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Super-thick X70 pipeline steel and manufacturing method thereof

A technology of pipeline steel and specifications, applied in the field of X70 submarine pipeline steel and its manufacturing, can solve the problems of decline of pipeline steel, increase of cost, shortening of service period of pipeline steel, etc., to improve production efficiency, stabilize production process and save straightening cost Effect

Active Publication Date: 2015-01-07
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the harsh service environment of submarine steel, the strength, toughness, and plasticity of pipeline steel will decrease after a certain period of time, resulting in shortened service period and increased cost of pipeline steel. Therefore, improving the strain aging performance of submarine pipeline steel is also It is an urgent subject for those skilled in the art to explore

Method used

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  • Super-thick X70 pipeline steel and manufacturing method thereof
  • Super-thick X70 pipeline steel and manufacturing method thereof
  • Super-thick X70 pipeline steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The thickness of the extra-thick X70 pipeline steel involved in this example is 31.8mm, and its chemical composition is calculated by mass percentage: C: 0.04%, Si: 0.2%, Mn: 1.44%, P: 0.009%, S: 0.002% , Nb: 0.045%, Ti: 0.017%, Ni: 0.2%, Cr: 0.10%, Cu: 0.16%, and the balance is Fe and unavoidable impurity elements.

[0033] The 31.8mm thick extra-thick X70 pipeline steel corresponds to the production furnace number S21104062. The manufacturing process is to configure the smelting raw materials according to the chemical composition of the above-mentioned extra-thick X70 pipeline steel, and then perform KR molten iron pretreatment in sequence to control the S content to 0.002%. , enter the converter after slag removal; double slag method is used in converter smelting to remove P, the content of P is 0.009%, and the content of C at the end of converter smelting is controlled to be 0.04%; blow argon for 10 minutes; then carry out LF refining and RH vacuum degassing, RH vac...

Embodiment 2

[0037] The thickness of the extra-thick specification X70 pipeline steel involved in this example is 31.8mm, and its chemical composition is calculated by mass percentage: C: 0.04%, Si: 0.15%, Mn: 1.44%, P: 0.007%, S: 0.002% , Nb: 0.045%, Ti: 0.017%, Ni: 0.2%, Cr: 0.10%, Cu: 0.16%, and the balance is Fe and unavoidable impurity elements.

[0038] The 31.8mm thick extra-thick X70 pipeline steel corresponds to the production furnace number S21104062. The manufacturing process is to configure the smelting raw materials according to the chemical composition of the above-mentioned extra-thick X70 pipeline steel, and then perform KR molten iron pretreatment in sequence to control the S content to 0.002%. , enter the converter after slag removal; double slag method is used in converter smelting to remove P, the content of P is 0.007%, and the content of C at the end of converter smelting is controlled to be 0.04%; blow argon for 15 minutes; then carry out LF refining and RH vacuum deg...

Embodiment 3

[0042] The thickness of the extra-thick specification X70 pipeline steel involved in this embodiment is 32 mm, and its chemical composition is calculated by mass percentage: C: 0.03%, Si: 0.24%, Mn: 1.43%, P: 0.009%, S: 0.0015%, Nb: 0.044%, Ti: 0.015%, Ni: 0.19%, Cr: 0.10%, Cu: 0.13%, and the balance is Fe and unavoidable impurity elements.

[0043] The 32mm thick extra-thick X70 pipeline steel corresponds to the production furnace number S21104060. Its manufacturing process is to configure the smelting raw materials according to the chemical composition of the above-mentioned extra-thick X70 pipeline steel, and then perform KR molten iron pretreatment in sequence to control the S content to 0.0015%. After slag removal, it enters the converter; the double slag method is used to remove P in the converter smelting, the content of P is 0.009%, and the content of C is controlled at the end of the converter smelting to 0.03%; blowing argon for 10 minutes; followed by LF refining and...

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Abstract

The invention discloses super-thick X70 pipeline steel and a manufacturing method thereof, wherein the pipeline steel is 30-32mm thick, and the pipeline steel comprises the following chemical ingredients in percentage by mass: 0.03-0.06% of C, 0.1-0.30% of Si, 1.30-1.60% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0050% of S, 0.030-0.050% of Nb, 0.008-0.020% of Ti, 0.10-0.30% of Ni, 0.l0-0.30% of Cr, 0.10-0.30% of Cu and the balance being Fe and inevitable impurity elements. smelting raw materials are sequentially subjected to KR molten iron pretreatment, converter smelting, LF refining and RH vacuum degassing to obtain molten steel which is relatively high in purity, and then the pipeline steel, which is high in thickness, high in strength, narrow in strength interval, excellent in low-temperature toughness, and excellent in both low-temperature resistant aging performance and HIC resistance, is obtained through a controlled rolling and controlled cooling process.

Description

technical field [0001] The invention relates to X70 submarine pipeline steel and a manufacturing method thereof, in particular to an X70 pipeline steel with a thickness of more than 30 mm, a narrow strength range, excellent low-temperature toughness, HIC resistance, and low-temperature strain aging resistance and a manufacturing method thereof . Background technique [0002] With the rapid development of the world economy and the depletion of energy resources, the focus of oil and gas development has shifted from land to sea. Subsea oil and gas pipelines are the main components of offshore oil and gas field development and production systems. It is the fastest, safest and most efficient way to continuously transport large amounts of oil and gas An economical and reliable transportation method, it has been widely used in offshore oil transportation. For example, a 37,000Km ocean pipeline has been built in the US Gulf of Mexico, and the deepest gas pipeline reaches 2,900m. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C22C33/04C21D8/02B22D11/00
Inventor 李经涛刘朝霞林涛孙宪进蒋昌林方寿玉
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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