CN112570487A - Molding process for producing X80 pipeline steel seamless steel tube by adopting phi 800 mm large round billet - Google Patents
Molding process for producing X80 pipeline steel seamless steel tube by adopting phi 800 mm large round billet Download PDFInfo
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- CN112570487A CN112570487A CN202011332291.6A CN202011332291A CN112570487A CN 112570487 A CN112570487 A CN 112570487A CN 202011332291 A CN202011332291 A CN 202011332291A CN 112570487 A CN112570487 A CN 112570487A
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- heating
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000465 moulding Methods 0.000 title claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000000137 annealing Methods 0.000 claims abstract description 25
- 238000005097 cold rolling Methods 0.000 claims abstract description 13
- 238000005242 forging Methods 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000004080 punching Methods 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims description 15
- 238000002791 soaking Methods 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B21B45/0239—Lubricating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Abstract
The invention discloses a molding process for producing an X80 pipeline steel seamless steel tube by adopting a phi 800 mm specification large round billet, which specifically comprises the following steps: firstly, heating a forging stock; secondly, perforating; step three, vacuum annealing; fourthly, straightening; fifthly, acid washing; sixthly, cold rolling; seventhly, performing secondary treatment; by controlling the heating temperature and filling the lubricant into the blank centering hole during punching, the problems that the steel pipe is difficult to punch at low temperature and is easy to stick to a guide disc in the prior art are solved, and the X80 pipeline steel seamless steel pipe has excellent mechanical properties through vacuum annealing and acid washing and has a wide application prospect in the production industry.
Description
Technical Field
The invention relates to the technical field of steel processing, in particular to a forming process for producing an X80 pipeline steel seamless steel tube by adopting a phi 800 mm specification large round blank.
Background
As one of five transportation modes (railway, highway, water transportation, aviation and pipeline), pipeline transportation has been in the world for 100 years, and the pipeline transportation mode has the characteristics of economy, safety, high efficiency, no interruption, no pollution and the like, and is the most convenient and economic transportation mode for energy media such as petroleum, natural gas, coal and the like. With the development of the energy industry and the development of offshore and deep sea oil and gas fields, seamless steel pipes for pipelines are selected in projects from the initial X42 to the X65, X70 and even the X80 which are commonly used at present, and the high steel grade becomes one of the development directions. The requirements of X90 and X100 steel grade seamless steel pipes are newly increased in the API5L standard, which fully indicates that high steel grade becomes a development trend and has a wide market. The steel pipe wall thickness and the quality can be reduced, the steel cost is saved, and the steel pipe transportation cost and the welding workload can be reduced due to the reduction of the steel pipe wall thickness, so that the investment cost and the operation cost of pipeline construction are greatly reduced, and the application of high-grade steel pipes becomes an inevitable trend of pipeline engineering development.
The high-temperature perforation of the seamless steel pipe is not beneficial to the control of the structure performance and is suitable for the low-temperature perforation. In the process of perforating, the steel pipe is easy to stick to two guide discs of a perforating machine, and scabs adhered on the guide discs scratch the surface of the steel pipe; before entering the cold rolling process, machining is necessary to remove surface defects, which results in a great reduction in product yield.
Disclosure of Invention
The invention aims to provide a process for producing an X80 pipeline steel seamless steel tube by adopting a phi 800 mm specification large round blank aiming at the defects of the prior art.
The technical scheme for solving the problems comprises the following steps: the forming process for producing the X80 pipeline steel seamless steel tube by adopting the phi 800 mm specification large round billet comprises the following steps:
firstly, heating a forging blank, heating the round blank with the specification of phi 800 mm to the forging blank, forging the forging blank into a solid blank suitable for perforation formation, heating the solid blank by adopting an annular heating furnace, and sequentially preheating, heating and soaking the round blank by adopting the annular heating furnace;
step two, perforating: punching a blank centering hole at one end of the solid blank, filling a lubricant into the blank centering hole after the solid blank is discharged out of the annular furnace, and starting a skew piercing mill set to perform piercing rolling on the solid blank;
step three, vacuum annealing: carrying out vacuum annealing treatment on the perforated tubular billet for 2-3 h at the annealing temperature of 550-680 ℃;
fourthly, straightening: straightening the capillary tube after vacuum annealing;
step five, acid washing: pickling the straightened capillary tube with acid liquor at 50-65 ℃ for 5-20 min;
sixth step, cold rolling: carrying out primary cold rolling on the pickled tubular billet; the cold rolling deformation is 30-50%;
seventh step, secondary treatment: and (4) repeating the steps of 4-6 to the cold-rolled capillary tube to obtain the X80 pipeline steel seamless steel tube.
Further, it is characterized in that: the temperature of the preheating stage is controlled to be 1000-1050 ℃, and the heating time is 5-7 hours; the temperature in the heating stage is less than or equal to 1300 ℃, and the heating time is 1.5-2 hours; the temperature of the soaking stage is controlled to be 1280-1320 ℃, the heating time is 1.5-2 hours, and the volume concentration of oxygen in the micro-oxidation atmosphere is 2-4%.
Further, it is characterized in that: and in the soaking stage, the round billet is placed in a micro-oxidation atmosphere.
Further: the temperature of the soaking section of the perforated annular furnace is 850-900 ℃.
Further: the rotating speed of the guide disc of the cross piercing mill set is 0.5-2 m/s, and the rolling speed is 0.33-0.8 m/s.
Further, during vacuum annealing, the annealing temperature is 580-680 ℃.
Further, in the vacuum annealing, the annealing temperature was 650 ℃.
Further, the cold rolling deformation is 35-45%.
Further, the diameter of the blank centering hole is 30-80 mm.
The invention has the following beneficial effects:
the invention provides a molding process for producing an X80 pipeline steel seamless steel tube by adopting a phi 800 mm large round billet, which solves the problems of difficult low-temperature perforation of the steel tube, easy adhesion with a guide disc and the like in the prior art by filling a lubricant into a blank centering hole during perforation through controlling the heating temperature, and ensures that the X80 pipeline steel seamless steel tube has excellent mechanical properties through vacuum annealing and acid pickling, and has wider application prospect in the production industry.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The forming process for producing the X80 pipeline steel seamless steel tube by adopting the phi 800 mm specification large round billet comprises the following steps:
firstly, heating a forging blank, heating the round blank with the specification of phi 800 mm to the forging blank, forging the forging blank into a solid blank suitable for perforation formation, heating the solid blank by adopting an annular heating furnace, and sequentially preheating, heating and soaking the round blank by adopting the annular heating furnace; the temperature of the preheating stage is controlled to be 1000-1050 ℃, and the heating time is 5-7 hours; the temperature in the heating stage is less than or equal to 1300 ℃, and the heating time is 1.5-2 hours; in the soaking stage, the round billet is placed in a micro-oxidation atmosphere, the temperature is controlled to be 1280-1320 ℃, the heating time is 1.5-2 hours, and the micro-oxidation atmosphere is that the volume concentration of oxygen is 2-4%;
step two, perforating: punching a blank centering hole at one end of a solid blank, wherein the diameter of the blank centering hole is 30-80 mm, the temperature of a soaking section of a perforating annular furnace is 850-900 ℃, filling a lubricant into the blank centering hole after the solid blank is discharged out of the annular furnace, starting an oblique piercing and perforating unit to perform solid blank piercing and rolling, the rotating speed of a guide disc is 0.5-2 m/s, and the rolling speed is 0.33-0.8 m/s;
step three, vacuum annealing: carrying out vacuum annealing treatment on the perforated tubular billet for 2-3 h at the annealing temperature of 550-680 ℃; the annealing temperature is preferably 580-680 ℃, particularly 650 ℃;
fourthly, straightening: straightening the capillary tube after vacuum annealing;
step five, acid washing: pickling the straightened capillary tube with acid liquor at 50-65 ℃ for 5-20 min;
sixth step, cold rolling: carrying out primary cold rolling on the pickled tubular billet; the cold rolling deformation is 30-50%; preferably 35 to 45 percent;
seventh step, secondary treatment: and (4) repeating the steps of 4-6 to the cold-rolled capillary tube to obtain the X80 pipeline steel seamless steel tube.
The invention provides a molding process for producing an X80 pipeline steel seamless steel tube by adopting a phi 800 mm large round billet, which solves the problems of difficult low-temperature perforation of the steel tube, easy adhesion with a guide disc and the like in the prior art by filling a lubricant into a blank centering hole during perforation through controlling the heating temperature, and ensures that the X80 pipeline steel seamless steel tube has excellent mechanical properties through vacuum annealing and acid pickling, and has wider application prospect in the production industry.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (9)
1. A molding process for producing an X80 pipeline steel seamless steel tube by using a phi 800 mm specification large round billet is characterized by comprising the following steps of: the method specifically comprises the following steps:
firstly, heating a forging blank, heating the round blank with the specification of phi 800 mm to the forging blank, forging the forging blank into a solid blank suitable for perforation formation, heating the solid blank by adopting an annular heating furnace, and sequentially preheating, heating and soaking the round blank by adopting the annular heating furnace;
step two, perforating: punching a blank centering hole at one end of the solid blank, filling a lubricant into the blank centering hole after the solid blank is discharged out of the annular furnace, and starting a skew piercing mill set to perform piercing rolling on the solid blank;
step three, vacuum annealing: carrying out vacuum annealing treatment on the perforated tubular billet for 2-3 h at the annealing temperature of 550-680 ℃;
fourthly, straightening: straightening the capillary tube after vacuum annealing;
step five, acid washing: pickling the straightened capillary tube with acid liquor at 50-65 ℃ for 5-20 min;
sixth step, cold rolling: carrying out primary cold rolling on the pickled tubular billet; the cold rolling deformation is 30-50%;
seventh step, secondary treatment: and (4) repeating the steps of 4-6 to the cold-rolled capillary tube to obtain the X80 pipeline steel seamless steel tube.
2. The process for producing the X80 pipeline steel seamless steel tube by using the phi 800 mm specification large round billet according to claim 1, wherein the process comprises the following steps: the temperature of the preheating stage is controlled to be 1000-1050 ℃, and the heating time is 5-7 hours; the temperature in the heating stage is less than or equal to 1300 ℃, and the heating time is 1.5-2 hours; the temperature of the soaking stage is controlled to be 1280-1320 ℃, the heating time is 1.5-2 hours, and the volume concentration of oxygen in the micro-oxidation atmosphere is 2-4%.
3. The process for producing the X80 pipeline steel seamless steel tube by adopting the phi 800 mm specification large round billet according to claim 1 or 2, wherein the process comprises the following steps: and in the soaking stage, the round billet is placed in a micro-oxidation atmosphere.
4. The process for producing the X80 pipeline steel seamless steel tube by using the phi 800 mm specification large round billet according to claim 1, wherein the process comprises the following steps: the temperature of the soaking section of the perforated annular furnace is 850-900 ℃.
5. The process for producing the X80 pipeline steel seamless steel tube by using the phi 800 mm specification large round billet according to claim 1, wherein the process comprises the following steps: the rotating speed of the guide disc of the cross piercing mill set is 0.5-2 m/s, and the rolling speed is 0.33-0.8 m/s.
6. The process for producing the X80 pipeline steel seamless steel tube by using the phi 800 mm specification large round billet according to claim 1, wherein the annealing temperature is 580-680 ℃ during vacuum annealing.
7. The process for manufacturing the X80 pipeline steel seamless steel tube according to the round billet with the specification of phi 800 mm according to claim 6, wherein the annealing temperature is 650 ℃ during vacuum annealing.
8. The process for producing the X80 pipeline steel seamless steel tube by using the phi 800 mm large round billet according to claim 1, wherein the cold rolling deformation is 35-45%.
9. The process for molding the X80 pipeline steel seamless steel tube by using the phi 800 mm specification large round billet according to claim 1, wherein the diameter of the centering hole of the billet is 30-80 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011332291.6A CN112570487A (en) | 2020-11-24 | 2020-11-24 | Molding process for producing X80 pipeline steel seamless steel tube by adopting phi 800 mm large round billet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011332291.6A CN112570487A (en) | 2020-11-24 | 2020-11-24 | Molding process for producing X80 pipeline steel seamless steel tube by adopting phi 800 mm large round billet |
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| CN112570487A true CN112570487A (en) | 2021-03-30 |
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| CN202011332291.6A Pending CN112570487A (en) | 2020-11-24 | 2020-11-24 | Molding process for producing X80 pipeline steel seamless steel tube by adopting phi 800 mm large round billet |
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2020
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