Continuous casting process of steel for high titanium alloy welding rods

Abstract

The invention relates to a continuous casting process of the metallurgy field and discloses a continuous casting process of steel for high titanium alloy welding rods. Full protection pouring is used during continuous casting, and long nozzle argon sealing protection pouring is used from a steel ladle to an intermediate ladle. The whole built-in submersed nozzle protection pouring is used from the intermediate ladle to a crystallizer. A covering agent is used by molten steel in the intermediate ladle. The electromagnetic stirring is used in the process of continuous casting and pouring. Full automation liquid level detection is carried out on the liquid level of the crystallizer. The continuous casting pulling speed is controlled automatically according to the degree of superheat of the intermediate ladle. The degree of superheat of the intermediate ladle in a first continuous casting and pouring furnace is controlled at 30-40 degrees centigrade. The pouring pulling speed is controlled in a range of 1.8-2.4 m / min. The protection slag is composed of the following components measured in percentage by weight: 0.80 + / - 0.15% of R, 35.0 + / - 3.5% of SiO2, 28.0 + / - 3.5% of CaO, less thanor equal to 5.0% of Al2O3, less than or equal to 4.0% of Fe2O3, less than or equal to 5.0% of MgO, 4.5 + / - 1.5% of F<->, 5.0 + / - 2.0% of K2O + Na2O and 12.0 + / - 2.5% of solid C. According to the continuous casting process, the molten steel is prevented from second oxidization in the process of pouring effectively; the stability of titanium in the molten steel is ensured; protection slag is prevented from denaturing; and the quality of the surface of a casting blank is enhanced.

Description

technical field [0001] The invention relates to a continuous casting process in the field of metallurgy, in particular to a continuous casting process of steel for high titanium alloy welding rods. Background technique [0002] Alloy welding wire (bar) steel is used to produce welding materials. With the development of welding technology, the application range of welding materials is expanding day by day, and higher and higher requirements are put forward for the variety and quality of alloy welding wire (bar) steel. . From the perspective of welding material development, gas shielded welding wire has become a trend. This type of wire is usually used for welding with CO 2 For protection, during welding, due to the high temperature heat of the arc, CO 2 The gas decomposes into atomic oxygen, which has strong oxidizing properties, CO 2 It is also an active gas with certain oxidation properties. As a result of the oxidation reaction, a large amount of alloy elements are bu...

AI Technical Summary

Problems solved by technology

[0004] The content of titanium in the steel is high, because Ti is a strong deoxidizer, Ti is easily oxidized during the casting process, and SiO in mold flux 2 reaction, resulting in the denaturation of the mold slag, which sharply increases the alkalinity, melting point, viscosity, and crystallization performance of the mold slag, and deteriorates the mold slag. Slag, scars, slag pits, the surface quality of the slab is poor, the slab with large scars and deep slag pits on the surface is directly rejected, and the slab with a better surface needs to be re-grinded and peeled before rolling, and the cost is high