Low-aluminum high-titanium welding wire steel and smelting method thereof

Abstract

The invention provides low-aluminum high-titanium welding wire steel and a smelting method thereof. The smelting method comprises the following steps that S1, converter tapping deoxidation alloying iscarried out, specifically, high-silicon silicon manganese and high-purity silicon iron are sequentially added for deoxidation alloying during converter tapping, and then lime and fluorite are sequentially added; and S2, LF refining is carried out, specifically, lime and fluorite are added into an LF furnace according to the fluidity of refining slag; calcium carbide and ferrosilicon powder are added in batches for the first time of refining electrification for slag surface deoxidation; sampling and testing are carried out after electrifying is carried out for a period of time, and high-puritysilicon iron and manganese metal are added according to a test result to adjust components to target values; ferrosilicon powder is added to keep the reducibility of refining slag after an alloy is added until refining is finished; and in the later stage of refining, a ferrotitanium wire is fed at a time to enable the titanium content to reach a target value, soft blowing is carried out after sulfur wires are supplemented according to the sulfur content of the test result, and then machine continuous casting is carried out. According to the low-aluminum high-titanium welding wire steel and the smelting method thereof, the components of the low-aluminum high-titanium welding wire steel are stably controlled, meanwhile, the continuous pouring performance of the low-aluminum high-titanium welding wire steel is greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a low-aluminum, high-titanium welding wire steel and a smelting method thereof. Background technique [0002] With the continuous improvement of the quality requirements of steel products by the downstream users of steel production enterprises, the quality requirements of welding wire are also increased. Welding wire steel has very strict requirements on composition, and the smelting control is difficult. Titanium-containing welding steel is added titanium and some other elements on the basis of ordinary welding steel, which can reduce spatter during welding, the weld metal has good plasticity and toughness, the arc is stable and soft, and the weld shape is beautiful. [0003] The higher the titanium content of titanium-containing welding wire steel, the better the welding performance of the welding wire, but the difficulty of smelting also increases,...

AI Technical Summary

Problems solved by technology

[0003] The higher the titanium content of titanium-containing welding wire steel, the better the welding performance of the welding wire, but the difficulty of smelting also increases, especially in the case of low carbon and low aluminum, the main problems in the smelting process are as follows: 1) Low carbon content Control, the addition of alloys in converter tapping and the heating of refining will increase the carbon content of molten steel, and the carbon content of the finished product must be controlled to 0.05-0.07%; 2) Titanium has strong metallic properties, is easily oxidized during the smelting process, and the yield of titanium is low. And unstable, especially in the case of low aluminum control, molten steel only uses silicomanganese deoxidation, it is difficult to control the titanium content stably; 3) Titanium is easily oxidized, and the nozzle and stopper are easy to accumulate titanium oxide inclusions in the continuous casting process material, causing nodules on nozzles and stopper rods, and continuous production is impossible. At present, welding wire steel with a titanium content of 0.20% is mainly produced by die casting, and the castability of continuous casting production is very poor. Generally, it is 2-4 furnaces, and it is difficult to reach 5 stably. above furnace

This method adds rare earth elements, which increases the cost of steelmaking due to the high price. At the same time, the titanium content of the welding wire steel produced by this method is not high, which is 0.15~0.18%. , unable to achieve low aluminum control