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Texture adjustment and control based steel for HIC resisting pipeline and preparation method thereof
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A pipeline and tissue technology, applied in the field of anti-HIC pipeline steel and its preparation based on tissue regulation, can solve the problems of low alloy strength, increased wall thickness of steel pipelines, and increased difficulty in manufacturing hydrogen pipelines to achieve high strength Comprehensive performance, high HIC resistance performance, effect of grain refinement
Active Publication Date: 2020-08-07
FOSHAN UNIVERSITY +3
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Problems solved by technology
CN102839326B provides a kind of alloy with low carbon content, through controlled rolling and air-cooling process, relatively fine ferrite structure is obtained, HIC resistance performance is improved, but the alloy strength is low, the resistance strength is 437MPa, it is difficult to meet the requirements of high strength, good toughness, Comprehensive properties such as hydrogen-induced cracking resistance
The increasingly large and high-pressure requirements of hydrogen pipelines make the wall thickness of steel pipelines continue to increase, which further increases the difficulty of manufacturing such hydrogen pipelines.
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Embodiment 1
[0055]This example provides a kind of anti-HIC pipeline steel based on tissue regulation, including the following components in mass percentage:
[0056] C: 0.01-0.1%, Mn: 0.50-1.00%, Nb: 0.01-0.10%, Cr: 1.0-1.5%, Mo: 0.5-1.5%, V: 0.05-0.20%, B: 0.05-0.10%, N : 0.01 to 0.02%, Zr: 0.01 to 0.2%, and the balance is Fe.
[0057] Wherein, the S content is less than 0.01%, and the P content is less than 0.01%.
Embodiment 2
[0059] This example provides a method for preparing steel for anti-HIC pipelines based on tissue regulation, including the following steps:
[0060] S1: Weighing the C, Mn, Nb, Cr, Mo, V, B, N, Zr and Fe according to the proportion, and continuous casting after melting to obtain a billet;
[0061] S2: subjecting the billet obtained in step S1 to controlled rolling and controlled cooling treatment to obtain the HIC-resistant pipeline steel based on microstructure control.
[0062] Among them, controlled rolling and controlled cooling include rough rolling, finishing rolling and water cooling in sequence. The starting temperature of rough rolling is 1070°C, and the reduction ratio of a single pass is greater than 15%. The thickness of the intermediate slab for finishing rolling is 60mm. The start rolling temperature of finish rolling is 900°C. The water inlet temperature of the water cooling process is 780°C, the cooling rate is 13°C / s, and the final cooling temperature is 62...
Embodiment 3
[0064] In this example, using the preparation method of Example 2, referring to the formula of Example 1, a kind of anti-HIC pipeline steel based on tissue regulation is prepared, which specifically includes the following components in mass percentage:
[0065] C: 0.1%, Mn: 0.80%, Nb: 0.05%, Cr: 1.5%, Mo: 0.6%, V: 0.06%, B: 0.05%, N: 0.015%, Zr: 0.15%, the balance is Fe and impurity elements.
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Abstract
The invention provides texture adjustment and control based steel for an HIC resisting pipeline and a preparation method thereof. The steel has higher HIC resisting capacity; the HIC sensibility indexes of steel are 0; through adding trace amount of B, N, V Zr and other microelements, high-stability high-temperature second phase of (V, B) N and (Nb, B)xN is designed, the grain can be effectively refined through the cooling and rolling controlling process, and the grain size is reduced to about 1 micron; and through adjusting and controlling uniform distribution of the Mo element, high HIC resisting performance and high-strength overall performance are realized.
Description
technical field [0001] The invention belongs to the field of steel preparation, and in particular relates to a steel for anti-HIC pipelines based on tissue regulation and a preparation method thereof. Background technique [0002] Pipeline network construction is a strategic requirement. Natural gas pipeline transportation has the characteristics of high efficiency, economy and safety, and is the main form of long-distance gas transportation. With the gradual changes in the international energy structure, the proportion of natural gas in energy will increase dramatically in the next few decades. The development of natural gas pipelines tends to be large-diameter, high-pressure and thick-walled. The service conditions of pipelines are becoming more and more stringent, such as the increase of transmission pressure, complex transmission medium, and many pipelines need to pass through densely populated areas or deserts, swamps and severe cold regions, etc., which put forward h...
Claims
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