Steel plate having excellent hydrogen-induced cracking resistance and steel pipe for line pipe
A technology for anti-hydrogen-induced cracking and hydrogen-induced cracking, which is applied in the field of steel pipes for line pipes, and can solve problems such as inability to accurately evaluate HIC resistance
Inactive Publication Date: 2017-08-29
KOBE STEEL LTD
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Problems solved by technology
Therefore, in the above-mentioned method, fine internal cracks that are a problem in steel sheets requiring sulfur resistance are missed, and the HIC resistance caused by internal cracks cannot be accurately evaluated at the stage of casting.
Method used
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[0160] Hereinafter, the present invention is described in more detail by enumerating the examples, but the present invention is certainly not limited by the following examples, within the scope of being able to meet the purpose of the foregoing and the following, of course, it can also be appropriately modified and implemented, and these are all included in the present invention within the technical range.
[0161] In Table 1-1, Table 1-2, Figure 6 and Figure 7In , the experimental conditions and experimental results for determining the threshold tθ are shown. The slabs equivalent to APIX65 and APIX70 respectively cast 21 batches of charge respectively, and the slabs equivalent to ASME SA516 grade 60, ASME SA516 grade 65, and ASME SA516 grade 70 each cast 1 batch of charge respectively, Horizontal cracks were investigated as described below. Also, in the above-mentioned Table 1-1, Table 1-2 and Table 3 described later, "X70" indicates API X70 grade, "X65" indicates API X6...
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Abstract
Provided are a steel plate and a steel pipe that have excellent hydrogen-induced cracking resistance. Also provided are a steel plate and a steel pipe for which the HIC resistance thereof can be evaluated from the internal quality of a cast piece, without performing HIC tests. The steel plate having excellent hydrogen-induced cracking resistance fulfils prescribed C, Si, Mn, P, S, Al, Ca, N, and O content and comprises at least one element selected from the group consisting of a prescribed REM and Zr, with the remainder being iron and unavoidable impurities. The steel plate is characterized by: the Ca and S ratio (Ca / S) being at least 2.0; Ca, S, and O fulfilling (Ca - 1.25S) / O <= 1.80; and horizontal cracking not being present at the slab stage or the maximum opening thickness of horizontal cracking being no more than a threshold ttheta and the threshold ttheta being the maximum opening thickness of horizontal cracking at which hydrogen-induced cracking does not occur in a steel plate obtained by rolling the slab.
Description
technical field [0001] The present invention relates to a steel sheet excellent in hydrogen-induced cracking resistance. In particular, it relates to a steel plate excellent in hydrogen cracking resistance suitable for line pipes for transportation of natural gas and crude oil, storage tanks, and the like, and a steel pipe for line pipes excellent in hydrogen cracking resistance obtained by using the steel plate. Background technique [0002] Mainly in line pipes and storage tanks for transportation of oil and gas, so-called sulfur resistance, such as hydrogen induced cracking resistance and stress corrosion cracking resistance, is required along with the development of low-quality resources containing hydrogen sulfide. Hereinafter, a steel sheet having such sulfur resistance is referred to as a "sulfur-resistant steel sheet". Regarding hydrogen induced cracking (Hydrogen Induced Cracking, hereinafter referred to as "HIC"), it is known that the hydrogen intruded into the in...
Claims
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IPC IPC(8): C22C38/00C22C38/14C22C38/58C21C7/04C21D8/02
CPCC21D1/18C21D8/02C21D8/0226C21D8/0263C21D8/105C21D9/08C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/58C21D8/0221
Inventor 田代喜一郎加藤拓川野晴弥冈佑一佐藤进佑木村世意三宅孝司
Owner KOBE STEEL LTD