Technique for refined production of antiacid pipeline steel through VD-LF-VD

A VD-LF-VD, pipeline steel technology, applied in the direction of process efficiency improvement, manufacturing converters, etc., can solve the problem of not being able to meet the design requirements of high-grade pipeline steel anti-HIC and SCC components, so as to reduce production burden and eliminate The adverse effects of carburization and the effect of increasing furnace life

Inactive Publication Date: 2012-09-19
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only low-carbon or ultra-low-carbon design is carried out in the composition control of molten steel, and the sulfur content control

Method used

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  • Technique for refined production of antiacid pipeline steel through VD-LF-VD
  • Technique for refined production of antiacid pipeline steel through VD-LF-VD

Examples

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Embodiment

[0036] Implementation example: A steel plant in the Central Plains of my country applies the process of the present invention to smelt acid-resistant (HIC and SCC) X65 pipeline steel. The specific process: hot metal pre-desulfurization-converter smelting-VD refining (decarburization and deoxidation)-LF refining (heating desulfurization) - VD refining (decarburization and degassing) - slab continuous casting - hot rolling production of acid-resistant X65 pipeline steel with a thickness of 25.2mm, the carbon content of the finished steel is controlled at <0.04%, the sulfur content is less than 0.0009%, and the steel plate is rolled into a tube Finally, it fully meets the requirements of the acid resistance test. See the table below for the quality comparison of the single vacuum (LF-VD) process and the double vacuum (VD-LF-VD) process pipeline steel pipe after sampling.

[0037] Table 1

[0038]

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PUM

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Abstract

The invention relates to a technique for refined production of antiacid pipeline steel through VD-LF-VD. According to the technique, elements of molten steel are controlled by utilizing a converter crude refining and RH-LF-RH refining technique to produce low-carbon low-sulfur antiacid (HIC-resisting and SCC-resisting) pipeline steel. The technique comprises the following specific flow of: molten steel pre-desulfurization, converter smelting, first VD vacuum refining, LF refining desulfurization, second VD vacuum refining and continuous casting. By utilizing the second VD vacuum refining technique, the technique for the refined production of the antiacid pipeline steel through the VD-LF-VD, disclosed by the invention, has the advantages of reducing decarburization load of the converter and oxidability of the molten steel, eliminating negative influence of carbon increase in an LF refining process, reducing the use of a strong deoxidizer, stabilizing production, ensuring that the elements of the molten steel are stably controlled within production targets, and meeting requirements of the antiacid pipeline steel on low carbon, low sulfur and high-purity element control. Through finished-product steel produced by the technique disclosed by the invention, the content of carbon can be stably controlled to 0.03-0.04%, and the content of sulfur can be stably controlled to be smaller than or equal to 0.0010%.

Description

technical field [0001] The invention belongs to the field of smelting and production of high-grade acid-resistant pipeline steel, and relates to a smelting process for accurately controlling the composition of steel by using converter steelmaking and VD-LF-VD refining. and tapping temperature, prolong the service life of the converter, and give full play to the desulfurization effect of LF furnace refining. High temperature, uniform heat composition, stable production process, strong operability, and meet the composition control requirements of acid-resistant (HIC and SCC) pipeline steel for low carbon, low sulfur and high purity. Background technique [0002] Pipeline transportation is the most economical and reasonable transportation method for long-distance transportation of oil and natural gas, and it has the characteristics of high efficiency, economy and safety. At present, the transmission pipeline is developing in the direction of large diameter and high pressure. ...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/068C21C7/064C21C5/35
CPCY02P10/20
Inventor 成泽伟王永胜
Owner UNIV OF SCI & TECH BEIJING
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