A kind of x65 grade thick specification pipeline steel composite plate and its manufacturing method
A manufacturing method and technology for pipeline steel, which are applied in manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of poor toughness of core materials, difficult performance indicators, and increased difficulty in segregation control of central inclusions. Sex-reducing effect
Active Publication Date: 2019-10-25
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
On the one hand, the difficulty of controlling the segregation of the central inclusions is greatly increased. On the other hand, due to the central segregation, the unevenness of the composition distribution is more obvious, and the control of the uniformity of the structure is more difficult, which will also cause the toughness of the core material to deteriorate.
In addition, due to the increase in the thickness of the final pipeline steel plate, the concentrated stress at the middle thickness of the pipeline steel plate is greater. For the same material, in the drop weight tear test, the pipeline steel plate with a larger thickness specification has a higher fracture brittle area. Therefore, in terms of crack arrest performance of steel pipes, it becomes more difficult to meet the DWTT performance index of API pipeline steel
Method used
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Embodiment A1-A6
[0056] Table 1 lists the mass percentages of the chemical elements of the X65 grade thick-gauge pipeline steel clad plates of the embodiments A1-A6 and the conventional single blank non-clad steel plates of the B1-B2.
[0057] Table 1. (wt%, the balance is Fe and other unavoidable impurities except P and S)
[0058] C Si mn P S Al Ni Cr Mo Cu Ti Nb V A1 0.055 0.24 1.70 0.010 0.002 0.035 0.15 0.19 0.005 0 0.008 0.052 0.001 A2 0.055 0.24 1.70 0.010 0.002 0.035 0.15 0.19 0.005 0 0.008 0.052 0 A3 0.03 0.25 1.70 0.008 0.002 0.030 0.25 0.20 0.12 0 0.01 0.06 0.05 A4 0.06 0.20 0.92 0.010 0.002 0.030 0.15 0.15 0.10 0.11 0.01 0.05 0.001 A5 0.07 0.25 1.40 0.011 0.002 0.035 0.10 0.05 0 0 0.009 0.04 0.001 A6 0.09 0.24 1.2 0.013 0.002 0.025 0.25 0 0 0 0.008 0 0 B1 0.053 0.24 1.70 0.010 0.002 0.035 0.15 0.19 0 0 0.008 0.052 0.001 B2 0.09 0.2...
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Abstract
The invention discloses an X65 thick heavy gauge pipeline steel composite board which is prepared by rolling homogeneous billets of two or more than two layers in a compounded manner. The X65 thick heavy gauge pipeline steel composite board comprises the following chemical elements in percentages by mass: 0.01-0.10% of C, 0.10-0.40% of Si, 0.5-1.7% of Mn, 0.02-0.04% of Al and the balance of Fe andinevitable impurities. Correspondingly, the invention also discloses a manufacturing method of the X65 thick heavy gauge pipeline steel composite board. Compared with a conventional single-billet non-compound pipeline steel plate, the X65 thick heavy gauge pipeline steel composite board has a more excellent shearing area percentage, so that the steel pipe in a low-temperature using process is ofhigher safety.
Description
technical field [0001] The invention relates to a composite plate and a manufacturing method thereof, in particular to a pipeline steel composite plate and a manufacturing method thereof. Background technique [0002] Pipeline steel pipe is an important way in the field of oil and gas transportation. It is especially suitable for areas with harsh environments, or for long-distance transportation. For example, the laying of submarine pipelines, or the exploitation of oil and gas in extremely cold regions, all need to be transmitted through pipeline steel pipes. At the same time, in order to reduce transportation costs and improve transmission efficiency, oil exploration companies hope to use large diameter and high transmission pressure to increase oil and gas transmission volume. Therefore, according to the relationship between pressure and pipe diameter and thickness, it is generally necessary to design a larger thickness of pipeline steel to ensure the safety of oil and ...
Claims
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IPC IPC(8): B21B1/38B21B47/02C22C38/02C22C38/04C22C38/06
Inventor 梁晓军焦四海丁建华袁向前苏大雄王波李占杰
Owner BAOSHAN IRON & STEEL CO LTD