CN111719085A - Marine vessel and method of making same - Google Patents
Marine vessel and method of making same Download PDFInfo
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- CN111719085A CN111719085A CN202010613241.9A CN202010613241A CN111719085A CN 111719085 A CN111719085 A CN 111719085A CN 202010613241 A CN202010613241 A CN 202010613241A CN 111719085 A CN111719085 A CN 111719085A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention provides a marine pipe and a manufacturing method thereof, belonging to the technical field of marine oil and gas exploration and development, the marine pipe comprises 0.05-0.12% of C, 0.2-0.35% of Si, 1.0-1.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0040% of S, 0.38-0.5% of Ni, and 0.10-0.35% of CrCu is less than or equal to 0.35 percent, Mo is 0.10-0.35 percent, Nb is 0.065-0.08 percent, V is 0.1-0.13 percent, Ti is 0.020-0.025 percent, N is 0.0020-0.0060 percent, Ca is 0.0005-0.0035 percent, Ti/N is 1.5-4.0 percent, and welding crack sensitivity index carbon equivalent CEPCMLess than or equal to 0.22. The marine pipe and the manufacturing method thereof reduce the failure risk of the marine pipe.
Description
Technical Field
The invention belongs to the technical field of marine oil and gas exploration and development, and particularly relates to a marine pipe and a manufacturing method thereof.
Background
As an important energy source, the proportion of petroleum and natural gas in the global energy structure is increasing, and the demand is increasing. The use of marine pipelines to form long-distance transportation pipelines through which oil and gas are transported from a production location to a customer destination is a safe, efficient and economical means of transportation, which has now become the primary means of onshore and offshore oil and gas transportation. However, as the line is long, once the marine pipe fails, the pollution influence caused by the failure is very large, and the performance of the existing marine pipe is low, so that the failure risk is high, and the pollution is easily caused.
Disclosure of Invention
The invention aims to provide an ocean tube and a manufacturing method thereof, and aims to solve the problems that the existing ocean tube is low in performance, high in failure risk and easy to cause pollution.
In order to achieve the purpose, the invention adopts the technical scheme that: the marine pipe comprises, by mass, 0.05-0.12% of C, 0.2-0.35% of Si, 1.0-1.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0040% of S, 0.38-0.5% of Ni, 0.10-0.35% of Cr, less than or equal to 0.35% of Cu, 0.10-0.35% of Mo, 0.065-0.08% of Nb, 0.1-0.13% of V, 0.020-0.025% of Ti, 0.0020-0.0060% of N, 0.0005-0.0035% of Ca, 1.5-4.0% of Ti/N, and the balance Fe and inevitable impurities, wherein the welding crack sensitivity index of the plate is carbon equivalent CEPCM≤0.22。
In another embodiment of the present invention, the structure of the plate material used for the marine pipe is mainly composed of polygonal ferrite and granular bainite, and the fraction of lath martensite is 2% or less.
The method for manufacturing the marine pipe comprises a steel plate automatic flaw detection process, a groove machining process, a pre-bending process, a forming process, a pre-welding process, an inner welding process, an outer welding process, a first ultrasonic automatic inspection process, a first pipe end ultrasonic manual inspection process, a first X-ray inspection process, a mechanical diameter expanding process, a pipe end machining process, a water pressure test process, a pipe end groove machining process, a second ultrasonic inspection process, a second X-ray inspection process, a second pipe end ultrasonic manual inspection process and appearance and size inspection.
In another embodiment of the application, in the groove processing procedure, the angle of the upper groove and the lower groove of the steel plate is 34.75-35 degrees, and the height of the upper groove is 6.5-6.7 mm; the height of the truncated edge is 4.8 mm-5.0 mm, and the angle is 2 degrees.
As another embodiment of the present application, the forming process adopts JCO forming, and first, a half of the steel plate after being pre-bent in the pre-bending process is pressed by a JCO forming machine for multiple times to form a "J" shape, then the other half of the steel plate is pressed by the same multiple times to form a "C" shape, and finally, the middle of the whole steel plate is pressed once to form an open "O" shape.
As another embodiment of the present application, the number of punching is 19, and the single rolling reduction is 190-200 mm.
As another embodiment of the application, the inner welding procedure and the outer welding procedure adopt three-wire submerged arc automatic welding to respectively weld the inner side welding groove and the outer side welding groove of the steel pipe, the diameter of a welding wire is 3.9-4.1 mm, and the welding speed is 1.55-1.6 m/min; the welding energy is 32 to 33 KJ/cm.
As another embodiment of the application, when the inner side of the steel pipe is welded, the first wire is in direct current reverse connection, the current is 950-1000A, and the voltage is 31-35V; the second wire is alternating current, the current is 800-900A, and the voltage is 35-39V; the third wire is alternating current with a current of 600-750A and a voltage of 38-42V.
As another embodiment of the application, when the outer side of the steel pipe is welded, the first wire is in direct current reverse connection, the current is 1000-1100A, and the voltage is 31-35V; the second wire is alternating current, the current is 800-900A, and the voltage is 35-39V; the third wire is alternating current, the current is 600-750A, and the voltage is 38-42V.
As another example of the present application, in the mechanical diameter expansion step, the entire length of the steel pipe is expanded by 0.8% to 1.2%.
The marine pipe provided by the invention has the beneficial effects that: compared with the prior art, the marine pipe adopts the plate components of, by mass, 0.05-0.12% of C, 0.2-0.35% of Si, 1.0-1.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0040% of S, 0.38-0.5% of Ni, 0.10-0.35% of Cr, less than or equal to 0.35% of Cu, 0.10-0.35% of Mo, 0.065-0.08% of Nb, 0.1-0.13% of V, 0.020-0.025% of Ti, 0.0020-0.0060% of N, 0.0005-0.0035% of Ca, 1.5-4.0% of Ti/N, and the balance of Fe and inevitable impurities, and the welding crack sensitivity index carbon equivalent CE of the platePCMLess than or equal to 0.22. The contents of Nb and Ni elements for preventing softening and embrittlement of a welding heat affected zone are increased, granular bainite is taken as a main microstructure, so that the welding performance is better during welding, the performance of the welded and manufactured marine pipe is better, and the failure risk of the marine pipe is reduced. According to the manufacturing method of the marine pipe, the marine pipe is manufactured by adopting the plate material, so that the performance of the marine pipe is better, and the failure risk of the marine pipe is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a method for manufacturing an ocean vessel according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The marine vessel and the method of manufacturing the same provided by the present invention will now be described. The marine pipe and the manufacturing method thereof, the marine pipe adopts the plate components of, by mass, 0.05-0.12% of C, 0.2-0.35% of Si, 1.0-1.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0040% of S, 0.38-0.5% of Ni, 0.10-0.35% of Cr, less than or equal to 0.35% of Cu, 0.10-0.35% of Mo, 0.065-0.08% of Nb, 0.1-0.13% of V, 0.020-0.025% of Ti, 0.0020-0.0060% of N, 0.0005-0.0035% of Ca, 1.5-4.0% of Ti/N, and the balance of Fe and inevitable impurities, and the welding crack sensitivity index carbon equivalent CE of the platePCM≤0.22。
Compared with the prior art, the marine pipe provided by the invention adopts the plate components of, by mass, 0.05-0.12% of C, 0.2-0.35% of Si, 1.0-1.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0040% of S, 0.38-0.5% of Ni, 0.10-0.35% of Cr, less than or equal to 0.35% of Cu, 0.10-0.35% of Mo, 0.065-0.08% of Nb, 0.1-0.13% of V, 0.020-0.025% of Ti, 0.0020-0.0060% of N, 0.0005-0.0035% of Ca, 1.5-4.0% of Ti/N, and the balance Fe and inevitable impurities, and the welding crack sensitivity index carbon equivalent CE of the platePCMLess than or equal to 0.22. Increase the prevention of softening and embrittlement of the weld heat affected zoneThe microstructure is mainly granular bainite, and the welding crack sensitivity index of the plate is carbon equivalent CEPCMLess than or equal to 0.22, the smaller the welding crack sensitivity index carbon equivalent of the plate, the less crack is easy to appear, the better the welding performance during welding is, the better the performance of the marine pipe manufactured by welding is, and the failure risk of the marine pipe is reduced.
In one embodiment, the structure of the plate used for the marine crude oil transport pipe is mainly composed of polygonal ferrite and granular bainite, and the fraction of lath martensite is 2% or less.
Example 1: the marine pipe comprises the following components in percentage by mass, 0.06% of C, 0.30% of Si, 1.40% of Mn, and P: 0.020%, S: 0.0010%, Ni 0.38%, Cr 0.11%, Cu: 0.3%, Mo 0.10%, Nb 0.065%, V0.1%, Ti 0.020%, N0.0020%, Ca 0.0005%, Ti/N1.5, and the balance Fe and inevitable impurities, and the weld crack sensitivity index carbon equivalent CE of the plate materialPCMIs 0.18.
Example 2: the marine pipe comprises the following components in percentage by mass, 0.09% of C, 0.22% of Si, 1.2% of Mn, and P: 0.01%, S: 0.0005%, Ni: 0.5%, Cr: 0.15%, Cu: 0.1%, 0.15% Mo, 0.08% Nb, 0.13% V, 0.025% Ti, 0.0060% N, 0.0035% Ca, 4.0% Ti/N, and the balance Fe and inevitable impurities, and the weld crack sensitivity index of the sheet material is CEPCMIs 0.20.
Example 3: the marine pipe comprises the following components in percentage by mass, 0.1% of C, 0.23% of Si, 1.3% of Mn, and P: 0.0005%, S: 0.0003%, 0.42% of Ni, 0.12% of Cr, Cu: 0.2% of Mo, 0.2% of Nb, 0.075% of V, 0.12% of Ti, 0.022% of N, 0.0040% of Ca, 0.0025% of Ti/N, 2% of Ti and inevitable impurities, and the balance Fe and inevitable impurities, and the welding crack sensitivity index of the plate material is carbon equivalent CEPCMIs 0.22.
Example 4: the marine pipe comprises the following components in percentage by mass of 0.11% of C, 0.3% of Si, 1.0% of Mn, and P: 0.0003%, S: 0.004%, Ni 0.45%, Cr 0.1%, Mo 0.3%, Nb 0.07%, V0.11%5%, Ti 0.023%, N0.0050%, Ca 0.0015%, Ti/N3, and the balance Fe and inevitable impurities, and the welding crack sensitivity index carbon equivalent CE of the plate materialPCMIs 0.21.
Referring to fig. 1, a method for manufacturing an ocean pipe includes a steel plate automatic flaw detection process, a groove preparation process, a pre-bending process, a forming process, a pre-welding process, an inner welding and outer welding process, a first ultrasonic automatic inspection, a first pipe end ultrasonic manual inspection, a first X-ray inspection, a mechanical diameter expanding process, a pipe end processing process, a water pressure test, a pipe end groove preparation process, a second ultrasonic inspection, a second X-ray inspection, a second pipe end ultrasonic manual inspection, and an appearance and dimension inspection.
The method for manufacturing the ocean tube has the advantages that: compared with the prior art, the marine pipe is made of the plate material, so that the performance of the marine pipe is better, and the failure risk of the marine pipe is reduced.
As a specific implementation manner of the embodiment of the invention, in the groove processing procedure, the angle of the upper groove and the lower groove of the steel plate is 34.75-35 degrees, and the height of the upper groove is 6.5-6.7 mm; the height of the truncated edge is 4.8 mm-5.0 mm, and the angle is 2 degrees.
As a specific implementation manner of the embodiment of the invention, the forming process adopts JCO forming, firstly, a JCO forming machine is used to perform multiple punching on one half of the steel plate after being pre-bent in the pre-bending process to form a "J" shape, then the other half of the steel plate is performed with the same multiple punching to form a "C" shape, and finally, the middle of the whole steel plate is pressed once to form an opened "O" shape.
As a specific implementation manner of the embodiment of the invention, the stamping times are 19 times, and the single pressing amount is 190-200 mm.
As a specific implementation manner of the embodiment of the invention, three-wire submerged arc automatic welding is adopted in the inner welding process and the outer welding process to respectively weld the inner side welding groove and the outer side welding groove of the steel pipe, the diameter of a welding wire is 3.9-4.1 mm, and the welding speed is 1.55-1.6 m/min; the welding energy is 32 to 33 KJ/cm.
As a specific implementation manner of the embodiment of the invention, when the inner side of the steel pipe is welded, the first wire is in direct current reverse connection, the current is 950-1000A, and the voltage is 31-35V; the second wire is alternating current, the current is 800-900A, and the voltage is 35-39V; the third wire is alternating current with a current of 600-750A and a voltage of 38-42V.
As a specific implementation manner of the embodiment of the invention, when the outer side of the steel pipe is welded, the first wire is in direct current reverse connection, the current is 1000-1100A, and the voltage is 31-35V; the second wire is alternating current, the current is 800-900A, and the voltage is 35-39V; the third wire is alternating current, the current is 600-750A, and the voltage is 38-42V.
As a specific embodiment of the present invention, the total length of the steel pipe is expanded by 0.8 to 1.2% in the mechanical expanding step.
One embodiment of the method for manufacturing the marine vessel is as follows:
(1) automatic flaw detection: and (3) utilizing full-automatic steel plate ultrasonic flaw detection equipment to perform 100% inspection on the steel plate within 75mm of the two side plate edges and the middle part.
(2) Groove processing procedure: the upper and lower bevel angles of the steel plate are both smaller bevel angles of 35 degrees, and the height of the truncated edge is 4.8 mm. The purpose of processing the groove is to ensure that the welding process can be completely welded through, form a proper welding seam appearance, avoid the defects of incomplete welding and the like in the high-speed welding process and ensure the quality of a welding joint.
(3) Pre-bending: and bending the plate edges by adopting a pre-edge bending machine.
(4) A molding procedure: firstly, a JCO forming machine is utilized to carry out multiple stamping on one half of a steel plate which is subjected to edge pre-bending in a pre-bending process, the half of the steel plate is pressed into a J shape, the other half of the steel plate is also subjected to the same multiple stamping, the other half of the steel plate is pressed into a C shape, and finally, the middle of the whole steel plate is pressed once to form an open O shape; the above-mentioned pressing was carried out 19 times at a single reduction of 190-200 mm.
(5) A prewelding procedure: the position of the press roller of the joint-closing pre-welding machine is adjusted, so that the welding grooves of the formed steel pipes are well matched together, and meanwhile, a gas shielded welding mode is adopted for welding, thereby laying a foundation for subsequent inner welding and outer welding procedures.
(6) Inner welding and outer welding: adopting three-wire submerged arc automatic welding to weld the inner side and the outer side welding grooves of the steel pipe, wherein the diameter of a welding wire is 3.9-4.1 mm, and the welding speed is 1.55-1.6 m/min; the welding energy is 32 to 33 KJ/cm.
When the inner side of the steel pipe is welded, the first wire is in direct current reverse connection, the current is 950-1000A, and the voltage is 31-35V, preferably 33V; the second wire is alternating current, the current is 800-900A, the voltage is 35-39V, and the optimal voltage is 37V; the third wire is alternating current, the current is 600-750A, the voltage is 38-42V, and 40V is preferred.
When the outer side of the steel pipe is welded, the first wire is in direct current reverse connection, the current is 1000-1100A, the voltage is 31-35V, and the optimal voltage is 33V; the second wire is alternating current, the current is 800-900A, the voltage is 35-39V, and the optimal voltage is 37V; the third wire is alternating current, the current is 600-750A, the voltage is 38-42V, and 40V is preferred.
(7) Automatic ultrasonic inspection for the first time: ultrasonic inspection is carried out on the welded steel pipe inner and outer welding seams and heat affected zone parts on two sides of the welding seams;
(8) first tube end ultrasonic manual inspection: carrying out manual ultrasonic inspection on the welding line within 300mm of the pipe end and the areas on two sides of the welding line;
(9) first X-ray examination: and an image processing system is adopted to carry out 100% industrial television inspection on the welded inner and outer welding seams of the steel pipe, so that the flaw detection sensitivity is ensured.
(10) Mechanical expanding process: the diameter of the whole length of the steel pipe is expanded by 0.8-1.2% to improve the accuracy of the appearance dimension of the steel pipe, such as ovality and straightness, and improve the internal stress distribution state of the steel pipe.
(11) A pipe end machining procedure: and (4) processing the end face of the steel pipe to ensure the flatness.
(12) And (3) hydrostatic test: the steel pipe is subjected to a hydrostatic pressure test at 100%, the test pressure is 90% -100% of the specified minimum yield strength, and the strength level and the presence or absence of a leakage point of the steel pipe are checked.
(13) The pipe end groove machining process comprises the following steps: and (4) processing the pipe end of the steel pipe qualified by inspection to meet the pipe end groove size requirement required by a customer.
(14) And (3) second ultrasonic inspection: and (3) carrying out 100% inspection on the inner and outer welding seams of the steel pipe after expanding and water pressure and heat affected zone parts on two sides of the welding seams to eliminate defects possibly generated by expanding and water pressure.
(15) Second X-ray examination: and (3) carrying out 100% industrial television inspection and pipe end shooting inspection on the inner and outer welding seams of the steel pipe after expanding and water pressure, so as to eliminate defects possibly generated by expanding and water pressure.
(16) And (3) second ultrasonic manual inspection of the pipe end: and (3) inspecting the pipe body, the welding seam, the heat affected zone part on two sides of the welding seam and the bevel face within the range of 300mm of the pipe end.
(17) And (5) checking appearance and size.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The marine pipe is characterized in that the marine pipe adopts plate components comprising, by mass, 0.05-0.12% of C, 0.2-0.35% of Si, 1.0-1.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0040% of S, 0.38-0.5% of Ni, 0.10-0.35% of Cr, less than or equal to 0.35% of Cu, 0.10-0.35% of Mo, 0.065-0.08% of Nb, 0.1-0.13% of V, 0.020-0.025% of Ti, 0.0020-0.0060% of N, 0.0005-0.0035% of Ca, 1.5-4.0% of Ti/N, and the balance of Fe and inevitable impurities, and the welding crack sensitivity index carbon equivalent CE of the platePCM≤0.22。
2. The marine pipe according to claim 1, wherein the structure of the plate used in the marine pipe is mainly composed of polygonal ferrite and granular bainite, and the fraction of lath martensite is 2% or less.
3. A method for manufacturing an ocean tube according to any one of claims 1 to 2, comprising a steel plate automatic flaw detection process, a groove preparation process, a preflex process, a forming process, a prefluxing process, an inside and outside welding process, a first ultrasonic automatic inspection, a first pipe end ultrasonic manual inspection, a first X-ray inspection, a mechanical diameter expanding process, a pipe end preparation process, a water pressure test, a pipe end groove preparation process, a second ultrasonic inspection, a second X-ray inspection, a second pipe end ultrasonic manual inspection, and an appearance and dimension inspection.
4. The method for manufacturing the marine pipe according to claim 3, wherein in the beveling process, the angle of the upper and lower bevels of the steel plate is 34.75 to 35 degrees, and the height of the upper bevel is 6.5 to 6.7 mm; the height of the truncated edge is 4.8 mm-5.0 mm, and the angle is 2 degrees.
5. The method for manufacturing the marine pipe as claimed in claim 3, wherein the forming process adopts JCO forming, firstly, a JCO forming machine is used for punching a half of the steel plate which is pre-bent in the pre-bending process for multiple times to form a J shape, then the other half of the steel plate is punched for the same multiple times to form a C shape, and finally, the middle of the whole steel plate is pressed once to form an open O shape.
6. The method for manufacturing an ocean tube according to claim 5, wherein the number of punching is 19, and the single rolling reduction is 190-200 mm.
7. The method for manufacturing the marine pipe according to claim 3, wherein the inner welding and the outer welding are performed by three-wire submerged arc automatic welding to weld the inner side welding groove and the outer side welding groove of the steel pipe respectively, the diameter of a welding wire is 3.9-4.1 mm, and the welding speed is 1.55-1.6 m/min; the welding energy is 32 to 33 KJ/cm.
8. The method for manufacturing an ocean tube according to claim 7, wherein when welding the inner side of the steel tube, the first wire is in direct current reverse connection, the current is 950-1000A, and the voltage is 31-35V; the second wire is alternating current, the current is 800-900A, and the voltage is 35-39V; the third wire is alternating current with a current of 600-750A and a voltage of 38-42V.
9. The method for manufacturing an ocean tube according to claim 7, wherein when the outer side of the steel tube is welded, the first wire is in direct current reverse connection, the current is 1000-1100A, and the voltage is 31-35V; the second wire is alternating current, the current is 800-900A, and the voltage is 35-39V; the third wire is alternating current, the current is 600-750A, and the voltage is 38-42V.
10. The method for manufacturing an ocean tube according to claim 3, wherein the mechanical expanding step expands the entire length of the steel tube by 0.8 to 1.2%.
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| CN202010613241.9A CN111719085A (en) | 2020-06-30 | 2020-06-30 | Marine vessel and method of making same |
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| CN202010613241.9A CN111719085A (en) | 2020-06-30 | 2020-06-30 | Marine vessel and method of making same |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1516934A1 (en) * | 2002-06-19 | 2005-03-23 | Nippon Steel Corporation | Oil well steel pipe excellent in crushing resistance characteristics after pipe expansion |
| JP2007119861A (en) * | 2005-10-28 | 2007-05-17 | Nippon Steel Corp | Method for producing high tensile-strength steel for welding structure excellent in high temperature strength and low temperature toughness |
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