Abstract：To obtain the ultra- low carbon steel with the proper BH value，the solute carbon mass fraction must be controlled during the production of the baking hardened steel. The process control technologies of the narrow component control of the solute carbon mass fraction（±0.000 3%）in the development process of the ultra- low carbon steel in Shougang Jingtang Company were introduced. The key measures for the stability control of the solute carbon included controlling the decarburization time during the refining process to control the carbon mass fraction at the end of refining，adjusting the alloy mass fraction in steel by using the low carbon ferroalloys to make the recarburization in a range of 0.000 1%~0.000 2%，and using the low carbon（w(［C］)≤0.5%）refractory materials to control the recarburization in tundish. After all the actions taken, the stability of the carbon mass fraction in tundish was greatly improved，and the hit- rate of the solute carbon with the deviation of ±0.000 3% increased from 66% to 81%.
2017, Vol. 27 
