CN112170519A - Production method of L80-9Cr martensitic stainless steel pipe - Google Patents
Production method of L80-9Cr martensitic stainless steel pipe Download PDFInfo
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- CN112170519A CN112170519A CN202011054358.4A CN202011054358A CN112170519A CN 112170519 A CN112170519 A CN 112170519A CN 202011054358 A CN202011054358 A CN 202011054358A CN 112170519 A CN112170519 A CN 112170519A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/21—Presses specially adapted for extruding metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
- B21C43/02—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass combined with or specially adapted for use in connection with drawing or winding machines or apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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Abstract
The invention relates to a production method of an L80-9Cr martensitic stainless steel pipe, which comprises the following steps: preparing a blank: centrifugally casting to produce a hollow pipe blank; secondly, blank annealing: annealing the hollow pipe blank to reduce the hardness of the hollow pipe blank; processing the blank: processing the annealed hollow pipe blank, and removing the defects of air holes, shrinkage porosity and slag inclusion on the inner wall and the outer wall; fourthly, hot reaming: heating to 1120-1160 ℃, and carrying out hot reaming in a reaming barrel; carrying out hot extrusion: heating to 1160-1210 deg.c, and hot extruding in an extruding barrel; sixthly, heat treatment: heating the steel pipe to 970-1000 ℃, and blowing air for quick cooling; then heating to 680-720 ℃ for tempering treatment to obtain the finished steel pipe. The production system comprises a centrifugal casting machine, an annealing furnace, a blank processing device, a reamer, a hot extrusion machine and a heat treatment furnace. The invention adopts the process route of centrifugal casting and hot extrusion, optimizes the production process, reduces the loss of the riser, and has high metal yield and low cost.
Description
Technical Field
The invention belongs to the technical field of seamless steel pipe production, and particularly relates to a production method of an L80-9Cr martensitic stainless steel pipe.
Background
The alloy with the high content of the L80-9Cr alloy elements has high deformation resistance and a narrow hot working temperature range, belongs to an alloy difficult to deform, and is easy to generate steel sticking and crack defects when produced by a 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 dead head cutting, the weight of the dead head accounts for about 20% -25%, a single side of a forged blank is 7-12 mm by turning off a leather, the diameter of a hole in an extrusion blank is about 35-90 mm, the yield is low, and the production process is long. The centrifugal casting is to fill and solidify the metal liquid under the action of centrifugal force, has no riser, good metal feeding effect, high nucleation rate and compact casting structure, is combined with a hot extrusion molding process, can reduce forging procedures, improves the yield and is beneficial to improving the economic benefit.
The invention patent application with publication number CN201911044995.0 discloses a method for preparing high-carbon martensitic stainless steel pipes in a reduced quantity, which comprises the steps of smelting, hot rolling, heating, hot perforation, heat preservation heating, coping and cold rolling. The application of the method solves the problems that the high-carbon martensite cold rolling processing difficulty is large and the subsequent processing is not facilitated, but the method cannot be used for producing the L80-9Cr martensite stainless steel pipe.
Disclosure of Invention
The invention aims to provide a production method of an L80-9Cr martensitic stainless steel pipe, which has the advantages of reasonably configuring production equipment, optimizing the production process, reducing forging procedures, improving the yield of the steel pipe and reducing the production cost.
The technical scheme of the invention is as follows: the production method of the L80-9Cr martensitic stainless steel tube utilizes a production system of the L80-9Cr martensitic stainless steel tube to produce, and comprises the following production steps:
preparing a blank: producing an L80-9Cr alloy hollow pipe blank by using a centrifugal casting process;
secondly, blank annealing: annealing the centrifugally cast hollow pipe blank to reduce the hardness of the hollow pipe blank;
processing the blank: processing one side of the outer wall of the annealed hollow pipe blank to remove 4-8 mm, processing one side of the inner wall to remove 3-7 mm, and removing the defects of air holes, shrinkage porosity and slag inclusion on the inner wall and the outer wall;
fourthly, hot reaming: uniformly heating the blank processed in the step three to 1120-1160 ℃, and carrying out hot hole expansion in a hole expansion barrel;
carrying out hot extrusion: uniformly heating the blank subjected to hot reaming to 1160-1210 ℃, and then carrying out hot extrusion deformation operation in an extrusion barrel through an extrusion die, a core rod and an extrusion pad to obtain a steel pipe with finished product size;
sixthly, heat treatment: and uniformly heating the steel pipe produced in the step fifthly to 970-1000 ℃, then carrying out blowing quick cooling by using a fan, cooling the steel pipe to normal temperature, uniformly heating to 680-720 ℃ and carrying out tempering treatment to obtain the steel pipe with finished quality and performance.
The chemical components of the L80-9Cr martensitic stainless steel tube meet the requirements of L80-9Cr in API Spec 5CT, and the content of P is not more than 0.017 percent, and the content of S is not more than 0.007 percent; the content of O is not more than 30ppm, the content of N is not more than 110ppm, and the content of H is not more than 2.5 ppm. The excircle diameter of the L80-9Cr seamless steel tube is between phi 100-phi 273mm, and the wall thickness is between 9 mm-28 mm. And in the blank annealing stage, the annealing temperature is 840-870 ℃, the temperature is kept for 6h, and the blank is cooled to below 200 ℃ along with the furnace. And in the hot hole expanding stage, after the blank is uniformly heated to the temperature, firstly removing phosphorus by using high-pressure water, then lubricating the inner surface and the outer surface by using glass powder, and then performing hot hole expanding, wherein the hole expanding speed is 120-220 mm/s, and the hole expanding ratio is 1.01-1.30. In the hot extrusion stage, the heated blank is firstly subjected to high-pressure water descaling, then the inner surface and the outer surface of the heated blank are lubricated by glass powder, and then hot extrusion is carried out, wherein the extrusion speed is 150-300 mm/S, and the extrusion ratio is 4-10. The mechanical property of the material after heat treatment meets the requirements of L80-9Cr in API 5 CT.
The production system of the L80-9Cr martensitic stainless steel pipe comprises a centrifugal casting machine, an annealing furnace, a blank processing device, a hole expanding machine, a hot extruding machine, a heat treatment furnace and a quality inspection device, wherein the centrifugal casting machine, the annealing furnace, the blank processing device, the hole expanding machine, the hot extruding machine and the heat treatment furnace are sequentially arranged. The inspection equipment comprises dimension specification inspection equipment and mechanical property inspection equipment. 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.
According to the production method of the L80-9Cr martensitic stainless steel pipe, production equipment is reasonably arranged, a centrifugal casting and hot extrusion forming process route is adopted, the production process is optimized, a forging blank is changed into a hollow casting blank, and compared with a forging blank, the loss of a riser is reduced, the forging process is reduced, the metal yield is high, and the cost is low. The centrifugal blank has compact structure, fine crystal grains, less non-metallic inclusions and good mechanical property, and the good blank state provides a foundation for the performance of the steel pipe.
Drawings
FIG. 1 is a schematic flow chart of a production system of L80-9Cr martensitic stainless steel pipes;
FIG. 2 is a schematic view of the structure of an annealing furnace;
FIG. 3 is a schematic view of the structure of a heat extruder;
wherein: 1-centrifugal casting machine, 2-annealing furnace, 3-blank processing equipment, 4-hole expanding machine, 5-heat extruding machine, 6-heat treating machine, 7-lifting frame, 8-hearth, 9-furnace shell, 10-metering instrument, 11-circulating fan, 12-furnace cover, 13-furnace lining, 14-heating wire, 15-cooling fan, 16-extruding die, 17-die middle support, 18-die support, 19-extruding cylinder jacket, 20-die rear pad, 21-extruding cylinder, 22-die middle pad, 23-die holder, 24-extruding cylinder lining and 25-extruding cylinder middle lining.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
The production system of the L80-9Cr martensitic stainless steel pipe comprises a centrifugal casting machine 1, an annealing furnace 2, a blank processing device 3, a hole expanding machine 4, a hot extruding machine 5, a heat treatment furnace 6 and a quality inspection device, as shown in figure 1. The centrifugal casting machine, the annealing furnace, the blank processing equipment, the hole expanding machine, the hot extrusion machine and the heat treatment furnace are sequentially arranged, and the inspection equipment comprises dimension and specification inspection equipment and mechanical property inspection equipment. As shown in FIG. 2, the annealing furnace 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, heating wires 14 and a cooling fan 15. The hot extrusion press is a 63MN horizontal extrusion press, and as shown in fig. 3, the extrusion press comprises a container 21 and an extrusion die 16, the container comprises a container jacket 19, a container liner 25 and a container liner 24, and the extrusion die 16 comprises a die center support 17, a die support 18, a die holder 23, a die center pad 22 and a die rear pad 20. The other equipment is conventional production equipment.
The production method of the L80-9Cr martensitic stainless steel pipe 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 an L80-9Cr alloy hollow pipe blank by using a centrifugal casting process; the chemical composition of the hollow steel pipe blank meets the requirements of table 1:
TABLE 1L 80-9Cr composition/mass fraction (%)
The chemical components of the L80-9Cr martensitic stainless steel tube meet the requirements of L80-9Cr in API Spec 5CT, and the content of P is not more than 0.017 percent, and the content of S is not more than 0.007 percent; the content of O is not more than 30ppm, the content of N is not more than 110ppm, and the content of H is not more than 2.5 ppm.
Secondly, blank annealing: annealing the centrifugally cast hollow pipe blank to reduce the hardness of the hollow pipe blank; and (4) annealing at 845-850 ℃, preserving heat for 6 hours, and cooling to below 200 ℃ along with the furnace.
Processing the blank: and (3) processing the single side of the outer wall of the annealed hollow pipe blank to remove 8mm, processing the single side of the inner wall to remove mm, and removing the defects of air holes, shrinkage porosity and slag inclusion on the inner wall and the outer wall.
Heating before reaming: uniformly heating the machined blank to 1140 +/-5 ℃ by using 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 308mm, the diameter of the reaming head is 170mm, the reaming ratio is 1.25, and the reaming speed is 180 mm/s.
Sixthly, heating before extruding: descaling the reamed blank by high-pressure water, and uniformly heating the reamed blank to 1180 +/-5 ℃ 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 315mm, the inner diameter of an extrusion die is 182.5mm, a core rod is 160mm, the extrusion ratio is 9.4, the extrusion speed is 300mm/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 700 ℃, preserving heat for 2.0h, discharging from the furnace, air cooling, and tempering to obtain the quality performance of the finished product. The martensitic stainless steel pipe of L80 ~ 9Cr, the material mechanical properties of product satisfy the requirement of L80 ~ 9Cr in API 5 CT.
Claims (9)
1. A production method of an L80-9Cr martensitic stainless steel pipe is used for production by an L80-9Cr martensitic stainless steel pipe production system, and is characterized by comprising the following production steps:
preparing a blank: producing an L80-9Cr alloy hollow pipe blank by using a centrifugal casting process;
secondly, blank annealing: annealing the centrifugally cast hollow pipe blank to reduce the hardness of the hollow pipe blank;
processing the blank: processing one side of the outer wall of the annealed hollow pipe blank to remove 4-8 mm, processing one side of the inner wall to remove 3-7 mm, and removing the defects of air holes, shrinkage porosity and slag inclusion on the inner wall and the outer wall;
fourthly, hot reaming: uniformly heating the blank processed in the step three to 1120-1160 ℃, and carrying out hot hole expansion in a hole expansion barrel;
carrying out hot extrusion: uniformly heating the blank subjected to hot reaming to 1160-1210 ℃, and then carrying out hot extrusion deformation operation in an extrusion barrel through an extrusion die, a core rod and an extrusion pad to obtain a steel pipe with finished product size;
sixthly, heat treatment: and uniformly heating the steel pipe produced in the step fifthly to 970-1000 ℃, then carrying out blowing quick cooling by using a fan, cooling the steel pipe to normal temperature, uniformly heating to 680-720 ℃ and carrying out tempering treatment to obtain the steel pipe with finished quality and performance.
2. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 1, wherein the method comprises the following steps: the chemical components of the L80-9Cr martensitic stainless steel tube meet the requirements of L80-9Cr in API Spec 5CT, and the content of P is not more than 0.017 percent, and the content of S is not more than 0.007 percent; the content of O is not more than 30ppm, the content of N is not more than 110ppm, and the content of H is not more than 2.5 ppm.
3. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 1, wherein the method comprises the following steps: the outer circle diameter of the L80-9Cr seamless steel tube is between phi 100 mm and phi 273mm, and the wall thickness is between 9mm and 28 mm.
4. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 1, wherein the method comprises the following steps: and in the blank annealing stage, the annealing temperature is 840-870 ℃, the temperature is kept for 6h, and the blank is cooled to below 200 ℃ along with the furnace.
5. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 1, wherein the method comprises the following steps: in the hot hole expansion stage, after the blank is uniformly heated to the temperature, high-pressure water dephosphorization is firstly carried out, then the inner surface and the outer surface are lubricated by glass powder, and then hot hole expansion is carried out, wherein the hole expansion speed is 120-220 mm/s, and the hole expansion ratio is 1.01-1.30.
6. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 1, wherein the method comprises the following steps: in the hot extrusion stage, the heated blank is firstly subjected to high-pressure water descaling, then the inner surface and the outer surface of the heated blank are lubricated by glass powder, and then hot extrusion is carried out, wherein the extrusion speed is 150-300 mm/S, and the extrusion ratio is 4-10.
7. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 1, wherein the method comprises the following steps: the mechanical property of the material after heat treatment meets the requirements of L80-9Cr in API 5 CT.
8. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 1, wherein the method comprises the following steps: the production system of the L80-9Cr martensitic stainless steel pipe comprises a centrifugal casting machine (1), an annealing furnace (2), blank processing equipment (3), a hole expanding machine (4), a hot extruding machine (5), a heat treatment furnace (6) and quality inspection equipment, wherein the centrifugal casting machine, the annealing furnace, the blank processing equipment, the hole expanding machine, the hot extruding machine and the heat treatment furnace are sequentially arranged; the inspection equipment comprises dimension specification inspection equipment and mechanical property inspection equipment.
9. The method for producing an L80-9Cr martensitic stainless steel pipe as claimed in claim 8, wherein the method comprises the following steps: the annealing furnace 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).
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| CN202011054358.4A CN112170519A (en) | 2020-09-29 | 2020-09-29 | Production method of L80-9Cr martensitic stainless steel pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481434A (en) * | 2021-06-21 | 2021-10-08 | 邯郸新兴特种管材有限公司 | Thick-wall super 13Cr seamless steel pipe with yield strength of 125 steel grade and production method thereof |
| CN113909323A (en) * | 2021-09-16 | 2022-01-11 | 张家港广大特材股份有限公司 | Manufacturing method of hot extrusion pipe |
| CN113909323B (en) * | 2021-09-16 | 2024-05-03 | 张家港广大特材股份有限公司 | Method for manufacturing hot extrusion tube |
-
2020
- 2020-09-29 CN CN202011054358.4A patent/CN112170519A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481434A (en) * | 2021-06-21 | 2021-10-08 | 邯郸新兴特种管材有限公司 | Thick-wall super 13Cr seamless steel pipe with yield strength of 125 steel grade and production method thereof |
| CN113481434B (en) * | 2021-06-21 | 2022-05-31 | 邯郸新兴特种管材有限公司 | Thick-wall super 13Cr seamless steel pipe with yield strength of 125 steel grade and production method thereof |
| CN113909323A (en) * | 2021-09-16 | 2022-01-11 | 张家港广大特材股份有限公司 | Manufacturing method of hot extrusion pipe |
| CN113909323B (en) * | 2021-09-16 | 2024-05-03 | 张家港广大特材股份有限公司 | Method for manufacturing hot extrusion tube |
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