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Process for producing anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining

A technology of RH-LF-RH and pipeline steel, which is applied in the manufacture of converters, etc., can solve the problem of acid resistance (HIC and SCC resistance performance cannot be stably met, the requirements for raw materials, equipment, and operation level are relatively high, and the increase in converter smelting Burden and other issues, to achieve the effect of reducing production burden, eliminating the adverse effects of carbon increase, and reducing the content of non-metallic inclusions

Inactive Publication Date: 2012-10-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above process only has one RH vacuum refining process, which increases the smelting burden of the converter, reduces the furnace age, and the purity of molten steel is poor. At the same time, the requirements for the LF and RH refining processes are also relatively strict, that is, the raw materials and equipment for each link of the overall metallurgical process , operation level requirements are relatively high, it is more difficult to stabilize production
The control of carbon and sulfur components in the finished steel is unstable, and the acid resistance (resistance to HIC and SCC) cannot be stably up to the standard

Method used

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  • Process for producing anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining
  • Process for producing anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining

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Embodiment 2

[0034] Example 2: A steel plant in northern my country applies the process flow of the present invention to smelt acid-resistant (HIC and SCC) X60 pipeline steel. The specific flow process is: molten iron pre-desulfurization-converter smelting-RH refining (decarburization and deoxidation)-LF refining (heating and desulfurization ) - RH refining (decarburization and degassing) - slab continuous casting - acid-resistant X60 pipeline steel with a thickness of 22.2mm produced by hot rolling, the carbon content of the finished steel is controlled below 0.03%, the sulfur content is less than 0.0008%, and the steel plate is rolled After the tube, it fully meets the requirements of acid resistance test. The comparison of the sampling quality of the pipeline steel pipes in the single vacuum (LF-RH) process and the double vacuum (RH-LF-RH) process is shown in the following table.

[0035] Table 1

[0036]

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Abstract

The invention discloses a process for producing an anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining. In the process, the composition of molten steel is controlled by converter smelting and RH-LF-RH refining process, so as to produce a low-carbon low-sulfur anti-acid (hydrogen-induced cracking HIC and stress corrosion cracking SCC resistant) pipeline steel. The specific flow is as follows: pre-desulphuzation of molten steel - converter smelting-primary RH vacuum refining - LF refining desulphuzation - secondary RH vacuum refining - continuous casting. By the secondary RH vacuum refining process, the decarburization burden of the converter and the oxidability of the molten steel can be reduced, and the adverse effect caused by recarburization in the LF refining process can be eliminated; furthermore, the use of a strong deoxidizer is reduced, the production is stabilized, and the composition of the molten steel is ensured to be controlled within a production target stably to meet the control requirements of the anti-acid pipeline steel on the low-carbon low-sulfur and high-purity composition. The carbon content of the finished steel produced by the process of the invention can be stably controlled to be 0.03% to 0.04%, and the sulfur content is stably controlled to be less 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 components in steel by utilizing converter steelmaking and RH-LF-RH refining. and the tapping temperature, prolong the furnace life of the converter, and give full play to the refining and desulfurization effect of the LF furnace. The RH vacuum secondary treatment eliminates the adverse effect of carbon increase in the LF process, reduces the amount of strong deoxidizer added, reduces the deoxidation inclusions in the steel, and improves the purity. It can meet the requirements of low-carbon, low-sulfur and high-purity component control of acid-resistant (anti-HIC and SCC) pipeline steel. Background technique [0002] Pipeline transportation is the most economical and reasonable transportation method for long-distance transportation of oil and natural gas, and has the characteristics of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/10C21C7/06C21C7/068C21C5/28
Inventor 成泽伟王永胜
Owner UNIV OF SCI & TECH BEIJING
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