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Low-steel-grade pipeline clean steel and smelting process

A technology of clean steel and steel grade, applied in the field of metallurgy, can solve the problems of unqualified ultrasonic flaw detection of welding cracks, reduce the mechanical properties of steel plates, etc., and achieve the effect of reducing center segregation, reducing gas content, and preventing the formation of MnS inclusions.

Inactive Publication Date: 2019-02-12
NANJING IRON & STEEL CO LTD
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Problems solved by technology

Pipeline steel is mainly used for oil, natural gas and other transportation pipelines. The performance of the product should meet the needs of extreme cold regions, high-pressure transportation, high-strength ultra-low temperature impact toughness, and long-distance transportation. It must also have good welding performance. Inclusions will lead to welding cracks and unqualified ultrasonic flaw detection, reducing the mechanical properties of the steel plate

Method used

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  • Low-steel-grade pipeline clean steel and smelting process
  • Low-steel-grade pipeline clean steel and smelting process
  • Low-steel-grade pipeline clean steel and smelting process

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Embodiment Construction

[0031] The invention provides a low-grade pipeline clean steel, the chemical composition and mass percentage of which are as follows: C: 0.04% to 0.07%, Si: 0.10% to 0.35%, Mn: 1.00% to 1.50%, P≤0.015%, S :0.0020%~0.0050%, Nb:0.030%~0.070%, Ti:0.006%~0.020%, Ni≤0.30%, Cr≤0.30%, Cu≤0.30%, Al:0.015%~0.050%, the balance is Fe and impurities.

[0032] The smelting process includes the following processes:

[0033] S1. The desulfurization station adopts the mixed injection method of liquid calcium oxide and magnesium powder for desulfurization. After desulfurization, deep slag removal treatment is carried out. The desulfurization standard of the desulfurization station is ≤0.005%. Tapping and adding aluminum blocks for strong deoxidation, the addition amount is 35kg / 100ppm, to prepare for LF desulfurization;

[0034] S2 and LF are mainly responsible for desulfurization and alloying, and the finished product sulfur is set at 0.002% to 0.005%;

[0035] S3, RH vacuum treatment, the...

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Abstract

The invention discloses a low-steel-grade pipeline clean steel, and relates to the technical field of metallurgy. The low-steel-grade pipeline clean steel comprises the following chemical components of, by mass, 0.04%-0.07% of C, 0.10%-0.35% of Si, 1.00%-1.50% of Mn, less than or equal to 0.015% of P, 0.0020%-0.0050% of S, 0.030%-0.070% of Nb, 0.006%-0.020% of Ti, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cr, less than or equal to 0.30% of Cu, 0.015%-0.050% of Al, and the balance Fe and impurities. According to the smelting process, system accurate analysis is carried out on a formation control mechanism of inclusions, a reasonable component design is adopted, a calcium treatment process is carried out after RH vacuum treatment, the degree of superheat is reasonablycontrolled, so that the purpose of improving the purity of the molten steel is achieved, the internal quality of the steel is improved, and the economic benefits are improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a low-grade pipeline clean steel and a smelting process. Background technique [0002] With the increasing demand for energy in the world economy, the dependence on pipeline transportation of oil and natural gas is increasing, and the service environment requirements of pipelines are becoming more and more stringent. The safety and reliability of pipelines cannot be separated from the quality assurance of steel materials, which have high clean Only steel plates with high temperature and good low temperature toughness can occupy the market. Pipeline steel is mainly used for oil, natural gas and other transportation pipelines. The performance of the product should meet the needs of extreme cold regions, high-pressure transportation, high-strength ultra-low temperature impact toughness, and long-distance transportation. It must also have good welding performance. Inclusions will...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C38/48C22C38/42C22C38/06C22C38/04C22C38/02C21C7/064C21C7/10B22D37/00B22D27/02
CPCB22D27/02B22D37/00C21C7/0056C21C7/064C21C7/10C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50Y02P10/20
Inventor 翟冬雨张媛钰吴俊平方磊姜金星刘继红倪卫莹杜海军员强鹏殷杰刘汝营刘仁杰
Owner NANJING IRON & STEEL CO LTD
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