A kind of ultra-high-strength ultra-high-toughness oil casing and its TMCP manufacturing method
An ultra-high toughness, ultra-high strength technology, applied in the field of ultra-high-strength ultra-high-toughness oil casing and its TMCP manufacturing, can solve problems such as reducing toughness, and achieve the effects of improving strength and toughness, good toughness, and good economic benefits
Active Publication Date: 2017-07-28
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology
The design feature of the patented chemical composition is high carbon and high silicon. These two components can significantly increase the strength, but also significantly reduce the toughness. At the same time, the residual austenite will undergo structural transformation during the use of oil pipes.
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[0049] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0050] Table 1 shows the chemical composition of the bushings of the examples of the present invention and comparative examples, Table 2 shows the manufacturing process of the bushings of the examples of the present invention and comparative examples, and Table 3 shows the properties of the bushings of the examples of the present invention and comparative examples.
[0051] It can be seen from Table 3 that the yield strength of the bushings in Examples 1-5 of the present invention are all ≥ 965MPa (the strength requirement above 140ksi steel grade has been reached), the tensile strength is all ≥ 1060MPa, and the transverse impact energy at 0°C is all ≥ 128J, The elongations are all ≥ 23%, and the ductile-brittle transition temperatures are all ≤ -70°C. It can be seen that the casings of the present invention have ultra-high strength and ultra-high toughn...
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Abstract
Provided are a super-strength and super-toughness petroleum casing pipe and a TMCP manufacturing method thereof. The petroleum casing pipe is prepared from, by mass, 0.1%-0.22% of C, 0.1%-0.4% of Si, 0.3%-1% of Mn, 0.2%-0.6% of Mo, 0.02%-0.04% of Nb, 0.05%-0.15% of V, 0.02%-0.05% of Ti, 0.0015%-0.005% of B, 0.01%-0.05% of Al, 0.008% of N or less, 0.015% of P or less, 0.003% of S or less and the balance Fe and inevitable impurities. The formulae that 0<(Ti-3.4N)<=0.02%, and 10<=Ti / B<=20 are met at the same time. A process of controlled cooling after rolling is adopted, grains are refined, and toughness is remarkably improved; and the petroleum casing pipe has super strength and super toughness at the same time, and the requirement of deep well and extradeep well oil and gas fields for the strength and toughness of an oil well pipe is met.
Description
technical field [0001] The invention relates to the technical field of oil casing, in particular to an ultra-high-strength, ultra-high-toughness oil casing and a TMCP manufacturing method thereof. Background technique [0002] At present, the exploitation of oil and gas resources in deep wells and ultra-deep wells has significantly increased the requirements for casing strength, but the hardness of materials will increase accordingly, the toughness of materials will gradually decrease, and the sensitivity of materials to surface defects will further increase . Casing used in mining deep wells and ultra-deep wells has high requirements on strength and toughness. While meeting high strength, it is necessary to improve its toughness index as much as possible to ensure the safety of production and use. [0003] However, high-strength steel usually has low plasticity and toughness. To make steel have high plasticity and toughness, the strength of steel must be reduced. For this...
Claims
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IPC IPC(8): C22C38/12C22C38/14C22C38/02C22C38/04C22C38/06C21D8/10
CPCC21D8/105C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 董晓明张忠铧李群蔡海燕
Owner BAOSHAN IRON & STEEL CO LTD