemical composition of the tube blank meets the requirements of table 1:
TABLE 1.177.8 mm 10.36mm super 13Cr pipe blank compositional test data (% by mass)
Secondly, blank annealing: annealing the continuously cast tube blank to reduce the hardness of the continuously cast tube blank; the annealing temperature is 750-830 ℃, the heat preservation is carried out for 6 hours, and the temperature is cooled to below 400 ℃ along with the furnace.
Processing the blank: processing the single edge of the outer circle of the cast blank to 358mm, processing the diameter of the central hole to 65mm, and removing oxide skin on the surface, loose center and cracks.
Heating before reaming: the machined blank is uniformly heated to 1150 +/-5 ℃ by an induction heating furnace.
Carrying out hot broaching on the blank: after heating, firstly, descaling the blank by high-pressure water, and then respectively and uniformly coating glass powder on the inner wall and the outer wall of the blank; and carrying out hot reaming in the reaming barrel, wherein the inner diameter of the reaming barrel is 365mm, the diameter of the reaming head is 170mm, and the reaming speed is 160-180 mm/s.
Sixthly, heating before extruding: and (3) descaling the reamed blank by high-pressure water, and uniformly heating the reamed blank to 1170 +/-20 ℃ before extrusion.
Billet reduction: before extrusion, glass powder is respectively and uniformly coated on the inner wall and the outer wall of the blank, the blank is extruded in an extrusion cylinder, the inner diameter of the extrusion cylinder is 375mm, the inner diameter of an extrusion die is 182.5mm, a core rod is 160mm, the extrusion speed is 200-300 mm/s, and the extruded tube is slowly cooled to produce the extruded pierced billet with the specification of phi 177.8mm multiplied by 10.36 mm.
Carrying out pierced billet heat treatment: uniformly heating the steel pipe to 980 ℃, preserving heat for 1h, then quickly cooling by using air blowing, and finishing quenching treatment when the temperature of the steel pipe is cooled to normal temperature; then evenly heating to 580 ℃, preserving heat for 2.0h, discharging from the furnace, air cooling, and tempering to obtain the finished product of the super 13Cr martensitic stainless steel pipe with the performance of 125 steel grade, thereby increasing the overall practicability.
Those not described in detail in this specification are within the skill of the art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A super 13Cr seamless steel tube production system, the production system comprises a continuous casting machine (1), an annealing furnace (2), a billet processing device (3), a hole expanding machine (4), a hot extrusion machine (5) and a heat treatment machine (6), and is characterized in that: the method comprises the following steps:
the device comprises an annealing furnace (2), wherein a lifting frame (7) is connected right above the annealing furnace (2), a hearth (8) is arranged on the outer side of the annealing furnace (2), a furnace shell (9) is fixed on the outer side of the annealing furnace (2) in a nested mode, a metering instrument (10) is connected to the top of the annealing furnace (2) in a penetrating mode, and a circulating fan (11) is fixed right above the annealing furnace (2) in a nested mode;
the furnace cover (12) is arranged right above the annealing furnace (2), a furnace lining (13) is fixedly arranged on the right side of the annealing furnace (2), the heating wire (14) is arranged inside the annealing furnace (2), and a cooling fan (15) is connected to the right side of the annealing furnace (2) in a penetrating manner;
the extrusion die comprises an extrusion die (16), wherein a die middle support (17) is connected to one side of the extrusion die (16) in a nested manner, a die support (18) is fixed to one side of the extrusion die (16) through a bolt, a die seat (23) is arranged on one side of the die support (18), a die middle pad (22) is connected to one side of the die seat (23) in a clamped manner, a die rear pad (20) is connected to one side of the die middle pad (22) in a jointed manner, a side column of the die seat (23) is connected with an extrusion cylinder middle lining (25), an extrusion cylinder inner lining (24) is connected to the outer side of the extrusion cylinder middle lining (25) in a nested manner, an extrusion cylinder outer sleeve (19) is fixed to the outer side of the extrusion cylinder outer sleeve (19) in a nested manner, and an extrusion cylinder (21) is fixed to the outer side of the extrusion cylinder outer sleeve (19) in a nested manner.
2. The system for producing the super 13Cr seamless steel pipe according to claim 1, wherein: the annealing furnace (2) is provided with a lifting frame (7), a hearth (8), a furnace shell (9), a meter (10), a circulating fan (11), a furnace cover (12), a furnace lining (13), an electric heating wire (14) and a cooling fan (15).
3. The system for producing the super 13Cr seamless steel pipe according to claim 1, wherein: the hot extrusion machine (5) is a 63MN horizontal extrusion machine and comprises an extrusion cylinder (21) and an extrusion die (16), wherein the extrusion cylinder comprises an extrusion cylinder jacket (19), an extrusion cylinder middle lining (25) and an extrusion cylinder lining (24), and the extrusion die (16) comprises a die middle support (17), a die support (18), a die holder (23), a die middle pad (22) and a die rear pad (20).
4. The system for producing the super 13Cr seamless steel pipe according to claim 1, wherein: the lifting frame (7) is connected with the circulating fan (11) through a bearing, and the length of the lifting frame (7) is larger than that of the furnace shell (9).
5. The system for producing the super 13Cr seamless steel pipe according to claim 1, wherein: the heating wires (14) are symmetrically distributed about the central line of the annealing furnace (2), and the heating wires (14) are parallel to the cooling fan (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121454721.1U CN216107071U (en) | 2021-06-29 | 2021-06-29 | Super 13Cr seamless steel tube production system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121454721.1U CN216107071U (en) | 2021-06-29 | 2021-06-29 | Super 13Cr seamless steel tube production system |
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| CN216107071U true CN216107071U (en) | 2022-03-22 |
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