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Production technology for controlling B-type inclusions in pipeline steel

A technology for production process and inclusions, which is applied in the field of production process for controlling Type B inclusions in pipeline steel, can solve the problems of poor removal effect, low processing efficiency, and high energy consumption of Type B inclusions, and achieve reduced impact and simplified Production process, the effect of improving quality

Active Publication Date: 2019-07-12
湖南华菱涟源钢铁有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a production process for controlling B-type inclusions in pipeline steel, aiming at solving the problems of poor removal effect, high energy consumption and low processing efficiency of B-type inclusions in pipeline steel in the prior art question

Method used

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  • Production technology for controlling B-type inclusions in pipeline steel
  • Production technology for controlling B-type inclusions in pipeline steel
  • Production technology for controlling B-type inclusions in pipeline steel

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Embodiment 1

[0072] 210 tons of molten iron are subjected to KR desulfurization treatment, so that the sulfur content in the molten iron is controlled below 50ppm; then the top-bottom combined blowing converter is used to make steel, and the impact of molten steel is used to add 600Kg of lime + 200Kg of aluminum particles in the process of tapping for pre-slagging; Under the condition of controlling the flow rate of bottom-blowing argon gas to 200NL / min, turn on the power and raise the temperature to 1620°C, increase the flow rate of bottom-blowing protective gas to partially expose the molten steel, and add 525Kg of rare earth slag reforming agent to the exposed part of the molten steel for LF refining. After testing the composition and temperature of the molten steel to pass the test, carry out the 8-10min soft blowing inclusion floating process operation. Pipeline steel products are obtained through casting and rolling processes.

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Abstract

The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a production technology for controlling B-type inclusions in pipeline steel. The production technology sequentially comprises the processes of hot metal pretreatment, converter smelting, converter tapping, LF furnace refining and continuous casting, wherein the LF furnace refining process sequentially comprises the steps of energized heating treatment, B-type inclusion modification treatment and softblow treatment; the B-type inclusion modification treatment step comprises addition of a rareearth slag modification agent; calculated according to that the total mass percent of the rare earth slag modification agent is 100%, the rare earth slag modification agent comprises 50% to 60% of lime, 5% to 10% of rare earth, 20% to 25% of total aluminum and 5% to 15% of a fluxing agent. According to the production technology, the B-type inclusions in pipeline steel are controlled through the rare earth slag modification agent, the B-type inclusions in pipeline steel are converted into compound rare earth inclusions, removal of the B-type inclusions in a follow-up technology is facilitated,a traditional B-type inclusion calcium treatment production technology is simplified, and quality of pipeline steel is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a production process for controlling type B inclusions in pipeline steel. Background technique [0002] Pipeline steel is an economical, safe and uninterrupted mode of transportation, which plays a vital role in the transportation of oil and natural gas, roads, aviation and other fields. With the rapid increase in the demand and extraction of oil and natural gas, the demand for pipeline steel is also increasing, and the quality requirements for pipeline steel are more stringent. Pipeline steel should not only have good mechanical properties, that is, high yield strength, high toughness and good weldability, but also have good low temperature resistance and corrosion resistance, so as to prevent low temperature brittle fracture and fracture expansion of pipelines and Extensibility fracture propagation, etc. To improve these properties, on the one ha...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C7/072C21C1/02C21C7/06
CPCC21C1/025C21C7/06C21C7/072C21C7/076Y02P10/20
Inventor 周剑丰徐刚军罗钢梁亮肖爱达周军军谢世正董常福谭大进刘怡私
Owner 湖南华菱涟源钢铁有限公司
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