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Steel for anti-HIC pipeline based on cluster strengthening and preparation method thereof
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A pipeline and cluster technology, applied in the field of HIC-resistant pipeline steel based on cluster strengthening and its preparation, can solve the problems of shutdown loss, fire, perforation, etc., and achieve the effect of reducing HIC sensitivity and improving alloy strength
Active Publication Date: 2020-08-07
FOSHAN UNIVERSITY +3
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Problems solved by technology
It can not only cause perforation, leakage of oil, gas, water and other transported substances, but also cause waste of materials and manpower due to maintenance, losses caused by shutdown and production, and even cause fires, especially for natural gas. Explosion caused by pipeline corrosion threatens personal safety and pollutes the environment with extremely serious consequences
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Embodiment 1
[0045] This example provides a HIC-resistant pipeline steel based on cluster strengthening, including the following components in mass percentage:
[0046] C: 0.01-0.02%, Mn: 1.00-1.30%, Ni: 0.8-1.2%, Si: 1.00-1.40%, Cu: 0.70-1.30%, and the balance is Fe.
[0047] Wherein, the S content is less than 0.01%, and the P content is less than 0.01%.
Embodiment 2
[0049] This example provides a method for preparing HIC-resistant pipeline steel based on cluster strengthening, including the following steps:
[0050] S1: Weighing the C, Mn, Ni, Si, Cu and Fe according to the proportion, and continuous casting after melting to obtain a billet;
[0051] S2: heat-treating the steel slab obtained in step S1 to obtain the HIC-resistant pipeline steel based on cluster strengthening.
[0053] The step of quenching is: heating the steel slab to 880-1000° C. at a heating rate greater than 300° C. / s, and cooling at the first cooling rate after keeping the temperature for 30 minutes. The first cooling rate is greater than 100°C / s.
[0054] The step of tempering is: heating the billet to 300-500° C. at a heating rate greater than 60° C. / s, keeping it for 1000 hours, and then cooling to a temperature lower than 50° C. at a second cooling rate. During the tempering process, the ste...
Embodiment 3
[0056] In this example, using the preparation method of Example 2, referring to the formula of Example 1, a kind of HIC-resistant pipeline steel based on cluster strengthening is prepared, which specifically includes the following components in mass percentage:
[0057] C: 0.02%, Mn: 1.00%, Ni: 0.8%, Si: 1.40%, Cu: 0.7%, and the balance is Fe and impurity elements.
[0058]S content <0.01%. P content <0.01%.
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Abstract
The invention provides steel for an anti-HIC pipeline based on cluster strengthening and a preparation method thereof. The steel for the anti-HIC pipeline comprises elements such as C, Mn, Ni, Si andCu, has relatively good anti-HIC ability, and the HIC sensibility indexes are 0. By adopting an ultra-low carbon content alloy design, the HIC sensibility of the steel is reduced, and by means of long-time tempering treatment, high density CuNiMnSi cluters are introduced, so that the alloy strength is improved.
Description
technical field [0001] The invention belongs to the field of steel preparation, and in particular relates to a cluster-strengthened anti-HIC pipeline steel 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 higher techn...
Claims
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