Production method of continuous casting of titanium-containing austenitic stainless steel round tube blanks for seamless steel tubes

Abstract

The invention discloses a continuous casting production method of a titanium-containing austenitic stainless steel round tube blank for a seamless steel tube. The continuous casting production method comprises the specific steps as follows: before AOD steel blending, 5-20kg carburetant per ton of steel is added according to steel tapping components of an electric furnace, and the carbon content is not less than 2.0% at AOD initial stage; AOD is carried out; reduction desulfurization is carried out, silicoferrite is added for reduction, lime and fluorite are added for slag making desulfurization, and after the reduction desulfurization is finished, slag removal is carried out in an AOD furnace; deep deoxidization is carried out; steel tapping and titanium alloying are carried out, after the deep deoxidization is finished, the steel tapping is carried out, and ferrotitanium is added along with a steel flow in a steel tapping process; LF heating is carried out; calcium treatment is carried out, silicon-calcium wires are fed to molten steel by a wire feeding machine, and the feeding quantity of pure calcium is 0.2-0.8kg per ton of steel; soft blowing is carried out; and round blank continuous casting is carried out, after the soft blowing is finished, a steel ladle is moved to a continuous casting station for pouring, and the continuous casting round tube blank is produced by using a round blank crystallizer. With the adoption of the continuous casting production method, sequence casting is realized; the yield is increased; a forging procedure is saved; the production cost is low; and the economic benefits are high.

Description

technical field

[0001] The invention belongs to the technical field of iron and steel smelting in the metallurgical industry, and in particular relates to a production method for continuous casting of titanium-containing austenitic stainless steel round billets for seamless steel pipes. Background technique

[0002] At present, the round tube blanks for large-section (above Φ150) titanium-containing stainless steel seamless steel pipes are produced by forging ingots. The production of round billets for seamless steel pipes by forging die-cast steel ingots has a low yield and high processing costs. If the continuous casting round billet for seamless steel pipe is directly produced by continuous casting process, it will not only increase the yield, but also save forging cost, and greatly reduce the production cost of titanium-containing stainless steel seamless steel pipe.

[0003] Ti is usually added to stainless steel as a stabilizing element to prevent intergranular corros...

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