Crack initiation steel pipe for full-scale gas bursting test of large-diameter high-grade steel gas pipeline and preparation method thereof
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A gas pipeline and blasting test technology, which is applied in the field of cracking steel pipes for full-scale gas blasting tests of large-diameter high-steel gas pipelines and its preparation, and can solve the problems of undetermined mature technology
Inactive Publication Date: 2011-11-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0004] At present, the preparation of crack-initiating pipe sections with appropriate toughness is also an exploratory technology in the world, and there is no mature technology that can be directly applied
Method used
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Embodiment 1
[0019] Example 1 of the present invention provides a crack-initiating steel pipe for a full-scale gas explosion test of a large-diameter high-grade gas pipeline. The composition of the steel pipe includes, by mass percentage, C: 0.08%, Mn: 1.70%, Si: 0.28%, P: 0.011%, S: 0.011%, Al: 0.010%, Nb: 0.04%, Ti: 0.02%, Mo: 0.17%, Ni: 0.18%, Cu: 0.13%, O: 0.0019%, H: 0.00015%, N: 0.005%, carbon equivalent = 0.42%, cold crack sensitivity coefficient = 0.20%, and the balance is Fe and unavoidable impurities.
preparation Embodiment 1
[0020] The embodiment of the present invention also provides a method for preparing a crack-initiating steel pipe for a full-scale gas explosion test of a large-diameter high-grade gas pipeline described in Embodiment 1, comprising the following steps:
[0021] (1) Weighing various alloying elements according to the mass percentage of the composition, smelting in an oxygen-blown converter and refining outside the furnace, controlling the impurity content of P, S, O, H, and N in the steel, and continuously casting it into a thick slab;
[0022] (2) Heat the thick slab in (1) to 1190°C-1210°C, soak for 0.5h, then rough roll at 1050°C-1100°C, finish roll at 850°C-950°C, and cool at a rate of 20°C after rolling. ℃ / s~30℃ / s, made into a hot-rolled steel plate with a thickness of about 18.4mm;
[0023] (3) The hot-rolled steel plate in (2) is formed by J-C-O, multi-pass longitudinal submerged arc welding, and then expanded by 0.6% to 0.8% to make a longitudinal submerged arc welded s...
Embodiment 2
[0026] Example 2 of the present invention provides a crack-initiating steel pipe for a full-scale gas explosion test of a large-diameter high-grade gas pipeline. The composition of the steel pipe includes, by mass percentage, C: 0.07%, Mn: 1.74%, Si: 0.22%, P: 0.012%, S: 0.013%, Al: 0.015%, V: 0.04%, Ti: 0.03%, Mo: 0.20%, Ni: 0.15%, Cu: 0.16%, O: 0.0017%, H: 0.00014%, N: 0.0035%, carbon equivalent = 0.42%, cold crack sensitivity coefficient = 0.17%, and the balance is Fe and unavoidable impurities.
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Abstract
The invention discloses a crack initiation steel pipe for a full-scale gas bursting test of a large-diameter high-grade steel gas pipeline and a preparation method thereof, belonging to the field of a petroleum pipeline breakage control test. The steel pipe comprises the following components by weight percent: 0.07%-0.12% of C, 1.50%-1.75% of Mn, 0.15%-0.35% of Si, less than or equal to 0.015% of P, 0.010%-0.020% of S, 0.005%-0.030% of Al, less than or equal to 0.002% of O, less than or equal to 0.00015% of H, less than or equal to 0.005% of N and the balance of Fe; and carbon equivalent is less than or equal to 0.55%, and the cold cracking sensitive coefficient is less than or equal to 0.28%. The preparation method comprises the following steps: smelting and continuously casting the raw materials so as to form a thick slab; carrying out rough rolling and precise rolling so as to obtain a hot rolled steel plate; and forming the hot rolled steel plate, then welding, and then expanding diameter so as to prepare the steel pipe, wherein the yield strength of the steel pipe is 550MPa-840MPa, the tensile strength of the steel pipe is 625MPa-990MPa, the charpy impact toughness of the steel pipe at the temperature of 0 DEG C is controlled between 100J-200J, and the fracture shearing area in a drop test is larger than or equal to 85%. The prepared steel pipe is used as the crack initiation steel pipe for the full-scale gas bursting test; and after crack initiation is carried out, the fracture is of ductile fracture topography and has no obvious fracture separation.
Description
technical field [0001] The invention relates to a steel pipe formula and a preparation method thereof, in particular to a large-diameter high-grade steel-grade gas pipeline full-scale gas cracking test steel pipe and a preparation method thereof, in particular to a steel grade with a strength level reaching X80, X90, and X100 , steel pipe outer diameter 760mm ~ 1422mm, wall thickness 12mm ~ 30mm, delivery pressure of 10MPa and above large-diameter high-grade steel gas pipeline full-scale gas cracking open steel pipe and its preparation method. Background technique [0002] With the rapid development of the large-diameter high-pressure gas pipeline industry, pipeline safety issues have attracted much attention. The long-distance expansion of ductile cracks in large-diameter high-pressure gas pipelines is the biggest threat to pipeline safety. If the pipeline is improperly designed or used, the long-distance expansion of cracks is likely to occur. In severe cases, the cracks c...
Claims
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Application Information
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