Knowledge about Steel Production-III

Source: | Author:changxing | Published time: 1879 days ago | 1040 Views | Share:

Knowledge about Steel Production

17. Why is [Si] commonly used in blast furnace production to indicate furnace temperature?
Whether Si is reduced from liquid or gaseous, high temperatures are required. The higher the temperature of the hearth, the more Si is reduced into pig iron. Conversely, the less Si in pig iron. Production statistics show that the furnace temperature (slag iron temperature) is linear with the amount of iron in the pig iron.
Therefore, [Si] is commonly used in blast furnace production to indicate the furnace temperature, and [Si] is synonymous with the temperature of the hearth. Of course, sometimes there is a phenomenon that is not completely consistent, which indicates that the hearth is not working properly and only appears in very few cases.
18. What is the oxidation of molten steel?
Oxygen can be dissolved in the molten steel in a small amount in the atomic state, and the oxygen content of the molten steel at the end of the converter blowing is called the oxidizing property of the molten steel.
19.What are the basic principles for the control of gun positions in converter steelmaking?
According to the specific conditions that occur during the blowing process, the corresponding adjustments should be made in time, and strive to achieve neither “splashing” nor “returning”, which is the smooth end of the smelting process.
20.What metallurgical effects are there in the refining outside the furnace?
(1) Homogenizing the molten steel composition and temperature;
(2) Fine-tuning the ingredients to reduce the chemical composition of the finished steel;
(3) Reducing the sulfur, hydrogen and nitrogen content in the steel;
(4) Changing the morphology and composition of inclusions in steel;
(5) Remove harmful elements in steel and adjust the temperature of molten steel.
21.What is calcium treatment?
Calcium treatment is to add calcium or calcium alloy to steel in different ways to improve steel making process, use for desulfurization, improve inclusion morphology, improve cutting performance, improve transverse mechanical properties along the rolling direction, and improve the flow properties of molten steel.
22.What are the functions of tundish continuous casting?
(1) Reduce the static pressure of the molten steel, keep the stable liquid level of the tundish and smoothly inject the molten steel into the crystallizer;
(2) Promote the inclusion of inclusions in the molten steel;
(3) Diverting molten steel;
(4) Storage of molten steel to achieve continuous casting with many furnaces.

Prev： Brief intr......

Next： Knowledge ......