Preparation method of boron-containing seamless line pipe for offshore oil and gas development

A technology of seamless line pipe and manufacturing method, which is applied in the field of seamless line pipe, can solve problems such as line pipe failure and scrapping, and achieve the effects of reducing the γ-α phase transition temperature, expanding the γ phase region, and improving toughness

Active Publication Date: 2016-05-25
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A boron-containing seamless line pipe for offshore oil and gas development, its chemical elements and their mass percentages are as follows:

[0018] C: 0.09%;

[0019] Si: 0.23%;

[0020] Mn: 1.6%;

[0021] Mo: 0.15%;

[0022] Ni: 0.15%;

[0023] B: 0.0015%;

[0024] Cr: 0.2%;

[0025]Nb: 0.06%;

[0026] P:0.012%;

[0027] S:0.003%;

[0028] Cu:0.25%;

[0029] V: 0.015%;

[0030] Al: 0.04%;

[0031] The rest is Fe and other unavoidable impurities.

[0032] A method for manufacturing a boron-containing seamless line pipe for offshore oil and gas development, the steps of the method are as follows:

[0033] 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, follow...

Embodiment 2

[0039] A boron-containing seamless line pipe for offshore oil and gas development, its chemical elements and their mass percentages are as follows:

[0040] C: 0.13%;

[0041] Si: 0.35%;

[0042] Mn: 1.2%;

[0043] Mo: 0.25%;

[0044] Ni: 0.2%;

[0045] B: 0.0025%;

[0046] Cr: 0.23%;

[0047] Nb: 0.04%;

[0048] P:0.01%;

[0049] S:0.005%;

[0050] Cu:0.35%;

[0051] Al: 0.03%

[0052] The rest is Fe and other unavoidable impurities.

[0053] A method for manufacturing a boron-containing seamless line pipe for offshore oil and gas development, the steps of the method are as follows:

[0054] 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

[0060] A boron-containing seamless line pipe for offshore oil and gas development, its chemical elements and their mass percentages are as follows:

[0061] C: 0.15%;

[0062] Si: 0.3%;

[0063] Mn: 1%;

[0064] Mo: 0.4%;

[0065] Ni: 0.2%;

[0066] B: 0.002%;

[0067] Cr: 0.15%;

[0068] Nb: 0.02%;

[0069] P:0.01%;

[0070] S:0.006%;

[0071] Cu:0.4%;

[0072] Al: 0.04%;

[0073] The rest is Fe and other unavoidable impurities.

[0074] A method for manufacturing a boron-containing seamless line pipe for offshore oil and gas development, the steps of the method are as follows:

[0075] 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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PUM

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Abstract

The invention discloses a preparation method of a boron-containing seamless pipeline for marine petroleum and natural gas exploitation, which comprises the following steps: a) adopting, smelting and casting waste steel, pig iron and ingredients to obtain a pipe blank, wherein the pipe blank surely comprises the following chemical elements by weight percentage: 0.09-0.19 percent of C, 0.23-0.38 percent of Si, 0.9-1.7 percent of Mn, 0.0015-0.0025 percent of B, 0.01-0.07 percent of Nb, not greater than 0.012 percent of P, not greater than 0.007 percent of S, and Fe and other unavoidable impurities in balancing amount; b) performing heat treatment of the pipe blank; c) then rolling; d) finally obtaining the boron-containing seamless pipeline for the marine petroleum and natural gas exploitation via the heat treatment and detection. The pipeline prepared by the preparation method is high in tensile strength, good in welding performance, excellent in resistance to corrosion of brine and an acid environment and good in low-temperature impact resistance, and has the characteristic of high toughness, and the low-temperature impact resistance can reach 100 J at 70 DEG C below zero.

Description

technical field [0001] The invention relates to a method for preparing a boron-containing seamless line pipe for offshore oil and gas development, and belongs 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 p...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C38/12C22C38/16C22C38/14C22C38/38C22C38/32C22C38/58C22C38/54C21D8/10
Inventor许才斌郑臻王国富张劲松汪勇李珺王燕萍
OwnerJIANGSU CHANGBAO STEELTUBE CO LTD