Spiral submerged arc welded pipe for hydrogen transport pipeline, and preparation method therefor

Abstract

A spiral submerged arc welded pipe for a hydrogen transport pipeline, and a preparation method therefor. The preparation method comprises: (1) uncoiling an X52MS hot-rolled plate coil to obtain a steel strip, wherein the X52MS hot-rolled plate contains, in percentage by mass, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, and CEPcm≤0.16; (2) performing edge milling on edges of the steel strip, such that welding grooves may be formed on the edge-milled steel strip after same is coiled; (3) coiling the edge-milled steel strip to obtain a spiral cylinder; and (4) using special hydrogen-resistant welding wires to weld the spiral cylinder by means of a double-wire tandem automatic submerged arc welding process, so as to obtain a spiral submerged arc welded pipe for a hydrogen transport pipeline. Thus, a spiral submerged arc welded pipe for a hydrogen transport pipeline that has good weldability, good comprehensive mechanical properties and high hydrogen resistance can be manufactured.

Description

Spiral submerged arc welded pipe for hydrogen transmission pipeline and preparation method thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application 202311521974.X filed on November 15, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] The invention relates to the technical field of spiral submerged arc welded pipe manufacturing, and in particular to a spiral submerged arc welded pipe for a hydrogen transmission pipeline and a preparation method thereof. Background Art

[0004] Hydrogen energy is a green, efficient, and sustainable secondary energy source, and one of the most ideal new energy sources. The "China Hydrogen Energy and Fuel Cell Industry White Paper" clearly states that by 2050, hydrogen energy will account for 10% of China's final energy consumption, complementing electricity. By then, carbon dioxide emissions will be reduced by 700 million tons annually, and the cumulative economic output will be boosted by 33 trillion yuan. The "China Hydrogen Energy Industry Infrastructure Development Blue Paper," jointly released by the China National Institute of Standardization and the National Hydrogen Energy Standardization Technical Committee, defines the development goals and key tasks of my country's hydrogen energy industry infrastructure. It projects that by 2030, over 3,000 km of long-distance hydrogen pipelines will be built.

[0005] Currently, my country's steel, caustic soda, and other industries emit over 50 billion cubic meters of hydrogen as a byproduct annually. This discarded hydrogen can be used as a clean energy source through hydrogen production processes. One approach is to purify the hydrogen and use it in fuel cells. Another approach is to blend it into existing natural gas pipeline systems for fuel cell use. Therefore, the transportation of pure hydrogen or the use of existing natural gas pipelines for hydrogen blending will be a future trend in natural gas pipeline development.

[0006] Spiral submerged arc welded pipe is currently the primary type of pipe used in pipeline transportation. There is an urgent need to develop a series of products that can adapt to hydrogen transmission conditions to meet the future needs of domestic hydrogen pipeline construction. Currently, the technical difficulty in manufacturing spiral submerged arc welded pipe for hydrogen pipelines lies in achieving excellent hydrogen resistance while maintaining excellent overall mechanical properties. Summary of the Invention

[0007] The purpose of the present invention is to overcome the problem in the prior art that spiral submerged arc welded pipes for hydrogen pipelines cannot have both good mechanical properties and excellent hydrogen resistance, and to provide a spiral submerged arc welded pipe for hydrogen pipelines and a preparation method thereof.

[0008] In order to achieve the above object, a first aspect of the present invention provides a method for manufacturing a spiral submerged arc welded pipe for a hydrogen transmission pipeline, wherein the method comprises the following steps:

[0009] (1) Flattening the X52MS hot-rolled sheet to obtain a steel strip; wherein, in the X52MS hot-rolled sheet, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, CE≤0.01 ... Pcm ≤0.16;

[0010] (2) milling the edge of the steel strip so that a welding groove can be formed after the milled steel strip is rolled;

[0011] (3) rolling the milled steel strip to obtain a spiral cylinder;

[0012] (4) A special hydrogen-resistant welding wire is used to weld the spiral cylinder using a double-wire tandem submerged arc automatic welding process to obtain a spiral submerged arc welded pipe for a hydrogen pipeline; wherein the chemical composition of the weld metal of the weld pipe is controlled by mass percentage as follows: C≤0.05%, Mn≤1.4%, Ni: 0.3%-0.4%, Mo: 0.15%-0.25%, P≤0.01%, S≤0.0015%.

[0013] The second aspect of the present invention provides a spiral submerged arc welded pipe for a hydrogen transmission pipeline manufactured by the manufacturing method described in the first aspect of the present invention.

[0014] A third aspect of the present invention provides a spiral submerged arc welded pipe for a hydrogen transmission pipeline, wherein the base material of the welded pipe is an X52MS hot-rolled plate;

[0015] Wherein, in the X52MS hot-rolled plate, by mass percentage, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, CE Pcm ≤0.16;

[0016] The chemical composition of the weld deposited metal of the weld pipe is controlled by mass percentage as follows: C≤0.05%, Mn≤1.4%, Ni: 0.3%-0.4%, Mo: 0.15%-0.25%, P≤0.01%, S≤0.0015%.

[0017] Through the above technical solution, the beneficial technical effects achieved by the present invention are as follows:

[0018] 1) The manufacturing method of the spiral submerged arc welded pipe provided in the present invention uses X52MS hot-rolled coil with hydrogen resistance. By controlling the key forming and welding processes of the pipe manufacturing process, the X52MS spiral submerged arc welded pipe with good weldability, good comprehensive mechanical properties, and strong hydrogen resistance can be manufactured;

[0019] 2) The manufacturing method of spiral submerged arc welded pipe provided by the present invention controls the key forming process of pipe making, so that the geometric dimensions of the spiral cylinder after pipe making, such as diameter, straightness, and ovality, are highly accurate. Forming defects such as misalignment, pouting, and roller marks are eliminated, and the overall residual stress of the steel pipe is reduced, thus avoiding stress corrosion cracking of the material in a hydrogen environment and improving the hydrogen resistance of the steel pipe.

[0020] 3) The manufacturing method of the spiral submerged arc welded pipe provided in the present invention performs submerged arc automatic welding on the inner and outer grooves of the spiral cylinder, quantifies the welding heat input, and uses a special hydrogen transmission welding wire to reasonably control the chemical elements and content of the deposited metal in the weld. This can not only ensure that the spiral submerged arc welded pipe has excellent comprehensive mechanical properties, but also reduce the tendency of the spiral submerged arc welded pipe to produce hydrogen embrittlement in a hydrogen environment, thus solving many problems of hydrogen embrittlement and hydrogen-induced cracking of pipes, improving product quality and production efficiency, and the manufactured welded pipe has both good mechanical properties and excellent hydrogen resistance, which can meet the technical requirements of pipes for hydrogen pipeline construction and realize the application of spiral submerged arc welded pipes in the field of hydrogen pipelines;

[0021] 4) The manufacturing method of the spiral submerged arc welded pipe provided in the present invention has a simple manufacturing process and is easy to realize industrial production. It is a new type of efficient and economical production method for hydrogen transmission pipes. DETAILED DESCRIPTION

[0022] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0023] A first aspect of the present invention provides a method for manufacturing a spiral submerged arc welded pipe for a hydrogen transmission pipeline, wherein the method comprises the following steps:

[0024] (1) Flattening the X52MS hot-rolled sheet to obtain a steel strip; wherein, in the X52MS hot-rolled sheet, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, CE≤0.01 ... Pcm ≤0.16;

[0025] (2) milling the edge of the steel strip so that a welding groove can be formed after the milled steel strip is rolled;

[0026] (3) rolling the milled steel strip to obtain a spiral cylinder;

[0027] (4) A special hydrogen-resistant welding wire is used to weld the spiral cylinder using a double-wire tandem submerged arc automatic welding process to obtain a spiral submerged arc welded pipe for a hydrogen transmission pipeline; wherein the chemical composition of the weld deposit (i.e., molten metal) is controlled by mass percentage as follows: C≤0.05%, Mn≤1.4%, Ni: 0.3%-0.4%, Mo: 0.15%-0.25%, P≤0.01%, S≤0.0015%.

[0028] Among them, in the present invention, the C content in the X52MS hot-rolled plate is controlled at a low level, which can improve the weldability of the hot-rolled plate; reduce the content of Mn, P, S and CE Pcm The low content of (weld crack sensitivity index) can reduce the impact of the above elements on the hydrogen resistance of the hot-rolled plate, reduce the hydrogen embrittlement sensitivity of the hot-rolled plate, and ensure that the hydrogen pipeline prepared using the hot-rolled plate of the present invention will not suffer from hydrogen damage such as hydrogen embrittlement and hydrogen-induced cracking. When the chemical composition and content of the weld deposited metal are controlled within the above-defined range, 0.30-0.4wt% Ni and 0.15-0.25wt% Mo are conducive to the formation of acicular ferrite in the weld, which can improve the fracture toughness of the spiral submerged arc welded pipe for hydrogen pipelines. While reducing the content of harmful elements S and P in the weld, by controlling the Mn content, on the one hand, it can compensate for the impact of ultra-low C on the strength of the hot-rolled plate, and on the other hand, it can avoid the formation of strip-shaped non-metallic inclusions such as MnS, which helps to significantly reduce the hydrogen embrittlement sensitivity of the weld. Therefore, the spiral submerged arc welded pipe for hydrogen pipelines of the present invention can have both good comprehensive mechanical properties and excellent hydrogen resistance.

[0029] In a preferred embodiment of the present invention, the X52MS hot-rolled plate further comprises, measured by mass percentage, the following components: Cr≤0.2%, Mo≤0.2%, Ni≤0.2%, Cu≤0.2%, Nb≤0.06%, Ti≤0.04%, and V≤0.05%.

[0030] Among them, in the present invention, by strictly controlling key elements in the steel smelting process, coordinating with the TMCP controlled cooling process, and adjusting parameters such as the reduction, rolling temperature, and cooling rate, it is possible to obtain X52MS hot-rolled coils with both strength and toughness, good weldability, excellent hydrogen resistance, and a component content within the specified range of the present invention, laying the foundation for the manufacture of X52MS spiral submerged arc welded pipes.

[0031] In one embodiment of the present invention, the flattening is performed in a leveler. In the present invention, flattening can be performed using conventional procedures in the art and is not particularly limited thereto. Flattening allows the X52MS hot-rolled sheet coil to be unrolled into steel strip, removing stress from the coil and improving subsequent welding.

[0032] In one embodiment of the present invention, the edge milling is performed in an edge milling machine. Specifically, in the present invention, an I-shaped groove is first roughly milled on the flattened steel strip, reducing the edge width by 10-20 mm to ensure the width of the steel strip. Then, an X-shaped groove is finely milled on the upper and lower surfaces of the steel strip, thereby improving welding efficiency and reducing welding material consumption.

[0033] In one embodiment of the present invention, the rolling is carried out in a three-roll former, and the grooved steel strip is rolled into a diameter of spiral cylinder.

[0034] In one embodiment of the present invention, the operating conditions of the three-roll former include: the angle of the 2# roll is 41°46"-57°54", the angles of the 1# and 3# rolls are both 43°34"-58°38", the wrap angle of the 1# roll is 16°50"-21°60", and the wrap angle of the 3# roll is 23°52"-29°60". During the rolling process, the angle, reduction, and spacing of each roll group are kept consistent, so that the steel plate is uniformly stressed and deformed, thereby achieving low-stress forming of the steel pipe.

[0035] In one embodiment of the present invention, the residual stress of the spiral cylinder measured by the ring cutting method is ≤20 mm.

[0036] Among them, in the present invention, the geometric dimensions of the spiral cylinder, such as the tube diameter, straightness, and ovality, have high precision. The rolling process can eliminate forming defects such as misalignment, pouting, and roller marks, reduce the overall residual stress of the steel pipe, avoid stress corrosion cracking of the material in a hydrogen environment, and improve the hydrogen resistance of the steel pipe.

[0037] In one embodiment of the present invention, the hydrogen-resistant welding wire is not particularly limited, and any conventional commercially available hydrogen-resistant welding wire can be used in the present invention. Preferably, the chemical composition of the hydrogen-resistant welding wire is as follows, measured by mass percentage: C ≤ 0.05%, Si ≤ 0.25%, Mn ≤ 1.5%, Ni: 1%-1.2%, Mo: 0.25%-0.4%, P ≤ 0.01%, and S ≤ 0.005%.

[0038] In one embodiment of the present invention, both the inner and outer welding of the spiral cylinder adopt a double-wire serial submerged arc automatic welding process.

[0039] In one embodiment of the present invention, the operating conditions of the double-wire tandem submerged arc automatic welding process include: the inner welding wire is DC reverse connection, the current is 725-875A, and the voltage is 31-33V; the outer welding wire is DC reverse connection, the current is 875-1025A, and the voltage is 32-34V; the inner welding wires are AC, the current is 380-460V, and the voltage is 36-38V; the outer welding wires are AC, the current is 380-460V, and the voltage is 36-38V; the welding speed is 1.95-2m / min.

[0040] Among them, in the present invention, a double-wire serial submerged arc automatic welding process is adopted for welding. By quantifying the welding heat input, the excessive burning of alloy elements can be controlled, and the toughness reduction and softening of the heat-affected zone of the weld caused by coarse grains can be effectively prevented. In addition, the welding of internal and external welds can be completed quickly in one go, thereby improving the manufacturing speed.

[0041] In one embodiment of the present invention, the spiral submerged arc welded pipe for the hydrogen transmission pipeline can be optionally cut. In the present invention, the spiral submerged arc welded pipe for the hydrogen transmission pipeline can be cut to obtain steel pipes of varying lengths based on actual needs. To facilitate sampling and analysis, the cut steel pipes can be numbered.

[0042] The second aspect of the present invention provides a spiral submerged arc welded pipe for a hydrogen transmission pipeline manufactured by the manufacturing method described in the first aspect of the present invention.

[0043] In one embodiment of the present invention, the yield strength of the spiral submerged arc welded pipe for the hydrogen transmission pipeline is ≥360 MPa, preferably 400-450 MPa.

[0044] In one embodiment of the present invention, the tensile strength of the spiral submerged arc welded pipe for the hydrogen transmission pipeline is ≥460 MPa, preferably 540-580 MPa.

[0045] In one embodiment of the present invention, the elongation of the spiral submerged arc welded pipe for the hydrogen transmission pipeline is ≥35%, preferably 45-50%.

[0046] Among them, the yield strength, tensile strength and elongation of spiral submerged arc welded pipes for hydrogen pipelines refer to the test results of the pipe body of spiral submerged arc welded pipes for hydrogen pipelines.

[0047] The third aspect of the present invention provides a spiral submerged arc welded pipe for hydrogen pipeline, wherein the base material of the welded pipe is X52MS hot rolled plate; wherein, in the X52MS hot rolled plate, by mass percentage, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, CE Pcm ≤0.16;

[0048] The chemical composition of the weld deposited metal of the weld pipe is controlled by mass percentage as follows: C≤0.05%, Mn≤1.4%, Ni: 0.3%-0.4%, Mo: 0.15%-0.25%, P≤0.01%, S≤0.0015%.

[0049] In one embodiment of the present invention, the X52MS hot-rolled plate further comprises, by mass percentage, Cr≤0.2%, Mo≤0.2%, Ni≤0.2%, Cu≤0.2%, Nb≤0.06%, Ti≤0.04%, and V≤0.05%.

[0050] The present invention will be described in detail below through examples.

[0051] Example 1

[0052] X52MS hot-rolled coil is used to manufacture spiral submerged arc welded pipes with a diameter of 457 mm and a wall thickness of 8.8 mm for hydrogen transmission pipelines. The specific process steps are as follows:

[0053] 1. Use a leveler to flatten the curled X52MS hot-rolled coil to obtain a steel strip;

[0054] 2. Mill the edges of the steel strips. First, roughly mill the I-shaped groove and reduce the width of the edge by 10-20mm to ensure the width of the steel strips. Then, fine mill the upper and lower surfaces into X-shaped grooves to improve welding efficiency and reduce welding material consumption.

[0055] 3. Place the milled steel strip in a three-roll former and roll it into a diameter of 45°2” at a forming angle. For the spiral cylinder, the position and angle of each forming roller are precisely measured and controlled. The angle of roller 2 is 44°28", the angles of rollers 1# and 3# are 45°36", the wrap angle of roller 1# is 20°30", and the wrap angle of roller 3# is 29°10". This ensures that the angles, reductions, and spacing of each roller group are consistent, ensuring uniform stress and deformation of the steel plate. Geometric dimensions such as tube diameter and ovality are strictly controlled, and process defects such as misalignment and pouting are avoided. After rolling, the residual stress of the spiral cylinder measured by the ring cutting method is ≤20mm.

[0056] 4. Welding: Using a 3.2mm diameter hydrogen-resistant special hydrogen-resistant welding wire (model: H08GSK, manufacturer: Dongguang Shunqi Welding Materials Co., Ltd.), a double-wire tandem submerged arc automatic welding process is used to perform internal and external welding on the inner and outer welding grooves of the spiral cylinder to obtain a welded pipe. The welding process parameters are shown in Table 1:

[0057] Table 1

[0058] 5. Pipe cutting: Cut the welded pipe to a fixed length according to standard requirements to obtain spiral submerged arc welded pipes for hydrogen pipelines; uniquely number each section of spiral submerged arc welded pipes for hydrogen pipelines obtained by cutting, and take samples for physical and chemical properties and conduct tests.

[0059] Test Example 1

[0060] Weld X-ray Inspection: 100% X-ray industrial television inspection was conducted on the entire weld seam of the spiral submerged arc welded pipe used in the hydrogen transmission pipeline, and X-ray film inspection was performed on the pipe ends to eliminate possible defects in the weld seams. The inspection results showed that there were no welding defects in the weld seams.

[0061] Hydrostatic pressure test: The spiral submerged arc welded pipe for hydrogen transmission pipeline is sealed at both ends, filled with water, and pressurized. After reaching the pressure value required by the standard, the pressure is maintained for a period of time. The spiral submerged arc welded pipe is inspected for leakage, deformation, etc. The test results show that the hydrostatic pressure test results of the spiral submerged arc welded pipe for hydrogen transmission pipeline are qualified.

[0062] Mechanical flat head: According to the requirements of girth weld welding at the construction site, the spiral submerged arc welded pipe ends of the hydrogen pipeline are mechanically processed to the groove and blunt edge dimensions.

[0063] Finished Product Appearance Inspection: Measure geometric dimensions of spiral submerged arc welded pipes for hydrogen transmission pipelines, including circumference, ovality, weld reinforcement, groove angle, blunt edge dimensions, and wall thickness. Also, inspect, repair, and measure defects such as undercuts, pits, and scratches that cause stress concentration and affect minimum wall thickness. If the inspection results indicate that the product has passed the appearance inspection, it can be sprayed and delivered to the warehouse.

[0064] Test Example 2

[0065] The components and contents of the deposited metal in the pipe body and weld of spiral submerged arc welded pipes for hydrogen transmission pipelines were tested using a direct reading spectrometer. The test results are shown in Table 2:

[0066] Table 2

[0067] Test Example 3

[0068] The tensile and guided bend properties of the pipe body and weld of spiral submerged arc welded pipes for hydrogen transmission pipelines were tested, and the test results are shown in Table 3. The yield strength, tensile strength, elongation, and guided bend test standards are: ASTM A370-22.

[0069] Table 3

[0070] Test Example 4

[0071] The fracture toughness of the pipe body, weld, and heat-affected zone of spiral submerged arc welded pipes for hydrogen transmission pipelines were tested, and the test results are shown in Table 4. The fracture toughness was measured using the method specified in ISO 12135-2021.

[0072] Table 4

[0073] Test Example 5

[0074] The Vickers hardness of the welded joints of spiral submerged arc welded pipes for hydrogen transmission pipelines was tested, and the test results are shown in Table 5. The Vickers hardness was measured using the method specified in ASTM E92-17.

[0075] Table 5

[0076] Test Example 6

[0077] The spiral submerged arc welded pipe used for hydrogen transmission pipeline was subjected to HIC test for hydrogen-induced cracking, and the test results are shown in Table 6. The HIC test was carried out using the method specified in NACE TM0284-2016.

[0078] Table 6

[0079] The above test results show that the spiral submerged arc welded pipe for hydrogen pipelines prepared in the present invention has excellent comprehensive mechanical properties, especially excellent fracture toughness. The CTOD of the pipe body base material at -10°C is ≥1.151mm; the CTOD of the weld at -10°C is ≥0.559mm; and the CTOD of the heat-affected zone at -10°C is ≥1.055mm. At the same time, the spiral submerged arc welded pipe for hydrogen pipelines has excellent resistance to hydrogen-induced cracking. After immersion in standard A solution (0.5wt% CH3COOH + 5wt% NaCl) for 96 hours in the HIC test, metallographic analysis at 100x magnification showed that the crack length ratio (CLR), crack thickness ratio (CTR), and crack sensitivity ratio (CSR) of the sample were all 0, meeting the performance requirements of spiral submerged arc welded pipe for hydrogen pipelines.

[0080] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for manufacturing a spiral submerged arc welded pipe for a hydrogen transmission pipeline, characterized in that: The method comprises the following steps: (1) Flattening an X52MS hot-rolled sheet coil to obtain a steel strip; wherein, in the X52MS hot-rolled sheet, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, CE Pcm ≤0.16; (2) milling the edge of the steel strip so that a welding groove can be formed after the milled steel strip is rolled; (3) rolling the milled steel strip to obtain a spiral cylinder; (4) A special hydrogen-resistant welding wire is used to weld the spiral cylinder using a double-wire tandem submerged arc automatic welding process to obtain a spiral submerged arc welded pipe for a hydrogen pipeline; wherein the chemical composition of the weld deposited metal is controlled by mass percentage as follows: C≤0.05%, Mn≤1.4%, Ni: 0.3%-0.4%, Mo: 0.15%-0.25%, P≤0.01%, S≤0.0015%.

2. The manufacturing method according to claim 1, wherein: The X52MS hot-rolled plate, measured by mass percentage, also includes: Cr≤0.2%, Mo≤0.2%, Ni≤0.2%, Cu≤0.2%, Nb≤0.06%, Ti≤0.04%, and V≤0.05%.

3. The manufacturing method according to claim 1 or 2, wherein: The rolling is carried out in a three-roller former, and the milled steel strip is rolled into a diameter of 42°40"-58°16" according to the forming angle. Spiral cylinder.

4. The manufacturing method according to claim 3, wherein: The operating conditions of the three-roll former include: the angle of the 2# roll is 41°46"-57°54", the angles of the 1# roll and the 3# roll are both 43°34"-58°38", the wrap angle of the 1# roll is 16°50"-21°60", and the wrap angle of the 3# roll is 23°52"-29°60".

5. The manufacturing method according to claim 1, wherein: The residual stress of the spiral cylinder measured by the ring cutting method is ≤20mm.

6. The manufacturing method according to claim 1, wherein: The chemical composition of the special hydrogen-resistant welding wire is measured by mass percentage as follows: C≤0.05%, Si≤0.25%, Mn≤1.5%, Ni: 1%-1.2%, Mo: 0.25%-0.4%, P≤0.01%, S≤0.005%.

7. The manufacturing method according to claim 1, wherein: The operating conditions of the double-wire tandem submerged arc automatic welding process include: the inner welding wire is DC reverse connection, the current is 725-875A, and the voltage is 31-33V; the outer welding wire is DC reverse connection, the current is 875-1025A, and the voltage is 32-34V; the inner welding wires are AC, the current is 380-460V, and the voltage is 36-38V; the outer welding wires are AC, the current is 380-460V, and the voltage is 36-38V; the welding speed is 1.95-2m / min.

8. A spiral submerged arc welded pipe for a hydrogen transport pipeline manufactured by the manufacturing method according to any one of claims 1 to 7.

9. The spiral submerged arc welded pipe for hydrogen transport pipeline according to claim 8, wherein: The yield strength of the spiral submerged arc welded pipe for hydrogen pipeline is ≥360MPa, preferably 400-450MPa; And / or, the tensile strength of the spiral submerged arc welded pipe for the hydrogen pipeline is ≥460MPa, preferably 540-580MPa; And / or, the elongation of the spiral submerged arc welded pipe for hydrogen transmission pipeline is ≥35%, preferably 45-50%.

10. A spiral submerged arc welded pipe for hydrogen transmission pipeline, characterized in that: The base material of the welded pipe is X52MS hot-rolled plate; Among them, in the X52MS hot-rolled plate, measured by mass percentage, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, CE Pcm ≤0.16; The chemical composition of the weld deposited metal of the weld pipe is controlled by mass percentage as follows: C≤0.05%, Mn≤1.4%, Ni: 0.3%-0.4%, Mo: 0.15%-0.25%, P≤0.01%, S≤0.0015%.

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