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A kind of steel for anti-HIC pipeline based on cluster strengthening and its preparation method

A pipeline and cluster technology, which is applied in the field of cluster-strengthened anti-HIC pipeline steel and its preparation, can solve problems such as shutdown loss, fire, and environmental pollution, and achieve the effect of reducing HIC sensitivity and improving alloy strength

Active Publication Date: 2021-08-03
FOSHAN UNIVERSITY +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A kind of steel for anti-HIC pipeline based on cluster strengthening and its preparation method
  • A kind of steel for anti-HIC pipeline based on cluster strengthening and its preparation method
  • A kind of steel for anti-HIC pipeline based on cluster strengthening and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

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.

[0052] Among them, heat treatment includes quenching and tempering.

[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 a HIC-resistant pipeline steel based on cluster strengthening and a preparation method thereof. The HIC-resistant pipeline steel contains elements such as C, Mn, Ni, Si and Cu, and has strong anti-HIC capability. Sensitivity indicators are all 0. And the ultra-low carbon content alloy design is adopted to reduce the HIC sensitivity of the steel, and through long-term tempering treatment, high-density CuNiMnSi clusters are introduced to improve the alloy strength.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/08C22C38/04C22C38/02C21D1/18
CPCC21D1/18C22C38/02C22C38/04C22C38/08C22C38/16
Inventor 聂宝华赵吉诗陈东初赵连玉王子缘
Owner FOSHAN UNIVERSITY