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Some knowledge of steel production

Mold reverse taper


(upper mouth width - lower mouth width) / (upper mouth width x mold length) * 100%, the value is 1.1%/m-1.7%/m, the value of the value is related to the solidification characteristics of the steel grade and the section of the slab, generally For large sections, the taper of the mold takes a small value, and for a small section, the taper of the mold takes a large value.


Crystallizer Cooling Strength


The heat transferred from molten steel to water through the same plate per unit time, and the cooling intensity is related to the thickness of the wear-resistant layer of the copper tube of the mold, the amount of cooling water and the steel type: Q=0.0036F*VF: the total area of ​​the mold water joint; V: The flow rate of cooling water in the water gap.


Calculation formula of spill rate of casting machine


The sum of the number of overflow steel flows/(the total number of pouring furnaces * the number of flows owned by the casting machine) * 100%. It is an important indicator to measure the full-flow operation rate of continuous casting. The best data for the leakage rate of domestic steel mills is 0.001% for billets, 0.002% for the leakage rate of rectangular billets, and 0.005% for the leakage rate of slabs.


Shrinkage of strand wire


Refers to the longitudinal shrinkage of the slab during the cooling process. It is mainly related to cooling and carbon content. Different steel grades have different linear shrinkage. For example, C0.10%, linear shrinkage is 10.5%; C0.40%, linear shrinkage is 11.3%; C0.70%, linear shrinkage is 12.1%. ; C1.00%, line shrinkage 14.0%. Calculation formula: Δl=βΔTΔT—the temperature change of the shell from the meniscus to the outlet of the mold;


β—Shrinkage coefficient of shell, ferrite is 16.5×10-6/℃; austenite is 22.0×10-6/℃