Production method of low-carbon titanium-containing welding rod steel

Abstract

The invention relates to a production method of low-carbon titanium-containing welding rod steel. The steel comprises the following chemical components in percentage by weight: less than or equal to 0.08% of C, less than or equal to 0.03% of Si, 0.40-0.65% of Mn, more than or equal to 0.05% of Ti, less than or equal to 0.020% of P, less than or equal to 0.020% of S and the balance of Fe and inevitable impurities. A molten iron pretreatment + LD + CAS + CC smelting technology is adopted, a molten iron pretreatment + LD + CAS + CC production technology is adopted, and a series of technologies of molten iron pretreatment for S removal, less than or equal to 0.003% of output S, less than or equal to 0.08% of converter terminal C, less than or equal to 0.020% of P, less than or equal to 0.020% of S and more than or equal to 1650 DEG C, alloy and deoxidizer addition in the tapping process, slag charge addition in the tapping process after the converter for slag washing, CAS component fine adjustment, CAS small argon stirring soft blowing and the like are adopted. The problem of castability of molten steel which is smelted by making white slag without entering a ladle furnace is solved, the production cost is reduced, and the finished low-carbon titanium-containing welding rod steel with less than or equal to 0.08% of C, less than or equal to 0.03% of Si, 0.40-0.65% of Mn, more than or equal to 0.05% of Ti, less than or equal to 0.020% of P and less than or equal to 0.020% of S is successfully developed.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a production method of low-carbon titanium-containing welding rod steel. Background technique [0002] In the prior art, molten iron pretreatment + LD + CAS + CC process has been used for welding rod steel production. In order to ensure the pourability of molten steel, the oxygen content in molten steel is controlled at 30-50ppm. [0003] Later, some people developed titanium-containing electrode steel. After adding aluminum to remove oxygen in molten steel, TiFe was added to ensure that the chemical composition met the design requirements, but the pourability of molten steel could not meet the production requirements. For this reason, the ladle furnace was added to make white slag. De-inclusion process. [0004] In order to reduce production costs, metallurgical technicians have made some progress in the production process of low-carbon titanium-containing electrode steel tha...

AI Technical Summary

Problems solved by technology

[0003] Later, someone developed titanium-containing welding rod steel. After adding aluminum to remove oxygen in molten steel, TiFe was added to ensure that the chemical composition met the design requirements, but the castability of molten steel could not meet the production requirements. For this reason, the ladle furnace made white slag De-inclusion process

[0004] In order to reduce production costs, metallurgical technicians have made some progress in the production process of low-carbon titanium-containing electrode steel, but there is still a big gap from the envisaged requirements.