Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of HIC-resistant pipeline steel and preparation method thereof

A technology for pipes and billets, which is applied in the field of HIC-resistant pipeline steel and its preparation, can solve the problems of increasing the wall thickness of steel pipelines, increasing the difficulty of manufacturing hydrogen-adjacent pipelines, and low alloy strength, and achieving the effect of strong HIC-resistant capability.

Active Publication Date: 2021-03-26
FOSHAN UNIVERSITY +3
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
  • A kind of HIC-resistant pipeline steel and preparation method thereof
  • A kind of HIC-resistant pipeline steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example provides a steel for HIC-resistant pipelines, including the following components in mass percentages:

[0044] C: 0.05%, Cr: 1.20%, Cu: 0.80%, Ti: 1.0%, Sc: 0.15%, and the balance is Fe.

[0045] Wherein, the S content is less than 0.01%, and the P content is less than 0.01%.

Embodiment 2

[0047] This example provides a preparation method of steel for HIC-resistant pipelines, including the following steps:

[0048] S1: Weighing the C, Cr, Cu, Ti, Sc and Fe according to the proportion, and continuous casting after melting to obtain a billet;

[0049] S2: heat-treating the billet obtained in step S1 to obtain the HIC-resistant pipeline steel.

[0050] in. Heat treatment includes quenching and high temperature aging.

[0051] The step of quenching is: heating the billet to 1100-1400° 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. The step of high-temperature aging is: heating the billet to 700-750° C. at a heating rate greater than 60° C. / s, keeping it for 300 hours, and then cooling 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 adopts the preparation method of Example 2, and with reference to the formula of Example 1, a kind of HIC-resistant pipeline steel is prepared, which specifically includes the following components in mass percentage:

[0055] C: 0.02%, Cr: 1.40%, Cu: 1.0%, Ti: 0.6, Sc: 0.15%, and the balance is Fe and impurity elements.

[0056] S content <0.01%. P content <0.01%.

[0057] In the preparation method, the heating temperature of the billet during quenching is 1250° C., and the heating temperature of the billet during high-temperature aging is 725° C.

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

No 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 hydrogen brittleness sensitivity of the alloy is reduced.

Description

technical field [0001] The invention belongs to the field of steel preparation, and in particular relates to a steel for HIC-resistant pipelines and a preparation method thereof. Background technique [0002] Pipeline network construction is a strategic requirement of each country. 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 ...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/20C22C38/28C21D6/00C21D1/18
CPCC21D1/18C21D6/002C22C38/005C22C38/20C22C38/28
Inventor 聂宝华赵吉诗陈东初赵连玉王子缘
Owner FOSHAN UNIVERSITY