Magnesium-containing X65 pipeline steel with good acid resistance and production method

A technology of X65 and pipeline steel, which is applied in metal rolling, manufacturing tools, temperature control, etc., can solve the problems of unfavorable pipeline steel resistance to HIC and SSCC, and achieve the goal of improving HIC and SSCC performance, reducing structure segregation, and increasing strength Effect

Active Publication Date: 2020-09-25
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing composition system is not conducive to the HIC and SSCC resistance of pipeline steel

Method used

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  • Magnesium-containing X65 pipeline steel with good acid resistance and production method
  • Magnesium-containing X65 pipeline steel with good acid resistance and production method
  • Magnesium-containing X65 pipeline steel with good acid resistance and production method

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Embodiment Construction

[0043] The present invention is described in detail below:

[0044] Table 1 is the value list of each embodiment of the present invention and comparative example chemical composition;

[0045] Table 2 is the value list of the main process parameters of each embodiment of the present invention and comparative examples;

[0046] Table 3 is each embodiment of the present invention and comparative example horizontal main mechanical property detection statistical table;

[0047] Table 4 is each embodiment of the present invention and comparative example anti-HIC performance statistical table

[0048] Table 5 is a statistical table of anti-SSCC performance of each embodiment of the present invention and comparative examples.

[0049] Each embodiment is produced according to the following steps:

[0050] 1) After smelting in a converter and performing Mg treatment in a vacuum, it is cast into a billet; during the vacuum treatment, add Mg wire to the ladle at a feeding speed of 2-5...

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Abstract

The invention provides magnesium-containing X65 pipeline steel with good acid resistance. The magnesium-containing X65 pipeline steel is prepared from the components in percentage by weight: 0.03-0.05% of C, 0.17-0.20% of Si, 0.40-0.70% of Mn, 0.12-0.15% of Ni, 0.45-0.48% of Cr, 0.10-0.15% of Mo, 0.002-0.004% of Mg, 0.06-0.09% of Nb, 0.01-0.02% of Ti, less than or equal to 0.008% of P, and less than or equal to 0.010% of S. A production method comprises the steps that casting billet is carried out after converter smelting and Mg vacuum treatment; the casting billet is heated; roughing is carried out; finish rolling is carried out; laminar cooling is carried out; and reeling is carried out. Under the premise of ensuring Rt 0.5 is 420-440 MPa, Rm is 480-500 MPa, and Rt 0.5/Rm is less than orequal to 0.90, the elongation after fracture A50mm is greater than or equal to 20%, -20DEG C impact energy KV2 is greater than or equal to 200J, a shearing surface ratio DWTT SA of a -15 DEG C fracture is greater than 90%, a hardness value HV10 is less than or equal to 180, in a NACE A solution, the hydrogen-induced crack sensitivity CLR, CTR and CSR do not exceed 0.05%, and sulfide stress cracking cannot happen under the 0.9 stress loading rate.

Description

technical field [0001] The invention relates to a pipeline steel and a production method, in particular to a magnesium-containing X65 acid-resistant pipeline steel and a production method. Background technique [0002] With the development of my country's economy and society, the demand for oil and gas resources is huge, and the country is vigorously building oil and gas pipeline networks. However, oil and gas resources are often rich in H 2 In acidic media such as S, pipeline steel will interact with H in the process of transporting oil and gas 2 The S phase contacts and reacts, hydrogen-induced cracking (HIC) and hydrogen sulfide stress corrosion cracking (SSCC) occur, which eventually lead to the failure of pipeline steel, resulting in large economic losses and environmental pollution. In order to ensure the reliability of my country's oil and gas pipeline network, for the transmission of H 2 Sour oil and gas pipelines such as S must use acid-resistant pipeline steel. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50B21B37/74B21B15/00C21C7/10C21C7/00
CPCB21B15/00B21B37/74B21B2015/0057C21C7/0006C21C7/0056C21C7/10C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50
Inventor 郎丰军杨海林岳江波程鹏彭浩李利巍马颖李江文陈勇
Owner 武汉钢铁有限公司
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