Control method for steel tapping slag condition of high-carbon and high-alloy steel 90t converter

Abstract

The invention discloses a control method for the steel tapping slag condition of a high-carbon and high-alloy steel 90t converter. The control method comprises the following steps that (1) during steel tapping alloying, a deoxidizing agent, slag charge, carbon powder, alloy and slag charge are added in sequence; (2) alloy baking is performed, specifically, the alloy is added into an alloy baking furnace to be baked in advance before converter smelting, it is guaranteed that the alloy becomes red during steel tapping, and the alloy temperature is 400+/-50 DEG C; (3) steel tapping slag charge is processed, specifically, the alloy and the slag charge are added in batches according to different time periods; the amount of slag added in the steel tapping process is 4.5 kg/t-5.0 kg/t; (4) bottom blowing system control of a steel tapping steel ladle is performed, specifically, at least two bottom blowing ventilation chambers are opened in the steel tapping process, and bottom blowing is conducted through the single ventilation chamber after steel tapping is finished; and (5) the slag charge is supplemented when the temperature is increased to 1520-1550 DEG C after LF refined molten steel arrives at the station, and the dosage of the slag charge is 4.0 kg/t-4.5 kg/t. According to the method, fluorite does not need to be added for slagging, the dosage of a slagging agent and the power consumption are reduced, the refining time is shortened, and meanwhile, the cost is saved.

Description

Technical field [0001] The present invention relates to the field of a steelmaking process in the steel industry, particularly to high carbon, high alloy steel 90t illustrating a control method of the converter slag conditions. Background technique [0002] In the production of carbon converter (≤ 0.60% [C] ≤1.00%) and a high alloy steel species (the amount of the steel alloy 1.5t ~ 2.5t / furnace), after tapping the need to add a lot of toner, the slag materials alloy, the steel slag surface mostly there is a large clinker (clinker diameter greater than 50cm) and alloys deposited slag, (big clinker and slag material deposited alloy at 80% probability of occurrence). Further, the ladle bottom-blowing agitation large influence on the slag, smelting ladle bottom blowing single hole, stirring efficiency is poor, there is a dead molten steel surface, slag poor flow, leading to poor wash slag, steel slag level in the alloy materials the accumulation of intractable. LF furnace molten s...

AI Technical Summary

Problems solved by technology

In addition, the bottom blowing and stirring of the ladle has a great influence on the slag. During smelting, the ladle is single-hole bottom blowing, the stirring efficiency is poor, there is a dead angle on the liquid steel surface, and the slag flow is poor, resulting in poor slag washing effect. can't be piled up

After the LF furnace molten steel enters the station, due to the accumulation of a large amount of slag and alloy on the slag surface in the ladle, the slag crust is serious, which makes it difficult to raise the temperature during LF refining. The increase in the amount of stone will increase the cost and erode the furnace lining; the large slag formed by the slag has poor desulfurization effect, and a large amount of lime needs to be added in the refining process, and the bottom blowing large flow rate is stirred for desulfurization, which leads to serious secondary oxidation of molten steel and affects the yield of the alloy.