A boron-containing seamless line pipe for offshore oil and gas development

A seamless line pipe, oil and gas technology, applied in the field of seamless line pipe, can solve the problems of line pipe failure and scrap, and achieve the effects of reducing the γ-α phase transition temperature, reducing the ductile-brittle transition temperature, and expanding the γ phase region.

Active Publication Date: 2016-06-29
JIANGSU CHANGBAO STEELTUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used X52 steel grade seamless line pipes are prone to internal and external corrosion, low-temperature impact and external force in this environment, resulting in stress concentration at the material defects and weld defects of the line pipes, resulting in failure and scrapping

Method used

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  • A boron-containing seamless line pipe for offshore oil and gas development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A boron-containing seamless line pipe for offshore oil and gas development, its chemical elements and their mass percentages are as follows:

[0022] C: 0.09%;

[0023] Si: 0.23%;

[0024] Mn: 1.6%;

[0025] Mo: 0.15%;

[0026] Ni: 0.15%;

[0027] B: 0.0015%;

[0028] Cr: 0.2%;

[0029] Nb: 0.06%;

[0030] P:0.012%;

[0031] S:0.003%;

[0032] Cu:0.25%;

[0033] V: 0.015%;

[0034] Al: 0.04%;

[0035] The rest is Fe and other unavoidable impurities.

[0036] A method for manufacturing a boron-containing seamless line pipe for offshore oil and gas development, the steps of the method are as follows:

[0037] a) Steel scrap, pig iron and ingredients are smelted and cast to obtain the tube blank, and in the process, ensure that the chemical elements of the boron-containing seamless line pipe for offshore oil and gas development meet the above mass percentage requirements: scrap steel, pig iron and The ingredients are first smelted in an electric furnace, followe...

Embodiment 2

[0043] A boron-containing seamless line pipe for offshore oil and gas development, its chemical elements and their mass percentages are as follows:

[0044] C: 0.13%;

[0045] Si: 0.35%;

[0046] Mn: 1.2%;

[0047] Mo: 0.25%;

[0048] Ni: 0.2%;

[0049] B: 0.0025%;

[0050] Cr: 0.23%;

[0051] Nb: 0.04%;

[0052] P:0.01%;

[0053] S:0.005%;

[0054] Cu:0.35%;

[0055] Al: 0.03%

[0056] The rest is Fe and other unavoidable impurities.

[0057] A method for manufacturing a boron-containing seamless line pipe for offshore oil and gas development, the steps of the method are as follows:

[0058] a) Steel scrap, pig iron and ingredients are smelted and cast to obtain the tube blank, and in this process, ensure that the chemical elements of the boron-containing seamless line pipe for offshore oil and gas development meet the above-mentioned mass percentage requirements: scrap steel, pig iron The ingredients and ingredients are first smelted in the electric furnace, foll...

Embodiment 3

[0064] A boron-containing seamless line pipe for offshore oil and gas development, its chemical elements and their mass percentages are as follows:

[0065] C: 0.15%;

[0066] Si: 0.3%;

[0067] Mn: 1%;

[0068] Mo: 0.4%;

[0069] Ni: 0.2%;

[0070] B: 0.002%;

[0071] Cr: 0.15%;

[0072] Nb: 0.02%;

[0073] P:0.01%;

[0074] S:0.006%;

[0075] Cu:0.4%;

[0076] Al: 0.04%;

[0077] The rest is Fe and other unavoidable impurities.

[0078] A method for manufacturing a boron-containing seamless line pipe for offshore oil and gas development, the steps of the method are as follows:

[0079] a) Steel scrap, pig iron and ingredients are smelted and cast to obtain the tube blank, and in this process, ensure that the chemical elements of the boron-containing seamless line pipe for offshore oil and gas development meet the above-mentioned mass percentage requirements: scrap steel, pig iron The ingredients and ingredients are first smelted in the electric furnace, followed ...

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Abstract

The invention discloses a boron-containing seamless pipe line pipe for ocean oil and gas exploitation. The boron-containing seamless pipe line pipe is characterized by comprising the following chemical elements by weight percent: 0.09 to 0.19 percent of C, 0.23 to 0.38 percent of Si, 0.9 to 1.7 percent of Mn, 0.0015 to 0.0025 percent of B, 0.01 to 0.07 percent of Nb, less than or equal to 0.012 percent of P, less than or equal to 0.007 percent of S and the balance of Fe and unavoidable impurities. The boron-containing seamless pipe line pipe is high in tensile strength, good in welding property, excellent in salt water and acid environmental corrosion resistance and good in low-temperature impact resistance, the low-temperature impact resistance can reach 100J under the condition of minus 70 DEG C, and the boron-containing seamless pipe line pipe has the characteristic of high flexibility; by adopting the way for combining hot rolling and tempering heat treatment, the strength can reach the grade of more than 80ksi.

Description

technical field [0001] The invention relates to a boron-containing seamless line pipe for offshore oil and gas development, belonging to the technical field of seamless line pipes. Background technique [0002] At present, with the recovery of the world economy and the continuous expansion of the economic development scale of developing countries, especially the rapid development of China's economy, the world's energy and transportation have entered an extremely tense situation. Conduct new feasibility study report and new pipeline laying plan. It is estimated that in the next 10 to 15 years, the total global energy consumption will increase by about 60% compared with the present, and the consumption of natural gas will double. [0003] CO emissions from natural gas 2 Less, so the current trend of energy use is a steady transition from oil to natural gas. Different from oil transportation, high-pressure operation is used in the gas transportation process, which can improve...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C38/12C22C38/58C22C38/54C22C38/38C22C38/32C22C38/16C22C38/14
Inventor许才斌郑臻高建昌於宝祥汪勇李珺张劲松王燕萍
OwnerJIANGSU CHANGBAO STEELTUBE CO LTD