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High-strength steel having excellent resistance to sulfide stress cracking, and method for manufacturing same

A stress corrosion cracking and anti-sulfide technology, applied in the field of thick steel, can solve the problems of reduced surface hardness and reduced steel strength

Active Publication Date: 2021-06-04
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this regard, as a technical solution to suppress the formation of high-hardness structures on the surface of steel, it is possible to consider slowing down the water cooling process, but slowing down water cooling not only reduces the hardness of the surface, but also leads to a decrease in the strength of the steel. Add more alloying elements

Method used

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  • High-strength steel having excellent resistance to sulfide stress cracking, and method for manufacturing same
  • High-strength steel having excellent resistance to sulfide stress cracking, and method for manufacturing same
  • High-strength steel having excellent resistance to sulfide stress cracking, and method for manufacturing same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0160] Billets having alloy compositions shown in Table 1 below were prepared. At this time, the content of the alloy composition is by weight %, and the balance is Fe and unavoidable impurities. According to the conditions in Table 2, the prepared steel slabs were heated, hot-rolled, and cooled to obtain various steel products.

[0161] Table 1:

[0162]

[0163] (In Table 1, P*, S*, N*, Ca* are expressed in ppm. In addition, Ar3=910-310×C-80×Mn-20×Cu-15×Cr-55×Ni-80×Mo+ 0.35×(thickness (mm)-8), Ar1=742-7.1×C-14.1×Mn+16.3×Si+11.5×Cr-49.7×Ni)

[0164] Table 2:

[0165]

[0166] The yield strength (YS), the Vickers hardness and the sulfide stress cracking resistance of the surface part and the center part were measured for each steel material obtained above, the microstructure was observed, and the results are recorded in Table 3.

[0167] In this case, the yield strength refers to the yield strength when the elongation under load (under-load) is 0.5%. For the tensile...

Embodiment 2

[0178] Billets having alloy compositions shown in Table 4 below were prepared. At this time, the content of the alloy composition is by weight %, and the balance is Fe and unavoidable impurities. According to the conditions in Table 5, the prepared steel slabs were heated, hot-rolled, and cooled to obtain various steel products.

[0179] Table 4:

[0180]

[0181] (In Table 4, P*, S*, N*, Ca* are expressed in ppm. In addition, Ar3=910-310×C-80×Mn-20×Cu-15×Cr-55×Ni-80×Mo+ 0.35×(thickness (mm)-8), Ar1=742-7.1×C-14.1×Mn+16.3×Si+11.5×Cr-49.7×Ni)

[0182] table 5:

[0183]

[0184]The yield strength (YS), the Vickers hardness of the surface and the center, and the resistance to sulfide stress cracking were measured for each of the steel materials prepared above, and the microstructure was observed. The results are recorded in Table 6 below.

[0185] In this case, the yield strength refers to the yield strength when the elongation (under-load, under load) is 0.5%. For the...

Embodiment 3

[0196] Billets having alloy compositions shown in Table 7 below were prepared. At this time, the content of the alloy composition is by weight %, and the balance is Fe and unavoidable impurities. According to the conditions in Table 8, the prepared steel slabs were heated, hot-rolled, and cooled to obtain various steel products. At this time, the steel billet that has completed the heating is used for rough rolling under normal conditions to obtain bars (bar), and then the bars of some steel types are cooled and then hot-rolled. The above-mentioned cooled bar (bar) is reheated to the austenite single-phase region.

[0197] Table 7:

[0198]

[0199] (In Table 7, P*, S*, N*, Ca* are expressed in ppm. In addition, Ar3=910-310×C-80×Mn-20×Cu-15×Cr-55×Ni-80×Mo+ 0.35×(thickness (mm)-8), Ar1=742-7.1×C-14.1×Mn+16.3×Si+11.5×Cr-49.7×Ni)

[0200] Table 8:

[0201]

[0202] The yield strength (YS), the Vickers hardness of the surface part and the central part, and the resistanc...

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Abstract

The present invention relates to a thick steel suitable for use as a line pipe, a sour-resistant material, or the like and, more specifically, to a high-strength steel having excellent resistance to sulfide stress cracking, and a method for manufacturing same.

Description

technical field [0001] The present invention relates to a thick steel material suitable for use as a line pipe and a sour material, and more specifically, to a high-strength steel material excellent in sulfide stress corrosion cracking resistance and a manufacturing method thereof. Background technique [0002] Recently, the upper limit limit on the surface hardness of line pipe steel is increasing. The high surface hardness of line pipe steel will not only cause problems such as uneven roundness during pipe processing, but also cause problems during pipe processing due to the high hardness structure of the pipe surface. Problems such as cracking in the middle or insufficient toughness in the use environment. In addition, when used in an acidic environment with a large amount of hydrogen sulfide, there is a high possibility that the high-hardness structure of the surface portion will be brittlely cracked by hydrogen, causing a large-scale accident. [0003] In 2013, in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/48C22C38/50C22C38/44C22C38/46C22C38/04C22C38/02C22C38/06C22C38/00C21D8/02
CPCC22C38/44C22C38/48C22C38/04C22C38/46C22C38/02C22C38/58C22C38/50C22C38/001C21D8/0226C21D8/0263C21D1/02C21D1/18C21D1/19C21D9/46C21D6/005C21D2211/001C21D2211/005C21D6/004C21D6/008C21D8/0205C22C38/002C22C38/06
Inventor 高声雄朴然桢李弘周金孝信裵茂锺
Owner 浦项股份有限公司
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