CN110756616B - Preparation method for reducing high-carbon martensitic stainless steel pipe - Google Patents
Preparation method for reducing high-carbon martensitic stainless steel pipe Download PDFInfo
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- CN110756616B CN110756616B CN201911044995.0A CN201911044995A CN110756616B CN 110756616 B CN110756616 B CN 110756616B CN 201911044995 A CN201911044995 A CN 201911044995A CN 110756616 B CN110756616 B CN 110756616B
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- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 35
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000004321 preservation Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 238000005097 cold rolling Methods 0.000 claims abstract description 11
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 238000000227 grinding Methods 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 claims 1
- 229910000734 martensite Inorganic materials 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 11
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 10
- 239000010935 stainless steel Substances 0.000 abstract description 8
- 229910001566 austenite Inorganic materials 0.000 abstract description 5
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- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
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- 239000003345 natural gas Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000010485 coping Effects 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
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- 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
- 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
- B21B45/02—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 for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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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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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention belongs to the technical field of metal processing, and particularly relates to a preparation method for reducing high-carbon martensitic stainless steel pipes. The preparation method comprises the steps of smelting, hot rolling, heating, hot piercing, heat preservation heating, polishing and cold rolling, wherein a three-roll skew rolling mill and a heat preservation furnace are directly communicated through a conveying rail, the process control of secondary heating is avoided, the heat preservation process is optimized, the temperature is reduced in stages, austenite is prevented from being directly transformed to martensite through the temperature control, so that a tube blank obtains a sorbite structure with extremely good plasticity, the temperature control of each link is enhanced, the risk of temperature rise of the tube blank caused by factors such as cooling furnace discharging temperature, polishing temperature, saw cutting head and tail, rolling speed and the like is considered, the difficult problem that high-carbon martensite cold rolling processing is difficult and is not beneficial to subsequent processing is solved, the production efficiency and yield can be improved, the production cost is reduced, and the prepared stainless steel has good toughness and excellent corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of metal processing, and particularly relates to a preparation method for reducing high-carbon martensitic stainless steel pipes.
Background
Martensitic stainless steel is stainless steel in which martensite is obtained even when the material is heated to a temperature of Ac1 or higher in a predetermined medium, the ferrite phase is transformed into austenite, and the cooling method is air cooling. Martensitic stainless steels have a good hardenability, which causes them to have high residual stresses and sometimes surface cracks. Further, since a martensite structure is generally obtained after the heat treatment, hardness of the workpiece is increased and cutting work is difficult, and therefore, softening annealing treatment should be performed after the heat treatment. Due to the advantages and the disadvantages, the martensitic stainless steel is mainly used for manufacturing turbine blades, wear-resistant parts and valve bodies, and the high-carbon martensitic stainless steel is also suitable for manufacturing bearings in a corrosion-resistant environment. The high-carbon martensitic stainless steel bearing is generally manufactured by punching martensitic stainless steel to a set size through a drilling machine and then can be used only through heat treatment and grinding, so that the material utilization rate is low, the cost is high, and the production efficiency is extremely low.
The current standard for martensitic stainless steel is GB 24512.3-2014 seamless steel tube for nuclear power plant part 3, which stipulates the classification and code, size, shape, weight and allowable deviation of stainless steel seamless tube, technical requirements, test method, inspection rule, package, mark and quality document, the standard only relates to austenitic stainless steel, and the standard is not stipulated for martensitic stainless steel. GB/T1220 and 2007 & ltsteel bar without repair & gt and GB/T1221 & ltsteel bar with heat resistance & gt are stipulated for round steel, flat steel, square steel and hexagonal steel, and do not relate to pipes. GB/T14975 and 2012 stainless steel seamless steel tube for structure and GB/T14976 and 2012 stainless steel seamless steel tube for fluid transportation only stipulate the chemical compositions and properties of the low-carbon martensitic stainless steel below S42020, and a processing method is not described. GB/T18254-2016 high carbon chromium bearing Steel does not refer to martensitic stainless steels. GJB 2294A-2014 specification for stainless steel for aviation and heat-resistant steel bars relates to the processing method and performance of martensitic stainless steel, but the processing of pipes is not described.
Most of the existing patents of the preparation method for reducing the martensitic stainless steel pipe relate to the preparation of low-carbon low-hardness martensitic stainless steel, and the patent with the application publication number of CN 102363863A discloses a 20Cr13 body stainless steel pipe blank and a preparation method thereof, belonging to low-carbon martensitic steel and having the regulation in the national standard. The patent with application publication number CN 102489944A discloses a processing method of a 2Cr13 rectangular pipe, which belongs to low-carbon martensite steel and is specified in the national standard. Application publication No. CN 103981444A introduces a 20Cr13 martensitic stainless steel tube blank and a preparation method thereof, belongs to low-carbon martensitic steel and is specified in the national standard. The existing martensitic stainless steel is basically prepared by the working procedures of smelting, pouring, perforating, annealing, cold rolling (cold drawing) and the like, belongs to the field of low-carbon low-hardness martensitic stainless steel, and when the mass percentage of carbon reaches more than 0.30%, the production cost of the product is high due to the limitation of the existing method, or the process cannot meet the requirements, so that the actual use of users cannot be met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for preparing high-carbon martensitic stainless steel pipes in a reduced quantity aiming at the defects of the prior art. According to the invention, the three-roller skew rolling mill and the heat preservation furnace are directly communicated through the conveying track, so that the process control of secondary heating is avoided, the heat preservation process is optimized, the temperature is reduced in stages, the austenite is prevented from being directly transformed to martensite through the temperature control, so that the tube blank obtains a sorbite structure with excellent plasticity, the temperature control of each link is enhanced, the risk of temperature rise of the tube blank caused by factors such as cooling tapping temperature, grinding temperature, saw cutting head and tail, rolling speed and the like is considered, the problems that the high-carbon martensite cold rolling processing difficulty is large and the subsequent processing is not facilitated are solved, and the prepared stainless steel has good toughness and excellent corrosion resistance.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for manufacturing a high-carbon martensitic stainless steel pipe in a reduced amount is characterized by comprising the following steps:
a preparation method for reducing high-carbon martensitic stainless steel pipes comprises the following steps:
(1) smelting: smelting the raw materials by adopting a vacuum induction electric furnace, an electric furnace-AOD duplex smelting or an electric furnace-AOD-VOD, and casting the raw materials into a billet in vacuum;
(2) hot rolling: putting the steel billet obtained in the step (1) into a first heating furnace at the temperature of 1130-1170 ℃, heating and preserving heat for 2-3 hours, and sending the steel ingot out of the furnace into a hot rolling mill for rolling to obtain a hot rolled bar with the outer diameter of 60-90 mm;
(3) heating: putting the hot-rolled bar into a second heating furnace for heating in stages, wherein the temperature of the first stage is increased to 700 ℃, the temperature is kept for 0.5 hour, the temperature of the second stage is increased to 1100-1150 ℃, and the temperature is kept for 1-3 hours;
(4) hot perforation: hot rolling and perforating by adopting a three-roller skew rolling mill, wherein the perforating speed is controlled to be 1-10 m/min, and the finishing temperature is controlled to be 1140-1200 ℃;
(5) heat preservation and heating: directly conveying the tube blank subjected to cross rolling perforation into a heat preservation furnace through a conveying track, ensuring that the charging temperature is greater than 900 ℃, then performing stage cooling, naturally cooling to 880 ℃ in the first stage, controlling the cooling speed to be less than or equal to 20 ℃/h, starting second-stage furnace cooling when the temperature is reduced to be below 500 ℃, and starting air cooling to room temperature after the temperature is reduced to be below 180 ℃;
(6) grinding: polishing and grinding the inner and outer surfaces of the pipe blank after heat preservation and heating, cutting the head and the tail of the pipe blank, and ensuring the end opening to be smooth;
(7) cold rolling: the feeding amount of the first cold rolled pipe blank is less than or equal to 3 mm/time during rolling, the swinging frequency is controlled to be 30-45 Hz, and the feeding amount and the swinging frequency can be increased after the head of the pipe blank exceeds the core rod.
The heat preservation furnace in the step (5) is provided with a temperature control system, the interior of the furnace is reinforced by adopting resistance heating, and the heating temperature is less than or equal to 1200 ℃.
And (5) cutting off the head and the tail of the tube blank in the step (6) by using a sawing machine.
The temperature of the tube blank in the coping process in the step (6) is less than or equal to 200 ℃.
Compared with the prior art, the invention has the advantages that:
(1) compared with the prior art which adopts a process of passing through a hot tube and then directly feeding into a furnace, the process of passing through the hot tube and then cooling with water for reheating adopts high-temperature heating, so that the waste of energy and time in the secondary heating process is avoided, the production efficiency is improved, and the production cost is reduced.
(2) The invention adopts the process of water cooling after the hot production tube, avoids the generation of internal stress in the water cooling process and the cracking problem in the brittle section of the martensitic stainless steel in the secondary heating process, thereby improving the yield.
(3) The invention fully considers the control of the temperature of the tube blank in each link of production, thereby avoiding the martensite transformation, greatly improving the plasticity of the material and ensuring the yield and the surface quality of the product.
Drawings
Fig. 1 is a flowchart of a method for manufacturing a high-carbon martensitic stainless steel pipe in a reduced amount according to the present invention.
FIG. 2 is a metallographic structure photograph obtained by the reduction preparation method of the high-carbon martensitic stainless steel pipe.
Detailed Description
Example 1
A preparation method for reducing high-carbon martensitic stainless steel pipes comprises the following steps:
(1) smelting: smelting by adopting a vacuum induction furnace, and casting into a martensitic stainless steel billet in vacuum;
(2) hot rolling: loading the steel billet obtained in the step (1) into a first heating furnace for heating, controlling the heating temperature to be 1140 ℃, keeping the temperature for 2 hours, and sending the steel ingot out of the furnace into a hot rolling mill for rolling to obtain a hot rolled bar with the outer diameter of 60 mm;
(3) heating: putting the hot-rolled bar into a second heating furnace for stage heating, wherein the first stage heating temperature is 700 ℃, the temperature is kept for 0.5 hour, and the second stage temperature is raised to 1130 ℃ and kept for 2 hours;
(4) hot perforation: hot rolling and punching by adopting a three-roller skew rolling mill, wherein the punching speed is controlled at 6m/min, the finishing temperature is 1160 ℃, and the rolling specification is phi 60 x 5 mm;
(5) heat preservation and heating: directly conveying the tube blank subjected to cross rolling perforation to a heat preservation furnace with the temperature of 968 ℃ through a conveying track for heat preservation and heating, then carrying out stage cooling, naturally cooling to 880 ℃ in the first stage, then controlling the cooling speed to be 20 ℃/h, starting second stage furnace cooling when the temperature is reduced to 498 ℃, cooling to below 180 ℃, and then air cooling to room temperature;
(6) grinding: polishing and grinding the inner surface and the outer surface of the pipe blank after heat preservation and heating, wherein the temperature of the pipe blank in the grinding process is 70 ℃, the head and the tail of the pipe blank are cut off, the port is ensured to be smooth, and the inner surface and the outer surface have no defects such as inclusion, scabbing, scratching, iron oxide skin and the like;
(7) cold rolling: the first cold rolled pipe blank needs to be controlled to be rolled at a speed of 3 mm/time, the swing frequency is 36Hz, after the head of the first cold rolled pipe blank exceeds the core rod, the feeding amount is increased to 5 mm/time, the swing frequency is increased to 60Hz, and the rolling specification is phi 36 x 2.6 mm.
And (3) heating the heating furnace in the step (2) by adopting natural gas.
And (4) heating the heating furnace in the step (3) by adopting natural gas.
The heat preservation furnace in the step (5) is provided with a temperature control system, the interior of the furnace is reinforced by adopting resistance heating, and the heating temperature is less than or equal to 1200 ℃.
And (4) cutting the head and the tail of the tube blank in the step (6), generally cutting by using a sawing machine, and forbidding cutting by using a grinding wheel cutting machine, so as to prevent the end from being overheated to cause martensite transformation, thereby causing cold rolling cracking.
Example 2
A preparation method for reducing high-carbon martensitic stainless steel pipes comprises the following steps:
(1) smelting: smelting by adopting a vacuum induction furnace, and casting into a martensitic stainless steel billet in vacuum;
2) hot rolling: putting the steel billet obtained in the step (1) into a first heating furnace with the temperature of 1130 ℃ for heating and heat preservation for 3 hours, and sending the steel ingot out of the furnace into a hot rolling mill for rolling to obtain a hot rolled bar with the outer diameter of 90 mm;
(3) heating: putting the hot-rolled bar into a second heating furnace for heating by stages, wherein the temperature of the first stage is increased to 700 ℃, the temperature is kept for 0.5 hour, the temperature of the second stage is increased to 1150 ℃, and the temperature is kept for 3 hours;
(4) hot perforation: hot rolling and perforating by using a three-roller skew rolling mill, wherein the perforating speed is controlled at 10m/min, the finishing temperature is controlled at 1200 ℃, and the rolling specification is phi 90 x 10 mm;
(5) heat preservation and heating: directly conveying the tube blank subjected to cross rolling perforation into a 998 ℃ heat preservation furnace through a conveying track, then carrying out stage cooling, naturally cooling to 890 ℃ in the first stage, then controlling the cooling speed to be 18 ℃/h, starting second-stage furnace cooling when the temperature is reduced to be below 500 ℃, and starting air cooling to room temperature after the temperature is reduced to be below 180 ℃;
(6) grinding: and polishing and coping the inner and outer surfaces of the pipe blank after heat preservation and heating, wherein the temperature of the pipe blank in the coping process is 58 ℃. Cutting off the head and the tail of the tube blank to ensure that the end opening is smooth, and the inner surface and the outer surface have no defects of inclusion, scabbing, scratching, iron oxide skin and the like;
(7) cold rolling: the first cold rolled pipe blank needs to be controlled to be rolled at a speed of 3 mm/time, the swing frequency is 36Hz, after the head of the first cold rolled pipe blank exceeds the core rod, the feeding amount is increased to 5 mm/time, the swing frequency is increased to 55Hz, and the rolling specification is phi 48 x 5.6 mm.
And (3) heating the heating furnace in the step (2) by adopting natural gas.
And (4) heating the heating furnace in the step (3) by adopting natural gas.
The heat preservation furnace in the step (5) is provided with a temperature control system, the interior of the furnace is reinforced by adopting resistance heating, and the heating temperature is less than or equal to 1200 ℃.
And (4) cutting the head and the tail of the tube blank in the step (6), generally cutting by using a sawing machine, and forbidding cutting by using a grinding wheel cutting machine, so as to prevent the end from being overheated to cause martensite transformation, thereby causing cold rolling cracking.
The principle of the preparation method is based on the fact that the high-temperature martensitic stainless steel is in an austenite complete recrystallization state, for example, crystal grains of slow-cooling austenite grow in the cooling process, carbon atoms diffuse for a long time, and the crystal grains are not transformed into martensite but are transformed into pearlite or a finer sorbite structure, so that the hardness of the material is reduced, and the plasticity of the material is improved. The high-carbon martensitic stainless steel is different from common martensitic stainless steel mainly in that the carbon content in the steel is different, when the carbon content is more than 0.3%, the hardenability of the steel is enhanced, and the original austenitic structure is easily transformed into martensite, so that the cooling speed must be controlled well, the martensitic stainless steel can obtain pearlite or sorbite structure at a slow cooling speed, and the cold rolling processing in the next step is facilitated.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and equivalent arrangements can be made within the spirit and scope of the present invention without departing from the spirit and scope of the present invention, which is defined by the appended claims.
Claims (3)
1. The preparation method for reducing the high-carbon martensitic stainless steel pipe is characterized by comprising the following steps of:
(1) smelting: smelting the raw materials by adopting a vacuum induction electric furnace, an electric furnace-AOD duplex smelting or an electric furnace-AOD-VOD, and casting the raw materials into a billet in vacuum;
(2) hot rolling: putting the steel billet obtained in the step (1) into a first heating furnace at the temperature of 1130-1170 ℃, heating and preserving heat for 2-3 hours, and sending the steel ingot out of the furnace into a hot rolling mill for rolling to obtain a hot rolled bar with the outer diameter of 60-90 mm;
(3) heating: putting the hot-rolled bar into a second heating furnace for heating in stages, wherein the temperature of the first stage is increased to 700 ℃, the temperature is kept for 0.5 hour, the temperature of the second stage is increased to 1100-1150 ℃, and the temperature is kept for 1-3 hours;
(4) hot perforation: hot rolling and perforating by adopting a three-roller skew rolling mill, wherein the perforating speed is controlled to be 1-10 m/min, and the finishing temperature is controlled to be 1140-1200 ℃;
(5) heat preservation and heating: the tube blank after the cross rolling perforation is directly sent to a holding furnace through a conveying track, the holding furnace is provided with a temperature control system, and the charging temperature is ensured to meet the following requirements: the charging temperature is more than 900 ℃ and less than or equal to 1200 ℃, then the temperature is reduced in stages, the temperature is naturally reduced to 880 ℃ in the first stage, then the temperature reduction speed is controlled to be less than or equal to 20 ℃/h, the second stage furnace cooling is started when the temperature is reduced to be below 500 ℃, and the air cooling is started to the room temperature after the temperature is reduced to be below 180 ℃;
(6) grinding: polishing and grinding the inner and outer surfaces of the pipe blank after heat preservation and heating, cutting the head and the tail of the pipe blank, and ensuring the end opening to be smooth;
(7) cold rolling: the feeding amount of the first cold rolled pipe blank is less than or equal to 3 mm/time during rolling, the swinging frequency is controlled to be 30-45 Hz, and the feeding amount and the swinging frequency can be increased after the head of the pipe blank exceeds the core rod.
2. The method for manufacturing a reduced quantity of high-carbon martensitic stainless steel pipe as claimed in claim 1, wherein the heat-insulating furnace in step (5) is subjected to a strengthening treatment by resistance heating.
3. The method for preparing the high-carbon martensitic stainless steel pipe in a reduced quantity according to claim 1, wherein the head and the tail of the pipe blank in the step (6) are cut off by a sawing machine.
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| CN102943211B (en) * | 2012-11-27 | 2015-12-23 | 黄山市新光不锈钢材料制品有限公司 | A kind of manufacture method of high carbon martensite Stainless Steel Band |
| JP6171851B2 (en) * | 2013-10-29 | 2017-08-02 | Ｊｆｅスチール株式会社 | Apparatus row for seamless steel pipe production and method for producing high-strength stainless steel seamless steel pipe for oil wells using the same |
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