555 MPa-grade H2S corrosion resistant steel strip for oil pipes and preparation method thereof
A technology for oil pipes and steel strips, which is applied in the field of 555MPa H2S corrosion-resistant oil pipe steel strips and its preparation. It can solve the problems of low alloy content and achieve the effects of fine grain size, good SSCC resistance, and good HIC resistance.
Inactive Publication Date: 2019-10-08
MAANSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0004] The steel for oil pipes developed in the prior art pays more attention to the improvement of steel strength and toughness, and seldom focuses on the resistance to H 2 The development of steel strips for S corrosion oil pipes, therefore, is currently carried out with a relatively small alloy content and has anti-H 2 The development and popularization of S-corroded oil pipe steel strips are of positive significance to the development of oil pipe products and the improvement of the economic benefits of oil and gas fields
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[0029] The present invention will be described in detail below in conjunction with examples.
[0030] According to the chemical composition requirements provided by the present invention, molten iron pretreatment→converter steelmaking→alloy fine-tuning station→LF refining outside furnace→continuous casting process is adopted for smelting. After refining outside the LF furnace, the chemical composition in the steel meets the weight percentage (wt%): C: 0.08-0.14%, Si: 0.10-0.40%, Mn: 0.70-1.20%, Nb: 0.020-0.040%, Ti: 0.010 ~0.050%, Mo: 0.10~0.40%, Ni: 0.10~0.30%, Cu: 0.10~40%, Cr: 0.30~0.80%, S≤0.0020%, P≤0.015%, the rest is Fe and unavoidable impurities element. The whole process of continuous casting is protected casting, and the continuous casting slab is slowly cooled in the insulation pit for more than 72 hours.
[0031] The chemical composition of each embodiment of the present invention and comparative example is shown in Table 1. Composition detection is carried out ...
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Abstract
The invention discloses a 555 MPa-grade H2S corrosion resistant steel strip for oil pipes and a preparation method thereof. The steel strip comprises the following chemical components of, in percentage by weight, 0.08%-0.14% of C, 0.10%-0.40% of Si, 0.70%-1.20% of Mn, 0.010%-0.040% of Nb, 0.010%-0.050% of Ti, 0.10%-0.40% of Mo, 0.10%-0.30% of Ni, 0.10%-0.40% of Cu, 0.30%-0.80% of Cr, less than orequal to 0.0020% of S, less than or equal to 0. 015% of P and the balance Fe and inevitable impurity elements, the steel strip has the mechanical property of Rt being 0.5:570-621 MPa, Rm being 663-710MPa, and A being 50:24.0%-30.0%, the mechanical properties of finished products are stable, the grain size is 12-13 grades, the strip-shaped structure is less than or equal to 1.0 grade, and the steelstrip has the good HIC resistance and SSCC resistance performance.
Description
technical field [0001] The invention belongs to another technical basis for steel for oil pipes, and specifically relates to a 555MPa grade anti-H 2 S steel strip for corroding oil pipe and its preparation method. Background technique [0002] The service environment of the oil pipe has a direct impact on its service life. With the recent H 2 The increase of oil wells in S acidic working conditions is 2 The demand for oil pipes corroded by S is gradually increasing. [0003] Domestic anti-H 2 S-corroded oil pipes are mainly high-alloy seamless steel pipes, mainly including 13Cr series, super 13Cr series, nickel-based alloys, etc. There are many patent reports on this type of oil pipe products, and these materials mainly rely on the addition of a large amount of Cr, Ni, etc. Alloying elements to achieve the purpose of corrosion resistance. For some poor oil wells, the use of this type of oil well pipe will increase the production cost. Therefore, the relatively low cost...
Claims
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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50B22D11/115C21C7/064C21D1/84C21D6/00C21D9/00C21D8/02
CPCB22D11/115C21C7/064C21D1/84C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/04C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50
Inventor 胡学文朱涛杨森孙照阳李忠义余宣洵张宇光饶添荣
Owner MAANSHAN IRON & STEEL CO LTD