Unlock instant, AI-driven research and patent intelligence for your innovation.
Steel used for HIC-resistant pipe and preparation method of steel
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology for pipes and steel billets, which is applied in the field of steel for anti-HIC pipes and its preparation. It can solve the problems of increased wall thickness of steel pipes, increased difficulty in manufacturing hydrogen-prone pipes, and low alloy strength, and achieves the effect of strong HIC resistance.
Active Publication Date: 2020-07-31
FOSHAN UNIVERSITY +3
View PDF10 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0043] This example provides a steel for HIC resistant pipes, including the following components in mass percentage:
[0044] C: 0.05%, Cr: 1.20%, Cu: 0.80%, Ti: 1.0%, Sc: 0.15%, and the balance is Fe.
[0045] Among them, the S content is less than 0.01%, and the P content is less than 0.01%.
Embodiment 2
[0047] This example provides a method for preparing steel for HIC resistant pipes, including the following steps:
[0048] S1: Weigh the C, Cr, Cu, Ti, Sc, and Fe according to the ratio, and continuously cast after melting to obtain a steel billet;
[0049] S2: Heat the steel billet obtained in step S1 to obtain the HIC-resistant pipe steel.
[0050] among them. Heat treatment includes quenching and high temperature aging.
[0051] The quenching step is: heating the billet to 1100-1400°C at a heating rate greater than 300°C / s, holding it for 30 minutes, and then cooling it at the first cooling rate. The first cooling rate is greater than 100°C / s. The high-temperature aging step is: heating the billet to 700-750°C at a heating rate greater than 60°C / s, keeping it for 300 hours, and cooling it to a temperature lower than 50°C at a second cooling rate.
[0052] The second cooling rate is greater than 10°C / s.
Embodiment 3
[0054] This example uses the preparation method of Example 2 and refers to the formula of Example 1 to prepare a steel for HIC resistant pipes, which specifically includes the following components in mass percentages:
[0055] C: 0.02%, Cr: 1.40%, Cu: 1.0%, Ti: 0.6, Sc: 0.15%, the balance being Fe and impurity elements.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention provides steel used for an HIC-resistant pipe and a preparation method of the steel. The steel used for the HIC-resistant pipe comprises C, Cr, Cu, Ti, Sc and Fe and has high HIC resistance, and all HIC-sensitive indicators are zero. As for existing steel for the HIC-resistant pipe, although the HIC sensitivity of alloy can be reduced by designing low-carbon-content alloy, the strength of the alloy can be reduced. According to the steel used for the HIC-resistant pipe in the embodiment, a TiCuxSc phase is designed, so that the strength of the alloy steel is remarkably improved, and the hydrogenbrittleness sensitivity of the alloy is reduced.
Description
Technical field [0001] The invention belongs to the field of steel preparation, and specifically relates to a steel for HIC resistant pipelines and a preparation method thereof. Background technique [0002] The construction of pipeline network is the strategic demand of various countries. 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 sharply 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 demanding. For example, the transportation pressure increases, the transportation medium is complicated, and many pipelines need to pass through densely populated areas or deserts, swamps and severe cold areas, which puts forwar...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More