Casting and Rolling Technology for Ingots from Unkilled and Semilkilled Steel Grades

The developed technology of producing slabs and blooms from unkilled and semikilled steel grades poured into big-end-down mold ensures yield increase up to 1.035-1.050 t/t for blooms, and up to 1.065-1.090 t/t for slabs, depending on the casting method (downhill or uphill casting). Mold life is increased by over than 10%.

The developed technology gives the above-mentioned advantages and, which is important, provides for improvement of the rolled stock macro- and microstructure.

The present technology ensures reduction of the stock discontinuity which results in the development of compacting cracks in the finished product.

The technology includes:

deoxidation technology for the metal poured into the mold;
ingot forming which ensures reduction of defects at its ends during rolling
reduction of the crops standard quantity

At OJSC "Zaporozhstal" the consumption coefficient for carbon and structure steel grades on the slabbing mill (0.8-20 кп/пс) was reduced by 11÷14 kg/t and the increased crops in the roughing mill were reduced by 5÷1 kg/t due to changing the from of the ingot head only, without changing the crops standard quantity.