Melt type refining synthetic slag heat insulation Refractory Materials Iron and steel smelting
Product introduction and principle
The premelting compound refining slag is a new generation of auxiliary material for steelmaking developed by our company. It is suitable for the refining of molten steel.
Due to the process of smelting, deoxidizing, decarbonizing and alloying, the fresh molten steel inevitably contains a certain degree of impurities.But with the development of production, the varieties of steel and special alloy steel high-quality gradually increase the proportion of the steel grade, from molten steel in continuous casting directly has far cannot satisfy the needs of the quality of rolled products, so how to improve the quality of molten steel has gradually been on the agenda, and major steel mills have started to use AOD and VOD refining technology such as, LF, RD,Among them, LF refining has been gradually promoted and used by many manufacturers because of its low investment and high quality, and the refining slag plays a pivotal role in it.
The main function:
1. It has a strong effect of removing [O], [S] and [P].It can significantly reduce the residual gas in steel.It is very significant to reduce segregation of molten steel, reduce internal defects and prevent subcutaneous bubbles.
2. The interface tension of the steel slag system after refining and refining slag is increased, which is conducive to the separation of steel slag and greatly reduces the number of inclusions.
3. If the residual Al2O3 in the steel is not eliminated, it will not only block the nozzle and worsen the quality of mould protective slag, but also increase the number of inclusions in the casting billet and affect the quality of rolled material.After refining slag into slag, 12CaO.7Al2O3 and Al2O3 have good affinity, easy to adsorb, aggregate and grow up, and easy to float and discharge molten steel. Moreover, it has low oxidation, so it can not only play an effective role in purifying molten steel, but also can effectively avoid the secondary oxidation of molten steel.
Because of its special technology and formula, the purifying effect of premelting compound refining slag is not equal to that of ordinary refining slag.
Analysis of physical and chemical index and effect of refining slag
The main component is CaO-Al-Na2CO3-CaF2-SiO2-MgO aluminum ash used as a reducing agent. Some other basic substances are combined with the reduction products to make slag, and the other part is combined with the residue of deoxidation to make slag, and then separated.
The physical and chemical indicators
From the current situation in the market: the effect of removal [O] is very significant, in the removal [S], the point [S] from 0.02 ~ 0.03% under the lower condition to the point sulfur of 0.0051 ~ 0.0053% effect, desulfurization rate of more than 80%
Use method and steps:
When drawing steel, 4-7kg /T refining slag composite slag is added according to the specific situation of molten steel. Other materials and subsequent steps are carried out in accordance with the general procedures of steel mills