CN112575253A - X80M steel material and X80M steel pipe for longitudinal submerged arc welding and preparation method thereof - Google Patents
X80M steel material and X80M steel pipe for longitudinal submerged arc welding and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 238000003466 welding Methods 0.000 title claims abstract description 103
- 239000000463 material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000003801 milling Methods 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052796 boron Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 238000003754 machining Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 38
- 238000007689 inspection Methods 0.000 claims description 36
- 230000008569 process Effects 0.000 claims description 35
- 238000003825 pressing Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 230000002706 hydrostatic effect Effects 0.000 claims description 4
- 239000006247 magnetic powder Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 239000000956 alloy Substances 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 238000005098 hot rolling Methods 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
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- 230000005540 biological transmission Effects 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
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- 238000012986 modification Methods 0.000 description 3
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
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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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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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
- C21D2211/005—Ferrite
Abstract
The embodiment of the invention discloses an X80M steel material and an X80M steel pipe for longitudinal submerged arc welding and a preparation method thereof, wherein the steel material comprises C, Si, Mn, P, S, Nb, V, Ti, Al, N, Cu, Cr, Mo, Ni, B and Fe. The preparation method of the steel pipe comprises the following steps: the hot rolled steel plate made of the steel material is subjected to edge milling, edge pre-bending, steel plate forming, welding, mechanical diameter expanding, chamfering and groove machining in sequence. According to the invention, through adjusting the alloy components of the X80M steel material, combining the preparation of the steel plate by adopting a hot rolling mode and controlling the microstructure of the steel plate, the steel plate obtained by the material and the hot rolling mode has good yield ratio, DWTT and other properties, and further the X80M longitudinal submerged arc welded steel pipe with the diameter of phi 1422mm and the wall thickness of 38.5mm can be effectively suitable for the requirements of four types of areas.
Description
Technical Field
The embodiment of the invention relates to the field of longitudinal submerged arc welding materials, in particular to an X80M steel material and an X80M steel pipe for longitudinal submerged arc welding and a preparation method thereof.
Background
The pipeline transportation has the advantages of large transportation amount, continuity, rapidness, economy, safety, reliability, stability, less investment, small occupied area, low cost and the like, is the most economical and reasonable transportation mode for long-distance transportation of oil and natural gas, and is a development trend to adopt large-diameter, high-pressure and high-steel-grade pipelines in order to meet the transportation process requirements of the natural gas with the ultra-large transportation amount. Because the main natural gas production area in China is located in the western area of China, and most natural gas users are located in the eastern area with dense population, when laying natural gas transmission pipelines, the natural gas transmission pipelines inevitably pass through four areas with dense population, frequent traffic and many underground facilities, and therefore, the safety and the reliability of the natural gas transmission pipelines in the four areas are usually effectively ensured by improving the steel-grade strength and the wall thickness.
At present, a longitudinal submerged arc welded pipe with the specification of phi 1422 multiplied by 30.8mm in X80 steel is applied to middle and Russian east line pipeline construction, and the 1422mm caliber in the specification is also the oil and gas transmission welded pipe with the largest caliber in China and even all over the world at present. In the construction engineering of X80 steel-grade large-caliber large-wall-thickness pipelines which are built abroad, the most typical construction method is the construction of a Russian Paifu Kowa-Uqia K65(X80) natural gas pipeline, the maximum caliber of the pipeline is 1420mm, the maximum wall thickness of the pipeline is 33.4mm, and the pipeline is an X80 steel-grade welded pipe with the largest pipe diameter and the largest wall thickness in a foreign oil and gas transmission pipeline. In conclusion, in both domestic and foreign countries, especially for the phi 1422X 38.5mm longitudinal submerged arc welded pipe, the caliber and the wall thickness of the X80 steel grade longitudinal submerged arc welded steel pipe are improved by a new height, so that new challenges are provided for improving the equipment capacity and developing the process.
Disclosure of Invention
Therefore, the embodiment of the invention provides an X80M steel material for longitudinal submerged arc welding, an X80M steel pipe and a preparation method thereof, and the steel pipe and the preparation method thereof enable the welding seam, the low-temperature impact toughness of the hot zone and the DWTT performance of the longitudinal submerged arc welding pipe with the phi 1422 multiplied by 38.5mm specification prepared by the materials and the method to meet the use requirements of four regions by combining the reasonable proportion of alloy components and the selection of rolling parameters.
In order to achieve the above object, an embodiment of the present invention provides the following:
in one aspect of an embodiment of the present invention, there is provided an X80M steel material for longitudinal submerged arc welding, comprising C, Si, Mn, P, S, Nb, V, Ti, Al, N, Cu, Cr, Mo, Ni, B, and Fe.
In a preferred embodiment of the present invention, based on the total weight of the X80M steel material, the content of C is not more than 0.07 wt%, the content of Si is not more than 0.30 wt%, the content of Mn is not more than 1.80 wt%, the content of P is not more than 0.015 wt%, the content of S is not more than 0.005 wt%, the content of Nb is 0.040 to 0.080 wt%, the content of V is not more than 0.030 wt%, the content of Ti is not more than 0.025 wt%, the content of Al is not more than 0.06 wt%, the content of N is not more than 0.008 wt%, the content of Cu is not more than 0.3 wt%, the content of Cr is not more than 0.30 wt%, the content of Mo is 0.08 to 0.30 wt%, the content of Ni is 0.10 to 0.30 wt%, the content of B is not more than 0.0005 wt%, and the.
As a preferable mode of the invention, Pcm of the X80M steel material is not more than 0.22.
In another aspect of the embodiments of the present invention, there is also provided a method for preparing an X80M steel pipe for longitudinal submerged arc welding, comprising: the steel plate is subjected to edge milling, edge pre-bending, steel plate forming, welding, mechanical diameter expanding, chamfering and groove processing in sequence to form a longitudinal submerged arc welding steel pipe; wherein the content of the first and second substances,
the material of the steel sheet is the X80M steel material described above, and the steel sheet is a hot-rolled steel sheet.
As a preferable scheme of the invention, in the edge milling process, the height of the upper groove is 13.5-14.5 mm, and the thickness of the truncated edge is 11.0-12.0 mm.
According to a preferable scheme of the invention, the steel plate forming process is JCO forming, in the JCO forming process, the pressing pass is 25-28 times, and the rolling reduction of each pressing is 580-590 mm.
In a preferred embodiment of the present invention, the welding process includes a pre-welding, an inner welding and an outer welding which are sequentially performed.
According to a preferred scheme of the invention, the inner welding process is to automatically weld a welding groove at the inner side of the steel pipe formed after the steel plate forming process by adopting four-wire submerged arc welding, the first wire adopts direct current reverse connection, and the second wire, the fourth wire and the fourth wire are alternating current; the steel pipe welding process parameters are as follows: the current value of the first wire is 1100-1200A, and the voltage value is 32-35V; the current value of the second wire is 800-900A, and the voltage value is 34-38V; the current value of the third wire is 700-800A, and the voltage value is 36-40V; the current value of the fourth wire is 600-700A, and the voltage value is 40-44V; the spacing between the welding wires is 16-20 mm, the welding speed is 70-110 cm/min, and the linear energy is 75-85 KJ/cm.
According to a preferred scheme of the invention, the outer welding process is to automatically weld a welding groove at the outer side of the steel pipe formed after the steel plate forming process by adopting four-wire submerged arc welding, the first wire adopts direct current reverse connection, and the second wire, the fourth wire and the fourth wire are alternating current; the steel pipe welding process parameters are as follows: the current value of the first wire is 1100-1200A, and the voltage value is 32-35V; the current value of the second wire is 800-900A, and the voltage value is 34-38V; the current value of the third wire is 700-800A, and the voltage value is 36-40V; the current value of the fourth wire is 600-700A, and the voltage value is 40-44V; the distance between the welding wires is 16-20 mm, the welding speed is 65-95 cm/min, and the linear energy is 80-90 KJ/cm.
As a preferable aspect of the present invention, the manufacturing method further includes an inspection process, and the inspection process includes at least a primary inspection between the welding and the mechanical expanding, a hydrostatic test provided between the mechanical expanding and the chamfering, and a secondary inspection, a pipe end magnetic powder inspection, and an appearance quality inspection sequentially provided after the groove machining; and the number of the first and second electrodes,
the primary inspection comprises a first ultrasonic inspection and a first X-ray inspection which are sequentially arranged;
the secondary inspection includes a second ultrasonic inspection and a second X-ray inspection arranged in sequence.
In another aspect of the embodiment of the invention, the X80M steel pipe for longitudinal submerged arc welding is also provided, and is prepared according to the preparation method.
In a preferred embodiment of the present invention, the ferrite content in the weld microstructure of the X80M steel pipe is greater than 85%.
The embodiment of the invention has the following advantages:
by adjusting the alloy components of the X80M steel material, preparing a steel plate by combining a hot rolling mode and controlling the microstructure of the steel plate, the steel plate obtained by the material and the hot rolling mode has good yield ratio, DWTT and other properties, and the X80M longitudinal submerged arc welded steel pipe with the diameter of phi 1422mm and the wall thickness of 38.5mm can be effectively suitable for the requirements of four types of areas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a surface photomicrograph of a steel sheet obtained in example 1 of the present invention;
FIG. 2 is a central microscopic metallographic photograph of a steel sheet obtained in example 1 of the present invention;
FIG. 3 is a photomicrograph of the steel sheet obtained in example 1 of the present invention at the position 1/4;
FIG. 4 is a photomicrograph of the weld joint of the steel pipe obtained in example 2 of the present invention;
FIG. 5 is a photomicrograph of the heat-affected zone of the steel pipe obtained in example 2 of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specifically, the invention provides an X80M steel material for longitudinal submerged arc welding, which comprises C, Si, Mn, P, S, Nb, V, Ti, Al, N, Cu, Cr, Mo, Ni, B and Fe, wherein based on the total weight of the X80M steel material, the content of C is not more than 0.07 wt%, the content of Si is not more than 0.30 wt%, the content of Mn is not more than 1.80 wt%, the content of P is not more than 0.015 wt%, the content of S is not more than 0.005 wt%, the content of Nb is 0.040-0.080 wt%, the content of V is not more than 0.030 wt%, the content of Ti is not more than 0.025 wt%, the content of Al is not more than 0.06 wt%, the content of N is not more than 0.008 wt%, the content of Cu is not more than 0.3 wt%, the content of Cr is not more than 0.30 wt%, the content of Mo is 0.08-0.30 wt%, the content of Ni is 0.10-0.30 wt%, and the content of B is not more than 0.0005, the balance being Fe, and the Pcm of the X80M steel material is not more than 0.22.
The invention also provides a preparation method of the X80M steel pipe for longitudinal submerged arc welding, and the whole preparation method specifically comprises the following steps of sequentially carrying out the following steps on a hot rolled steel plate prepared from the X80M steel material: the method comprises the following steps of edge milling, edge pre-bending, JCO forming, pre-welding, inner welding, outer welding, first ultrasonic inspection, first X-ray inspection, mechanical diameter expanding, hydrostatic testing, chamfering, groove machining, second ultrasonic inspection, second X-ray inspection, pipe end magnetic powder inspection and appearance quality inspection.
Specifically, in the edge milling process, the height of the upper groove is 13.5-14.5 mm, and the thickness of the truncated edge is 11.0-12.0 mm. By reasonably designing the groove size, the problem that the toughness of a hot zone is poor due to coarse grains in secondary thermal cycle during welding is effectively solved, and the impact toughness of the hot zone is ensured.
Furthermore, in the JCO forming process, the pressing pass is 25-28 times, the preferable pressing pass is 27 times, and the reduction amount of each pressing is 580-590 mm.
Meanwhile, in the invention, the inner welding process adopts four-wire submerged arc automatic welding to weld the inner side welding groove of the steel pipe formed after the steel plate forming process, the first wire adopts direct current reverse connection, and the second to fourth wires are alternating current; the steel pipe welding process parameters are as follows: the current value of the first wire is 1100-1200A, and the voltage value is 32-35V; the current value of the second wire is 800-900A, and the voltage value is 34-38V; the current value of the third wire is 700-800A, and the voltage value is 36-40V; the current value of the fourth wire is 600-700A, and the voltage value is 40-44V; the distance between the welding wires is 16-20 mm, the welding speed is 70-110 cm/min, and the linear energy is 75-85 KJ/cm; the outer welding process is to automatically weld a welding groove at the outer side of the steel pipe formed after the steel plate forming process by adopting four-wire submerged arc welding, the first wire adopts direct current reverse connection, and the second wire, the fourth wire and the fourth wire are alternating current; the steel pipe welding process parameters are as follows: the current value of the first wire is 1100-1200A, and the voltage value is 32-35V; the current value of the second wire is 800-900A, and the voltage value is 34-38V; the current value of the third wire is 700-800A, and the voltage value is 36-40V; the current value of the fourth wire is 600-700A, and the voltage value is 40-44V; the distance between the welding wires is 16-20 mm, the welding speed is 65-95 cm/min, and the linear energy is 80-90 KJ/cm.
According to the mode, the current, the voltage, the angle, the welding wire interval and the welding speed of each wire in the inner welding process and the outer welding process are reasonably set, so that the welding seam obtains proper penetration depth and a good welding seam shape, and the welding seam and a parent metal are in smooth transition, so that the welding seam is finally formed into a welding seam tissue which mainly comprises acicular ferrite and has good mechanical property, and the obdurability matching of a welding joint of a welded pipe is ensured.
The invention also provides an X80M steel pipe for longitudinal submerged arc welding prepared by the preparation method, and the ferrite content in the weld microstructure of the X80M steel pipe is more than 85%.
The following is further illustrated by specific examples.
Example 1
Providing an X80M controlled rolling steel plate made of an X80M steel material, wherein the width of the X80M controlled rolling steel plate is 4325mm, the thickness of the X80M controlled rolling steel plate is 38.5mm, and the weight percentages of the components except Fe and CEpcmThe values are shown in Table 1, with the balance being Fe. The obtained microscopic metallographic images of the steel sheet at the respective positions are shown in FIGS. 1 to 3.
TABLE 1
Example 2
An X80M controlled rolling steel plate in example 1 was used as a base material, and an X80M longitudinal submerged arc welded steel pipe having a diameter of 1422mm and a thickness of 38.5mm was obtained by milling, prebending, JCO forming, prewelding, inner welding, outer welding, first ultrasonic inspection, first X-ray inspection, mechanical diameter expansion, hydrostatic test, chamfering, groove processing, second ultrasonic inspection, second X-ray inspection, pipe end magnetic powder inspection, and appearance quality inspection. Wherein the content of the first and second substances,
in the edge milling step, the angles of the upper and lower grooves are both 30 degrees, the height of the upper groove is 14.0mm, and the thickness of the truncated edge is 11.5 mm.
In the JCO forming step: the whole pressing pass is 27 passes, and the reduction amount is 585 mm.
In the inner welding step: adopting four-wire submerged arc automatic welding to weld the welding groove at the inner side of the steel pipe, wherein the used welding wire is H08MnMoTiB, and the welding process parameters are as follows: the welding wire comprises a first wire current 1150A, a voltage 32V, a second wire current 850A, a voltage 36V, a third wire current 750A, a voltage 38V, a fourth wire current and a voltage 40V, the welding wire interval is 18mm, the welding speed is 90cm/min, and the welding wire energy is 79.93 kJ/cm.
In the outer welding step: adopting four-wire submerged arc automatic welding to weld the welding groove at the outer side of the steel pipe, wherein the used welding wire is H08MnMoTiB, and the welding process parameters are as follows: the welding wire comprises a first wire current 1150A, a voltage 32V, a second wire current 850A, a voltage 36V, a third wire current 750A, a voltage 38V, a fourth wire current and a voltage 40V, the welding wire interval is 18mm, the welding speed is 85cm/min, and the welding wire energy is 84.64 kJ/cm.
The mass percentage of the chemical components of the obtained welding seam is C: 0.053%, Mn: 1.634%, Si: 0.30%, P: 0.010%, S: 0.0015%, Mo: 0.200%, Ni: 0.222%, Cr: 0.111%, Cu: 0.125%, V: 0.003%, Nb: 0.033%, Ti: 0.013%, Al: 0.009%, N: 0.003%, B: 0.0005 percent, the balance being Fe, Pcm being 0.18, and the microstructure of the welding line being that the content of acicular ferrite is more than 85 percent. The obtained microscopic metallographic images of the weld and the heat affected zone of the steel pipe are shown in fig. 4 and 5.
Example of detection
The DWTT performance of the X80M controlled rolled steel sheet of example 1 was tested and the results are shown in table 2; the CVN performance of the X80M controlled rolled steel sheets was tested and the results are shown in table 3.
The charpy impact properties of the base material, the weld, and the hot zone of the steel pipe in example 2 were measured, and the results are shown in table 4; tensile test tests were performed on the welded joint between the steel pipe base metal and the welded steel pipe in example 2, and the results are shown in table 5; the DWTT performance of the steel pipe base material in example 2 at-5 ℃ was tested, and the results are shown in table 6; the joint hardness of the welded joints of steel pipes was measured (and numbered sequentially from 1 to 14 according to the measured positions), and the results are shown in table 7, in which the data in the fourth row in table 7 are hardness measurement results corresponding one-to-one to the position numbers of the third row.
TABLE 2
TABLE 3
TABLE 4
TABLE 5
TABLE 6
TABLE 7
As can be seen from table 2, by optimizing the alloy components, the average value of the shear area rate of the X80M controlled rolling steel plate prepared in example 1 of the present invention reaches 40% or more, and the shear area rate of each sample reaches 50% or more, which meets the requirements of four types of regions on the steel pipe base metal; as can be seen from Table 3, the average value of the Charpy impact energy of the X80M controlled rolled steel plate of the invention reaches more than 200J, and the Charpy impact energy of each sample reaches more than 150J; the average value of the shearing area rate reaches more than 85 percent, the shearing area rate of each sample reaches more than 70 percent, and the requirements of four types of regions on the steel pipe parent metal are met.
Further, in order to ensure safe use of the steel pipe in four types of areas, according to requirements, the average minimum requirement of the shearing area of the DWTT test (drop weight tear test) of the steel pipe is 85% and the single minimum requirement is 70% under the condition that the temperature is-5 ℃; the CVN test (charpy impact test) temperature of the weld and hot zone was-10 ℃, the minimum requirement for the average of 3 samples absorbing energy was 80J, and the individual minimum requirement was 60J.
Based on this, it can be seen from the data in tables 2 to 7 that the steel sheets obtained according to the invention have an average value of 80% or more in DWTT (-15 ℃) shear area ratio and 370J or more in Charpy impact energy (-20 ℃) ratio. The average value of the Charpy impact energy (-10 ℃) of a longitudinal submerged arc welding steel pipe base material is more than 330J, the average value of the Charpy impact energy (-10 ℃) of a welding seam is more than 165J, and the average value of the Charpy impact energy (-10 ℃) of a heat affected zone (namely a hot zone) is more than 230J; the average value of the DWTT (-5 ℃) shearing area rate of the parent metal is more than 90 percent, and the mechanical properties of the DWTT (-5 ℃) shearing area rate of the parent metal meet the requirements of four regions.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. An X80M steel material for longitudinal submerged arc welding, which is characterized by comprising C, Si, Mn, P, S, Nb, V, Ti, Al, N, Cu, Cr, Mo, Ni, B and Fe.
2. The steel material X80M according to claim 1, wherein based on the total weight of the steel material X80M, the steel material has a C content of not more than 0.07 wt%, a Si content of not more than 0.30 wt%, a Mn content of not more than 1.80 wt%, a P content of not more than 0.015 wt%, a S content of not more than 0.005 wt%, a Nb content of 0.040-0.080 wt%, a V content of not more than 0.030 wt%, a Ti content of not more than 0.025 wt%, an Al content of not more than 0.06 wt%, a N content of not more than 0.008 wt%, a Cu content of not more than 0.3 wt%, a Cr content of not more than 0.30 wt%, a Mo content of 0.08-0.30 wt%, a Ni content of 0.10-0.30 wt%, a B content of not more than 0.0005 wt%, and the balance Fe.
3. The steel material X80M according to claim 1 or 2, wherein the Pcm of the steel material X80M is not more than 0.22.
4. A preparation method of an X80M steel pipe for longitudinal submerged arc welding is characterized by comprising the following steps: the steel plate is subjected to edge milling, edge pre-bending, steel plate forming, welding, mechanical diameter expanding, chamfering and groove processing in sequence to form a longitudinal submerged arc welding steel pipe; wherein the content of the first and second substances,
the material of the steel sheet is the X80M steel material according to any one of claims 1-3, and the steel sheet is a hot rolled steel sheet.
5. A preparation method according to claim 4, wherein the height of the upper groove is 13.5-14.5 mm and the thickness of the truncated edge is 11.0-12.0 mm during the edge milling process.
6. A preparation method according to claim 4 or 5, characterized in that the steel plate forming process is JCO forming, and in the JCO forming process, the pressing passes are 25-28 times, and the reduction of each pressing is 580-590 mm.
7. A manufacturing method according to claim 4 or 5, wherein the welding process includes a pre-weld, an inner weld, and an outer weld, which are arranged in sequence;
preferably, the inner welding process is to automatically weld the inner side welding groove of the steel pipe formed after the steel plate forming process by adopting four-wire submerged arc welding, the first wire adopts direct current reverse connection, and the second wire, the fourth wire and the fourth wire are alternating current; the steel pipe welding process parameters are as follows: the current value of the first wire is 1100-1200A, and the voltage value is 32-35V; the current value of the second wire is 800-900A, and the voltage value is 34-38V; the current value of the third wire is 700-800A, and the voltage value is 36-40V; the current value of the fourth wire is 600-700A, and the voltage value is 40-44V; the distance between the welding wires is 16-20 mm, the welding speed is 70-110 cm/min, and the linear energy is 75-85 KJ/cm;
further preferably, the outer welding process is to weld the outer welding groove of the steel pipe formed after the steel plate forming process by adopting four-wire submerged arc automatic welding, the first wire adopts direct current reverse connection, and the second to fourth wires are alternating current; the steel pipe welding process parameters are as follows: the current value of the first wire is 1100-1200A, and the voltage value is 32-35V; the current value of the second wire is 800-900A, and the voltage value is 34-38V; the current value of the third wire is 700-800A, and the voltage value is 36-40V; the current value of the fourth wire is 600-700A, and the voltage value is 40-44V; the distance between the welding wires is 16-20 mm, the welding speed is 65-95 cm/min, and the linear energy is 80-90 KJ/cm.
8. A production method according to claim 4 or 5, further comprising an inspection process, and the inspection process includes at least a primary inspection between the welding and the mechanical expanding, a hydrostatic test provided between the mechanical expanding and the chamfering, and a secondary inspection, a pipe end magnetic powder inspection, and an appearance quality inspection sequentially provided after the groove machining; and the number of the first and second electrodes,
the primary inspection comprises a first ultrasonic inspection and a first X-ray inspection which are sequentially arranged;
the secondary inspection includes a second ultrasonic inspection and a second X-ray inspection arranged in sequence.
9. An X80M steel pipe for longitudinal submerged arc welding, characterized in that it is produced by the production method according to any one of claims 4 to 8.
10. The X80M steel tube of claim 9, wherein the weld microstructure in the X80M steel tube has a ferrite content of greater than 85%.
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