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
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[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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