Method for smelting high-grade pipe line steel with RH single-link process

A high-grade, pipeline steel technology, applied in the field of steelmaking, can solve the problems of lower temperature, high cost, and long cycle in the refining process, and achieve the effects of simplifying the smelting process, making up for heat loss, and reducing production costs

Active Publication Date: 2014-01-29
SHOUGANG CORPORATION
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Problems solved by technology

Chinese patent 102732666A "Method for Controlling Non-metallic Inclusions in Medium and Heavy Plates of Anti-Hydrogen-Induced Cracking Pipeline Steel" discloses a method for deep desulfurization and control of inclusions on the basis of this dual-operation smelting pipeline steel process. There are disadvantages of long cycle and high cost
[0004] Chinese patent 200910084425.4 "A Method for Producing Pipeline Steel J55 by RH Refining Process" uses a single RH process to produce pipeline steel. This method is only for the production of J55 grade pipeline steel in a 210-ton converter, and the mass per

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  • Method for smelting high-grade pipe line steel with RH single-link process
  • Method for smelting high-grade pipe line steel with RH single-link process
  • Method for smelting high-grade pipe line steel with RH single-link process

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[0030] Example 1

[0031] During the converter tapping process, before the tapping volume reaches 1 / 3 stage, add aluminum and iron to the molten steel, and control the mass percentage of aluminum in the molten steel to 0.13% after the deoxidation is completed (see Table 1); the tapping volume reaches 1 In the / 3 to 2 / 3 stage, add lime 8kg / t steel to the molten steel. After tapping, use a top gun to blow argon into the molten steel for strong stirring. The argon blowing intensity is controlled to 5NL / min / t steel, and the argon blowing time is 8 minutes. After the molten steel is blown with argon, perform the RH vacuum treatment. After vacuuming for 3.5 minutes and the vacuum degree is 984 Pa, add the desulfurizing agent to the molten steel through the vacuum silo. After adding the desulfurizing agent, keep the vacuum degree at 992 Pa, continue RH vacuum cycle treatment of molten steel for 3 minutes (see Table 2), further deep desulfurization of molten steel. Among them, the amou...

Example Embodiment

[0032] Example 2

[0033] During the converter tapping process, before the tapping volume reaches 1 / 3 stage, add aluminum and iron to the molten steel, and control the mass percentage of aluminum in the molten steel to 0.12% after the deoxidation is completed (see Table 1); the tapping volume reaches 1 / 3 to 2 / 3 stage, add lime 9kg / t steel to the molten steel. After tapping, the top gun is used to blow argon into the molten steel for strong stirring, the argon blowing intensity is controlled to 7NL / min / t steel, and the argon blowing time is 5 minutes. After the molten steel is blown with argon, the RH vacuum treatment is carried out. After the vacuum is drawn for 4.5 minutes and the vacuum degree is 923 Pa, the desulfurization agent is added to the molten steel through the vacuum silo. After the desulfurization agent is added, the vacuum degree is maintained at 984 Pa, continue RH vacuum cycle treatment of molten steel for 3 minutes (see Table 2), further deep desulfurization of...

Example Embodiment

[0034] Example 3

[0035] During the converter tapping process, before the tapping volume reaches 1 / 3 stage, add aluminum and iron to the molten steel to control the mass percentage of aluminum in the molten steel to 0.15% after deoxidation (see Table 1); the tapping volume reaches 1 / 3 to 2 / 3 stage, add lime 10kg / t steel to the molten steel. After tapping, use a top gun to blow argon into the molten steel for strong stirring. The argon blowing intensity is controlled to 6NL / min / t steel, and the argon blowing time is 7 minutes. After the molten steel is blown with argon, the RH vacuum treatment is carried out. After the vacuum is drawn for 4.5 minutes and the vacuum degree is 977Pa, the desulfurization agent is added to the molten steel through the vacuum silo. After the desulfurization agent is added, the vacuum degree is maintained at 992Pa. RH vacuum cycle treatment of molten steel for 3 minutes (see Table 2), further deep desulfurization of molten steel. Among them, the amo...

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Abstract

The invention provides a method for smelting high-grade pipe line steel with a RH single-link process. During a converter tapping process, high aluminum content in molten steel is controlled, such that desulfurization and impurity control in subsequent refining process can be benefited. During an RH vacuum refining stage, a desulfurization agent is added, and S content in the molten steel is controlled no higher than 0.0020%; oxygen blowing is carried out upon the molten steel, and a reaction is carried out between oxygen and aluminum in the molten steel, such that aluminum content in the molten steel is controlled at 0.03-0.05%. Also, heat loss during the desulfurization process is supplemented, and the impurity is converted into mainly clustered Al2O3 impurity which is easy to remove; and calcium treatment and soft blowing are carried out, such that the impurities in molten steel is mainly CaS impurities of small particles with deformation coefficient close to 1. According to the method provided by the invention, X80 pipeline steel quality requirement can be achieved, production process flow is short, and cost can be substantially reduced.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for smelting high-grade pipeline steel by using an RH single-pass process. Background technique [0002] The strength and low-temperature impact toughness of pipeline steel are its important performance indicators. Therefore, in the smelting process of pipeline steel, deep desulfurization and inclusion control are the key technologies. The goal of control is that the mass fraction of sulfur in the finished product is ≤0.0020%. [0003] Pipeline steel smelting has many quality requirements and is difficult. At present, the conventional pipeline steel smelting steps are double operations: converter blowing→LF refining→RH refining→slab continuous casting. Chinese patent 102732666A "Method for Controlling Non-metallic Inclusions in Medium and Heavy Plates of Anti-Hydrogen-Induced Cracking Pipeline Steel" discloses a method for deep desulfurization and control of inclusio...

Claims

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Application Information

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IPC IPC(8): C21C7/10
Inventor 李海波朱国森高攀邵肖静吕迺冰杨健马耀峰亢小敏
Owner SHOUGANG CORPORATION
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