Abstract
The heats established that, using the normal steelmaking practice for arc furnaces (with oxidizing and reducing periods), the nitrogen content of low-alloy welding steel fluctuated from 0.0132 to 0.0180%,* which considerably exceeds the norm (GOST 2246-70). It was determined that 55% of the total nitrogen in the steel was introduced by the charge, 28.5% was from the furnace atmosphere, 12.5% entered from the air during tapping and teeming, and 4% was introduced by ferroalloys and coke fines. The greatest increase in the nitrogen content of the steelmaking occurs during the reducing period, and a substantial portion of the total nitrogen is introduced during tapping and teeming. Figure 1 shows a cu~Te of the change in nitrogen content over time, averaged for six heats.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call